BMcL
Solar Enthusiast
- Joined
- Sep 5, 2021
- Messages
- 834
The write-up at watts247 explains how to arrange your array. Or you can buy an external solar controller:
Solar Panel Configuration:
120A (7kW) Solar MPPT Charge controller (60Vmp to 245Voc) – Max 250V
Number of panels you can connect = 7000W / [your panel wattage] – example 7000 /345W = 20 panels , 7000 / 240W = 30 panels etc
if your Solar panels’ Vmp (Voltage at maximum power – the lower of the two numbers on your panel spec) (Not Voc) voltage is between 38.3 V and 57.5V, you can connect 4 in series with matching parallel strings to add up to the number of panels as in formula above. 20 x 40V panels would be connected in 4s3p (12 panels) on one input and 4s2 (8 panels) on the other
If your Vmp is between 28.75V and 38.3V you can connect 5 in series with matching series strings connected in parallel to add up to the number of panels as in formula above. example: 30 x 35V panels would be connected in 5s3p on each PV input (15 panels each)
If your Vmp is between 17V and 28.75V, then 6 in series with matching series strings connected in parallel to add up to the number of panels as in formula above. example 72 x 20V panels(maybe 100W) would be 6s6p (36 panels) – but remember there a 2 PV inputs so each input will be 6s6p and 6s6p
Solar Panel Configuration:
120A (7kW) Solar MPPT Charge controller (60Vmp to 245Voc) – Max 250V
Number of panels you can connect = 7000W / [your panel wattage] – example 7000 /345W = 20 panels , 7000 / 240W = 30 panels etc
if your Solar panels’ Vmp (Voltage at maximum power – the lower of the two numbers on your panel spec) (Not Voc) voltage is between 38.3 V and 57.5V, you can connect 4 in series with matching parallel strings to add up to the number of panels as in formula above. 20 x 40V panels would be connected in 4s3p (12 panels) on one input and 4s2 (8 panels) on the other
If your Vmp is between 28.75V and 38.3V you can connect 5 in series with matching series strings connected in parallel to add up to the number of panels as in formula above. example: 30 x 35V panels would be connected in 5s3p on each PV input (15 panels each)
If your Vmp is between 17V and 28.75V, then 6 in series with matching series strings connected in parallel to add up to the number of panels as in formula above. example 72 x 20V panels(maybe 100W) would be 6s6p (36 panels) – but remember there a 2 PV inputs so each input will be 6s6p and 6s6p