I have a Sakura s50 (erato 06), which is a straighforward 1500W BLDC motor with 48V, 40Ah lead-acid battery.
I also have a watts-up and want to wire it in to get some better data on the bike (with a view to swapping to LiFePO4 in due course). However the watts-up has both shunt and display in one unit so I can either mount the meter low at the rear, where I can't really see it (not safely whilst travelling), with short wires (~0.5m), or on the dash with quite long wires (3.5 - 4m). I could arrange it so that only the Ground wire is long - the positive wire could be 50cm as before.
Now, I have read that the inductance of the wires between battery and controller matters - too long and I will get inductive spikes that could nuke my drive mosfets. So, how do I decide what consitutes 'too long'? Have lots of other people put in watts-up meter wired all the way to the dash and back and no-one had any trouble?
The controller PCB was market BLC3000 but I found no info on this. It is surface mount with 12 MOSFETs and a PIC 16Fsomething doing the work. Looks nicely made (better than I was expecting to be honest).
One other thing - the controller has 2 wires coming out for the three motor phases and the GND wire, but only one for +V. These all change back to one wire at the connectors~10cm from the contoller. Is there any reason for this other than wire gauge? (and if not why not do it for +V too? - surely GND and +V have the same current).
I ask because I want to rewire everything in powerpoles rather than ring+2BA brass bolts which is fiddly to take to bits and uses a load of insulation tape every time I change anything. But for powerpoles I need single wires. (Or some kind of high-current splitter). I suppose I ought to do some sums really. I have noticed that 30A powerpoles are a bit weedy really. Peak current is 50A and the wires _barely_ fit in the crimps. I guess I should buy some of the larger 45A powerpoles (or double everything up).
I would include a pic of the inside of the controller, but my camera is very poorly and none of them came out.