Megawatt RV calculators
Run the numbers first
Twelve tools for power, weight, wind, and money. The six from the original Megawatt site keep their exact math. Everything updates as you type.
The flagship
Plan the whole roof
Pick your coach, lay panels around the air conditioners, and get three ready-to-shop systems with battery, inverter, controller, and wire sized for you.
Power
Power tools
Batteries, panels, sun, and the copper that ties them together.
Battery bank
Loads, nights off-grid, and solar offset in. A Vatrer bank and system voltage out.
Solar array
Daily watt-hours over sun hours at 75 percent, matched to four real pack sizes.
Solar output by location and season
Last year's sunshine for your ZIP, month by month, in watt-hours from your panels.
Battery runtime
Watt-hours, your usable share, and a load. Hours and days on the battery.
Wire size and voltage drop
Amps, volts, and run length to a gauge, the drop you will see, and the fuse to pair with it.
7-day solar forecast
The next seven days of sun for your ZIP, and what it does to your battery.
Road
Road tools
Weight, wind, fuel, and the license in your wallet.
Max wind speed
Length, height, and weight to a parked and a 65 mph gust band.
Fuel savings
Class baseline weights, tank water weight, and an opt-in speed estimate.
RV weight and payload
GVWR minus the coach, cargo, people, water, and propane.
State RV license lookup
Notes for California, Texas, Maryland, and Illinois, plus a default for every other state.
Money
Money tools
What the generator and the campground cost you, and when solar catches up.