Marine Battery Bank & Inverter DC Wire Sizer
Calculate daily Amp-hour (Ah) and Watt-hour (Wh) load budgets, lithium (LiFePO4) or AGM battery bank capacity, and ABYC E-11 compliant DC cable gauge (AWG) for marine inverters.
System Voltage & Inverter Load
Watts
e.g., 2000W or 3000W Victron / Mastervolt.
Wh/day
Fridge, navigation, watermaker, lighting.
DC Conductor Cable Run (ABYC E-11)
ft
Round trip is automatically 2× distance.
ABYC Conductor Recommendation
2/0 AWG MARINE CABLE
Minimum Battery Capacity
198 Ah
158 Ah usable capacity (80% DoD)
Inverter Full-Load DC Current
194.2 Amps
At 86% inverter efficiency
Recommended ABYC Cable Gauge
2/0 AWG
133,100 Circular Mils
Actual Voltage Drop at Full Load
0.18 V (1.5%)
Well within 3% ABYC standard
Overcurrent Protection & ABYC Safety
Recommended Fuse / Breaker (MRBF / Class T):
250 Amp Class T Fuse
ABYC E-11 Max Distance to Fuse:
7 inches from positive terminal
Total Conductor Loop Length:
12 ft round trip (pos + neg)
ABYC E-11 Standards Compliance
Marine Electrical
Calculated via ABYC circular mil formula: CM = (K × I × L) / Vdrop, using copper constant K = 10.75. Inverter DC feeds require Class T or MRBF fuses with high interrupt capacity (AIC ≥ 10,000A) to protect against dead shorts on large lithium or AGM banks.