Doin it
Member
- Joined
- Mar 17, 2019
- Messages
- 331
Could use some help figuring this out. I have an fm60. Its supplying 3200w max sustained, array is new panels 3660w, 99.9vmp, 120voc, 36amps I observe the input voltage not going higher than 80ish volts most of the time when it should be capable of 99v. It does show 99v and higher input on the screen rarely but I think this is only when input amps are low. Also I do rarely see 3600w but its only for a few seconds. When solar should be at it peak-highest production I cant get anymore than 3200w sustained from the array.
My thoughts are that maybe the chargecontroller combines the battery voltage (16s 65.6v max) with array voltage, and will not let the input volts from array be higher than the difference between 150v (max allowable array input voltage for charge controller) and the batteries present voltage? Is this how its done by the charge controller? If it is, that could be why Im not seeing closer to the voltage that should be available from panels.. I hope this isnt correct,, 66v (2 panels in series) wasnt enough volts to charge 16s battery so I needed 3 panels in series for 99v but if I cant use all the arrays power that would be a huge bummer. 99v from array and 65.6v from battery would be 164.6v which might be why input array volts is being lowered-not accepted? When the battery is at 58ish volts then I also see higher input voltages around 100v.
My thoughts are that maybe the chargecontroller combines the battery voltage (16s 65.6v max) with array voltage, and will not let the input volts from array be higher than the difference between 150v (max allowable array input voltage for charge controller) and the batteries present voltage? Is this how its done by the charge controller? If it is, that could be why Im not seeing closer to the voltage that should be available from panels.. I hope this isnt correct,, 66v (2 panels in series) wasnt enough volts to charge 16s battery so I needed 3 panels in series for 99v but if I cant use all the arrays power that would be a huge bummer. 99v from array and 65.6v from battery would be 164.6v which might be why input array volts is being lowered-not accepted? When the battery is at 58ish volts then I also see higher input voltages around 100v.