Noisy PFC-30 Charger

The Manzanita Micro PFC series chargers are renown for being noisy. The graph above shows just how noisy. Charging at about 10A starts at 50 seconds and continues for about 180 seconds. Charging resumes briefly at 40A. We can see about 50mV of noise while charging at 10A, and 200mV at 40A. Currently the EVD5 firmware does not average voltage readings, I had similar noise problems using a LabJack with the PFC-30 charger and averaging was very helpful.

The good news is that the BMS didn't crash. The LabJack crashed if I charged at more than 7A, while the EVD5 BMS, even with floating current sensors (I've only hooked up the voltage sense wires, the bypass circuit will come later) was happy at 40A, at least for a short time. I'll test high current more thoroughly when I've packaged enough BMS boards for the whole battery.

See evd5-pfc30.tar.bz2 for the raw data.