You're on Wired For The Wild, part of the Bush & Bench family
Calculator Library
Every calculator on this site, grouped by topic, free to use.
Off-Grid 12V
Camping, caravan and 4WD power.
Solar
Solar Charging Check
Compare your daily solar with your daily use, and see roughly how much solar would balance it.
Open calculator →Solar Panel Sizing
Work out how many watts of solar panels you need to cover your daily use, and how many panels that takes.
Open calculator →Wiring & Charging
DC-DC Charger
Estimate the DC-DC charger size to recharge your auxiliary battery while driving, with input current and alternator load.
Open calculator →Charger & Inverter
Work out the charger current needed to refill your battery in the time you have.
Open calculator →Voltage Drop
Estimate the voltage drop and power loss on a DC copper cable run.
Open calculator →Cable Size
Find the smallest copper size that meets a voltage drop target. Voltage drop only.
Open calculator →Fuse Size
Find a starting fuse size from your load, and check it isn't bigger than your cable can carry.
Open calculator →Batteries
Battery Sizing
List what you run each day to get your daily energy use in Wh. It also sizes the battery in step 2.
Open calculator →Battery Runtime
Estimate how long a battery or portable power station will run a load, from its Ah or Wh rating.
Open calculator →Battery Charging Time
Estimate how long a mains, DC-DC or solar charger takes to bring your battery from one charge level to another.
Open calculator →Series & Parallel
Work out the voltage, capacity and energy of batteries wired in series, parallel or both, and how many you need.
Open calculator →Fridge Power Draw
Estimate how much power a compressor fridge uses each day, and how many days your battery could run it.
Open calculator →Power Station Runtime
Estimate how long a portable power station will run your 240V AC and 12V or USB loads, allowing for inverter losses.
Open calculator →Trip Planning
Camping Trip Power Budget
Bring your daily use, battery and charging together to see whether they could cover the whole trip.
Open calculator →Check My System
Answer a few questions about your existing 12V gear and get a checklist of what to confirm.
Open calculator →