We struggled for 3 weeks at least trying to troubleshoot the reason why watts on PV output fluctuates drastically during load.
I have 3 Voltronic Infinisolar V IV hooked in parallel
28 Longi panels 545w
inverter1, 7 in series
inverter2, 7 in series
interter3, 7 in series+7 in series
During high load, i can see PV power on the 3 inverters fluctuates, 3300w suddenly drops down to 200w for 3 seconds and then go back to 3300w, drops are high, random amounts of watts and almost continuous.
The drops will reduce if i power off 1 inverter and keep only 2 in parallel, drops will vanish completely if i power off 2 inverters and keep only 1 inverter.
Reviewed all connectors, all cables, thickness, earth, etc... everything is as per recommended standards, max cables length is 30m, used 10mm DC cables.
It worth to mention I was having Growatt inverters on the same setup and cabling without a single drop.
After contacting Voltronic, they recommended adding 3.3uf 600v DC capacitors on the PV ends at the inverter's connector side. I found 400v 3.3 uf DC and installed them, they resolved around 80% of the problem, fluctuation is still there by around 20% but not completely resolved.
Anyone faced such a problem or have an opinion what could be the problem or solution?
I have 3 Voltronic Infinisolar V IV hooked in parallel
28 Longi panels 545w
inverter1, 7 in series
inverter2, 7 in series
interter3, 7 in series+7 in series
During high load, i can see PV power on the 3 inverters fluctuates, 3300w suddenly drops down to 200w for 3 seconds and then go back to 3300w, drops are high, random amounts of watts and almost continuous.
The drops will reduce if i power off 1 inverter and keep only 2 in parallel, drops will vanish completely if i power off 2 inverters and keep only 1 inverter.
Reviewed all connectors, all cables, thickness, earth, etc... everything is as per recommended standards, max cables length is 30m, used 10mm DC cables.
It worth to mention I was having Growatt inverters on the same setup and cabling without a single drop.
After contacting Voltronic, they recommended adding 3.3uf 600v DC capacitors on the PV ends at the inverter's connector side. I found 400v 3.3 uf DC and installed them, they resolved around 80% of the problem, fluctuation is still there by around 20% but not completely resolved.
Anyone faced such a problem or have an opinion what could be the problem or solution?