overvolting

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...

This is meant to share, not encourage (nor discourage). Don't try this at home! (unless you can afford to lose a controller, YRMV, DSAYOR, etc.) First the results, then some back story: My 120V DC controller (Curtis 1221C-7401) is no longer happy running at 140V. It started cutting out and...