Calculate your need for solar panels on your boat, caravan, cottage and Off Grid

Solar cells … How many watts do I need?

To find out how many solar panels you need, you should start by calculating your need for power.
Enter in this solar calculator the electrical appliances you have, how many watts they use (this is typically in the manual or printed on the unit) and how many hours you typically use them in a day. Remember that eg. a refrigerator is not running all the time, but perhaps only 25% of the time.
You need the irradiation of sunlight on the place you want the solar cells to work and use the lowest returned figur for the months in which you have power requirements. Incoming radiation can be calculated in this irradiation calculater that covers the entire world.
And then you know how many watts of solar you need. 🙂

Battery capacity

The solar calculator also shows you how much battery capacity you need. It also takes into account that an AGM battery should not be discharged more than 50%. GEL batteries can better handle additional discharge, but it is not recommended.

ATTENTION !! You must use dot instead of a comma in the calculator!