Do the maths on your rig before you spend.
Free, no-nonsense calculators for Aussie caravanners, campers and 4WDers. Work out what your setup actually needs, see the working, then buy the right gear once.
Tools
12V Power Budget & Lithium Battery Sizer
Add up your fridge, lights, pump and chargers, then size your battery, solar and DC-DC charger.
LiveSolar Panel & Blanket Sizer
Panel watts by Aussie town and month, with shading and angle losses, plus matching blankets, roof panels and MPPT controllers.
DC-DC Charger & Cable Size
Pick the right charger and cable gauge for your run length without voltage drop.
Tyre Pressures
Starting pressures for highway, gravel and sand based on your load.
Towing Weights (GVM, GCM, ATM)
Check you are legal and under every limit before you hitch up.
Towing Trip Fuel Cost
Fuel cost for a trip with the van on the back, using real towing consumption.
Water: Days Off-Grid
How long your tanks last for your crew, showers and dishes.
Why RigMaths?
Most "how big a battery do I need" answers are a guess. Our calculators use your actual appliances, how long you stay off-grid and Australian sun hours, and they show every step so you can check the numbers yourself.
Calculators are a guide only. Always get wiring done by a qualified auto electrician.