How to quote home battery storage installations

Knowing how to quote home battery storage clearly is becoming essential for solar and electrical installers. More homeowners are asking about batteries, whether alongside new solar panels, added to an existing system, or on their own to make use of cheaper overnight electricity. They often don’t know what size they need or what it will do for them, so a clear quote builds trust.

The questions that shape a battery quote

Do they have solar already? If so, what size system, what inverter, and how old?
What do they want the battery for? Storing daytime solar, charging on a cheaper overnight tariff, backup during power cuts, or a mix.
How much electricity do they use, and when? Evening use matters most.
Plans: an EV, heat pump or more panels in future?
Location: where the battery and any extra equipment will go, and access for cabling.

An online estimator can ask these questions before you visit and give a ballpark range, so the survey focuses on confirming details. See instant quote calculators.

Sizing honestly

A bigger battery isn’t always better. Size it to the household’s evening use and the solar they have or plan, and explain why. A customer who understands the reasoning is more likely to trust you and less likely to choose on price alone.

What to include in the quote

battery make, model and usable capacity;
inverter details, including whether a new or hybrid inverter is needed;
installation work, cabling, isolation and any consumer unit changes;
monitoring app and set-up;
warranty terms for equipment and workmanship;
commissioning and paperwork;
Any tax and incentives, clearly shown.

Tax and incentives on batteries

Tax rates, rebates and incentives for home batteries differ by country and change often, so check the current local rules for each type of installation and show tax and any incentive clearly. In Great Britain, batteries installed in homes can qualify for a zero rate of VAT under the energy-saving materials relief, due to run until 31 March 2027. See should prices include tax?

Explaining value without over-promising

Customers want to know if a battery is worth it. Give an honest, explained estimate:

what share of their solar they could use themselves;
how a cheaper overnight tariff could be used, if they have one;
clear assumptions and a range, not a single headline figure.

Avoid guarantees about future energy prices or tariff changes you don’t control.

Selling batteries to past solar customers

Customers who installed solar without a battery are your warmest leads. A friendly message explaining what a battery could do for their household, with a no-pressure check of their system, often brings good work. Only contact people who agreed to hear from you. See how to get more solar leads.

Questions

Can a battery be added to any solar system?

Often, but it may need a different or additional inverter. Check the existing system before quoting a firm price.

Should I quote a battery without a survey?

You can give a ballpark range from the customer’s answers, then confirm after checking the existing system and installation location.

Do customers need solar to benefit from a battery?

Some use batteries to charge on cheaper overnight tariffs without solar. Whether it’s worthwhile depends on their tariff and use, so explain it honestly.

For quoting full systems, see how to quote solar panel installations.