bobbiecool
New Member
Hi. I had installed last November a Growatt SPH5000 inverter, a Growatt 6.5kw battery and 18 Eurener 28v 410w panels, 2 strings of 12 and 6. I encountered a problem last week when I noticed spiking from lunchtime to sunset, these were hot cloudless days. I assumed it was too much voltage coming in from the grid, however after talking to UK Power Networks they assured me voltage was normal all week coming in to my property. I contacted Growatt (who are always very helpful) and from the info I gave them and the readings they can see at their end they said the voltage required to generate power on the string of 6 panels was not enough, it was tip toeing around 150v (the minimum required) and would also drop well below that. After some investigation I read that in hot sunny days panel voltage can drop, hence my issue
. An electrician was sent out to investigate yesterday, he volt tested each panel on the 6 string and they each came out at 24v, and not 28v which they should have been, which obviously made things much worse.
My question is what sort of voltage drop should one expect in the summer, and shouldn't there be a minimum voltage to compensate for the drop?
Any help would be appreciated.
. An electrician was sent out to investigate yesterday, he volt tested each panel on the 6 string and they each came out at 24v, and not 28v which they should have been, which obviously made things much worse.
My question is what sort of voltage drop should one expect in the summer, and shouldn't there be a minimum voltage to compensate for the drop?
Any help would be appreciated.