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Home Forums Technical Discussion Charge Controller Size? – Help Please Re: Charge Controller Size? – Help Please

Nick Rosen

I am just starting my first solar run with two 85 wpa (>170 wpa) modules,

and I am told a 20 amp charger will do nicely for both

of them (I am using 2 130 ah each gel batteries – I have a generator backup

and an additional charger for a bad weather scenario.

All in all, my equipment is on the generous side

(what else do you NEED to run but a medium-sized computer system?)

– a 10 amp solar charger might do, too.

Remember that batteries do not like to be charged rapidly

but slowly, and that they do not like to be discharged below about

80 percent (even good ones, never mind car batteries).

I would have used a 170 wpa panel and one 250 ah battery,

but these items are bulky and heavy and I thought it best

to get items that one person alonecan still handle – one of

my batteries weighs about 40 kilos, but the bigger one

would have been more than 75 :)

Remember that the batteries should always be the strongest part

of your setup (but if I had gotten the batteries that would have lastet me a dozen years, I would have had to lay out about 3000 Euros for that alone…)

so I chose the cheaper gel type, they should last about 5 years maybe,

constantly but cautiously used.