First, my IP22 is a 30A 3-circuit model purchased in 2019. I see there are discussions of recent models having a possible hardware issue (see Blue Smart Chargers IP22 pulsing voltage and current - #98 by M_Lange ) but presumably that wouldn’t affect my 2019 or possibly 2018 model.
However, I ran another test and confirmed some of the voltages are definitely out of spec.
I programmed the IP22 with a Custom profile with 14.2V bulk, 13.8 absorption, 13.8 float, with temperature compensation Off, Recondition Off.
During the charge cycle I noticed that while my house battery never got above 14.2V (as reported by my BMV712), the IP22 itself was reporting output voltages above 14.6, and for a brief period I saw 14.7V on a voltmeter on that same circuit.
I’ve had this IP22 for 5+ years and never noticed problems like this before.
I’m wondering: could the recent firmware changes that are supposed to fix in the 2025 models actually be causing a problem in older models?