Do I need a battery with my solar panels?

No, you do not need a battery for solar panels to work — they generate electricity either way. But a battery helps if you use most of your electricity in the evening, because it stores daytime generation for later use. Without a battery, surplus power exports to the grid. With one, you store it and use it yourself. Sizing and placement are confirmed at survey.

How solar works without a battery

Without a battery, your solar panels generate electricity during daylight and your home uses that power first. Any surplus — the electricity you generate but do not use at that moment — flows to the grid, and you may receive export payments under the Smart Export Guarantee.Smart Export Guarantee payments, with rates set by each supplier. This setup suits households that use most of their electricity during the day, such as people working from home or retirees. It is simpler and costs less upfront because there is no battery or battery inverter to install.

How a battery changes things

A battery captures the surplus generation instead of exporting it, then releases it in the evening and overnight when your panels are not producing. This increases your self-consumption — the proportion of your generation that you use yourself rather than buy from the grid. Because self-consumption saves you buying electricity at your retail rate, which is usually higher than the export rate you would receive, a battery can improve the financial value of your system for households that are out during the day.

Batteries can also charge from the grid on cheaper off-peak electricity from a time-of-use tariff, then power the home during peak hours. This is useful in winter when solar generation is lower. The survey checks whether your tariff and usage pattern suit this.

When a battery helps

• You are out during the day and use most electricity in the evening or overnight.
• You are on a time-of-use tariff and could charge the battery on off-peak electricity.
• You want to maximise self-consumption and reduce reliance on the grid.
• You have a larger system that regularly generates more than you use during daylight.
• You want backup during short power interruptions (depending on the battery model).

When a battery may not be needed

• You use most of your electricity during daylight hours, so you already consume most of what you generate.
• Your roof is small and the system rarely produces a surplus to store.
• You prefer the lower upfront cost of a solar-only system and are happy with export payments.
• You plan to add a battery later — many systems can be made battery-ready with a hybrid inverter.

Battery sizing

A battery is sized to your daily electricity usage and your solar system’s generation. Too small and it fills and empties too quickly; too large and it rarely fills, so you pay for capacity you do not use. The survey reviews your usage pattern and recommends a usable capacity in kWh. The exact model, capacity and cost are confirmed on your written quote. We do not publish generic sizes because the right battery depends on your home and habits.

Tenement and flat considerations

In Edinburgh tenements and flats, space and safety often decide whether a battery is practical. The battery needs a suitable location — typically a utility room, cupboard or garage — with safe clearances and access to the consumer unit. Flats may have limited space, and shared buildings can raise placement and fire-safety questions. The survey checks where a battery can safely go and whether your electrical setup supports one. If there is no suitable location, a solar-only system may be the better option. See our battery storage guide for more on placement.

How do I decide?

The survey is the best way to decide. We review your usage, your roof, your tariff and the space available, then quote the system with and without a battery so you can compare both options. Call 0141 230 0198 or use the quote form. We install through MCS-certified partners.

Related pages

• Home battery storage in Edinburgh
• Solar with vs without a battery
• Is solar worth it in Scotland?

More answers from Scottish Energy Efficiency

Edinburgh Solar Hub is a trading name of Scot Energy Efficiency Ltd, company number 17408629, registered office 66 Paul Street, London EC2A 4NA.