RV power audit: make a daily watt-hour budget before buying
Measure RV appliance watts, duty cycles, inverter standby and recharge needs in one practical energy worksheet.
problem-solving · transparent planning
Your biggest power expense may be an appliance that runs quietly all day, not the one with the highest wattage. Make one 24-hour load budget before comparing battery sizes.
List the loads you actually use
Write the appliance, watts while operating and daily hours. For cycling devices, use measured on-time or measured watt-hours; do not assume their label wattage is continuous. Add lights, router, water pump and charging bricks rather than just the refrigerator. A small plug-in energy meter can capture AC loads where safe and compatible.
Translate watts into daily energy
Multiply watts by daily operating hours to get Wh/day. In an illustrative scenario, a 50W fridge running 40% of a day uses 50 × 9.6 = 480Wh/day. Add an always-on 6W router at 144Wh and 20W lights used four hours at 80Wh. The subtotal is 704Wh/day before any inverter standby and charging losses; it is not a measured RV consumption claim.
Add the difficult days
Your daily total is not a battery size. Set the number of days without useful charging, then account for the battery's usable fraction and conversion losses. Recalculate for hotter fridge operation, cooler batteries and cloudy conditions separately; avoid pretending that one summer day represents every trip.
Keep the measurement log honest
Write the date, weather, battery chemistry, meter location and what was excluded. If you have no watt meter, label every estimate and revisit it after a real overnight test. Then use the capacity tool and make decisions from the range rather than from a single ideal number.
What happens to your batteries during several cloudy days?
Build a seven-day reserve scenario from your own appliance loads, then save an equipment decision plan.
Turn your result into an equipment checklist
No fabricated product tests or affiliate claims. Compare verified specifications before buying.