Looks like the cheap chinese charger off your GPR-S. I bet if you asked Electric Motorsport, not even they would be able to tell you how to tweak it.
Does anyone recognize the make/model of this charger? A sticker on top says 72v 6A. The open-circuit output is 89v, and I recall it going up to 86v max when connected to a pack. There are 3 pots on the board labeled VR1-3 and a blank spot for VR4. Maybe one is the max output voltage, one is the knee, and the other... ? Just wanted to check with the experts before I go screwing up the settings
Depending on how I configure the replacement pack, I may need the output to max out at 78v.
BTW - do any here by chance recognize this stretch of curvy-straighty funness?
Yep that's the one. As cheap as it looks from the outside, the circuit board & components look professional and decent quality. Guess I'll try fiddling with the pots and hope neither I nor the charger get fried
I recall Ed had a 72V DeltaQ for sale a while back. I can also source a brand new DeltaQ pretty easily. The charging profile of the DeltaQ is fairly simple to program with the programming dongle. Might be a good option if all else fails.
I have had no luck today trying to upload a photo of my charger sticker into the attachment window. So here is what my charger sticker says:
The charger sticker says: Model: EMC-7206LFP.
AC input: 110/230 VAC - manual switch, 60/50Hz
DC output: 90V = Constant/ 6 amps
DC output wire: Brown wire DC(+)
Blue wire DC(-)
Hey I think you found it! Shame that there doesn't seem to be any documentation on how to adjust it. Against my better judgment, I experimented with the pots, first marking their original locations. VR2 alone affected the open-circuit voltage. 5 full counter-clockwise turns brought it down from 89v to 78v
My hunch is that the other two control the knee and CC level.
Harlan - thanks for the suggestion & offer. I'm evaluating my options and may contact you about it.