Calculators
Volt Resources calculators for RV 12V sizing—plan battery amp-hours, cable gauge, and fuse ratings before you buy parts or open the panel. Each tool is a planning aid; always confirm against equipment manuals and local electrical practice.
Battery Amp-Hour Calculator
Estimate house-battery capacity for dry camping. Add your loads, nights, and compare usable Ah for lead-acid vs LiFePO4.
Open calculator →Cable Sizing Calculator
Pick conductor size for 12V (or 24V) runs from current, one-way length, and voltage-drop limit—so cables stay cool and appliances see enough volts.
Open calculator →Fuse Calculator
Size a DC fuse from continuous current (with a 125% planning factor) and optionally check it against wire ampacity so the fuse protects the cable.
Open calculator →Safety first: Disconnect shore power and other charging sources before opening panels or changing RV wiring. These calculators are educational guidance from Volt Resources—not a substitute for manufacturer instructions or a qualified RV electrician.