# Photovoltaic PV connection ???

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izentrop
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## Re: Photovoltaic connection of PV???

Hello,
What matters is that the strings are matched to the input characteristics of your MPPT controller(s). Without knowing them, we cannot advise you.
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Remundo
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## Re: Photovoltaic connection of PV???

chris34 wrote:well, here is what I thought to load my 3 Strings:

Knowing that the PV Modules are 410 W / ISC = 13,77 A and VOC = 37,45 V

The archi of the 3 PV Fields (positioned on different supports):
1) 4 Modules in series-parallel => 75 V / 28 A
2) 2 Modules in series => 75 V / 13,77 A
3) 2 Modules in series => 75 V / 13,77 A

Hence my question: do you see a wolf in these estimates...?

So for 1)

More precisely, you probably mean the series connection of 2 blocks of 2 modules in //: so OK that gives 2 x 37,5V = 75 V for 2 x 14A = 28A
for a power of 2100 W

You would ideally need a converter with a range of 50-100V for an Imax of 30A

For 2 and 3), power of 1O5O W
The same voltage range, but an Imax of 15A.
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Christophe
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## Re: Photovoltaic connection of PV???

Good with the diagram it's a little clearer but it lacks the orientation of each string...

I am not sure that it is advisable to put 2 regulators on the same battery…

If the orientation of strings 2 and 3 is the same or almost the same, then I advise you to work in series at the pv level with a larger regulator.

To summarize: 1 string, 1 regulator, 1 battery

The more tension there is, the better the pv production, so it is necessary to privilege the strings in series… you will then have 2 almost identical strings.
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chris34
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## Re: Photovoltaic connection of PV???

OK

the technical data of the 2 proposed Charge Regulators (VICTRON 100 / 30A + Victron 100 / 50 A2) are (see file in PJ)
Besides, my fields are not ORIENTED the same: so I forget only 1 REGULATOR for 2 fields ;-)
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Chris34
chris34
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## Re: Photovoltaic connection of PV???

Remindo,

Sorry, but .. I don't understand when you say: IMAX of 30A and IMAX of 15A...? Why ?
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Chris34

Remundo
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## Re: Photovoltaic connection of PV???

well so as not to clip your production or have a risk of breakdown.

It's a small margin of safety.
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izentrop
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## Re: Photovoltaic connection of PV???

chris34 wrote:1) an MPPT 100 / 50 A which will receive 1640 W (1440 W max recommended) => for the PARC2 of batteries
According to the datasheet, it's 1400 W max PV
With 4 pv of 335 Wp in parallel series ... randomly https://allo.solar/panneau-solaire-335w ... solar.html

We get into the nails: 1340 W max, 81.4 V max and 39.4 A
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izentrop
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## Re: Photovoltaic connection of PV???

Rectification before I am corrected, in series the voltage doubles, the intensity does not change, so 2 possibilities:

- With 4 pv of 335 Wp in parallel: 1340 W max, 40.7 V max and 39.4 A
- in parallel series: 1340 W max, 81.4 V max and 19.7 A (with a larger operating range I think and no risk of overheating)
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chris34
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## Re: Photovoltaic connection of PV???

Izentrop,
my PV are 410 Wp (I'm stuck on this because they've been ordered and are arriving... well, I hope!

Remundo,
OK, I understand.....so my solutions:
1) REGUL MPPT 100 / 50A is it OK for your estimates 50-100 V and 30 A ??? (I already have this MPPT 100/50A!)

et
2) REGUL MPPT 100 / 30A is it OK for your estimates 50-100 V and 15 A ??? ( to buy )
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Chris34
Remundo
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## Re: Photovoltaic connection of PV???

apparently their voltage and current ranges are compatible with your panels

however, it appears that they will probably clip the power available from the panels in the event of strong sunlight.
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