Understanding your RV daily load
What a typical daily load actually looks like
A boondocking RV with a 12V compressor fridge, LED lighting, a water pump, and basic electronics like a laptop and phone charging commonly lands between 1,200 and 2,000Wh a day. Adding a CPAP machine, satellite internet like Starlink, or regular use of high-draw appliances like a microwave or coffee maker can push the total to 2,000 to 3,000Wh, which is a meaningfully different solar and battery sizing target. The federal ITC calculator picks up where this leaves off, using the figure you just found.
Why short high-watt appliances matter less than long low-watt ones
It's tempting to worry most about your highest-wattage appliance, but total watt-hours depend on both watts and hours together. A 1,000-watt microwave used for 9 minutes a day only contributes 150Wh, while a 50-watt fridge running 8 hours straight contributes 400Wh, nearly three times as much despite a much lower peak wattage. This is why the fridge, not the microwave, usually drives the bulk of an RV's daily energy use.
Starlink and satellite internet are bigger loads than they look
Starlink's RV and roam-focused plans typically draw 40 to 75 watts while active. Left running most of a working day, that adds 400 to 750Wh, making it one of the largest single loads in many modern boondocking setups, on par with or exceeding the fridge. Builders adding satellite internet to an existing system should re-run their load and battery sizing rather than assuming the old numbers still hold. Real household consumption patterns, the kind EIA tracks in its residential energy survey, offer a useful sanity check against whatever total you land on here, even though an RV's load profile looks different from a house's.
Why a margin matters even after a careful count
Even a thorough appliance count tends to run a little low in practice, since actual usage hours drift and small forgotten devices add up. A 10% to 15% margin absorbs this without meaningfully oversizing the rest of the system, which is why it's built into this calculator as a default rather than an afterthought. the Department of Energy's Energy Saver guide covers the general method behind building in a margin like this.
What to do with your total daily load
Take the daily total straight into the RV solar wattage calculator and the RV battery bank sizing calculator, since both use this exact figure as their starting input. If your monthly electric bill from home is a more familiar reference point than a room-by-room count, the system size by monthly kWh usage tool in our system sizing tools works from that instead, and the federal ITC calculator in our rebates and incentives tools is worth checking if a larger load pushes your system size, and cost, meaningfully higher.