question

doools avatar image
doools asked

What size mppt controller is best for my application

Hey Guys im stuck,

i am going to mount a 170w panel on my roof of my 4wd but also have a 160w flexipanel i will use occasinal when parked up. What mppt would best suit my needs and also what dcdc would suit that controller ?

100AH lithuim for reference

Thank you

MPPT Controllers
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1 Answer
Alexandra avatar image
Alexandra answered ·
@Doools

It depends on if you are upgrading or will you keep to the two separate panels?

170W ÷ 12v = 14Amps max charging so a 75/15 smart mppt will do for each panel.

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doools avatar image doools commented ·
so i can run 170w permant on roof and than the 160w ontop of the 170 when at camp for a combined 350w of panels ? i wont be upgrading these panels
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kevgermany avatar image kevgermany ♦♦ doools commented ·
Yes, but note that @Alexandra recommended two controllers. The outputs from these would be wired in parallel.
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Alexandra avatar image Alexandra ♦ kevgermany ♦♦ commented ·

@Doools

Two panels on one 75/15 will not increase your PV yeild.

12v x 15A = 180W yeild on one charge controller.

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Alexandra avatar image Alexandra ♦ Alexandra ♦ commented ·
The only time two panels on one charge controller would make sense would be in low irradiance conditions and you need more surface area to increase yeild.
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