RV Inverter Sizing & Cable Gauge Calculator

Find the right pure sine wave inverter rating, recommended overcurrent protection, DC cable thickness, and daily energy losses based on continuous loads, peak surges, and cable run distance.

Continuous loadW (sum of active appliances)

Quick Add Appliances

Peak surge loadW (heavy motor startup)

System Voltage

Cable distance (one-way)ft (battery to inverter)

Inverter efficiency% (typically 85-95)

Inverter idle drawW (standby consumption)

// Output

Recommended inverter1900W

DC continuous current176A @ 12V

Surge capacity OK

Cable gauge2/0 AWG

Voltage drop1.42%

Fuse size225A

Fuse typeANL or Class T

Daily inverter loss1080Wh/day

Inverter sized with 25% continuous headroom.

Class T fuses are mandatory for lithium banks due to high short-circuit current.