At first glance, checking the maximum voltage and current allowed for the P320 optimizer, it may appear that the LG335N1C-A5 module and SolarEdge P320 optimizer are compatible.
Voc = 41.0V
Isc = 10.49A
TcVoc = -0.27%/C
TcIsc = 0.03%/C
Max input voltage = 48V (Voc @ low temp)
Max input current = 11A (ISC @ high temp)
Even at some fairly extreme temperatures, the LG335 panel’s voltage and current output will remain under the 48V and 11A limits of the P320. However, SolarEdge also declares a maximum power rating for connected panels that must be considered.
SolarEdge specifies the maximum STC power rating of allowed modules as seen in the table below. Note the maximum allowed power rating is simply the numeric value contained within the optimizer’s name, i.e. P320 = ≤320W module power.
Power Optimizer Model
+5% Tolerance Allowed
If the allowed +5% power tolerance is considered, the P320 optimizer should actually be able to accommodate a 320W + 5% = 336W panel, and the LG335/P320 combination starts to look possible again. However, the positive power tolerance for the LG335 is +3%, and could yield a 335W + 3% = 345W output, and would exceed even the calculated maximum capability of the P320 optimizer.
Therefore, the LG335N1C-A5 module is NOT COMPATIBLE with the SolarEdge P320 optimizer. This conclusion is also confirmed by the SolarEdge Designer tool at www.solaredge.com.
SolarEdge Support can be reached by visiting https://www3.solaredge.com/service/support or by calling 1-510-498-3200.
If you have any question on this topic, you are welcome to call us at 855-755-5855 or email the RENVU team at firstname.lastname@example.org.