Large Panel array help. 290W panels. 4.0kW array

[wtrey613]

So I am doing calcs with a Growatt 3000W 24v inverter. and 2x 6.0kw batteries (240AH - 6KWH).

I could use some feedback on my calcs/array setup.

15x 290W suntech Panels
Configuration 3s5P.

So the grow watt should handle up to 145Volts. Max solar charge current for growatt says 80Amps.
Is this array too much for the growatt to handle?
and what are the advantages/disadvantages to large arrays or even 2S7P?

 

[snoobler]

Growatt can only handle about 2000W of charging from solar.

You need to allow for cold weather influence on panel Voc. 3X 72 cell panels in series are generally not regarded as safe for SCC with PV voltage limit of 150V.

2S7P is the better choice.

I don't know how tolerant the Growatt is when over-paneling.

 

[wtrey613]

OH my goodness. that's right, so my solar array is above 2000w, is there a way to put two growatts in tandem and would that up the wattage capacity for the solar array input?
If not, it looks like i will have to upgrade the whole inverter/batteries/ system to 48 volts then?

Right now, with 2S7P or 2S6P, my open VOC is under 145v, with the temperature at -20c. so thats fine then.

Thanks again for your help, much appreciated. if you do consulting let me know.

 

[snoobler]

Many of the Growatt can be operated in parallel to produce additional 120VAC power or operate in 120/240VAC split phase and utilize the additional charge controller to expand the array. Check the specs for your unit to confirm.

You would then have 2X 2S3P arrays, 1 on each Growatt. It could even be imbalanced with 2X3P on one and 2X4P on the other.

While I don't know how tolerant the Growatt is of overpaneling, it's likely not an issue if you keep it under about 120-130% of the SCC's rating, i.e., if it says 2000W, 2000-2600W is almost certainly safe.