Rover PV overvoltage

[ReadyKiloWhat]

My rover 40A does PV overvoltage occurs every day, all day. The conditions here at my house at latitude N43.5 degrees, are cloudy with temperatures recently from 0° C to 10° C. If there was an actual PV overvoltage, the manual indicates that the fault should clear when the voltage falls below 100VDC. It does not reset until the voltage is disconnected from the Rover and then it quickly returns to fault mode again when it is reconnected with 4 pv panels. I have measured the PV voltage everyday and it has not gone above 100 VDC as measured with the Rover and a seperate DVM. I would be willing to calibrate the Rover's PV panel high voltage limit if I could access a calibration menu. Renogy says to change configuration to series parallel. however my identical old rover 40 amp does not have PV overvoltage fault. whats up?

 

[LakeHouse]

What's the open-circuit voltage (Voc) rating on your panels? And how many do you have in series?

 

[ReadyKiloWhat]

What's the open-circuit voltage (Voc) rating on your panels? And how many do you have in series?

24 VDC. I have 4 in series. the total voltage OC is 96.3 VDC. That is less than the 100 VDC limit that Renogy specs. further Rover does not reset itself. The Rover reports nearly the same voltage as my two different voltmeters and still under 100 VDC. Renogy giving me a song and dance saying to reconfigure to 2p2s saying it is more efficient. BS

 

[mikefitz]

total voltage OC is 96.3 VDC

It will be higher with cold panels.
Regardless of measurements, the series panel array is producing too high a voltage for this Renogy Rover you have. Your options are to rewire the array series parallel or get another controller, idealy a model with a 150 input voltage limit.
There is going to be a tolerance on the actual overvolt detection in the unit.

saying to reconfigure to 2p2s saying it is more efficient

It's probable the conversion efficiency is higher at the lower voltage. Also since the controller will be actually working correctly, its guaranteed to be much more efficient !