SUA2200RMXL3U and External Batteries

[Anonymous user]

I have a question about how this unit monitors external battery packs. Currently, I have one SUA2200RMXL3U and 4 external packs connected. I have a feeling that one or more of the packs may have faulty batteries. How can I check this? I have the correct number of battery packs noted in the software, so it gives me an estimated run time, but is that just assuming the battery packs are in working condition, or if only one pack is working would that "trick" the SUA2200RMXL3U into thinking everyhting was good? What direction can I take to ensure that all is well? Thanks.

[MarkC_apc · Accepted solution]

This is a good link to help do basic battery replacement for your unit.  If you have extended run battery enclosures (SUA48XL type metal enclosures), the principals are the same with two packs in each enclosure.

https://www.youtube.com/watch?v=XEFpJzCPiTY

If you are familiar with using a voltmeter and understand all the safety issues related to AGM battery technology, you can measure the voltage of each individual battery cage at the blue Anderson connector SAFETY/SAFETY - 48 VOLTS CAN BE LETHAL - USE PRECAUTIONS - (RUBBER GLOVES)!!

The voltage of a fully charged battery pack should be around 51 volts +/.5 volts or so.  If any of the packs are substantially less than that, likely has a bad battery in it's pack.  You may have to apply a small load on the entire SUA unit to wipe off "surface charges" to detect a bad pack.  If the batteries in a low voltage pack are all the same age (should be), best to replace all the batteries.  Finding a bad battery in a pack gets a little more complicated - likely not recommended anyway for continued use of the unit.

Hope this helps