Why Add Battery Storage?
Solar panels only generate electricity during the day. If you aren't home to use it, the excess energy is sent to the grid. A solar battery stores this excess energy so you can use it in the evening when electricity rates are typically highest.
Sizing Your Battery
Battery capacity is measured in kilowatt-hours (kWh). The right size depends on your energy usage and the size of your solar array:
- Small (2-4 kWh): Ideal for smaller homes with low evening energy use.
- Medium (5-8 kWh): The standard size for most 3-4 bedroom UK homes.
- Large (9-13+ kWh): Necessary for homes with EVs, heat pumps, or high energy consumption.
AC vs DC Coupled Systems
If you are installing a battery alongside new solar panels, a DC-coupled system is usually best. It shares a single inverter, making it highly efficient. If you are retrofitting a battery to existing solar panels, an AC-coupled system is often easier to install, as it operates independently of your existing solar inverter.
Lifespan and Warranties
Modern lithium-ion (Li-ion) and lithium iron phosphate (LiFePO4) batteries are built to last. Most reputable brands offer a 10-year warranty, guaranteeing that the battery will retain at least 60-70% of its original capacity after a decade of daily cycling.
Top Brands in the UK
Popular and reliable battery brands in the UK market include Tesla (Powerwall), GivEnergy, Pylontech, SolarEdge, and Growatt. Our network of independent installers can advise on the best hardware combination for your specific needs and budget.
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