Mike T Posted November 5, 2022 Share Posted November 5, 2022 I have an older Powerjack 24v 5k ups and a brand new 12v 8k unit. The 5k unit was something that I previously used on an intermittent project basis, using batteries with lead acid chemistry. I just sold the 5k to a friend with a promise to help him get it working in a permanent installation to back up household freezers, using Lifepo4 batteries. The 8k I just bought is going (permanently) into my 5th wheel where I also intend to use lifepo4 batteries. Q1: What is the low voltage cutoff value for the powerjack inverters? I understand that there is an alarm for low voltage, but I need to know what the cutoff value is because if it's too low and the system is unattended during an extended power outage, we may find ourselves in a situation where the batteries are drained so low the internal BMS's go open, and then we have a whole new can of worms to address. Q2: I've observed charging voltage over the last 24 hours or so and I don't see the charger settling into the "float" voltage indicated in the manual. So far, voltage seems to stay put in the high 28V range with the battery type rotary switch set to #2. My understanding is that I need this to settle down to about mid 27v range to avoid long-term degradation of the lifepo4 batteries. Thanks in advance! Quote Link to comment Share on other sites More sharing options...
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