Home Battery Quote Checklist: Backup Loads and Sign-Off

The homeowner asks for a battery that will “keep the whole house running.”

One proposal says:

Install one 13.5 kWh home battery with backup gateway — complete.

That line names a product size. It does not define a backup system.

It does not say whether 13.5 kWh is nominal or usable energy, how much reserve the control settings preserve, how much continuous or peak power the system can deliver, or which motors can start. It does not say whether the home has solar, whether solar can recharge the battery while islanded, whether the battery may charge from the grid, or what happens when a virtual-power-plant event lowers its state of charge before an outage.

It also leaves the service equipment, panel arrangement, fire and building review, installation location, utility interconnection, communications, commissioning, warranty, incentive, and end-of-life responsibilities unresolved.

A useful solar and storage proposal turns “backup” into a testable scope. It connects the customer's goal to the supported loads, power and duration model, exact listed equipment, operating modes, site and code conditions, utility rules, installation work, commissioning results, owner training, and signed approval notes.

Use Documentorium to turn that promise into a sequence the homeowner can follow. Record the service, panels, existing solar, proposed location, communications, and customer priorities in the site assessment checklist and electrical inspection report. Put the selected equipment, backed-up loads, kW and kWh assumptions, work packages, exclusions, allowances, and options in the solar quote, with the longer design and interconnection boundaries in the scope attachment. If a service or panel change is possible, the panel-upgrade quote guide shows what belongs in that decision. If an incentive is discussed, use the rebate paperwork guide to separate the installer's paperwork task from a promise that the customer will qualify or be paid.

The quote should answer four questions before it asks for a signature:

1. What problem is this system designed to solve?
2. Under what stated conditions is it expected to solve it?
3. What work and approvals are included to make that operating mode possible?
4. What is not promised?

Classify the customer's goal before selecting equipment

Battery storage can serve different goals. Rank them instead of treating them as automatic features of one box.

The customer may want more than one goal, but the controls can compete. Reserving more energy for an outage can reduce time-of-use savings. Allowing a grid program to dispatch the battery can reduce the energy available at a particular moment unless the program and settings protect an agreed reserve. Charging from the grid may affect tariff, incentive, or environmental claims. Maximizing daily cycling can affect degradation and warranty throughput.

Record a priority order:

Priority 1: backup for the well pump, refrigerator, selected lighting, communications, and one heating-system circuit. Priority 2: solar self-consumption. Priority 3: optional grid-services enrollment only after customer reviews dispatch, reserve, compensation, privacy, and opt-out terms. No financial or outage-duration guarantee is included.

That statement is a design input, not a prediction.

Separate kW, kWh, and hours

Battery proposals fail when three different measures are treated as one.

Power in kilowatts

Power is how much load the system can supply at a moment. Record:

• continuous AC output under the proposed configuration;
• short-duration or peak output and its duration;
• per-phase or other configuration limits where relevant;
• operating-temperature or altitude derating;
• inverter and gateway limits;
• number of battery units and whether outputs aggregate as assumed;
• grid-connected versus island-mode limits; and
• the largest motor, compressor, pump, heating element, or other load expected to start.

A battery with enough stored energy can still trip off if an instantaneous load or motor start exceeds its power capability.

Energy in kilowatt-hours

Energy is the amount stored or delivered over time. Distinguish:

• nominal nameplate energy;
• usable energy available under manufacturer controls;
• customer-set backup reserve;
• minimum protected state of charge;
• expected conversion and standby losses;
• capacity degradation assumption;
• temperature effect;
• energy committed or accessible to a grid program; and
• the energy actually available at the moment an outage begins.

Do not advertise nominal kWh as guaranteed delivered AC energy.

Duration in hours

Duration depends on changing loads and recharge, not the battery label alone.

For each scenario, show the model. A simple first pass is:

Available AC energy ≈ rated usable capacity (kWh) × remaining-capacity factor × available state-of-charge window × modeled conversion efficiency.

The usable state-of-charge window is the starting state minus the protected reserve: an 80% starting state and a 20% reserve leave a 60% window. Use those percentages as decimals in the calculation. If the starting state is at or below the reserve, available energy above reserve is zero. Apply temperature and standby-loss assumptions separately when they matter. If the starting figure already reflects measured or manufacturer-adjusted current capacity, do not subtract degradation a second time. Then compare the result with the changing load profile and model solar recharge separately.

Use ranges and scenarios rather than false precision:

The blanks prevent a generic example from becoming a customer promise. Populate the quote from the actual system, load record, site, manufacturer data, and design.

List the backup loads circuit by circuit

“Critical loads” is common shorthand. It can falsely suggest a code classification or a promise about human safety.

Call the customer-selected list an “essential-load schedule” unless the actual project has legally required emergency, legally required standby, healthcare, fire-protection, or other classified loads.

For each proposed backup load, capture:

• stable load ID;
• equipment or circuit description and location;
• voltage, phase, breaker, conductor, and observed panel location;
• nameplate input and measured or documented operating demand where appropriate;
• continuous, intermittent, thermostatic, variable, or motor behavior;
• starting current or manufacturer starting data where material;
• duty cycle and seasonal pattern;
• customer priority: highest priority, preferred, or excluded;
• manual operating restriction during an outage;
• whether automatic load shedding is included;
• communications or control dependency;
• transfer path and backed-up distribution equipment; and
• known maintenance or existing-condition issue.

Common candidates require more detail than their circuit label suggests:

• refrigerator and freezer cycling;
• well or booster-pump starting and controls;
• sump pump, alarm, and discharge condition;
• furnace blower, boiler controls, heat pump, auxiliary heat, and thermostat;
• septic pump or lift station;
• garage door opener and manual release;
• internet, security, gate, and communications equipment;
• medical equipment, for which the customer should confirm requirements with the equipment provider and maintain a separate emergency plan—the battery quote is not a life-safety guarantee;
• cooking, water heating, dryer, EV charging, pool, spa, sauna, and resistance heat; and
• solar, generator, or another power source.

Identify excluded loads explicitly. A useful approval note is:

Battery backup serves only the circuits listed in Essential-Load Schedule E-1. Electric range, clothes dryer, EV charger, pool equipment, central air-conditioning compressor, electric water heater, shop equipment, and all unlabeled future loads are excluded unless expressly added by approved design revision. Customer agrees to follow the outage operating sequence in the handoff guide.

If the customer requests service-level or “whole-home” backup, the quote must still list system limits, load management, incompatible combinations, and manual restrictions. A service-size gateway does not prove the battery can run every connected load simultaneously.

Survey the existing electrical and solar system

Do not quote final storage scope from a utility bill and a photo of the proposed wall.

Use a site assessment and electrical inspection report to document:

• service voltage, phase, rating, service point, meter, and serving utility;
• service disconnect, main distribution, subpanels, bus and breaker ratings, directories, and available spaces;
• existing loads and known future electrification plans;
• grounding and bonding configuration to be verified in design;
• available fault-current or utility information required for equipment selection;
• solar array, inverter, optimizer, rapid-shutdown, production meter, interconnection agreement, export setting, and ownership arrangement;
• generator, transfer equipment, EV supply equipment, power-control system, surge protection, and other sources;
• customer-owned versus leased or third-party-owned equipment;
• manufacturer, model, serial, firmware, commissioning account, and warranty status for equipment affected by the retrofit;
• visible damage, overheating, corrosion, water, unlisted alterations, recalled equipment, or blocked working space;
• conductor and communications routes;
• internet, cellular, Wi-Fi, or hardwired communications availability;
• installation surfaces, structural support, vehicle exposure, weather, drainage, flood, snow, salt, wildfire, temperature, and ventilation conditions; and
• access for installation, inspection, service, emergency response, and eventual removal.

Record unverified areas. “Existing solar system compatible” should never be an unsupported estimate assumption.

For an existing PV system, determine whether storage will be:

• AC-coupled with its own power conversion;
• DC-coupled through compatible solar/storage equipment;
• added through a manufacturer-approved expansion path;
• installed as a separate backup system without solar recharge during an outage; or
• part of a larger replacement or repower scope.

The choice affects equipment compatibility, clipping and conversion losses, outage recharge, controls, warranties, permits, utility review, rapid shutdown, and commissioning. Describe the actual architecture after design.

Name the exact system, not a basket of components

The quote should identify the proposed energy storage system as a coordinated assembly.

Record:

• system manufacturer and product family;
• exact battery, power-conversion, gateway, transfer, disconnect, control, and accessory models;
• quantity and permitted grouping;
• nominal and usable energy;
• continuous and peak output for the selected configuration;
• voltage, phase, current, and enclosure/environmental ratings;
• battery chemistry represented by the manufacturer;
• communication hardware and required subscription;
• included current transformers, meters, controllers, load-management devices, and sensors;
• compatible solar inverter or generator requirements;
• approved conductors, raceways, overcurrent protection, disconnects, and labels shown in design;
• expansion limits and whether later expansion requires matched hardware or firmware;
• warranty and expected service channel; and
• listing and test evidence reviewed for the exact configuration.

Do not present a battery model, third-party inverter, site-built controller, and transfer device as a UL 9540-listed system merely because individual components carry unrelated certifications.

Know what UL 9540, UL 9540A, and UL 9540B actually mean

UL Solutions describes UL 9540 as the safety standard for energy storage systems and equipment. It evaluates the coordinated system, drawing on component standards such as UL 1973 for stationary batteries and UL 1741 for power-conversion and interconnection equipment where applicable.

UL 9540A is different. It is the test method for evaluating thermal-runaway fire propagation in battery energy storage systems. Testing can progress through cell, module, unit, and installation levels, as applicable. A UL 9540A test report can inform code-required separation, maximum quantities, fire and explosion protection, or alternative installation conditions.

UL 9540B is an Outline of Investigation for a large-scale fire test of residential battery energy storage systems with a rated energy capacity of 20 kWh or less. It addresses a different question: fire propagation and the thermal effect on nearby exposures when vented gases are deliberately ignited. UL says some code authorities request that additional evidence because they do not treat UL 9540A alone as the large-scale residential fire test required by their local code. UL 9540B does not replace system certification under UL 9540 or thermal-runaway testing under UL 9540A.

Record the exact test method and edition the AHJ requests, the models and configuration the report covers, and whether the proposed installation matches the report's spacing, mounting, enclosure, protection, and exposure conditions. A report bearing the right number but covering the wrong configuration is not useful approval evidence.

Do not write:

• “UL 9540A-certified battery” without verifying what the test and certification record actually say;
• “passed UL 9540A, therefore it can go anywhere”;
• “UL 1973 battery means the assembled installation is UL 9540 listed”;
• “UL 9540B report means every residential location and spacing is approved”;
• “tested system” when the report covers a different cell, module, enclosure, firmware, spacing, quantity, or configuration; or
• “fireproof” or “cannot experience thermal runaway.”

For the proposed configuration, retain:

• listing agency and listing category;
• certification record or product identifier;
• exact system models and permitted combinations;
• installation manual revision;
• UL 9540A report or summary required by the AHJ;
• tested unit arrangement, state of charge, spacing, mounting, enclosure, detection, ventilation, and protection assumptions material to approval;
• manufacturer technical bulletin supporting any reduced separation or special condition; and
• AHJ acceptance or approved plan reference.

Listing is one input. The adopted code, listing conditions, manufacturer instructions, approved plans, site conditions, utility rules, and qualified installation still control the project.

Use the locally adopted codes, not the newest edition by default

The latest national model standards are not automatically enforceable in every jurisdiction.

The 2026 edition of NFPA 70, the National Electrical Code, includes Article 706 for energy storage systems and related requirements across articles governing interconnected sources, solar PV, stand-alone systems, optional standby systems, wiring, overcurrent protection, grounding and bonding, disconnects, power-control systems, and labels. NFPA 855, 2026 edition, addresses stationary energy storage installation, including commissioning, operation and maintenance, decommissioning, electrochemical systems, and a chapter for one- and two-family dwellings and townhouse units.

The 2024 International Residential Code, a model code, includes Section R330 for energy storage systems. Section R330.2 generally requires an ESS to be listed and labeled to UL 9540, subject to the section's exceptions. Section R330 also addresses installation, spacing, locations, protection, and other residential conditions.

The project may be governed by earlier editions, state amendments, a local fire code, utility standards, or a specific permit bulletin. The AHJ decides how the adopted requirements apply.

The quote should state:

Do not promise a garage, basement, exterior wall, attic, closet, habitable-space, or utility-room location from sales preference alone. Validate the location against the listing, manufacturer instructions, unit size and grouping, openings and egress, impact protection, environmental limits, structural support, fire-resistance and separation rules, local amendments, and AHJ interpretation.

Turn the proposed location into a real scope

For each battery, gateway, inverter, disconnect, controller, and backed-up panel, show:

• scaled or dimensioned proposed location;
• wall, floor, pad, rack, or mounting construction;
• attachment and structural assumptions;
• separation from other units and relevant building features;
• doors, windows, vents, ignition sources, appliances, habitable rooms, sleeping rooms, egress paths, and property lines as applicable;
• vehicle-impact protection in garages or drive paths;
• flood elevation, drainage, snow, ice, direct sun, temperature, salt, wildfire, and weather exposure;
• service and replacement clearances;
• working space and emergency access;
• bollards, curbs, enclosures, guards, barriers, signage, or detection included;
• conduit, cable, communications, and sensor routes;
• penetrations, firestopping, sealing, flashing, and finish repair;
• demolition and disposal; and
• landscaping, paving, drywall, paint, masonry, roofing, or other restoration boundaries.

Avoid a vague exclusion such as “carpentry by owner” when the system cannot be installed without a rated wall, structural backing, or protected route. Identify the prerequisite, drawing, responsible party, inspection, and schedule gate.

A fixed-price location note can read:

Price is based on exterior Wall W-02 at the dimensions shown on Drawing E-2, using the listed wall-mount configuration and clearances identified in manufacturer instruction revision ____. Location remains subject to structural verification, utility and AHJ approval, listed environmental limits, and confirmation that no concealed service, drainage, gas, or structural conflict exists. Relocation, freestanding support, bollards, fire-resistance work, drainage work, or extended raceway requires a written change.

Define the backed-up distribution and isolation method

A grid-connected battery cannot simply energize the house and utility lines during an outage.

The design needs listed, approved equipment and controls that detect loss of utility, isolate the intended island, energize only the approved distribution, coordinate solar and other sources, and reconnect under required conditions.

The quote should identify:

• service-level, feeder-level, or branch-circuit backup arrangement;
• gateway or transfer equipment;
• service-equipment and disconnect changes;
• backed-up loads panel or existing distribution changes;
• neutral, grounding, and bonding design basis shown on the approved one-line;
• load-shed relays, smart breakers, contactors, or power-control functions;
• PV connection and island behavior;
• generator connection and manufacturer-supported operating sequence, if any;
• EV, HVAC, water-heating, pool, or other controlled loads;
• utility-visible disconnect or metering changes;
• emergency shutdown and rapid-shutdown interaction where applicable;
• fail-safe behavior after loss of communication or control power; and
• labeling and directories.

The generator and transfer-switch quote guide covers the other side of a hybrid backup design. If a generator is present or proposed, state whether the sources can operate together, which controller has priority, what transfer and isolation sequence is supported, and which loads or charging modes are blocked in each state.

DOE explains that a properly configured solar-plus-storage system can detect a grid outage and operate in an islanded mode. That does not mean any existing grid-tied solar array will power a house when the grid is down. The quote must name the equipment and configuration that creates the island and state whether PV can recharge storage during that mode.

Use an operating-mode schedule

The customer should approve how the system is intended to behave, not merely the hardware.

Name the control hierarchy. A utility program, manufacturer cloud service, installer account, aggregator, homeowner app, and local controller may all have different permissions.

State what requires internet access and what continues locally when internet or cloud service is unavailable. State who owns the account, who receives alerts, who may change reserve or export settings, and how access transfers when the house is sold.

Model savings from the actual tariff and interval data

Do not sell storage with a universal monthly-savings percentage.

A reasonable estimate should identify:

• serving utility and exact current rate or tariff;
• at least a representative billing history and interval data when available;
• fixed charges that storage does not eliminate;
• import prices by time;
• export compensation by interval or season;
• demand charges if applicable;
• solar production model and degradation if paired with PV;
• battery usable capacity, efficiency, reserve, degradation, and dispatch assumptions;
• grid-services revenue assumptions and program term;
• escalation assumptions and source;
• financing cost, fees, and ownership structure shown separately; and
• the difference between modeled savings and guaranteed performance.

California's Net Billing Tariff is a good example of why the exact rate matters. For customers on that tariff in PG&E, SCE, or SDG&E territory, the CPUC says export credits reflect the value of generation to the grid rather than the ordinary retail rate; values vary by time, and storage can shift energy toward higher-value hours. That does not prove a particular battery will save a particular customer a stated amount.

For a California quote, identify whether the account is on the Net Billing Tariff, an earlier NEM tariff, another utility tariff, or a publicly owned utility program. Record the interconnection application date, existing system status, proposed storage operating mode, export treatment, and utility-confirmed requirements. Do not use NEM 3.0 as a substitute for the actual tariff and utility documents.

SEIA's current consumer-protection standard emphasizes trained sales practices and clear treatment of system operation, warranties, lifespan, storage capacity, monitoring, grid-services enrollment, financial estimates, and transaction terms. The practical rule is to make the material assumptions as visible as the sales claim.

Do not promise an expired federal residential credit

Current IRS guidance says the federal Residential Clean Energy Credit under section 25D is not available for property placed in service after December 31, 2025. The IRS termination FAQ adds that paying by the deadline is not enough when the original installation is completed later. A home battery whose original installation is completed in 2026 should not be advertised as eligible for that expired residential credit.

Other credits may apply to a business, nonprofit, government, rental, or other ownership structure, but those are different taxpayers and rules. A residential contractor should not turn a commercial clean-electricity credit into a homeowner promise.

Use a program-specific incentive schedule:

California's Self-Generation Incentive Program illustrates the need for exact program work. The CPUC currently describes incentives for qualifying distributed energy systems and a residential solar-and-storage equity path for eligible low-income customers. Budgets, eligibility, approved developers, sizing, demand-response enrollment, reservation, documentation, installation, inspection, and payment conditions matter.

Do not subtract an SGIP amount from the contract price as guaranteed cash unless the governing program and financing structure actually support that treatment. State whether the installer submits the application, whether funds are reserved, what the customer must provide, who receives payment, what happens on a waitlist or denial, and who pays if the project is completed without the expected incentive.

Make utility interconnection a named work package

Storage can change generation export, service configuration, protection, metering, operating modes, and an existing interconnection agreement.

The quote should state:

• serving utility and account holder;
• existing generation agreement and tariff;
• new, modification, non-export, export-limited, or other application path;
• proposed power and energy ratings;
• exact inverter and storage equipment;
• single-line diagram and site plan responsibility;
• control and export-setting documentation;
• utility disconnect, meter, transformer, service, communication, or study requirement;
• application, engineering, inspection, witness test, and permission-to-operate steps;
• utility and third-party fees;
• whether equipment may be installed before approval;
• whether it may be energized or operated before permission;
• expected lead time stated as an assumption, not a utility guarantee; and
• the change process if the utility requires redesign.

Do not promise that “non-export” means no utility review. Do not assume adding a battery preserves an existing solar tariff. Obtain the current utility determination for the actual configuration.

Price the job in auditable work packages

A customer should be able to see why two battery quotes with the same product have different totals.

Break the quote estimate into:

1. assessment, load study, and design;
2. permit drawings, engineering, and AHJ fees;
3. utility application and interconnection work;
4. battery units and required accessories;
5. inverter, gateway, transfer, controls, metering, and communications;
6. backed-up distribution, breakers, load control, and panel work;
7. service, meter, grounding, bonding, surge, and disconnect work;
8. mounting, pad, bollards, barriers, structural backing, and weather protection;
9. raceways, conductors, trenches, penetrations, firestopping, and restoration;
10. solar modification or new PV work;
11. generator or other-source integration;
12. shipping, storage, lifting, hazardous-material handling, and equipment disposal;
13. startup, commissioning, controlled outage test, and customer training;
14. monitoring setup, subscription, and grid-program enrollment;
15. incentive administration; and
16. closeout, warranty registration, and decommissioning information.

Show allowances and exclusions separately. Do not bury an unknown service upgrade, utility transformer charge, fire-rated construction, cellular subscription, or drywall repair inside “miscellaneous electrical.”

Put the commercial and ownership terms beside the system

State whether the customer:

• purchases the equipment for cash;
• uses a separately identified loan;
• leases equipment;
• enters a power-purchase, grid-services, or shared-savings arrangement;
• grants a security interest or property-related assessment;
• transfers renewable or grid-service attributes; or
• allows remote control or data access.

If financing is offered, show the cash price separately and identify the lender and the documents that control the financing. Do not fold dealer fees, payment schedules, prepayment terms, or lien and security consequences into a vague monthly-payment pitch; have the finance provider or counsel confirm the disclosures required for that transaction.

Do not represent the contractor as the government, utility, CPUC, or program administrator. The FTC advises clean-energy sellers to disclose total cost and financing clearly and not overpromise savings, credits, rebates, or incentives.

Provide the complete agreement before signature. If the FTC Cooling-Off Rule or a state home-improvement, deposit, financing, electronic-signature, or cancellation rule applies, provide the required notices and forms and use the correct deadline. Do not assume every sale has the same cancellation period.

Define change-order triggers before equipment is ordered

Use a written change order when the approved basis changes, including:

• customer adds or reprioritizes loads;
• measured or nameplate load differs from the survey;
• existing solar, service, panel, grounding, or other-source configuration differs;
• selected equipment becomes unavailable or loses required compatibility;
• manufacturer changes an approved configuration or firmware dependency;
• AHJ requires different spacing, protection, listing evidence, engineering, or location;
• utility changes the interconnection method, export setting, metering, service, transformer, or study;
• concealed structure, water, fire damage, asbestos, lead, corrosion, gas, plumbing, or another conflict appears;
• proposed mounting surface or route is unsuitable;
• communications are inadequate;
• customer requests generator integration, whole-home backup, added solar, or grid services;
• incentive eligibility or reservation assumptions change; or
• schedule, freight, storage, remobilization, or restoration changes materially.

Stop the affected purchasing or installation work before approval. A battery substitution is not just a brand swap; it can change the system listing, UL 9540A evidence, power, energy, controls, tariff, permit, warranty, and commissioning.

Give the crew an approved work order

The solar work order should carry the final design, not the salesperson's initial sketch.

When the customer approves the system, move the exact equipment, operating modes, responsibilities, payment terms, and change process into the solar contract. Use the electrical work order for the circuit and panel tasks, and issue the warranty and completion sign-off with commissioning results and open utility or monitoring items. The EV-charger intake guide is also a useful model for asking about large loads before promising backup behavior.

Include:

• approved quote, change, permit, and utility revision IDs;
• equipment models, quantities, serial-capture fields, and listing evidence;
• one-line, site plan, mounting detail, backed-up-load schedule, and labels;
• shutdown, isolation, lockout/tagout, stored-energy, lifting, electrical, arc-flash, fall, drilling, fire, heat, and battery-handling controls appropriate to the work;
• delivery inspection and damaged-product quarantine;
• manufacturer instructions and torque/specification records;
• raceway, conductor, overcurrent, grounding, bonding, communications, and control tasks;
• battery state-of-charge and commissioning prerequisites;
• utility, inspector, engineer, and customer hold points;
• energization authority;
• commissioning test sequence;
• photo and measurement requirements;
• customer-account and privacy boundary; and
• removed equipment, packaging, damaged battery, and waste handling.

Battery equipment can retain hazardous energy after normal sources are disconnected. Field procedures must follow the system instructions, employer safety program, adopted requirements, and qualified-person boundaries. A customer signature cannot waive those controls.

Commission the promised operating modes

“App connected” is not a commissioning record.

Record, as applicable:

• equipment model, serial, hardware, firmware, and configuration;
• permit and utility release status;
• visual and mechanical inspection;
• conductor, overcurrent, disconnect, grounding, bonding, and label verification;
• communication and meter orientation;
• control, export, reserve, tariff, and load-management settings;
• battery state of charge and environmental conditions;
• grid-connected charge and discharge;
• controlled loss-of-grid detection and isolation;
• energization of only the approved backed-up distribution;
• operation of each essential load and tested load combination;
• motor-start or load-shed behavior;
• solar operation and recharge while islanded, if promised and testable;
• generator interaction, if included;
• restoration and reconnection sequence;
• emergency stop or shutdown functions;
• alarm, notification, monitoring, and loss-of-communications behavior;
• utility witness or export test where required;
• unresolved deviations; and
• identities and qualifications of the commissioning and witnessing parties.

Do not create an uncontrolled utility outage. Coordinate the test under the approved procedure, utility and AHJ requirements, manufacturer instructions, and customer safety plan.

A pass/fail record should cite the acceptance basis. “Backup test passed” is too thin if the quoted system promised to start a well pump, shed the EV charger, preserve 30 percent reserve, and recharge from solar.

Hand off limitations, emergency information, and ownership

The closeout packet should include:

• accepted proposal, contract, change orders, and final invoice;
• approved plans, permits, inspections, and utility permission;
• final one-line, site plan, equipment schedule, and load schedule;
• model, serial, listing, installation, and warranty records;
• commissioning and controlled-outage test results;
• directories, labels, photos, and as-configured settings;
• backup-load and manual operating instructions;
• normal, storm, outage, maintenance, and shutdown modes;
• app, local-control, cloud, monitoring, and subscription information;
• account ownership and installer-access permissions;
• grid-services terms and enrollment status;
• maintenance and capacity-check schedule;
• emergency contact and responder information supplied by the manufacturer or AHJ;
• signs of damage, abnormal heat, odor, sound, smoke, swelling, leakage, alarm, or fault that require evacuation or professional response;
• prohibition on homeowner opening, modifying, moving, or bypassing the system;
• warranty providers and service process;
• future-load and expansion restrictions;
• property-insurance and sale/transfer reminders; and
• decommissioning, recycling, transport, and removal contacts.

EPA advises that medium- and large-scale lithium-ion batteries should not enter household trash or municipal recycling and recommends contacting the manufacturer, dealer, or installer for management options. PHMSA regulates lithium-battery transport and applies stricter handling to damaged, defective, or recalled batteries.

Do not tell a homeowner to disconnect, package, or transport a damaged home battery. Establish the manufacturer and qualified-response process in advance.

Customer approval notes that deserve initials

Use a one-page approval schedule for material decisions:

• [ ] Primary system goal and priority order.
• [ ] Essential loads included and loads excluded.
• [ ] Continuous and peak power limits.
• [ ] Nominal and usable energy, reserve, and degradation basis.
• [ ] Outage-duration scenarios and assumptions—not a guarantee.
• [ ] Solar recharge capability while islanded.
• [ ] Battery and gateway location.
• [ ] Normal, outage, storm, grid-services, and maintenance modes.
• [ ] Utility tariff, export, and interconnection assumptions.
• [ ] Monitoring, cloud, subscription, remote-control, and privacy terms.
• [ ] Equipment ownership, financing, and security or property consequences.
• [ ] Incentive application responsibility and denial risk.
• [ ] Manufacturer and workmanship warranty boundaries.
• [ ] Permit, utility, structural, restoration, and other-trade responsibilities.
• [ ] Change-order triggers.
• [ ] Emergency, service, future expansion, and end-of-life boundaries.

Initials do not replace the full contract, required disclosures, or informed consent. They make the highest-risk choices harder to bury.

Sources

Sources were checked on August 21, 2026, against the official standards-owner and government pages available at the time. NFPA listed the 2026 editions of NFPA 70 and NFPA 855; UL distinguished UL 9540 system certification from UL 9540A thermal-runaway testing and the residential UL 9540B large-scale fire-test outline; SEIA listed SEIA 401's current version as 2025; and IRS guidance confirmed that section 25D is unavailable for property placed in service after December 31, 2025, with expenditure timing tied to completion of the original installation. Tariffs, incentive budgets, test editions, adopted codes, and local acceptance can change, so re-check the actual project before quoting.

• NFPA 70 — National Electrical Code, 2026 Edition
• NFPA 855 — Standard for the Installation of Stationary Energy Storage Systems, 2026 Edition
• 2024 International Residential Code — Section R330, Energy Storage Systems
• UL Solutions — Energy Storage System Resources for Code Authorities
• UL Solutions — Energy Storage System Testing and Certification
• UL Solutions — Safety Testing for Residential Energy Storage Systems and UL 9540B
• SEIA 401 — Solar and Energy Storage Consumer Protection Standard, Current Version 2025
• Federal Trade Commission — Cooling-Off Period for Sales Made at Home or Other Locations
• U.S. Department of Energy — Solar and Resilience Basics
• U.S. Department of Energy — Solar-Plus-Storage 101
• California Public Utilities Commission — Net Energy Metering and Net Billing
• California Public Utilities Commission — Net Billing Tariff Proceeding and Decision
• California Public Utilities Commission — Self-Generation Incentive Program
• Internal Revenue Service — Residential Clean Energy Credit
• Internal Revenue Service — 2025 Energy Credit Termination FAQ
• Federal Trade Commission — Solar and Clean-Energy Sales Claims
• U.S. Environmental Protection Agency — Used Lithium-Ion Batteries
• Pipeline and Hazardous Materials Safety Administration — Transporting Lithium Batteries

This article is a quote and documentation framework, not a substitute for project-specific design, code and fire review, utility approval, or tax, legal, financial, safety, environmental, and emergency-response advice. For every job, verify the adopted codes and amendments, listing and test evidence, manufacturer instructions, AHJ and utility requirements, licensing, tariff and program status, safety procedures, warranty, property conditions, and customer-specific load data.