Got Lithium, how low V can I drive my ev?

1450 Views 4 Replies 5 Participants Last post by GizmoEV, Jan 29, 2011

spdas

Discussion Starter · Jan 26, 2011 (Edited)

Aloha, I got my TS 200ah used lifepo4 in and they
all tested at about 3.29 to 3.33 after sitting for 6 months.

BUT I have a problem. I have a chance to get some used TS 400ah
really cheap and now thinking of paralleling the TS200's by two
and using the 400's and run in series.
Problem is that 400ah are monsters (30# each) and will be
much overkill range for my 1700# (without batteries) Yaris.
Soooo, how low a voltage would you go on existing 2/0 wiring?

I could go heavier wiring from the 1/2 pack in the rear
to the pack 1/2 in front and to Zilla and motor.
I think I will have a total of 78v using
24 batteries @[email protected] average V.

With my AGM Optimas @ 168v @ 130v running sag.
I was using 45 amps at 45mph. So if i use 100Amps
at 45-50mph continually with 1/2 voltage,
will that be too much continuous current for the 2/0?

Francis

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EVfun

· #2 · Jan 26, 2011

I wouldn't use the ADC 9 inch motor at such low voltage because the motor makes a lot of torque per amp, which means not a lot of rpm per volt. I would consider the minimum voltage to put that motor to good use to be 120 volts. Perhaps as low as 96 volts would be acceptable if the vehicle, complete with batteries, weighed under 2000 pounds.

With a 78 volt system I think you will find that the motor is always running warm at a low rpm. It will be well outside of its most efficient range.

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Ziggythewiz

· #3 · Jan 26, 2011

You'll need to pull a lot more than 100 amps to warm up a 2/0.

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coryrc

· #4 · Jan 28, 2011

spdas said:
BUT I have a problem. I have a chance to get some used TS 400ah
really cheap and now thinking of paralleling the TS200's by two
and using the 400's and run in series.
Problem is that 400ah are monsters (30# each) and will be
much overkill range for my 1700# (without batteries) Yaris.
Soooo, how low a voltage would you go on existing 2/0 wiring?

If they are truly underpriced, buy them and resell them, then buy a few more new 200Ah.

Or you'll need a smaller motor, as mentioned above.

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GizmoEV

· #5 · Jan 29, 2011

Ziggythewiz said:
You'll need to pull a lot more than 100 amps to warm up a 2/0.

I run 125+A through 1 AWG wire and they don't warm up so I don't think you will have any problem with 2/0.

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