Hi Ron,
I was wondering whether the your regen problem was due to the 12S LiPo pack you were using so I carried out some tests today on my MP4.
I have a 1S pack, a 2S pack and a 3S pack in addition to my normal 4S hard case packs so I've been doing some testing today using a LiPo pack made up of between 8 to 13 5Ah cells:
Using 12 cells
(to simulate your pack) and the default 48V setting the regen worked every time.
I also tested 8S, 9S, 10S, 11S and 13s and regen works with all of them if the voltage in the controller is set to ensure they are within the usable voltage range, so I still don't understand why your regen doesn't work.
The shunt for the Cycle Analyst should make no difference whatsoever to the regen.
I have also discovered that I can run my 8S pack on a modified 36V setting
(instead of the modified 24V setting I had before) and with the "Undervoltage protection value" set at 27V it can still discharge the cells down to 3.375V each which is ideal for my use.
Unfortunately, the lowest voltage I could enter on the "Overvoltage protection value" was 48V but as I don't do much high speed braking normally on this bike it shouldn't really be a problem.
On the 36V setting the battery gauge also works much better on the Smart LCD Display:
On the 24V setting it always remained full even if the battery was half empty.
I also did some testing using a pair of wattmeters to measure the regen current and here are the result:
Maximum wattage was 892.8W under power and 567.4W generated during regen @ 21.87mph with ~31V battery voltage.
Maximum current was 29.98A under power and 17.92A produced during regen.
I tried the same test later when the battery voltage had dropped and the regen result was much higher:
Maximum wattage was 798.2W under power and 805.2W generated during regen @ 20.00mph with ~30V battery voltage.
Maximum current was 27.46A under power and 26.12A produced during regen
(shown on the lower wattmeter):
Even at my relatively slow speeds of 20~22 mph the regen definitely produces a lot of power!
Alan