Growatt inverter and parallel solar panel wiring

Hidden valley

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Sep 3, 2021
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I have a 5000 growatt grid tied inverter kit from signature solar and I was wondering how many 360W 60Cell Black Mono Solar Panel by Solarever that I can connect in parallel before I go over the amperage allowed by the inverter or mppt?
 

wattmatters

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Apr 16, 2021
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What are the MPPT input specifications of the inverter, and what are the Voc specifications for the panels?
 

Hidden valley

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Here are my panels and my inverter. It doesn't look like I can run panels in parallel unless I connect them to separate inputs on my mppt.


1632508503148.jpeg1632508417480.jpeg
 

schmism

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You really need to spend some time in the beginners corner if have these products on hand and don't understand something as basic as parallel panels increase current and series panels increase voltage.

Presuming you know that's a grid tie only inverter....

That unit has two PV inputs. each input will support 12.5a at 550v.
So a single series string of between 13 and 16 panels is what one input will handle.
 
Last edited:

wattmatters

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Here are my panels and my inverter. It doesn't look like I can run panels in parallel unless I connect them to separate inputs on my mppt.
The inverter is not designed to run panels in parallel, nor is there a need to run panels in parallel.

The inverter has two high voltage (550V) MPPT inputs so you would connect a single string of panels in series to each MPPT.

With a panel Voc of 41.2V, and allowing for some voltage increase in cold conditions, you probably have a safe maximal string limit of 11 panels in series, maybe 12 if you never get all that cold (e.g. 0°C).

20 panels @ 360W = 7200W which is more than ample for this inverter. 18 of those panels is probably a better array size for this inverter.

e.g. that could be 2 strings of 9 or 10 panels in series, each feeding an MPPT input.
 

Hidden valley

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Does it matter is I have different length of electrical runs between panels that are in a series?
 

DaGoose13

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Jul 28, 2021
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Here are the numbers for those panels (was looking at them also). The temps are the cell temp.

C T
F T
VOC
Pmax
Isc
-60​
-76​
51.36​
467.10​
10.70​
-55​
-67​
50.76​
460.80​
10.73​
-50​
-58​
50.16​
454.50​
10.76​
-45​
-49​
49.56​
448.20​
10.79​
-40​
-40​
48.97​
441.90​
10.81​
-35​
-31​
48.37​
435.60​
10.84​
-30​
-22​
47.77​
429.30​
10.87​
-25​
-13​
47.17​
423.00​
10.89​
-20​
-4​
46.58​
416.70​
10.92​
-15​
5​
45.98​
410.40​
10.95​
-10​
14​
45.38​
404.10​
10.97​
-5​
23​
44.78​
397.80​
11.00​
0​
32​
44.19​
391.50​
11.03​
5​
41​
43.59​
385.20​
11.05​
10​
50​
42.99​
378.90​
11.08​
15​
59​
42.39​
372.60​
11.11​
20​
68​
41.80​
366.30​
11.13​
25​
77​
41.20​
360.00​
11.16​
30​
86​
40.60​
353.70​
11.19​
35​
95​
40.01​
347.40​
11.21​
40​
104​
39.41​
341.10​
11.24​
45​
113​
38.81​
334.80​
11.27​
50​
122​
38.21​
328.50​
11.29​
55​
131​
37.62​
322.20​
11.32​
60​
140​
37.02​
315.90​
11.35​
65​
149​
36.42​
309.60​
11.37​
70​
158​
35.82​
303.30​
11.40​
75​
167​
35.23​
297.00​
11.43​
80​
176​
34.63​
290.70​
11.45​
 
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