A battery should be selected for the work it must do: keep essential services running, move daytime solar into the evening, or support a specific operating window.
Define the critical circuits
Decide which circuits must remain on during an outage. Separating essential circuits from high-demand discretionary loads makes backup behaviour easier to understand. Let the installer document what is included and what is excluded.
Check both energy and output
Compare usable capacity, continuous charge and discharge limits, compatible inverter settings and warranty conditions. Capacity alone does not show whether a battery can deliver the power your load needs. Compatibility must be checked for the complete system.
Keep a sensible reserve
A reserve can preserve energy for an unexpected outage, but it reduces the energy available for normal evening use. Ask the installer to explain reserve settings, low-battery behaviour and recovery after an extended outage. The right choice balances runtime, cost and your tolerance for interruption.
Further reading
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