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Old 04-07-2021, 07:40 PM   #1
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Best MPPT for 24V solar system

Hi,

I will install 6 x 400W solar panels on my bus 40.8V / 9.81 Amps with a 24V 200AH battery. Not sure what MPPT I should purchase.

Any suggestion is welcomed from more experienced individuals than me!
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Old 04-07-2021, 08:21 PM   #2
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Quote:
Originally Posted by Ben3361 View Post
Hi,

I will install 6 x 400W solar panels on my bus 40.8V / 9.81 Amps with a 24V 200AH battery. Not sure what MPPT I should purchase.

Any suggestion is welcomed from more experienced individuals than me!
How are you wiring the panels? You can wire your panels in Series, Parallel, or a combination of both, and how you choose to do this has an impact on which MPPT you will need.


You will need something capable of 100A charge rate, panel wiring will decide what voltage rating you'll need.
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Old 04-07-2021, 08:51 PM   #3
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Not well versed but from what I read on the net I would do;

(3 times) 2 in series @ 81.6Volts
and then parallel the 3 for 29.43 Amps

Does that sound OK or should I do it differently?
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Old 04-08-2021, 08:04 PM   #4
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Victron's SmartSolar line and pricing give great flexibility.

Higher voltage single panels work best for MPPT's output boost.

The ideal for handling possible shade issues is one panel per SC.
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Old 04-09-2021, 04:59 PM   #5
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Not well versed but from what I read on the net I would do;

(3 times) 2 in series @ 81.6Volts
and then parallel the 3 for 29.43 Amps

Does that sound OK or should I do it differently?
Sounds fine to me. I run 2S5P (soon 2S10P).

However:

Quote:
Originally Posted by john61ct View Post
The ideal for handling possible shade issues is one panel per SC.
Cost wise, this approach might work well as well. The minimum charge controller you will need is 100V/100A, because although you have up to 81.6V 29.43A going IN (from solar), you will have up to 24V 100A going OUT (from the solar charge controller to the batteries).

Victrons are nice, however that's an expensive proposition ($785):
https://www.amazon.com/Victron-Energ.../dp/B07C6L79NW

If you go with three Victron MPPTs, you can save a little bit of cash ($226.30 * 3 = $678.30):
https://www.amazon.com/SmartSolar-MP.../dp/B073ZJ3L13

Each one of your series strings would get a charge controller, and like john mentioned this can actually be more efficient depending on how panels are shaded.

When I move from 2S5P to 2S10P I'll be getting a second Victron 250V/100A MPPT.
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Old 04-14-2021, 05:20 AM   #6
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Thanks.

I was thinking of going with a all in one Growatt or MPPT Solar.
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