6000xp bug in charge controller setpoint voltages with open loop - Inverters

RE: 6000xp bug in charge controller setpoint voltages with open loop

ouijifour — Sat, 07 Mar 2026 23:58:16 +0000

@mtjag is this with the new firmware ? In your lithium plot on the right did you have closed loop with bms talking to batteries ? The first one on left ( lead acid ) does look like it is holding float pretty good. Did you have loads on it through out the day ?

RE: 6000xp bug in charge controller setpoint voltages with open loop

dtbaker61 — Sat, 07 Mar 2026 15:45:36 +0000

I am ok with the updated behavior provided by ccaa=1c1212

RE: 6000xp bug in charge controller setpoint voltages with open loop

MTJAG — Sat, 07 Mar 2026 00:05:29 +0000

@dtbaker61 The screenshot on the left is with Lead Acid selected as battery type and the one on the right was with Lithium selected as battery type. Vbatt is holding a float for most of the day based on Date>DataHistory with the settings Lead Acid

RE: 6000xp bug in charge controller setpoint voltages with open loop

dtbaker61 — Mon, 02 Mar 2026 21:22:27 +0000

very interesting.... can you export all your settings: Maintenance>read>export PDF and post so I can see what's different?

you might take a look in Data> DataHistory to see if vBatt is actually hanging at float, or just taking a long time to sink to vFloat-1.0 v if you have very small loads. I don't see the cycling until/unless loads > PV pull down the vBat lower than vFloat-1.

RE: 6000xp bug in charge controller setpoint voltages with open loop

MTJAG — Mon, 02 Mar 2026 20:43:45 +0000

Since setting my batteries back to Lead Acid, the last three days show my system reaches 56.4v for 4-8minutes then drops back lower eventually getting back to Float at 54v (1st screenshot) as opposed to (2nd screenshot)

2495 2496

RE: 6000xp bug in charge controller setpoint voltages with open loop

dtbaker61 — Mon, 02 Mar 2026 16:34:45 +0000

@mtjag exactly.... by setting vBulk to 56.4, or 57, or even 58.0 give the BMS 5-10 minutes to balance at low current, and then allows a drop to vFloat. For the 6000xp, the behavior now with firmware ccaa-1c1212 is actually cycling between vBulk and (vFloat-1v) for the afternoon while PV is available. This is "acceptable", although I would prefer vFloat +/- 0.5v

RE: 6000xp bug in charge controller setpoint voltages with open loop

MTJAG — Sun, 01 Mar 2026 03:20:53 +0000

@dtbaker61 I definitely don't want 3 or 4 hours at that voltage to be sure. I've spoken with the SimpliPHI tech over the past 4 years with these batteries and they seem to think it's best to hit 56.4v for about 6 minutes then drop back to lower voltages for the remainder of the day. I still have 6 years of warranty on my bank (guaranteed 80% of capacity at 10 years) so I hope to exceed that by a lot. I see in your last post EG4 came through on a firmware update for charging on the 6000xp open loop charge control. How long did you have to lean on them to get that done? I hope they are more receptive to doing these kinds of requests. It just seems like going backwards when my old Outback inverter/CCs you were able to program to set points and time without issue.

RE: 6000xp bug in charge controller setpoint voltages with open loop

MTJAG — Sun, 01 Mar 2026 03:09:31 +0000

@ouijifour thank you for sharing. I'll start reading to try to figure it out. Strangely, today after switching my settings back to FLA lead acid, my system hit 56.4v stay there at least 4 minutes but less than 8 minutes and then started the decent back to Float at 54v.

RE: 6000xp bug in charge controller setpoint voltages with open loop

ouijifour — Sun, 01 Mar 2026 00:57:01 +0000

@dtbaker61 That cycling from float to bulk back to float is exactly why I quit using the eg4 xp6000 for charging lithium batteries. There are a lot better mppt chargers out there that don't do that kind of thing. I have no idea why the xp6000 would do that since it is unlike most any other charger which goes bulk to absorb , then back down to float and stays there until the next day. 55.2v is around 99% full. I understand that there are lots of different theories and thoughts about the best LiFePo4 charging practices. I do the approach to stay away from the top voltage to stress the cells less and because it isn't worth it to try and go way to the recommended limit to gain just 1% of capacity. Off Grid Garage on youtube has done extensive testing of charing voltages and load capacities with the results all graphed out and explained so that is where I get my numbers from .

RE: 6000xp bug in charge controller setpoint voltages with open loop

ouijifour — Sun, 01 Mar 2026 00:44:54 +0000

@dtbaker61 you may want absorb time to give the bms time to balance the cells . They only will do that at the top of the charge cycle. It really depends on what the bms is programmed for, and what voltages you charge to. For example I charge to 55.2v which is 3.45 per cell. That is the voltage the balancing starts at . So depending on how matched the cells are it can take between 15 minutes to an hour to balance. Also depends if a battery has passive 150 ma bypass balancing or if like in my case it has active balancing which does the balancing if needed much faster. So I don't agree with your statement that lithium batteries don't need absorb time.