On 07/21/2015 11:51 AM, EVDL Administrator via EV wrote:
I'll be following this effort with interest. I'm especially keen to see how
long they last for you. The cheap Chinese bike batteries don't seem to have
a very good reputation on the ebike forums such as Endless Sphere. However,
I think most riders there work them pretty hard, demanding high power from
them. Your use may stress them less. Please keep us updated.
I imagine you are correct on reliability. The MAJOR attraction for me
in doing things this way is maintainability. If a battery goes out, the
vehicle can keep going and the battery can easily be swapped out.
The golf cart I have running has given me no trouble in several charge
cycles. It is surprisingly sprightly considering the minimal
batteries. The pair of 20ah batteries are only supposed to supply 60
amps; with a "regular" battery, I've seen as much a 100 amps. I was
expecting to have to put in 3 or 4 20ah batteries. I do not have an ah
counter on it but expect to soon. So I can guess at my state of charge
and know the discharge rates.
I also wonder where you found a 60 amp-hour ebike battery! I haven't seen
any that big. Isn't it pretty heavy for a bike? Or is that more of a moped
or ecycle battery?
One of the ebike battery suppliers I've been talking to offers to build
bigger batteries:
http://www.aliexpress.com/store/208817
I have two 72v 30ah batteries coming from them for my Zap. If those
work ok, I'm thinking of putting 4 or 5 120v or 144v 20ah batteries from
that source in my Ranger. 20ah to keep the weight of each battery down
to a manageable amount.
The ~20 ah batteries seem to come with 12ga discharge wire. I've used
SB50s to connect to my 10ga wire. 5 pair of 10ga wires soldered into
two copper lugs to support up to 5 batteries. I think those gauges and
configurations may work for all three of my applications: 36v golf
carts, 72v Zap, 120v or 144v Ranger conversion with a 9" motor.
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