EG4 wall mount batts (4) go from 54% SOC to 0% at night when set to go down to 30%

[455dan]

^^^ I have been following Will Prowse " It's not that Bad" video to use your LiFePo4 batteries recommendation and using the full range of SOC/charge discharge when the sun allows it. I did set a 1% reserve and that is where it sits this morning and is reading 51.2V, but it is going to be a sunny day.

 

[wpns]

I want the Will Prowse "It's Not That Bad" T-shirt!

 

[455dan]

It's not that bad but, I need more battery!

" Why Buy a system and not use it? The most battery capacity you have available is Today- You should Use it."

I have learned a lot from these two videos. LiFePo4 is So different from the NCA in the EV.

 

[Michigan Solar and ESS]

There is a thread on the EG4 forum I started a while ago you may find interesting. One item I found that seemed to cause problems was the Weather Optimization. In addition to disableing I did upgrade to the FAAB-2122 firmware build. I've tried to keep my settings somewhat basic but am running Peak Shaving and the following battery settings.

Page 3 | 18kPV settings mysteriously change after "Start Qui...

Page 3 | Repeatable scenario: I have my 18kPV configured for AC Charging based on Voltage. Prior to a storm we will often use the "Start Quick Charg...

forum.eg4electronics.com

 

[455dan]

There is a thread on the EG4 forum I started a while ago you may find interesting. One item I found that seemed to cause problems was the Weather Optimization. In addition to disableing I did upgrade to the FAAB-2122 firmware build. I've tried to keep my settings somewhat basic but am running Peak Shaving and the following battery settings.

View attachment 320391

Page 3 | 18kPV settings mysteriously change after "Start Qui...

Page 3 | Repeatable scenario: I have my 18kPV configured for AC Charging based on Voltage. Prior to a storm we will often use the "Start Quick Charg...

forum.eg4electronics.com

Interesting, I have never used the weather optimization or peak shaving options. When there is news of an incoming storm I sometimes use the quick charge and then turn it off before the storm arrives if the batteries are low.

So the special program actually caused more problems than it fixed,? Happy to still be running FAAB 1616


Basics first EG4 ,_______ First , "Do no Harm" should be the firmware update Golden Rule for all of these AIO's

 

[fnnwizard]

55.5v seems a long way from 57v. I take it to 25% nightly and that is reading 51.9V (3.249min-3.251max), what definition of 'full discharge' voltage are you saying to do? EG4 18kPV seems to have a limit of 20% minimum SOC.

I am assuming the BMS protection will protect the battery if any cell gets to 2.7v.
SOC has a limit of 20%, below that, it gives an error. I and hesitant to change it back and forth between Li and lead-acid mode all the time as the end user on a production system.

There's 2 ways to get V higher in coms mode.
1. increase SOC beyond 100%, but you have to monitor how high V goes.
2. in closed loop, you can still run in V mode. This to me is the best of both worlds, but there is 1 caveat you need to be aware of and that is the 18kPv has a hardcode ( non settable) to go to grid and ac charge @500W when batts are <10%. it will charge to 13% via grid and batts go on standby.

It will wait to use PV to charge up to 15%, where only then, it's back to normal mode.

So switch to Voltage in comms mode and set your (3 settings) bulk to say 56.6 and float at say 56.4. System V needs to be higher than 56.6.

Float at 54.4 after your packs are reasonably balance. If you have plenty of PV and pack is charged early enough, float at 54.

 

[rogerheflin]

Interesting, I have never used the weather optimization or peak shaving options. When there is news of an incoming storm I sometimes use the quick charge and then turn it off before the storm arrives if the batteries are low.

So the special program actually caused more problems than it fixed,? Happy to still be running FAAB 1616


Basics first EG4 ,_______ First , "Do no Harm" should be the firmware update Golden Rule for all of these AIO's

I am not sure short term (3-4 hours in advance) weather optimization can work given the current state of forecast accuracy.

I manually try to do it and more often than not the forecast is so bad as to basically be useless. I have too many predicted sunny, and ends up horribly cloudy, and other predicted cloudy and super sunny. i have my charging setup to only kick in at 2:30pm if my current SOC is not likely to be enough to make it through the expensive 4-8 period. Too many times I have charged earlier (say before noon) just to have the sun show up and make me not need the grid charging at all. I have given up on charging the batteries with grid unless there is a severe storm predicated, or if I don't have the min battery to make it through the peak 4-8pm time.

I don't think the weather optimization is in the firmware, I think it is being operated from the website itself.

 

[mjcother]

So I made the switch to Lead-Acid mode, because "Closed-Loop Voltage" did no better than "Closed-Loop Voltage SOC"...

The voltage displayed instantly jumped from 55.3at 17:05 to 58 at 17:09
WTF?

For giggles, I switched it back to "Closed-Loop Voltage" and the voltage dropped back down

There is little to no current, there can be no voltage drop especially with two pairs of 2/0 cables.... someone at EG4 cannot calibrate a voltmeter....

T

 

[fnnwizard]

So I made the switch to Lead-Acid mode, because "Closed-Loop Voltage" did no better than "Closed-Loop Voltage SOC"...

The voltage displayed instantly jumped from 55.3at 17:05 to 58 at 17:09
WTF?

For giggles, I switched it back to "Closed-Loop Voltage" and the voltage dropped back down

There is little to no current, there can be no voltage drop especially with two pairs of 2/0 cables.... someone at EG4 cannot calibrate a voltmeter....
View attachment 320436
T

Yikes! yeah, it's always best to get the individual cell V from the bms first and add those up to get pack V, then compare to inverter's V, BMS bus V, and the reported ones in the data history.

 

[mjcother]

Yikes! yeah, it's always best to get the individual cell V from the bms first and add those up to get pack V, then compare to inverter's V, BMS bus V, and the reported ones in the data history.

sounds like work the developers should have done, not the end user, would you agree?

 

[fnnwizard]

sounds like work the developers should have done, not the end user, would you agree?

100% concur. Have to figured out / be sure which is the correct V now. Can youget the BMS cell and pack V from the battery LCD (bms)?

 

[kampto]

The charge and discharge curves are very steep at the high and low ends. Takes only minutes to go from 55v to 58v. I believe this is normal. I wish there was a configurable absorb state on the EG4 config page to add some balancing but there isnt. Im currently running my wall mount using the 6000xp in voltage mode to hit 58v then float at 54v. Curve looks like this. Trying to get some balancing before switching back to SOC mode.