PowerGearGuide Calculator Center

Size the system before you buy it.

Use practical planning calculators for output, battery capacity, home backup, solar panels, charging time and energy cost. The goal is simple: turn your real loads into a realistic power target.

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Start with the number you actually need to know. Watts determine whether a power source can run the load. Watt-hours determine how long it can run. Charging input determines how quickly you can put that energy back. Output Runtime Battery Capacity Solar Input Charging Time Energy Cost
12 Planning Tools

Power, battery and solar calculators

Choose the calculator that matches your current planning question. Use the result as a sizing estimate, then verify the final system against manufacturer specifications and real appliance requirements.

A better way to size backup power

Use the calculators in this order when you are building a system from scratch.

1Add your loadsList what must run at the same time and account for startup surges. 2Set the runtimeDecide how many hours or days of energy the system must provide. 3Size the batteryConvert load and runtime into usable watt-hours with realistic losses. 4Plan rechargingMake sure wall, solar or generator charging can replenish the energy you use.

Got your numbers? Now choose the equipment.

Move from sizing into buying guides, product comparisons or brand research once you know the output, capacity and charging requirements your system needs to meet.

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