SOC meter is now reset. I would hold it there for a day or so.
EG4 batteries not charging to 100%
- Thread starter ChuckHomeLab
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Quattrohead
Solar Wizard
Yep that is looking much better and typical of how they will react at full.
You can knock those charge and float voltages down a bit now, try 56 for charge and 55.4 for float.
You can knock those charge and float voltages down a bit now, try 56 for charge and 55.4 for float.
BarracudaBob
Harnessing big fusion reactor in sky
I had a similar issue of one battery only charging to 89% so I just did the firmware update (may 2024) and now it goes to 100% but the voltage doesn't. Note they are all in parallel in the cabinet. Fix one problem and the next pops up.
timselectric
If I can do it, you can do it.
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It's always something. lol
marionw
Solar Enthusiast
Look at thread https://diysolarforum.com/threads/sungoldpower-10kw-with-eg4-lifepower4-batteries-closed-loop.83930/
Not to toot my horn but at this moment I am charging 6 LifePower4 batteries from grid and trying (at least trying) to document what the actual charging process is.
Not to toot my horn but at this moment I am charging 6 LifePower4 batteries from grid and trying (at least trying) to document what the actual charging process is.
Ampster
Renewable Energy Hobbyist
My only guess is that one battery disconnected because of a high cell and now it has settled while it was disconnected and the others are still at absorb or float. After some time did that one reset and join the others? In parallel they should all be at the same voltage. Do you have access to individual cell voltages within each battery, or some way to test my hypothesis?
OffGridForGood
Catch, make or grow everything you can.
or see if the BMS has switched off Charging due to a high voltage cell hitting the HV cut off?
wpns
Solar Joules are catch and release
I’m with Ampster, you can’t have batteries in parallel with any decent interconnect and have different voltages.
timselectric
If I can do it, you can do it.
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Voltage is the great equalizer.
marionw
Solar Enthusiast
What make/model of EG4 batteries do you have and what Inverter or charger are you using?
BarracudaBob
Harnessing big fusion reactor in sky
I agree that something had to disconnect otherwise the voltage would have to be the same being in parallel with the other batteries.
I also just installed the EG4 LiFePOWER4 Communications Hub this weekend. I believe it reads the batteries every 3 minutes. I haven't played with that feature yet.
Right now I have the EG4 3kW on it. Getting ready to parallel 2 together. I have two more batteries to install in the cabinet too. Charging set for 56.2/54.0 right now.
BarracudaBob
Harnessing big fusion reactor in sky
I downloaded the Hub data on battery #4. The Communications Hub is doing what it is supposed to do. This is the only battery that isn't happy. Just passed 1 year old. Data attached.
Cell Voltage difference peeked at this point
Cell Voltage difference peeked at this point
| Max | Min | Delta |
| 3.58 | 3.4 | 0.18 |
Last edited:
EG4_Jared
Online Support for EG4 Electronics
I would recommend isolating the battery at 54.5v and separately charging this until it reaches the correlating voltage of the other three. Once this is done, reintroducing the fourth battery to the pack to see if this is corrected.
underdog5004
New Member
I had an issue recently with soc drifting. One out of six batteries was showing only 78ah stored, with total capacity at 99.8ah. The low battery was at th3 same voltage as the high batteries. I disconnected all but the low battery, and ran some big loads on my system. Battery showed 0% soc at...51.5v I think. I kept the (30-60a) loads going until voltage dropped to 48v. As it recharged, the soc was more in line with it's brothers.
I want to point out that I charged the single battery up to 51v, then turned on the other (54v) batteries, one at a time, while monitoring the low battery with a clamp meter, and I never saw more than 30a going into the low battery. Doing this is usually recommended against, but I wanted to see what would happen. No bangs, no smoke,
Figuring the rest of the batteries might have drifted, I brought the whole bank down to 48v over the last few days, and am (slowly) recharging back to full. Despite the weather reports, the clouds moved in
I want to point out, my house idles between 200-400w, which might be too low of a draw for the batteries to register, leading to this soc drift. They usually are charged to 100% every day (55.6v 1.5hr absorb for balancing, float at 54.0v), and almost never drain below 75%.
I want to point out that I charged the single battery up to 51v, then turned on the other (54v) batteries, one at a time, while monitoring the low battery with a clamp meter, and I never saw more than 30a going into the low battery. Doing this is usually recommended against, but I wanted to see what would happen. No bangs, no smoke,
Figuring the rest of the batteries might have drifted, I brought the whole bank down to 48v over the last few days, and am (slowly) recharging back to full. Despite the weather reports, the clouds moved in
I want to point out, my house idles between 200-400w, which might be too low of a draw for the batteries to register, leading to this soc drift. They usually are charged to 100% every day (55.6v 1.5hr absorb for balancing, float at 54.0v), and almost never drain below 75%.
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