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Old 27-11-2012, 18:57   #1
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12v solar to 36v battery bank

I recently installed a 7A 128W solar panel to a 36V battery bank made up of 6 6V batteries connected in series. After routing it through the MPPT controller it's putting out 12V so I connected the neutral line to neutral and the positive to the positive on the second battery so it connects 12v to 12 v. Did I do this correct? Will the power spill over to the other 4 batteries since they are connected in series?Thanks!
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Old 27-11-2012, 19:37   #2
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Re: 12v solar to 36v battery bank

No, no, no. "Shirley you're joking" [Airplane]

There's no "neutral" in a DC system, there's positive and ground. Neutral refers to a line in AC systems.

All you are going to do is make one battery very well charged while the others aren't, and the resulting difference is just going to screw up your system. Disconnect it now before something blows out or blows up. If you have a 36V battery bank, that sounds like an aircraft not a conventional BOAT.

You need a nominal 36-volt solar panel, or three 12volt panels in series, and an MPPT controller that can handle 36 volts, to charge the 36-volt house bank, if that's what you really have.

I'd strongly suggest some heavy reading or calling in an electrician before something exciting happens.
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Old 27-11-2012, 20:17   #3
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Re: 12v solar to 36v battery bank

Thanks for the reply. The panels not hooked up right now so that's good. Do they make 36V panels? It is a Duffy electric boat that runs on 6 golf cart batteries.
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Old 27-11-2012, 20:26   #4
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Re: 12v solar to 36v battery bank

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Do they make 36V panels?
Yes.

Quote:
calling in an electrician before something exciting happens.
You are dealing with real energy here that can do significant damage in the blink of an eye if the system is not installed correctly. Based only on your initial question; hire a professional and learn from him/her.
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Old 27-11-2012, 20:31   #5
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Re: 12v solar to 36v battery bank

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Originally Posted by Cruisingirie View Post
Thanks for the reply. The panels not hooked up right now so that's good. Do they make 36V panels? It is a Duffy electric boat that runs on 6 golf cart batteries.
If you have an MPPT you can use any panels that produce more than 36 volts. We bought 54 VDC Sanyo panels vor our 24 VDC batteries. MPPT can only drop voltage. It cannot boost. Spend som time reading Handy BOb's Blog. - a great source of hard knocks wisdom. HandyBob's Blog
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Old 27-11-2012, 20:44   #6
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Re: 12v solar to 36v battery bank

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Originally Posted by Nicholson58 View Post
MPPT can only drop voltage. It cannot boost.
Generally true, but Genasun makes one exactly suited to the OP's purpose:

https://genasun.com/products-store/s...ollers/gvb-pb/

This will boost a 12V panel to charge 24/36/48V batteries.
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Old 27-11-2012, 20:47   #7
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Re: 12v solar to 36v battery bank

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Thanks for the reply. The panels not hooked up right now so that's good. Do they make 36V panels? It is a Duffy electric boat that runs on 6 golf cart batteries.
Cool boat! I think you're going to be far better off going with panels made for 36v (or larger if using a MPPT controller that will bank it down to whatever your charge voltage is.)

I'll bet the folks at Duffy have already figured this out and may have suggestions as to the best solar array. Have you checked with them?
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