dogman wrote:Even with the gearmotors, 1000w is only going to move but so fast up a 15% grade. So you may be wanting to push the wattage a bit higher even if you go with a bigger gearmotor.
Well, 52v at 30A will yield a maximum power of 1,560 watts, which is just a hair over the claimed power in the video that chroot posted earlier depicting a 10T scaling a much steeper incline than I have to deal with. And again, I don't need to be able to make tremendous speed up the hills, I just need to be able to make it over them without blowing anything up, which is the one thing that my present system is not capable of doing reliably.
dogman wrote:If you choose the 10T, you will have to volt up to reach 25 mph I think.
Volt up relative to what? Higher than 52v?
Like I said at the outset: speed is not the #1 concern in this build. If I wanted to be going fast, I'd be riding my SV650 or driving the turbo Miata. Speed is nice, but just being able to get over the hills at all is the real goal.
wesnewell wrote:A little late to the party, but have you considered just doing a shunt mod on your current controller, and/or going to 48V?
Seems ashamed to waste a perfectly good setup when it can be made to do what you want for nothing .
I did briefly experiment with 48v by installing an SLA pack in series with the primary battery, and while there was a notable difference in top speed, hill-climbing ability was not dramatically improved.
As to current, that is the real problem that started this whole thing. With the AmpedBikes lithium bottle battery I have now, I have blown the BMS in it twice just by operating it at the standard 36v and 22 amps. The most recent feedback which I've gotten from Danny at Amped is that their battery just isn't suitable for operating in that range (mind you, the battery, motor and controller were sold to me as a complete package), and that after having the battery repaired, they want me to downgrade the controller to 15A.
So that's why I've basically conceded that the system I have now is not even worth upgrading, and that I'm better served by just tossing it out and starting fresh. I consider it to have been an expensive learning experience.
dogman wrote:5 mph more speed at the bottom of a short 15% hill might do the trick.
I'll be sure to convey that to whoever programs the traffic lights here in Carlsbad.
dogman wrote:I'm still not clear myself, wheter the existing kit works or not, or just won't work on 15%.
At present, it does not work at all, as I blew the BMS for the second time this past Tuesday afternoon. This is what it looks like at the moment:
Prior to this, it worked well except on the 10-15% hills, where it was only just barely adequate. And since their proposed solution involves downgrading the current through the system to a level that will make it not work at all for the hills which I really need it for, I'm not really considering any sort of upgrades that involve retaining the hardware which I have in any way. Sorry if I wasn't as clear up front as I could have been on that. I didn't want this to be a thread where I bash on a particular vendor.