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Eg4 6500ex recently encountered an issue on getting .07 amp from 400w 37.07 voc panel

gt9450

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Oct 25, 2021
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I have resolved my issue. Thank you, everyone, for your input on this matter.

I have an EG4 6500EX inverter paired with six EG4 server rack batteries (four LiFePower models and two LL-S models), all housed in an EG4 enclosed battery rack. My solar setup consists of 20 bifacial panels rated at 400 watts each, with a Voc of 37.07V.

Initially, everything worked perfectly, and I was generating around 5 to 6 kW per hour. However, I’ve recently encountered an issue: each solar array now only produces about 314 watts (314V at 0.07 amps). If I run a load, the input increases slightly to about 660 to 700 watts.

This problem started after using the EG4 Chargeverter, which is connected to the bus bars of the EG4 enclosed battery rack. The Chargeverter ran for approximately 4 hours using a Westinghouse WGen 5300DFcU generator. At the time, my batteries were at about 20% charge, and I used the Chargeverter to recharge them to 90%, just as a test to see how long it would take to charge the batteries in the absence of solar power.

The Chargeverter charged the batteries to 90%, and everything seemed to run fine, including powering my home from the batteries. However, the next day, I noticed a significant drop in my solar input.
 

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The chargeveter charge the battery to 90% then I power my house from the 6500ex for full day batery got down to 30% but could not charge batttery to only about 50% because I could on bring in about 300 to 600 watts of solar .Battery are at 50% now but I think the eg4 6500 thinks they are full
 
The chargeveter charge the battery to 90% then I power my house from the 6500ex for full day batery got down to 30% but could not charge batttery to only about 50% because I could on bring in about 300 to 600 watts of solar .Battery are at 50% now but I think the eg4 6500 thinks they are full
If you've never fully charged them, the batteries SOC is very probably wildly inaccurate, especially with mix-n-match batteries, and if the inverter is taking their word for it, then this kind of thing is not uncommon.

You should probably switch to voltage (aka open-loop, aka Lead-acid) mode till you get your batteries to fully charged voltage for long enough to balance out.

314 watts (314V at 0.07 amps)
OK, 0.7 amps (from the pictures) is a little better than 0.07 amps, one gives you 220W while the other give you 22W. But still you'll only draw from your panels as needed to cover your load if (the inverter thinks) the batteries are fully charged.
 
I have had this setup for about 9 months only charging with solar. Then only thing this is new is the chargeveter being use the charge the battery.
 
I have had this setup for about 9 months only charging with solar. Then only thing this is new is the chargeveter being use the charge the battery.
OK, let’s start all the way back at the beginning. How are your batteries connected to the inverter, and are they open loop or closed loop?

What firmware revisions are each of your batteries and your inverter at?
 
Thanks, everyone, for all the help! I believe the EG4 6500EX is faulty, as I’m no longer getting any AC output. Time to move on to either the 6000XP or the 12000XP.
 
I have resolved my issue. Thank you, everyone, for your input on this matter.
 
Umm, that’s not how watts works.

Maybe your batteries are fully charged?

Have your batteries spent enough time at 100% to get properly balanced?
I have resolved my issue. Thank you, everyone, for your input on this matter.
 
I have resolved my issue. Thank you, everyone, for your input on this matter.
 
Please tell us (and the next person to come along with the same problem) what you found so we can all be that much smarter and more helpful.
A few weeks ago, I added two more EG4 LifePower4 batteries, bringing the total to five. I also upgraded to 4/0 cables but forgot to retighten them. When I removed the cover to check my PV connection, I noticed that the nuts were only hand-tightened.
 
That would certainly cause problems. In general it's good to periodically check torque on the connection bolts, especially the battery connections with the amount of current they carry.
 

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