RoySalisbury
New Member
- Joined
- Apr 24, 2022
- Messages
- 136
I understand that when you mix panels of differing voltage and/or current that you only get the minimum of the mixed panels. For example:
45v + 40v = 80v ...
or
8a + 9a = 16a
But what numbers should you use to determine the Voc or Isc of the string? Do you add them up "as they are marked" or do you use the lower Voc of the string?
For example, if have
12 330w panels @[45.83 voc, 37.70 v nominal, 9.27 Isc, 8.76 a nominal]
6 320w panels @[49.5 voc, 40.1 v nominal, 8.6 Isc, 7.99 a nominal]
I'd like to keep the volts as high as I can (within supported hardware) due to cable length, so that would be 450v/27a (6000w). That means a 9x2 array.
6 [330w] + 3 [320w] = [(45.83 *6) + (49.5 * 3)] = [274.98 + 148.5] = 423.48 Voc (for max voltage support)
current would be 9.27a Isc
and
6 [330w] + 3 [320w] = [(37.70 * 6) + (40.1 * 3)] = [226.20 + 120.3] = 346.5 V nominal (to determine yield)
current would be 7.99a nominal
Yield: (346.5 * (7.99 * 2)) = 5537.07 w (a loss of about 1 full panel over rated)
Would this be correct, or should I be looking at things different?
45v + 40v = 80v ...
or
8a + 9a = 16a
But what numbers should you use to determine the Voc or Isc of the string? Do you add them up "as they are marked" or do you use the lower Voc of the string?
For example, if have
12 330w panels @[45.83 voc, 37.70 v nominal, 9.27 Isc, 8.76 a nominal]
6 320w panels @[49.5 voc, 40.1 v nominal, 8.6 Isc, 7.99 a nominal]
I'd like to keep the volts as high as I can (within supported hardware) due to cable length, so that would be 450v/27a (6000w). That means a 9x2 array.
6 [330w] + 3 [320w] = [(45.83 *6) + (49.5 * 3)] = [274.98 + 148.5] = 423.48 Voc (for max voltage support)
current would be 9.27a Isc
and
6 [330w] + 3 [320w] = [(37.70 * 6) + (40.1 * 3)] = [226.20 + 120.3] = 346.5 V nominal (to determine yield)
current would be 7.99a nominal
Yield: (346.5 * (7.99 * 2)) = 5537.07 w (a loss of about 1 full panel over rated)
Would this be correct, or should I be looking at things different?