48v system off grid, solar controller question. (why only pwm ?)

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leverg asked Mar 15, '22

48v system off grid, solar controller question. (why only pwm ?)

Hi,

I,m looking for a 48v system to build a off grid system in the future. 48v seems to me the easiest as this uses much thinner cables than a 12 or 24v system. However, when browsing for a 48v solar controller I only see pwm controllers and 2 mppt,s but those are quitte expensive. Is there a reason why there aren`t many mppt 48v controllers and so much pwm controllers ?

MPPT Controllers 48v battery BlueSolar PWM

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Answer 1 · 2022-03-16T03:04:59Z

klim8skeptic answered · Mar 16, 2022 at 03:04 AM

Ther are literally dozens of Victron mppt controllers that are 48v compatable.

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leverg commented · Mar 16, 2022 at 12:29 PM

You are right, I did mark 48v only instead of 12-48 volt on stroomwinkel.nl ( dutch firm) So I ended up with this :) https://stroomwinkel.nl/solar/solar-regelaar.html?accu_spanning=1399

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Answer 2 · 2022-03-16T08:19:57Z

Alexandra answered · Mar 16, 2022 at 08:19 AM

@Leverg

All the mppts of the 150v to 450v range will work for 48v system. With the exception of the 100/20 48v model specially made for 48v.

Good mppts are always more expensive purchase but the return on investment with them is worth it in the end.

What amperage do you want to charge at or use? (How much solar are you installing?)

Anything under 150W it makes sense to get PWM.

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leverg commented · Mar 16, 2022 at 12:33 PM

Don`t yet know what amperage. It,s for future use, just putting things together how to build such a system for offgrid use. Already did my boat off grid, but that,s quitte a simple system. Solar panel, mppt, multiplus, cerbo, batteries (AGM), no grid connection. Working perfectly. So now thinking about getting my house off grid, or at least less dependable for the normal powergrid.

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