Solar battery storage in Edinburgh: is it worth it?

A solar battery stores the electricity your panels generate during the day so you can use it in the evening or at night. Without a battery, surplus energy goes back to the grid and you are paid for it under the Smart Export Guarantee. With a battery, you keep that energy for yourself, which is usually worth more than the export payment — especially on a time-of-use tariff where evening electricity costs more than daytime rates.

How does a solar battery work with an Edinburgh roof?

Edinburgh roofs generate well during long summer days but produce very little in winter. A battery smooths this out by storing summer surplus for use the same evening, and by storing cheap off-peak grid electricity bought overnight for use during the morning peak. The battery charges automatically — you do not need to switch anything. The inverter decides when to charge from solar, when to charge from the grid, and when to discharge to your home.

Which homes benefit most from a battery?

Homes where someone is out during the day benefit most, because without a battery the solar surplus is exported for a low rate rather than used to power appliances. A battery captures that surplus and releases it in the evening when you are home cooking, washing and running appliances. Homes on time-of-use tariffs like Agile Octopus also benefit from charging the battery at cheap off-peak rates, even in winter when the panels produce little.

Can I add a battery later?

Yes, in most cases. An ac-coupled battery connects to your existing solar inverter and works alongside it. A dc-coupled battery may require a hybrid inverter, which means more work. If you think you might want a battery in the future, it is cheaper to specify a hybrid inverter at installation time than to retrofit later. We discuss this at the survey so you can decide with full information.

What about flats without roof access?

For Edinburgh flat owners who cannot access the roof, a battery alone can still cut bills significantly. By charging from cheap off-peak grid electricity and discharging during peak hours, a battery reduces the effective rate you pay per kilowatt-hour. This works best on a time-of-use tariff, but even on a standard tariff it can reduce your overall consumption from the grid.

How long does a battery last and what about warranties?

Most solar batteries carry a 10-year warranty and typically last beyond that. Capacity degrades gradually — usually retaining 60 to 80 percent of original capacity after 10 years of daily cycling. The warranty typically guarantees a minimum capacity at the end of the warranty period. We confirm the specific warranty terms for the battery we recommend in your written quotation.

Does a battery provide backup during a power cut?

Most standard battery installations do not provide backup during a power cut because the inverter is designed to shut down when the grid drops, to protect engineers working on the network. An emergency power socket or island-mode inverter can be added, but this increases the cost and should be specified before installation. If backup power is important to you, tell us at the survey so we can quote for the right equipment.