Battery Sizing

Browse 3 battery sizing tools. Opening DC Cable Size Calculator.

Battery Bank Size (Ah)Size a battery bank in amp-hours from load, runtime, and voltage.Use this to buy a battery bank big enough without overspending on capacity.
Inverter SizingFind minimum inverter size from peak load and safety margin.Use this to choose an inverter that handles your loads with room to spare.
DC Cable Size CalculatorRecommend DC wire gauge from current, one-way length, and system voltage.Use this to pick a wire gauge that's safe and doesn't waste power.

DC Cable Size Calculator

Inputs

Adjust values to update results live

Load current (A)

One-way length (FT)

Recommended AWG

Enter amps, length & voltage

Undersized wire causes voltage drop and heat. This tool picks a conservative AWG from ampacity tables, then checks ~3% drop over your run length.

Inverters, motors, and lithium charging spikes may need the next size up. Follow local electrical code for final installs.

Undersized wire causes voltage drop and heat. This tool picks a conservative AWG from ampacity tables, then checks ~3% drop over your run length.

Inverters, motors, and lithium charging spikes may need the next size up. Follow local electrical code for final installs.

Q: One-way or round-trip length? A: Enter one-way distance; drop math uses round-trip resistance. Q: Copper only? A: Yes—aluminum needs larger gauge.

Watts to AmpsConvert electrical power (watts) to current (amps) at a given voltage.Use this to check a device won't overload your circuit or blow a fuse.
Battery Bank Size (Ah)Size a battery bank in amp-hours from load, runtime, and voltage.Use this to buy a battery bank big enough without overspending on capacity.
Solar Array Current CalculatorEstimate array current from total panel watts and system voltage.Use this to size your wiring and fuses safely for your solar array.
Inverter SizingFind minimum inverter size from peak load and safety margin.Use this to choose an inverter that handles your loads with room to spare.

Undersized wire causes voltage drop and heat. This tool picks a conservative AWG from ampacity tables, then checks ~3% drop over your run length.

Inverters, motors, and lithium charging spikes may need the next size up. Follow local electrical code for final installs.

Undersized wire causes voltage drop and heat. This tool picks a conservative AWG from ampacity tables, then checks ~3% drop over your run length.

Inverters, motors, and lithium charging spikes may need the next size up. Follow local electrical code for final installs.

Q: One-way or round-trip length? A: Enter one-way distance; drop math uses round-trip resistance. Q: Copper only? A: Yes—aluminum needs larger gauge.