I've been using the Growatt SPF 5000 ES-US 48 volt inverter since around November of 2021. It's done some strange things lately. It is connected to the Utility. I have 5 of the LifePo4 batteries. I have 2 strings of 2800 watts (14 x 200 watts in series) of panels in parallel. The output source priority is SBU. The charging is Solar only (OSO). Battery type is L1. Voltage back to utility is 20% and voltage back to battery is 40%.
The inverter seems to function according to the settings most of the time, but occasionally, it does something strange.
I've seen it go to utility to run loads when the battery is still showing over 20%--recently the batteries were at 30% when it went to utility. This happened during the night when there was no solar, so it wasn't that it had charged up from 20% to 30% with the solar and was still running the loads off the utility.
I've also seen it charge beyond 40% from the solar and stay on utility--not sure how high it went before it finally went to battery.
Just recently, the inverter used my batteries down to 1% and did not change to utility. I've never seen it do that before. I had to turn the utility breaker off and on to cause inverter to draw from utility, and then it began to power my loads, but it also began to charge my batteries, even though it was set to charge batteries from solar only. This happened several days ago, and it's been working correctly since then.
So, I don't if there is a glitch somewhere or something not programmed correctly. Any ideas?
The inverter seems to function according to the settings most of the time, but occasionally, it does something strange.
I've seen it go to utility to run loads when the battery is still showing over 20%--recently the batteries were at 30% when it went to utility. This happened during the night when there was no solar, so it wasn't that it had charged up from 20% to 30% with the solar and was still running the loads off the utility.
I've also seen it charge beyond 40% from the solar and stay on utility--not sure how high it went before it finally went to battery.
Just recently, the inverter used my batteries down to 1% and did not change to utility. I've never seen it do that before. I had to turn the utility breaker off and on to cause inverter to draw from utility, and then it began to power my loads, but it also began to charge my batteries, even though it was set to charge batteries from solar only. This happened several days ago, and it's been working correctly since then.
So, I don't if there is a glitch somewhere or something not programmed correctly. Any ideas?
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