Calculators
Friendly tools for honest numbers
Eleven calculators, one solar planner, zero made-up stats. Every formula is written out under each tool so you can check our work.
Power and solar
Batteries, panels, wire, and how long the lights stay on.
How much battery does my rig need?
Loads, nights, and solar in. A Vatrer bank size out.
From the original Megawatt siteHow many solar watts should go on the roof?
Daily use and sun hours in. Panel watts and pack counts out.
From the original Megawatt siteHow much sun will I get there?
Real measured sun for a place, by month and for this week.
New toolHow long will my coffee maker run?
Any load, any battery. Hours of runtime.
New toolWhat size wire should I run?
DC gauge, voltage drop, and fuse size.
From the original Megawatt siteOn the road
Weight, wind, water, and the license in your wallet.
How much more can I pack?
GVWR math with water at 8.34 lb a gallon.
New toolHow much wind is too much for my rig?
Parked and 65 mph tipping bands.
From the original Megawatt siteWhat does all that water weigh, and what does slowing down save?
Water weight by tank level, and an opt-in speed estimate.
From the original Megawatt siteDo I need a special license to drive this thing?
CA, TX, MD, and IL notes as published. A default for the rest.
From the original Megawatt siteMoney
What the generator costs you and when solar pays it back.