Photovoltaic PV connection ???

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Remundo
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by Remundo » 08/07/15, 11:35

watch the friends ...

The current of 15 or 30 A is not the input current, but the output current in 12 or 24V delivered to the battery pack.

In addition, the MPPT range of the Blue Solar 30A is not 100V, but 30 to 80V according to this link found on the fly
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by Remundo » 08/07/15, 11:42

considering the Vmpp 18V on each panel, and to limit the currents (Joule losses) I advise

serialization of 4 parallel associations of 3 panels.

Which will give a nominal voltage in charge of 72V, under 13A

we will not exceed 100V empty (4 x 21.6 = 86.4V), except perhaps in very cold weather ... and still little.
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chris34
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by chris34 » 08/07/15, 15:17

Thank you Gaston

What do you mean by: "conflict of regulations" on the batteries ??
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by Remundo » 08/07/15, 15:24

If you have multiple MPPTs pushing current on a single battery, they can interfere with each other. "interfere" if you want.

But frankly, for even no power 1000W, a single MPPT is fine! And orient your panels the same way too. it must be done in 10m².
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by Gaston » 08/07/15, 15:25

chris34 wrote:What do you mean by: "conflict of regulations" on the batteries ??
Well, connecting multiple controllers to the same batteries can cause problems if they do not have the same charging rules (with the same brand and identical controllers, it should not happen).

For example if one stops at 14V and the other one at 14,5V, the first one can go to safety if the second continues to load.
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by chris34 » 08/07/15, 15:33

hummmmm ... I'm starting to doubt my theoretical knowledge !! :frown:

I have 12 panels. I can connect them in:
1) Gaston way: 3 segments in // of 4 PV in series
ou
2) Remundo way: 4 series segments of 3 PV in //


what difference in the end between 2 scenarios ????
are we not in 2 cases with:
voltage: 21,6 X 4 = 86,4 V
current: 4,88 X 3 = 14,6 A
???????
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by Gaston » 08/07/15, 15:34

Remundo wrote:watch the friends ...

The current of 15 or 30 A is not the input current, but the output current in 12 or 24V delivered to the battery pack.
You are right.

For 12 panels of 80W; either 960W requires a more powerful controller than the 100 / 30 (which only supports 720W).

In this series, the 100 / 50 is suitable if you put 4 panels in series and connecting the batteries in 24V.
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by chris34 » 08/07/15, 15:37

ok Gaston,

if I take 2 regul. 100 / 15 it should do it, but I also feel 1 100 / 30 .... except that Remundo makes me cold in the back; O) !!!
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by Gaston » 08/07/15, 15:46

chris34 wrote:I have 12 panels. I can connect them in:
1) Gaston way: 3 segments in // of 4 PV in series
ou
2) Remundo way: 4 series segments of 3 PV in //


what difference in the end between 2 scenarios ????
are we not in 2 cases with:
voltage: 21,6 X 4 = 86,4 V
current: 4,88 X 3 = 14,6 A
???????
In the result (voltage, intensity), no difference.

The first scheme is in principle more sensitive to drop shadows.

There is probably a little more wiring in the second scheme.
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by Gaston » 08/07/15, 15:50

chris34 wrote:if I take 2 regul. 100 / 15 it should do it, but I also feel 1 100 / 30 .... except that Remundo makes me cold in the back; O) !!!
Remundo is right, you need an 100 / 50.

Or three 100 / 15, in this case separating the 3 segments in parallel.

The advantage of separating the 3 segments is especially if all the panels are not oriented identically (for example 4 Southwest, 4 South and 4 Southeast).
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