Estimate Watts, Amps, Solar Panels, Solar Chargers, Batteries and Cost for it all.

Offgrid & RV Solar Calculator

Use this Solar System Calculator to estimate your power requirements, then choose specific Victron Solar Products and other options to build a parts cost estimate.

Note: Currently this tool is not very mobile friendly, we hope to change this soon. We always appreciate feedback. If you have feature requests please contact us.

Power Usage Estimates

Choose from preconfigured appliances and devices or add your own custom items. Each line item can be adjusted for power usage and hours used. To calculate your own power requrements for an appliance multiply amps x volts. Email us if you'd like an appliance added.



Watts (Volts x Amps)

Hours used per Day

Total usage per day

Solar Estimates

How many days of no sun or cloudy days before you need to plugin or run a generator. This multiplies your total power requirments by the number of days of reserve power.

How many hours of usable sunlight will the panels receive? MN Summer is about 5. Find yours using a solar calculator (new window link).

How much of the total sun energy available will ultimately get stored. We recommend 80%


Larger Solar Panels mean less holes in roof, but harder to find the open space without racking. Smaller panels mean less visible from the ground and more able to Tetris solar across the roof of your RV.

Solar Panels Total

To recharge battery bank fully from Solar in 5 Hours

Solar Chargers Total

Larger mppt solar chargers can support more panels, however larger strings of panels are more susceptible to partial shade conditions. For RVs we recommend more smaller chargers. This calculator currently does not account for the right ammount of panels per charger, contact us for consultation.

Batteries & DC Power System

Higher the voltage, more efficencies you gain with wiring and solar chargers. Step down converters are relatively inexpensive and can be a great way to still run 12v appliances with a 24 or 48v battery bank. Note: when adjusting DC voltage the solar chargers will adjust and batteries will be forced into multiples of 1,2 or 4 depending on voltage.

Larger batteries mean less wire and some space savings.

Batteries Total

Inverting Power

Inverting power controls how much AC power you can use at any single time.

Larger inverters will allow you to run more AC appliances at the same time.

Inverters Total

RV Solar Calculator Totals

We support, service and install solar products and rely on larger distributors to handle fulfillment. The best way to support us is to buy from our links below. If you need any service or support on your purchase, please contact us.

Solar Panels


MPPT Solar Chargers

1 Inverter / Charger

This tool is for rough estimation only. For a complete personal consultation and solar system overview contact us.

Estimated Component Cost

All Figures are rounded up for better performance. Example: if only 2.1 solar panels would be required, we'll recommend 3.

This is meant to serve as an estimation tool only. It does not account for installation, wire, fuses, breakers, diconnects, etc.

Total Power Required

Solar Panels

MPPT Chargers



1x Inverter $money

Estimated Total