Electrical Calculators
Free tools to help you size your battery system and wiring correctly.
Battery Sizing Calculator
Calculate how much battery capacity you need for 12-hour backup
kWh
Find this on your electric bill under "Total kWh Used"
Your Results
Daily Usage
0 kWh
12-Hour Backup
0 kWh
Recommended
0 kWh
Battery Options
Rick's Pro Tips
- This assumes whole-home backup. Size down if you only need essential circuits.
- The 20% buffer accounts for inverter losses and keeps LFP batteries above 20% charge for longevity.
Wire Size Calculator
Calculate wire gauge per NEC 310.16 (75°C copper)
A
ft
Recommended Wire Size
Ampacity (NEC 310.16)
-- AWG
Voltage Drop
--%