Do I parallel or series connect 12V panels to charge a 48V battery?

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Tim Dennehy asked Jul 30, '20

Do I parallel or series connect 12V panels to charge a 48V battery?

4 x victron 175W 12V open circuit V 23.7 ,9.03Amps will these work in Paralell on their own string going into a MTTP ? 48V

(do we work of open circuit voltage to trigger the MTTP ?

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Answer 1 · 2020-07-30T05:53:47Z

ejrossouw answered · Jul 30, 2020 at 05:53 AM

Hi @Timbo44 Given it is a 48V system, it will have to be series to ensure the Vbat+5V startup condition is met.

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Tim Dennehy commented · Jul 30, 2020 at 06:00 AM

appreciated, was hoping the open voltage would work :) and get us above 48+5

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Answer 2 · 2020-07-30T12:23:17Z

the-doon answered · Jul 30, 2020 at 12:23 PM

What model solar controller do you have? looking at the figures you have shown you are using Mono panels? If you are using a 100/20-48 you may exceed the maximum voltage with the 4 panels in series.

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