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Question Flexboss and 2 EG4 Batteries

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(@fsbma1)
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Joined: 4 weeks ago

I have a Flexboss21 and (2) EG4 batteries. I recently set the batteries to keep the batteries at 85% SOC normally as I only use the batteries for power back up. The batteries now are discharging about 1 amp, but each separately at different times. I just set the SOC to 90% and the inverter started charging the batteries, however I noticed that the batteries both have a different s SOC---the master battery is 89% now but the slave battery is at 83%. Doesn't seem like my system is working correctly. Any thoughts? 


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Topic starter
(@fsbma1)
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Joined: 4 weeks ago

Now my batteries are 93% (Bat1) and 84% (Bat2) respectively and Bat2 is showing discharge. Flexboss is not charging the batteries anymore

 


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EG4 Eric
Posts: 914
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(@eg4eric)
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Which batteries are you using with your system?


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(@fsbma1)
Joined: 4 weeks ago

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@eg4eric

We actually had a power outage last night I tested the batteries with my small heat pump system....not practical as it brought the batteries down to 46% by morning. Just a test. Anyway, the power came back up in the morning and the batteries are now sitting at Bat1 94% and Bat2 84%. Seems like the batteries should have more or less the same SOC.


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EG4 Eric
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@fsbma1 
What was the voltage?

Do you usually charge your batteries to 100% and discharge to 20%?


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Topic starter
(@fsbma1)
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Joined: 4 weeks ago

The voltage is 53.25 and 53.27 right now with one saying its at 98% and the other is at 80%. I have it set to charge to 90%. 


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EG4 Eric
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@fsbma1 
I recommend charging the batteries to 57V and letting the battery recalibrate to fix the SOC difference. I'm attaching a guide on this. You can change the inverter to Lead acid and set the voltage to 57V or if you need further assistance, please let me know and I can set it for you remotely. 

EG4-Indoor-All-Weather-280Ah-Battery-Recalibration-Guide.pdf


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(@fsbma1)
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@eg4eric I will probably work with you on this so I can see what to do and understand the changes. Of particular interest is the change to Lead-acid, is that just to be able to increase the voltage above what is allowed for the Li batteries?


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EG4 Eric
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@fsbma1 
When you apply a 57V charging voltage at ≤140A. This will ensure a safe power threshold
for the battery to reach the Cell Overvoltage Alarm at 3.7V. Once this alarm occurs, the SOC will round
to 100%.


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(@fsbma1)
Joined: 4 weeks ago

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@eg4eric Could we schedule a time today to do this? I just want to make sure I do it correctly


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EG4 Eric
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(@eg4eric)
Joined: 1 year ago

EG4 Online Support
Posts: 914

@fsbma1 
I apologize for the delayed response. I don't have a phone like directly to myself, but if you want, I can schedule a day and time to help you do this through DM's.

I work Monday-Friday 8:30AM-4:30PM


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