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Old 20-05-2015, 11:38   #1
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Location: Boot Key Fl
Boat: 1987 Endeavor 37 B plan
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Solar Mppt Question

I have 4 gc10 6 volt batteries wires as 2 12 volt batteries with 430 amp hour capacity at c20 rate.

I am getting a 345 watt solar panel and sunforce mppt charge controller. I average 60 amp hours a day of use. Never over 80 amp hours.

in the sun tropic where I am o think I can assume in decent weather I will get more than 80 amp hours a day in power.

my question is how does that charging process work as far as amps in aa batteries approach full charge. If I'm trying to charge from 80 to 100 percent will I be getting significantly lower amps to the batteries or will I be more likely charging between 60 and 80 percent like I do now with generator and old school c charger?

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Old 20-05-2015, 11:54   #2
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Re: Solar Mppt Question

A "true" 100% charge takes a long time to achieve, but with 345w of solar and only 60AHrs a day use in a sub tropical area you will be reaching float before midday and getting very close to 100% charge on most days.

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Old 20-05-2015, 12:06   #3
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Re: Solar Mppt Question

My boat sits out on a mooring using 60-80AH a day and with my 290W panel normally the system will go into absorption for at least 1 hour a day (been doing the full programed 2 hours the last 2 weeks up here in the North). Pretty much absorption starts right about the time the battery monitor hits 100% charged.

So the simple answer for you is mostly:

stop blowing smoke up my rear, blow it at the sails instead
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Old 20-05-2015, 12:25   #4
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Re: Solar Mppt Question

And be sure to check the water level in your batteries regularly.
Take two at low eight
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mppt, solar

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