PV Gap

Nathaniel Said:

SOLAR PANELS. Electric 12 charging panel for motorhome.?

We Answered:

Typically, you will want to charge lead acid batteries at a rate of 5% their capacity, or at least 3%. So in your case, you have a 220 AH bank, and would want to charge at 6.6 A minimum, or better, 11 A. The lower figure is about a 100w panel, and the higher is about a 200w.

The 20w panel is good for maintaining batteries that were already charged from your alternator, but will be poor in getting discharged batteries to absorb charge.

As for type of panel, I would look for a crystalline silicon panel, either mono- or polycrystalline. Those flexible or thin-film panels wear out after a couple years, in my experience. I have a dead flexible panel on my roof to prove it, but the crystalline panels are still going strong after years.

Seth Said:

I am looking for a electric solar panel?

We Answered:

search the internet, there are many available, with different features. You need to decide if you want a grid tie system (recommended, if your power company allows it), or one with a lot of batteries.

You should consult a professional installer, as there are lots of things to consider. Grid tie or no grid tie, location, angle, batteries and their size, type, number, battery charge controller, inverter, house wiring and maintenance.

here is a 2000 watt unit for US$15k just as an example.

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