Just prefacing this with: I searched extensively for the answers I needed, but couldn't find them due to weak google-fu, or it just not being available information. I have a newly installed Sol-Ark 15K on my house that was converted from an Enphase microinverter system as Enphase is super proud of their batteries. Ended up going with the LifePower4 EG4 batteries because the LL2 were out of stock when I pulled the trigger.
The Problem: As the 6x EG4 LifePower4 batteries that were connected to the EG4 Communications Panel and then Sol-ark 15K neared 100%, the PV input would get mysteriously limited and start bouncing around until the batteries reached fully charged. (All reference pictures are days with no cloud cover)
After trying a bunch of settings including telling the Sol-Ark not to communicate and setting battery parameters manually (didn't like that, wasn't accurate and seemed to defeat the purpose of having comms, though it ended up behaving better) I started tinkering with settings on the comms panel. Initially, the comms panel had charge voltage set to 57.6. I lowered this to the 56.4 called for in the battery specification. This yielded the below curves
The Solution: (At least the solution I found after research) Updating the charge voltage on the communications panel to 55.7 altered the behavior to be as expected. After the 'average' hit 99.5ish%, the inverter reduced power heading to the batteries and put it into the grid and has slowly brought up each battery to 100%. (A couple are at 99.7, will see if adjusting this 55.7 up to 55.8 or 55.9 resolves this on another sunny day)
And a question for the EG4 folks. Can we get an update to the communications hub to set absorb and float voltage separately? Only having the one entry point tells Sol-Ark that all 3 are the same.
The Problem: As the 6x EG4 LifePower4 batteries that were connected to the EG4 Communications Panel and then Sol-ark 15K neared 100%, the PV input would get mysteriously limited and start bouncing around until the batteries reached fully charged. (All reference pictures are days with no cloud cover)
After trying a bunch of settings including telling the Sol-Ark not to communicate and setting battery parameters manually (didn't like that, wasn't accurate and seemed to defeat the purpose of having comms, though it ended up behaving better) I started tinkering with settings on the comms panel. Initially, the comms panel had charge voltage set to 57.6. I lowered this to the 56.4 called for in the battery specification. This yielded the below curves
The Solution: (At least the solution I found after research) Updating the charge voltage on the communications panel to 55.7 altered the behavior to be as expected. After the 'average' hit 99.5ish%, the inverter reduced power heading to the batteries and put it into the grid and has slowly brought up each battery to 100%. (A couple are at 99.7, will see if adjusting this 55.7 up to 55.8 or 55.9 resolves this on another sunny day)
And a question for the EG4 folks. Can we get an update to the communications hub to set absorb and float voltage separately? Only having the one entry point tells Sol-Ark that all 3 are the same.