Yeti PRO 4000 not charging reliably? Suggestions?

KeylorE

Has anyone experienced this? I've experienced a problem of being unable to recharge two different (original and replacement) Yeti PRO 4000 units and I'm running firmware 1.7.7.

The first unit (purchased in Dec 2024) was connected to a 3600W passthrough cable to recharge and a Haven 10 to power a load (i.e., freezer [1.7kW/day], refrigerator [1.6kW/day], boiler motor [unknown], and modem / router [trivial].) This configuration ran for 14 days and then the Yeti stopped passing grid power through. The display showed 100% charge, but the battery voltage was down to 11.3V. The powered 3600W passthrough cable was connected to the Power+ connector but the Yeti wasn't charging. Then, I tried the 110VAC cord in the AC Input and it caused the GFCI outlet [15A] to pop (Note: Input Limit Switch set to High). Then, I connected a 600W charger to the High Voltage DC Input (no charging also).

I spoke with Goal Zero tech support and told them of the "chgnmoserr" on the display. They sent me a replacement.

The second Yeti PRO 400 has been in place since 3/15. As before, I've connected the Yeti to the Haven 10 via the 30A RV AC Output and this time only powered the refrigerator [1.6kW/day]. When the display showed around 20%, I switched the Haven 10 breaker for the fridge back to grid and connected the 600W charger to the HV DC Input. It charged properly for two discharge / recharge cycles.

Today, I was unable to get to Yeti in time before it ran down to 0% on the display. The battery voltage was down to 45V. I switched the Haven 10 fridge breaker back to grid and plugged in the 600W charger. I heard a relay energizing on and off and saw the Input power go between ~10W-300W and 0W for possibly 6-8 times before the Yeti stopped clicking. I tried the 110VAC cord in the AC Input and again it caused the GFCI outlet to pop (Note: This time Input Limit Switch set to Low).

I called Goal Zero tech support and we tried a Reset 2 (Soft / PV reset) but no change. We tried a Reset 3 (Factory reset) and that didn't work either. I was advised to turn off the unit, wait 10 minutes, and try plugging the 600W charger back in. No luck there either.

I finally pulled every plug out (even if they weren't powered), did a Reset 3, and plugged the 600W charger in. After 3-4 relay clicks, the Yeti started charging again. The voltage is back up to 53.5V.

While I'm relieved, I'm concerned about the firmware's reliability to recognize the need to recharge the batteries and the presence of input voltage to use.

Any thoughts or suggestions would be greatly appreciated.

CaptMonkeyPants

I don't have any solutions, but I have the same setup as you, connected to a Haven. My third unit (I've had to return two already).just arrived today, so we'll see how long this one lasts. There are serious issues with these units.

KeylorE

Here's something I thought might be worth sharing.

While performing a set of slow power draw downs and recharges, I noticed the unit had 20% power remaining, and then dropped within 30 minutes to 2% (Balanced power setting), 43.7v, 160wH, whereupon the Yeti shut off the inverter.

I tried charging it with the 600W charger, but no luck as the Yeti's power relay clicked five times and gave up.

I did a Level 1 reset (i.e., remove all connections, power off, wait 30 seconds), then plugged the 600W charger. Again, five power relay clicks as the unit tried to accept the input charge, and then the Yeti stopped trying.

Then, I did a Level 2 reset (i.e., remove all connections, press "PAIR" button to reload firmware), then plugged in the Power+ cable to the 40A / 120V outlet. The Yeti started charging! (I suppose I shouldn't have been pleased (as the unit is supposed to charge reliably when input power is applied) but I was.)

Let's see what firmware 1.8.0 does when I load it today.