I have a 5kw mecer Inverter with 4 x 325w panels in series 150v.

the issue is the watts from the pv is not feesing constantly to the batteries or the load the volts stays constant at 150v but the wats jumps from 0w to 990w the again and again.

why would it do this when there is a constant load and batteries to charge 

Edited August 20, 20215 yr by BattleNan8404

Just from my observation on my config - my watts and voltages from PV aren't static. My volts go up and down along with my wattage depending on what's going on with the star feeding it. 

What is your inverter specs? Max PV voltage? You don't happen to have one of those with a 145v max 115v max? Perhaps a parallel or combination panel config would be better?

Disclaimer : I'm also new to this and the above is based on observation of my own setup

Edited August 20, 20215 yr by JoeyhZA

Hi I have the 450VDC 5kw Inverter 

I have 4x325w panels in one string @150vdc and should be 1.3kw pv

but keeps on fluctuating and dont know why.

my load is 280w and batties charge at 20a but does not keep stable 

7 hours ago, BattleNan8404 said:

I have a 5kw mecer Inverter with 4 x 325w panels in series 150v.

150 VDC is too high for the 145 V max solar charge controllers, and too low (most of the time) for the 120-430 V models. As soon as you draw power from the panels, the voltage will drop well below the 150 V (assuming that's an open circuit voltage). The minimum MPPT voltage for those models is usually about 120 V. My guess is that the panel voltage is dropping below 120 V under load.

I'd say you need to add another panel, or possibly two, to get the voltage high enough to reliably run the high voltage solar charge controllers.

42 minutes ago, Coulomb said:

150 VDC is too high for the 145 V max solar charge controllers, and too low (most of the time) for the 120-430 V models. As soon as you draw power from the panels, the voltage will drop well below the 150 V (assuming that's an open circuit voltage). The minimum MPPT voltage for those models is usually about 120 V. My guess is that the panel voltage is dropping below 120 V under load.

I'd say you need to add another panel, or possibly two, to get the voltage high enough to reliably run the high voltage solar charge controllers.

Hi I checked the Voltage does not go below 140VDC but the watts keeps on goung to 50w and 900w then down again.

I will add another 4 panels in series and see if the problem is resolved.

thank you for the advice