Thread: Question Equalizing VRLA using multi4
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Old Jan 12, 2013, 11:49 AM
cmavr8 is offline
Find More Posts by cmavr8
The Netherlands, NB, Eindhoven
Joined Sep 2010
2,435 Posts
Ok, I finally found the chance to get my UPS off the grid and try to charge its batteries with the Multi4 charger, using the new settings you created for me!

I experienced something strange though:
Auto cell detection showed 5 cells. Normal charging preset showed 6 cells, which is the correct. Maybe the charger uses the Charge Voltage to estimate/detect cells?

Anyway, changed cell detection form auto to 6 "cells only" but it wouldn't start.
Changed "Stop Cells Change" to No and charge started.

After about 10 minutes I got Safety CODE 120. In the PC software I saw: "SAFETY CODE: Lithium Cell Cnt not Verified".
See first two attached graphs.

Changed "Stop Cells Change" back to Yes and the charge started OK this time!

After a while the 6 cell count became "VERIFIED". See 2nd pair of attached graphs.

Left it charging for 3h. Seems to have worked fine

The 2nd battery is in a very bad condition. Charge started but soon enough I got cell overvoltage error. It gives very strange readings with other chargers, so it is damaged, the charger couldn't help her

Anyway, thanks for the support, the job was done!
cmavr8 is offline Find More Posts by cmavr8
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