Hi all, i have a weird issue that started 2 months back and getting more regular. I first noticed that when loadshedding occurs and my inverter (Growatt SPF5000TL) switches from utility power to battery/inverter mode, the inverter reboots automatically. This seemed odd but ok as when it reboots it came up again fine and starts feeding the house load again. Then last month, when loadshedding kicked in and the inverter switches again, it rebooted came up BUT now would not supply the house load. The load would kick in for 2 seconds, output voltage go up and then die. Inverter will still be on, batteries at full charge but it wouldnt hold the load supply. But every minute or so, it would try kick in the load again and die. Complete manual restarts and battery resets doesnt work. The ONLY way the inverter picks up and feeds the load again is when utlility supply is resumed. Its like the additional voltage from the utility power jump starts it again. This started intermittent but becoming more regular.
Interesting to note, is that it seems to only happen when the inverter is being supplied by Utility and loadshedding occurs and it has to switch over to battery. During the day when it's on SOL primary and utility doesn't supply or effect the load at all, even if loadshedding occurs it works as per normal. Also if I switch my inverter off completely and try start it up again, it presents the same issue IF i don't have Utility power present to start it up. So I can reproduce it that way. It won't supply load directly straight off the batteries, even in full charge.
I run SOL mode, so full PV and batteries during the day, then it switches to utility after sunset unless theres loadshedding, then I run off battery till power resumes. I feel like its an inverter issue, maybe specifically with the capacitors, possibly faulty? Ive had the inverter just under 3 years now.
Anyone experienced this or heard of similar issues? Thank you.