question

sonntagskind3 avatar image
sonntagskind3 asked

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 SmartSolarSolar Panel
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3 Answers
Duivert NL avatar image
Duivert NL answered ·

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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sonntagskind3 avatar image
sonntagskind3 answered ·

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

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kevgermany avatar image kevgermany ♦♦ commented ·
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 avatar image sonntagskind3 kevgermany ♦♦ commented ·

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 NL avatar image Duivert NL sonntagskind3 commented ·
Then you will have to use 2 small mppt’s
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kevgermany avatar image kevgermany ♦♦ sonntagskind3 commented ·
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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regman54 avatar image
regman54 answered ·

@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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