Need Help - MMP Solar off grid inverter

[natesdiy]

I've been stuck for hours figure out what off grid inverter I need.

I currently have 8 x 185w solar panels, specs below.

I was looking at the 2.4kw PIP-2424MSE1 link below, Looking at the specs I don't think it will support my panels.

Max Power - fmax- 185w
Voltage Max Vmp- 37.2v
Current at Pmax - 4.97A
Open circuit voltage - 44.5
Short circuit current- 5.54a
72 cell
Max system voltage 1000w

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[JoeHam]

Somebody asked this same question yesterday.

For your panels make 4 pairs in series. That will give you Vmp of 74.4v per pair. Current will be 4.97a.

Next, put those 4 pairs in parallel. The Vmp will stay at 74.4v and the current will be 19.88a.

Your link states that the MPPT controller part of your all in one can handle max of 105v and 40a.

Since your total voltage of 74.4v is less than 105v that works.

Since your total current of 19.88a is less than 40a that works.

Am I missing something?

 

[tictag]

Firstly, can I just make sure that you are OK with a European mains output voltage i.e. 230Vac. A lot of people on this forum are states-side.

The most important specs from your SCC are: Maximum PV Voltage (105V) and Maximum PV Power (missing!). We can infer the missing parameter using Maximum Charge Current 40A delivered at 24V, or 960W. The MPPT efficiency parameter is also missing so let's assume 95%, so your Maximum PV Power is 1,008W. Your array at 1,480W (8 x 185W = 1,480W) is, therefore, not supported by this unit.

It doesn't matter how you connect your panels, at best, the SCC will dump any excess power as heat, worst case the SCC will fail.

You could connect 5 x 185W for 925W, or risk out-of-spec usage at 6 x 185W = 1,110W.

If you went for 6 panels, your series string would be restricted to a maximum of two panels (2 x 44.5V = 89V, which is OK, but 3 x 44.5V = 133.5V BUST!), the rest in parallel strings for 2S3P.

Imho, with such an array, I'd be looking for a better spec'd all-in-one. For example, Victron's EasySolar 2.2kW model supports up to 150V and 2,000W on the input. Other manufacturers are available.

Edit: Corrected typo.

 

[tictag]

Your link states that the MPPT controller part of your all in one can handle max of 105v and 40a.

That 40A is delivered at 24V i.e. on the battery side.

 

[JoeHam]

That 40A is delivered at 24V i.e. on the battery side.

You are correct. I was missing something!