Growatt SPF 5000 ES and AGM voltage Glitch

[BartHenry]

I have a strange glitch... randomly thru out the day ( and night) my Growatt SPF es (2 of them) will switch to AC in, and then back to solar and or battery, for just a split second. The units are not showing any faults, but its enough to trip the lights and such. I am using 12 200AH AGM batteries (600ah @48v), and 8.4 kw of solar. Any suggestions???
thanks

 

[sunshine_eggo]

Heavy surge load causing DC voltage sag?

 

[BartHenry]

I could see that at night, but it does it in full sun, without using any battery, just solar

 

[sunshine_eggo]

I could see that at night, but it does it in full sun, without using any battery, just solar

Surge loads can easily exceed both inverter and PV input on these lightweight inverters. Are you driving an HVAC unit with it?

 

[BartHenry]

Nope, and my highest draw has been 1500 watts

 

[sunshine_eggo]

Strange indeed! I'd reach out to your vendor for support.

 

[timselectric]

What mode is the inverters set to?
This would be expected in "solar first ".
But not in "SBU ".

 

[BartHenry]

What mode is the inverters set to?

Sbu, charge from solar only. I currently have no 240v loads hooked to it, just 120v

 

[timselectric]

Sbu, charge from solar only. I currently have no 240v loads hooked to it, just 120v

Transformer?

 

[BartHenry]

Transformer?

Transformer?

Thats kinda what I'm thinking, for some reason the neutral is dropping out for a split second... just don't know why.

 

[timselectric]

What type of transformer do you have?

 

[BartHenry]

Growatt auto transformer.

 

[timselectric]

Losing the neutral wouldn't affect the inverter.
Would only be a problem for what is being powered.
Do you have any monitoring in place?
It could show what's happening at the time of the incident.

 

[BartHenry]

I have a sense home monitor. I will be getting solar assistant shortly.

 

[timselectric]

Solar Assistant will be very helpful in these situations.

 

[BartHenry]

Should I also get something like the victron smart shunt, since I have AGM batteries

 

[timselectric]

It's not as important with AGM, because voltage is a good indication of SOC. But, it's something that I personally would add.