Backup runtime guide
How Long Will a Solar Battery Power My Home?
Runtime is a moving equation: stored energy divided by the loads you choose to run.
Two homes with the same battery can experience very different outage runtime. Refrigeration and a few lights use far less energy than central air conditioning, electric heat, water heating, cooking, or vehicle charging.
What determines the answer?
Begin with usable capacity
The amount of stored energy available above the configured reserve is the starting point for runtime.
Control household demand
Turning off high-demand loads and staggering appliance use can materially extend backup duration.
Treat solar as variable
Daytime solar can extend an outage plan, but clouds, shade, season, and array size make production variable.
Frequently asked questions
What drains a home battery fastest?+
Heating and cooling, electric water heating, cooking, clothes drying, pool equipment, pumps, and vehicle charging can be major loads.
Does the battery always keep a reserve?+
Reserve behavior is configurable on many systems. Settings should reflect the homeowner’s resilience and energy-management goals.
How can I get a realistic estimate?+
Provide recent usage information and identify the exact circuits and appliances you want to operate during an outage.