I was going to reply to this thread
where this subject is discussed, but decided not to necro it and derail it from the OP's build.
I would like to double my bike's charging speed. I have a 22s Leaf cell pack and charge it to about 91v using two Meanwell RSP-1000-48s trimmed for the desired ending voltage. This gives me 21A charging, which is great, but I want more.
I ordered a HP ESP-120 server power supply which provides 51.2v and is commonly modified to provide power for 48v input chargers by the model flight crowd. My hope is that I can put the RSPs in parallel with their current sharing mode enabled, and put that unit in series with the server PSU- so I'd get 51v from the HP, and then the pair of Meanwells would provide the remainder of the voltage and current control.
I was warned that this could be a problem, as I've been told that the RSP-1000 units will only let the voltage sag 9v or so from their setting in constant current mode. Can anyone confirm that? If so, I couldn't use this to charge from 0% on my pack without re-trimming the voltage. Do I have that right?
This will also get interesting because I 'hacked' one of the RSPs to provide a half-power mode by removing one of the two sense resistors on the underside of the PCB and replaced it with a switch on some short wire that provided similar resistance. I'll have to remove that and hope that it works as originally built.
For reference, here is my original build thread