a good solar charger for flash lights


New member
Mar 26, 2016
I am looking for a good solar charger for 10,000 Mah D cells specifically, and I haven't found any. The best I found takes 59 hours to charge two. I will use a pair in about 3 or 4 days. It will take longer to charge them than it will to USE them, so the math tells me no matter how many batteries I have, or chargers, sooner or later I will be out of power.

Does anyone know what the maximum charge rate that can be given to a 10,000 Mah D cell. I have toyed with getting a solar 12 volt car battery charger and putting 8 of the D cells in series and charging them that way, but considered the fact that they may charge to quickly and end up in an explosion has caused some concern.

I would rather buy something already on the market, so if anyone has had good success with existing chargers on the market that would work well also.

Thanks for your help



Well-known member
CPF Supporter
Dec 20, 2012
Northern New Jersey
I can't make a specific recommendation, because I don't have any solar.

Have you looked at This discussion?

Doing the math... 10,000 mah @ 1.5 volts is 15 watts hours. For each D cell.

They should probably charge over a number of hours, let's say 4 hours, so if you got a 15 watts hour solar panel, and charged 4 cells at a time, then in 4 hours, all four will be charged. Considering that there will be some losses, and not always perfect conditions, then I imagine that six hours in the sun, should do all four cells.

How long does it take to charge your D cells when running on mains power? You should be able to duplicate that running on solar. You may need a larger solar setup than whatever it is that you were looking at.

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