01-14-2021, 05:18 PM | #11 |
Gone Wild
Join Date: Nov 2020
Posts: 215
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Re: building 2 more 72V carts
https://www.buggiesgonewild.com/show...49#post1784749
heres a start at some we have talked about. The Red comparator with addition of a relay is used for charging shutdown and low voltage shutdown. https://www.ebay.com/itm/12V-24V-Red...-/323746518582 |
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01-14-2021, 05:26 PM | #12 |
Not Yet Wild
Join Date: May 2020
Posts: 47
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Re: building 2 more 72V carts
i agree that i dont need 650A my concern is if i hit the gas hard i might get a .5 sec surge of 650A and the BMS will shut down the battery. in your system what's your peak amps at full throttle?
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01-14-2021, 06:50 PM | #13 |
Gone Wild
Join Date: Dec 2020
Location: Melbourne, Australia
Posts: 1,919
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Re: building 2 more 72V carts
Hi Morvolts2,
So you have one of those Red comparators on each cell? |
01-14-2021, 09:31 PM | #14 |
Gone Wild
Join Date: Nov 2020
Posts: 215
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Re: building 2 more 72V carts
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01-14-2021, 10:06 PM | #15 |
Getting Wild
Join Date: Jan 2019
Location: Knoxville TN
Posts: 95
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Re: building 2 more 72V carts
My BMS can take 500A for 10 seconds, 350A for 30 seconds, and 200A continuously.
I have set my controller to limit the amp output to 200A with the speed limited to 40 mph, and have no trouble maintaining that on level ground and never drop below 37mph climbing our East Tennessee hills 😁 |
01-15-2021, 01:57 AM | #16 |
Gone Wild
Join Date: Dec 2020
Location: Melbourne, Australia
Posts: 1,919
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Re: building 2 more 72V carts
Hi Morvolts2,
The Red comparators you linked to are for either 12v or 24v. What is your pack voltage? |
01-15-2021, 08:39 AM | #17 | |
Gone Wild
Join Date: Nov 2020
Posts: 215
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Re: building 2 more 72V carts
Quote:
that build was 12S(48V) doing another that will be 72V. The voltage range is good up to 100v its the voltage required to run the metering. Newest build I may need to tap a voltage lower than 72v. No big deal as if IIRC its 15 mV that is consumed. |
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01-15-2021, 09:25 AM | #18 |
Gone Wild
Join Date: Sep 2012
Location: Charlotte, NC
Posts: 9,329
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Re: building 2 more 72V carts
There are better units that don't use those small "ice cube" relays and can be directly powered from the pack. They are also cheaper and available from Amazon prime:
https://www.amazon.com/gp/product/B0...G8TSLEZQ&psc=1I don't understand why You like to criticize "Chinese" stuff but link to and use it yourself for safety functions. So You have this whole kludge of individual cell alarms and a overvoltage monitor and still have no overvoltage protection at the cell level. A simple BMS is a lot cheaper, around $30, and would provide not only your "alarms" but would also stop the charger if a cell gets overvoltage during charge and disable the cart if a cell gets under voltage during driving. |
01-15-2021, 09:28 AM | #19 |
Not Yet Wild
Join Date: May 2020
Posts: 47
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Re: building 2 more 72V carts
dougrobling what BMS are you using?
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01-15-2021, 02:09 PM | #20 | |
Getting Wild
Join Date: Oct 2014
Posts: 102
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Re: building 2 more 72V carts
Quote:
So did you buy the 60Ah batteries or the 100Ah ones? Have you installed them in your battery trays yet? I’m looking at the 100Ah cells for my 48V DS and it appears I would have to split them between 2 trays. Sent from my iPhone using Tapatalk Pro |
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