I posted regarding my SOK 100Ah lithium batteries running down rapidly about a year or so ago, and then not being able to find anything obvious decided to take it to an RV repair shop. They ran a check and re-wired how I had the batteries hooked up and they added a direct wire to the Victron. It worked superbly last winter during our trip to/from Arizona where all of our overnights were without shore power.
That is except the last stop on the way home at the casino in Yerka, CA. It was somewhat high in elevation and it was really cold, probably down to about 20 to 25F that night in the casino parking lot. That night at the casino the batteries just drained down to nothing and after a few hours I could not even run the furnace.
We arrived home and the trailer has been parked since, but the few times I've checked, they showed 100-percent charge on the victron display. Then I took the trailer to Silver Falls State Park here in Oregon this past Thursday for a day and the unexpected power drain started again. I was only running a MaxxFan at about 50-percent speed, the fridge (standard, non-compressor), two lights, and that was it.
I was surprised at how fast it drained the power. We arrived at 4pm and it was drained to about 20 percent by 10pm. I've attached three screen captures from the Victron app. At this point, I suspect the batteries have some type of intermittent fault, so will be looking into replacing them.
However, if anyone has an obvious idea of what might be at fault, please advise. Just to note, when I had this problem back in March I was only trying to run the furnace and fridge and a few lights (no Maxxfan).
That is except the last stop on the way home at the casino in Yerka, CA. It was somewhat high in elevation and it was really cold, probably down to about 20 to 25F that night in the casino parking lot. That night at the casino the batteries just drained down to nothing and after a few hours I could not even run the furnace.
We arrived home and the trailer has been parked since, but the few times I've checked, they showed 100-percent charge on the victron display. Then I took the trailer to Silver Falls State Park here in Oregon this past Thursday for a day and the unexpected power drain started again. I was only running a MaxxFan at about 50-percent speed, the fridge (standard, non-compressor), two lights, and that was it.
I was surprised at how fast it drained the power. We arrived at 4pm and it was drained to about 20 percent by 10pm. I've attached three screen captures from the Victron app. At this point, I suspect the batteries have some type of intermittent fault, so will be looking into replacing them.
However, if anyone has an obvious idea of what might be at fault, please advise. Just to note, when I had this problem back in March I was only trying to run the furnace and fridge and a few lights (no Maxxfan).