The typical size for a solar battery in the UK is between 5 and 20kWh. The right choice for a property, however, will depend on several factors. These include:
- Energy consumption – Household energy use can vary widely. For example, an average small flat may require around 5kWh per day, while a large house might use more than 12kWh per day.
- Occupant patterns – If people are home during the day, solar energy can be used immediately, reducing the need for solar battery storage. If occupants are only home in the evening, however, more energy will need to be stored in the battery, meaning a higher capacity should be considered.
- Solar PV system capacity – A solar battery should be sized according to how much energy the solar roof tiles generate. There’s no need to store more energy than the system is expected to produce, unless the intention is to fill the battery from the grid during cheap electric tariff prices often available in the middle of the night. Filling the battery from the grid can save significant amounts of money from your energy bill especially during Winter months when the power generated from your solar array usually less due to the reduction in daylight hours
- How the stored energy will be used – If the solar battery is intended to store excess day-time energy for use in the evening, then a smaller battery may suffice. A higher capacity will be necessary if the battery is intended for emergency backup power or if the household is entirely off-grid.
How do I choose the right size solar battery energy storage system?
Selecting the right size solar battery can be complicated. If you’re unsure, the Marley team can help you decide. Our complete solar system includes the residential solar battery in various capacities, and we’ll be happy to help you choose the right product for your project.