The number of batteries you need depends on your home’s energy consumption and the size of each battery. For example, if your home uses 30 kWh of electricity per day and you want 24-hour battery backup, you can use three 10 kWh batteries or two 15 kWh batteries.
You can work with your solar installer to determine the ideal number of batteries for your system. A provider may recommend lithium-ion batteries since they can last over 4,000 cycles and do not require frequent replacements. Lead-acid batteries, however, only last for around 500 to 1,000 cycles and eventually need to be replaced every two to three years.
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