Category: Battery Storage

A solar battery stores surplus solar electricity for use later in the day, increasing self-consumption and reducing the amount of expensive grid electricity purchased. Depending on consumption and system design, this can substantially improve independence and profitability. Batteries are available for new and existing systems, but their size and compatibility with the inverter should be planned carefully.

As a practical starting point, battery capacity in kWh should be at least similar to the inverter’s rated output in kW. An 8 kW hybrid inverter would therefore be paired with at least about 8 kWh of storage. A larger battery, potentially around a 2:1 ratio, can make better use of solar surpluses and reduce battery loading. The optimum size also depends on annual consumption, load profile and available solar generation.

Low-voltage batteries typically operate at about 48 V. They are widely used, can be cost-effective and are easy to scale with suitable cabling. High-voltage batteries start at roughly 120 V and can transmit power with lower currents and smaller cable cross-sections, which is useful for larger systems. They are usually connected in series and require a compatible external battery management system. The correct choice depends on system size and inverter compatibility.

Yes, many solar battery systems are modular and can be expanded. Depending on the manufacturer, modules can form battery groups of roughly 12 to 30 kWh, and identical groups can sometimes be connected in parallel using a hub or distributor. Compatibility, module age, state of charge, battery management and inverter capacity must all be checked before expansion.