The final part to sizing your solar system is the solar panels. The power generation rating of a solar panel is also given in watts.
Theory vs practice
In theory, to calculate the energy it can supply to the battery, you multiply watts (of the solar panel) by the hours exposed to sunshine.
In practice it’s not a great way to calculate the output from a solar panel so we work to a few simple rules.
We would generally advise that an average UK winter's day will only give you one hour of sunshine
An average UK summer's days will give you six hours of sunshine
So in winter a 10w panel will provide 10w worth of energy back into your battery. (10w x 1 = 10w)
In Summer a 10w panel will provide 60w worth of energy back into your battery. (10w x 6 = 60w)
Using the above calculation takes into consideration any losses in the system from the regulator, cables and battery you may be using.
For your caravan, motorhome or campervan we can supply you a range of solar panels from a small 5w unit all the way to 200w units. Plus you can mix and match panel sizes to create the power generation you want.
For more information and details about the benefits of our range of premium solar panels visit our PV Logic page.