Electrical calculators: consumption, inverter, wiring
From daily consumption to the right inverter size and the correct wire gauge: here are the calculators for your 12-volt system and shore power hookup.
Power consumption
Calculate your RV's daily power consumption in Wh and Ah: fridge, lights, pump, laptop, furnace and 120 V appliances through the inverter – with presets and loss calculation.
Open calculatorInverter size
Calculate the inverter wattage needed for a coffee maker, induction cooktop, hair dryer & co., the battery current at 12 V or 24 V and the daily losses from efficiency and idle draw.
Open calculatorVoltage drop
Calculate the voltage drop in a 12 V or 24 V wire from length, current and cross-section – with power loss, voltage at the load and recommendation (≤ 3%).
Open calculatorWire gauge
Calculate the minimum wire size for 12 V and 24 V circuits from current, length and permissible voltage drop – with AWG standard size and notes on ampacity and fusing.
Open calculatorShore power cost
Calculate electricity costs at the campground: consumption per day, electric heating, kWh price or flat rate – and from which consumption the flat rate pays off.
Open calculatorFridge consumption
Calculate the electricity (Wh, Ah) or propane consumption of your RV refrigerator per day – compressor, absorption or cooler – and how long the battery lasts with it.
Open calculatorPower station
Calculate how long your power station (e.g. 500, 1,000 or 2,000 Wh) powers a cooler, laptop, phone and 120 V appliances – with inverter losses and usable capacity.
Open calculatorUSB-C charging time
Calculate the charging time of a smartphone, tablet or laptop via USB-C: battery in mAh or Wh, charger power, device limit and charge curve – also on a 12 V adapter in the RV.
Open calculatorDC-DC charger
Calculate how many Ah your DC-DC charger puts into the house battery per hour of driving, how long the drive to the target state of charge takes and what the alternator must deliver.
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