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Go Back   SailNet Community > General Interest Forums > Gear & Maintenance > Electrical Systems
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  #1  
Old 09-15-2010
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45 watt solar array

2 friends of mine just gave me 2 harbor freight 45 watt solar arrays and i was wondering if i could hook up both charge controllers to one battery or do i need either 2 batteries or larger controller the one that came with the kit will only handle up to 6 amps each. array puts out 4.75 amps each.
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Old 09-15-2010
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You'd do much better having a single controller that can handle both arrays. If you use two controllers, you'll have the problem that the output from one can cause the other to cut back, and then you won't really be getting the full charging capability of either panel array.
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Old 09-15-2010
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ok thats what i thought i have figured my useages and one array would do the job most of the time however in the winter i may need to add a couple amps over the output of one pannel and was wondering if it would workas a booster. i was looking at a biggwer controller but cant afford it right now maybe in spring
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Old 09-20-2010
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You need to flip the charge controller switch off in late afternoon (5-6 pm) or it discharges. Back on in morning.

I have the same array and it works great!
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Old 09-20-2010
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thanks for the heads up i am going to place blocking diode in line under 5 bucks at rat shack
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Nope, no diode w/ a controller!

The charge controller has to see the battery voltage and the panel voltage to work right. Solar Panels (no charge controller) going straight to batteries, then you can use a diode.
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Old 09-20-2010
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thanks that will save me some money and time will need to upgrade controller next spring so i wont have to remember to turn it on
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