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Question Off grid 6000XP, lead acid, generator help

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Posts: 8
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(@dan_in_ak)
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Joined: 3 months ago

Well, for anyone watching this thread, you have as much info as I do from EG4 (above), but I've talked to CurrentConnected a couple times on the phone.  They've told me there's no SOC for lead acid (it's in the logs though) and that there's no Equalization for lead acid, that's only a LiFePO4 thing (I was trying to cheat and use EQ for an absorption charge for 2-4 hours but it never does that either). I questioned that equalization is no needed with flooded lead acid, and he asked some other techs, and apologized, but regardless I couldn't get it to EQ anyway. The voltage available from the 6000XP isn't sufficient for EQ of a nominal 48v lead acid battery bank anyway, it should be near 62v.  The 6000XP has worked enough to keep me with power by setting the Gen controls to SOC based, and it had been shutting off ok, but still not charging with an acceptable profile for lead acid.  It just charges until it hits the charge voltage, then shuts off, with it at high 90's % SOC indicated in logs (also a pain because I can't see this anywhere except in exported logs).

Well, today it started, I went out to cut firewood, and came back thinking "at least the genny will be off, it's been a couple hours."  Nope, still running, and it cycles, too fast to even see in the logs, but it cycles 5400 watts charging, then stops charging, but does not shut off the genny, then starts charging again after less than a minute later after a 200w load, and repeats.  Logs now indicate only 90% SOC, again internally calculated somehow because lead acid doesn't have a BMS.  I changed to Generator by Voltage, set the stop voltage just under where it drops to when it quits charging so the genny would shut off.  If I set it under the charge voltage, but above where the voltage drops to right after it stops charging, it just keeps cycling.

This isn't consistently working at all, it's eating up fuel, it's hard on the genny, it's not good for battery useful capacity or long life, and since I bought the 6000XP 7 months ago, obviously the distributor (CC) won't take it back, and they also no longer ship to Alaska.  I feel a $10,000 (plus a couple thousand $$ third party shipping to Alaska) Lithium battery bank would be the best, and only option, if I want to stick with the EG4.  For a fraction of that price, I've got another inverter coming from Signature Solar via UPS (SS will still ship to AK), but to get the capacity I wanted, I ended up with a single phase 230v Euro inverter with an auto transformer to split the phase to 120v x 2 legs.  My generator can supply 230v single phase by swapping one wire, so this is an acceptable solution for me.  Without the transformer, the cost was similar to the EG4.  I also will need another solar charge controller now.

Anyone want a used 6000XP after I get the new one going?  I was skeptical when I bought it but the value if it worked for my use would have been great.

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Jared
Posts: 247
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(@jared)
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Joined: 3 months ago

We are still investigating the bug not allowing the 6000XP to equalize while in lead-acid. However, this solution from another thread may work as a quick fix until we are able to resolve the issue.

https://forum.eg4electronics.com/community/inverters/6000xp-bug-in-charge-controller-setpoint-voltages-with-open-loop/paged/3/#post-489

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(@dan_in_ak)
Joined: 3 months ago

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Posts: 8

@jared That link was trying to get a charge curve for LFP, not FLA (flooded lead acid) batteries. I needed a charge to a voltage, hold that voltage for a few hours, then shut off the generator that had auto started.  While I also need equalizing charge at 62v, that wasnt my main concern.

I've got a Victron installed and working with just a Raspberry Pi to control and monitor it.  It charges with a great, adaptive curve that matches what Trojan and Rolls want for lead acid. It shuts the generator off after the absorption phase, and a new controller/display will even allow a generator warmup/cooldown for the auto starter. It also has a much nicer web history view.

I'm still interested in the EG4 as a backup, but need to see some update about the gen input cycling charge/discharge and more than "charge to 58v and then stop" as the batteries must be held at voltage for a while to properly charge. 

To put it in perspective, after an EG4 charge cycle, my "19kW at 50% dod" bank gave me about 4kW of use, or 20 hours. After the proper charge cycle, I get 3 days, about 15kW usable before the next auto start. This is similar to my 15 year old Outback 3524 and Honda 3000is manual start I had hooked to the same batteries before the 6000XP. I have the auto start set for the same low battery voltage setting.  Some of this is also due to the 8kW Victron using about half the power overhead (20-25W).

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