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Unread 02-09-2016, 08:28 PM   #11
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Default Re: 48 volt twin motor twin 500 amp controllers on lithium power

Iím just re-using the original factory supplied controllers that are capable of 500amps. Unfortunately it seems you canít program these like the alltrax. If I could I would simply limit the amps the controllers pulled.

So one 60 ah 53v nominal pack can handle 240 amp continuous?
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Unread 02-09-2016, 08:35 PM   #12
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Default Re: 48 volt twin motor twin 500 amp controllers on lithium power

Yes, a single module is rated to 240A continuous.

A module contains 4 cells in a 2S2P configuration (8.4v at 60AH).
Each cell is rated at 4.2V 30AH.
See attachment to see how cells are configured inside each module
Attached Images
File Type: jpg BatteryInside.jpg (55.8 KB, 0 views)
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Unread 02-09-2016, 08:46 PM   #13
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Default Re: 48 volt twin motor twin 500 amp controllers on lithium power

Thanks rottie. You wouldn't happen to know of a good amp meter that I could pick up to do some analysis on my buddies buggy to get a feel for the amps it draws under load? That would be the easiest way to get the answer I need.....as long as the meter I need doesn't cost $1,000.
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Unread 02-09-2016, 10:13 PM   #14
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Default Re: 48 volt twin motor twin 500 amp controllers on lithium power

I would say look on eBay for any meter with external shunt.
I would start at a 500-600amp versions
There are a million options, it all depends on what you requirements are.

A simple setup is get a 500A at 50mV shunt with 50mV analog meter.
This will give you quick answers for probably less than $100.
If you want higher resolution, then look at the digital versions, but be aware that they usually required a isolated DC source to power the meter. Also the digital type usually goes in the negative lead.
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Unread 02-10-2016, 08:11 AM   #15
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Default Re: 48 volt twin motor twin 500 amp controllers on lithium power

I would go with 120AH - 14 Leaf modules. Wire them in 7S2P to get nominally about 50V and 120AH. Weight is 120 pounds. Volume is about two of your old batteries.
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Unread 02-10-2016, 08:57 AM   #16
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Default Re: 48 volt twin motor twin 500 amp controllers on lithium power

I agree with Volt_Ampere as a good start.
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Unread 02-10-2016, 09:40 AM   #17
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Default Re: 48 volt twin motor twin 500 amp controllers on lithium power

I cant see pictures but, I'm going to follow along! This is going to be interesting.
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Unread 02-10-2016, 01:34 PM   #18
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Default Re: 48 volt twin motor twin 500 amp controllers on lithium power

I found out the meter I have coming will read amp draw real time with a 75mv 1000amp shunt. That will allow me to do some testing on my buds cart to see what two motors pull. I will probably end up with the 120 ah pack.

Are the pics not working for everyone?

I'll post a link to a great write up on the JDL404 that I found later when I get home.
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Unread 02-10-2016, 07:58 PM   #19
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Default Re: 48 volt twin motor twin 500 amp controllers on lithium power

EVTV has a great writeup on the JDL404 Meter. Really good for those who are looking to install their own. Here is the path to the pdf.

http://media3.evtv.me/JLD404AH.pdf
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Unread 02-10-2016, 10:11 PM   #20
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Default Re: 48 volt twin motor twin 500 amp controllers on lithium power

Where does an amp meter hook into the electrical circuit?
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