Which MPPT SmartSolar should I use?

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sonntagskind3 asked Apr 12, '24

Which MPPT SmartSolar should I use?

HI there, I am new here and I just wanted to make sure I buy the correct MPPT SmartSolar.
I used the calculator but I am not sure if I used the correct number since it is a bit confusing for me.
I would like to buy 3 PV Modules as folowing and connect them "Parallel".

Thank you very much in advance.

1x

Maximale Leistung (ppm): 200W ± 5%
Zellmaterial: Monokristallines Silizium + ETFE
Maximale Conversion-Rate (EFF): 23 % – 25 %
Leerlaufspannung (Vor): 38,4V土5%
Maximale Ausgangsspannung (Vm): 32V土5%
Kurzschlussstrom (lse): 6,87A土5%
Maximaler Ausgangsstrom (lm): 6,25A 土5%

2X

Maximale Leistung (ppm): 100W ± 5%
Zellmaterial: Monokristallines Silizium + ETFE
Maximale Conversion-Rate (EFF): 23 % – 25 %
Leerlaufspannung (Vor): 30,6 V ± 5 %
Maximale Ausgangsspannung (Vm): 25,5 V ± 5 %
Kurzschlussstrom (lse): 4,58 A 土 5 %
Maximaler Ausgangsstrom (lm): 4,17 A bei 5 %

MPPT SmartSolar Solar Panel

2 |3000

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Modifications Space

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Answer 1 · 2024-04-12T09:28:32Z

duivert answered · Apr 12 at 09:28 AM

hi if youre going to use different panels, you will not get full potential out of them... or you would need to use 2 mppt's

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Answer 2 · 2024-04-12T09:51:05Z

sonntagskind3 answered · Apr 12 at 09:51 AM

hi there, I could use blocking diodes so the current would go over. Would that change anything?

4

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kevgermany ♦♦ commented · Apr 12 at 09:55 AM

No. Your proposed setup has panels with very different values for max power voltage and current.

Guess there's a reason for the proposed setup. If it's not space, maybe look at 3 of the larger panels.

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sonntagskind3 kevgermany ♦♦ commented · Apr 12 at 10:19 AM

yes the space is my problem. The panals are supposed to be installed on a caravan and I wanted to use as much space as possible.

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duivert sonntagskind3 commented · Apr 12 at 11:40 AM

Then you will have to use 2 small mppt’s

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kevgermany ♦♦ sonntagskind3 commented · Apr 12 at 12:06 PM

Maybe look at different panels. If you can find ones with the same or similar Vmpp, wire in parallel. If you can find with the same Impp, wire in series. Not optimal, but it works.

That way you can use a single mppt, otherwise, as @duivert said, 2xmppt.

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Answer 3 · 2024-04-12T13:02:00Z

regman54 answered · Apr 12 at 01:02 PM

@Sonntagskind3 If 300 watts of solar will meet your needs have you considered using two 150 watt panels wired in series?

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