RV power questions, answered with numbers — not forum arguments
Last updated: September 3, 2026
Most RV power answers online come in two flavours: brand calculators that end in a shopping cart, or forum threads where estimates for the same question range from 2 hours to 9 days. The difference is almost always a handful of variables — battery chemistry, depth of discharge, duty cycle, inverter losses — that the tools skip. These calculators don't.
Start with a calculator
Battery Runtime Calculator
How long will your battery bank run your furnace, fridge, and lights — chemistry-aware, with duty cycle.
RV Generator Size Calculator
Size a generator from your actual appliance list, including AC starting surge and soft-starters.
Propane Usage Calculator
Turn appliance BTU ratings into gallons per day and days per tank.
Inverter Size Calculator
Continuous vs surge watts, and what an inverter actually pulls from your battery.
Solar Panel Calculator
Replace last night's battery use with realistic sun hours and system losses.
RV AC Power Checker
Will your generator or inverter start and run a 13.5k/15k BTU air conditioner?
Or grab a reference table
RV Appliance Wattage Chart
Running and starting watts for the appliances that matter, 12V and 120V.
RV Propane Tank Sizes
20 lb, 30 lb, 40 lb and ASME tanks: gallons, BTU content, full weight.
RV Battery Group Sizes
BCI Group 24/27/31/4D/8D: dimensions, Ah, weight, and lithium equivalents.
Guides
- How Long Will a Battery Run an RV Furnace? — The forum-question, answered with real furnace amp draws and duty cycle — with worked examples.
- Lead Acid vs Lithium RV Batteries — Usable Ah per pound, cold behavior, charging, and cost per usable amp-hour.
- How Many Watts Does an RV Use Per Day? — Realistic daily Wh budgets for weekend trips vs full boondocking.
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