Wednesday, December 4, 2024

Re: [electricboats] Complex design issues

Yes, two strings of 4 panels is the way to go. Each to its own controller. 

I'm also using a MPPT controller to charge my 12V system from the 48V bank. In my case a 100/15 as I had it on hand. It occurs to me, one could use a 100/20 to charge to 48V system from the 12V system if the need arises.  Although I've not tried that yet.

On Thu, 5 Dec 2024, 07:19 kurtphone via groups.io, <kurtphone=gmail.com@groups.io> wrote:
I have 8 x 100 watt flex panels charging my 48 volt battery bank with 2 x Victron 100/20 48 volt MPPT solar controllers. I think you will be much better off with 4 panels in series to each controller and then parallel the controllers. 
I run the solar banks port and starboard so most shading degradation only affects one or the other solar bank at a time. A shadow on all or part of any panel drops the output of the whole series string. 

Slightly off topic…I am using a left over 12 volt smart solar controller as a DC-DC converter for charging my house bank from the traction bank. Charge parameters can be monitored and controlled with the Victron IPhone app. This works really nicely. 

Remember….no welding!

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