undervoltage

Hi everyone I am purchasing ZENN 1 EV LSV Has a Curtis 1236e-64xx Zenn is a 72 VDC if I hook up a generator as range extender by hooking up a homemade ac/dc battery charger the bulk voltage would be 1.2 X Nominal Battery Voltage so in this case 86.4 VDC is that going to cause problems or is...

Hi everyone. Here is the situation; Have 1238 controller to AC-12 motor. 72 volt system. Was driving it and it cut out. Let sit for a minute, flipped switch a few times, after multiple attempts it ran again. Noticed motor was overheated slightly. Next day adjusted encoder steps from 128 to 64...