Yeti Pro 4000 Nominal Voltage
So, I had an incident recently where, after sitting unused for a few days my Yeti 4000 started beeping with the CHGMONERR warning. There was also an alert telling me there was a battery fault. The only way I could get the unit to power on was to plug the AC charging cable into the back of the unit. Even with it plugged in and powered on, the inverter wouldn't power the AC outputs.
Device Info menu showed me that the voltage was at 41.1 V, even though the front panel was showing 100% charge. I read some other posts here where it seemed like others were reviving the Yeti with a direct DC charge. So, I pulled out my Nomad 400 panel and plugged it in. Almost immediately the voltage started to rise. Then when the voltage got somewhere into the 50s, I was able to power up the AC outputs.
I plugged in a nearby shop vac and started it up. It ran for a few seconds, then shut off and the Yeti showed 0% charge instead of the 100% it showed just seconds ago. So, it seems to me that after sitting idle for a few days, the voltage drops and the unit doesn't display the corresponding drop in %-charge.
I guess my question is, what is the nominal voltage for the unit? Mine is currently holding steady at 53.3 V. Also does the current firmware version 1.5.8 do a better job at either reflecting the voltage drop on the front panel through the state-of-charge %, or does it better maintain the voltage while plugged into AC input power? I would think that this would be essential for emergency preparedness where the unit can sit idle for weeks until needed and the voltage could potentially drop over time.
Comments
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I had a similar issue. Charged 100% on A/C, let it sit for weeks, and then the unit wouldn’t turn on without being on A/C. Had the CHGMOSERR and BATTERY FAULT errors, internal battery temp issues (showed -459 on the app). The firmware wouldn’t even update. Goal Zero shipped me a 600w power supply (no charge). After sitting on that power supply for 24 hours, everything was working fine. I was able to update the firmware and use all outputs without issues.
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@Learning Thanks for sharing your experience. This is very consistent with what I've seen over the past couple of weeks. Mine sat idle for the past few weeks and was holding steady at 90% charge. But yesterday I tried to use it with my shop vac in the garage and as soon as I turned on the AC ports and started the vacuum, the state of charge dropped to 78%. So, it feels to me as if the system doesn't do a good job of monitoring its true state of charge.
I have the same 600V power supply that they sent me and maybe over the course of the next couple weeks, I'll leave it plugged in to the Yeti and see if it does a better job at maintaining readiness. Ideally in the spring, I will add some more solar power to the house and use that to maintain the charge on the unit.
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LFP haves a higher self drain as NMC. I think the system does not recognize the self drain und shows you a higher SOC as it is.
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I have a 4000 PRO for home backup. It just sits there most of the time. Last spring we had to replace the original device due to its inability to maintain the battery voltage. I got an alert in the app and then needed customer support to advise. They said it should be in the range of around 50V, e.g., 51.0-53.3 V seemed good, but mine kept on dropping into the 40s and below until it irreparably dropped too far. Before throwing in the towel, they had me plug my little Yeti 200X into the DC (solar) input port overnight, but it was too little, too late. There is absolutely nothing you can do if the battery voltage starts to drop below some mysterious threshold, unless you have some workaround compatible DC input. I don’t know if they’ve fixed this problem or know what causes it.
The replacement saga was a whole different nightmare. I am on my fourth device. (3rd was damaged by FedEx, so doesn’t count wrt usage, but was still a total pain to return.) I upgraded the latest device to FW 1.7.7, to get the fixes to errors introduced with 1.5.8, but mostly to get the Port Restore feature for APS. This turns the AC output port back on after a power outage and the Yeti battery is empty (or drained to its min charge profile), and then power comes back on. The Port Restore is needed to turn the AC output port back on, in order to send power to my Haven 10 transfer switch. Otherwise, the Yeti just happily recharges itself without powering anything in the house! I tested it once in January and it worked. Keeping my fingers crossed that it will work when I need it, especially when I’m not home and it’s been sitting idle for several weeks!
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Here is my similar experience: My Pro 4000 was powered through the pass-through cable and was powering a freezer. I received a warning that my voltage was low, by the time I reached the Yeti four hours later the voltage was down to 41.7. Weirdly, the SOC on the Yeti still read 85% but the low voltage clearly meant it had been drained.
After perusing the forums here I tried charging it from the 600-watt charger that came with my 6000X. It would start and stop about five times, then not charge again. However, I noticed that my voltage was raised one tenth of a percent, so I tried it again and once more the voltage came up .1%. I repeated this step about 25 times, which was tedious, but once the voltage came up to around 44% the unit started taking a regular charge from the charger and I was able to leave it alone.
Here's the wild part: after half an hour I plugged an appliance into the front just to see if it work. Suddenly the SOC updated from 85% to 7%!
Hopefully this helps someone else who is having the same problem.
