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Topic starter
January 26, 2026 3:07 am
I just switched over to an EG4 18Kpv from a new Growatt SPH10000 that had issues. Prior to that I had an off grid setup for 17 years around the Outback VFX3648 inverter with Outback charge controllers, the HUB, the FNDC, and the MATE3. My Outback set up worked well, but was well undersized from my needs for the past 10 years. Turns out the EG4 18Kpv has some issues and I hope to get those ironed out tomorrow with tech support. For instance, this morning with snow overnight, the inverter shut down due to low voltage below my generator settings that were to prevent that. I hope it has nothing to do with my battery bank of 7 SimpliPHI 3.8 52.1v M batteries because I do not want to buy new batteries to replace these that have only been in service for 2.5 years. I do have the inverter set up for voltage instead of SoC.
January 26, 2026 7:58 pm
I got the Battery low voltage message and it stopped charging my battery after 80%.
Do we get this kind of behavior in cold conditions, like a temperature of 20°F?
This post was modified 1 month ago by rmanam
Topic starter
January 26, 2026 10:46 pm
I did get a NOTICE but had been monitoring the voltage so I knew why it shutdown. The NOTICE cleared after the sun came up and the inverter restarted.
January 28, 2026 6:31 pm
@mtjag
Do you know what the voltage was on the batteries when the inverter shut down?
January 28, 2026 10:48 pm
Topic starter
January 29, 2026 1:58 am
@eg4eric yes and it was tested by combining the two wires and it worked.
Topic starter
January 29, 2026 2:11 am
@eg4eric a couple of other things to add regarding the generator. My installer was able to do the "Start GEN Exercise" using the button on the app yesterday. Then today, I inadvertently turned the battery breaker off and immediately we lost power to the house and the generator started. The generator ran for a one minute warm up and I heard a click, but it never started charging or supplying energy to the house loads. Now, the voltage was above the Charge end voltage of 53.5v so that may have been the issue. I switched the battery breaker back on and after about another minute the generator automatically shutdown. I just need to know the generator will come on at the correct set point and charge the batteries/run loads.
Topic starter
January 31, 2026 10:26 pm
@eg4eric, since I am completely off-grid, I really need to find out if the generator will run based on voltage set points for the generator. Do I do this by adjusting the generator charge start voltage within the range of the current battery voltage to see if it starts the generator and charges, or is there a better way? Thanks.
February 6, 2026 5:01 pm
@mtjag
Are you communicating between the inverter and the batteries or are you charging and discharging based off of voltage?
Topic starter
February 19, 2026 2:35 am
@eg4eric I'm using voltage...no comms. I've got the generator figured out now, thanks.
February 23, 2026 10:25 pm
Yes, you would need to set the Charge start Voltage setting. Once the battery goes lower that the set parameter, the generator will begin to charge the battery.
Topic starter
February 28, 2026 1:08 am
After a month of trying to get an accurate answer from EG4, it appears the accurate answer is that the EG4 18Kpv does not support being able to set an Absorb time with either Lithium or FLA batteries. I've returned home twice now over the past 10 days to find my SimpliPHI 3.8 52.1v battery bank has been stuck in Absorb for 3 to 4 hours. The SimpliPHI batteries I have has a BMS, but no comms. I was told earlier by an EG4 tech, I could set the Absorb, but it turns out that can't be done. So, before I return this inverter, I'm looking for a 3rd party solution so that my battery bank can be managed properly. Ideally, a 3rd party that can communicate with the inverter and end the Absorb charge in 6 minutes as per SimpliPHI as opposed to running Absorb for hours.
