11-19-2022, 12:04 PM | #1 |
Not Yet Wild
Join Date: Mar 2022
Location: South East Florida
Posts: 16
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The dynamic braking resistor
The owner's manual for my Tempo with Lithium battery states to clean the dynamic braking resistor. What is this resistor, what does it do and where is it? Thanks for you responses.
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11-19-2022, 03:16 PM | #2 |
Not Yet Wild
Join Date: Jun 2022
Posts: 39
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Re: The dynamic braking resistor
The Dynamic Brake Resistor provides improved safety and control in downhill conditions by maintaining safe speeds and protecting the health of the battery system.
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11-19-2022, 03:34 PM | #3 |
Bonafide Nincompoop
Join Date: Dec 2015
Location: Charlottesburg Va
Posts: 8,987
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Re: The dynamic braking resistor
If this is on a Lithium cart, what it means to say it it keeps the battery from exploding. By bleeding off excess current from the regen system. It prevents the regen from overcharging the battery which will cause the cells to go into thermal runaway.
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11-19-2022, 09:12 PM | #4 | |
Gone Wild
Join Date: Apr 2017
Location: SE TN
Posts: 2,218
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Re: The dynamic braking resistor
Quote:
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11-19-2022, 09:56 PM | #5 |
Bonafide Nincompoop
Join Date: Dec 2015
Location: Charlottesburg Va
Posts: 8,987
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Re: The dynamic braking resistor
Not really. Batteries don’t slowly burn, and if lithium goes into thermal runaway you generally don’t know it until the case swells up from the pressure inside and the weak part of the case splits open.
Lithium fires are pretty well documented, and are increasingly more common as more and more consumer items use lithium batteries. And we even have a member who had one that he got on video. https://www.buggiesgonewild.com/show...=184345&page=2 |
11-19-2022, 10:33 PM | #6 | |
Nincompoop village idiot
Join Date: Apr 2018
Location: Michigan
Posts: 9,628
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Re: The dynamic braking resistor
Quote:
That said, the BMS should react and shut down the pack long before any type of thermal event should occur. In the case of this resistor I’d imagine it is to prevent the BMS from shutting down the pack, which would create warranty claims and general customer dissatisfaction. And the general maintenance to clean the resistor should be simply cleaning out the fins in the heat sink. Clogged fins would prevent the resistor from cooling effectively, causing the resistor to overheat and fail. Shouldn’t take more than a minute or two to use a nylon brush and clear out and dirt or debris in there. |
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11-20-2022, 08:29 AM | #7 | |
Not Yet Wild
Join Date: Mar 2022
Location: South East Florida
Posts: 16
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Re: The dynamic braking resistor
Quote:
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11-21-2022, 08:54 AM | #8 |
Gone Wild
Join Date: Jul 2018
Posts: 212
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Re: The dynamic braking resistor
Just to add to the answers, Dealer in WNC mtns where I got mine gave me an example. First he said it protects battery and systems from over charging as others said, by bleeding off excess charging from regen when battery already at capacity. Then when it can't handle the excess, the cart gets shut down. Told me clients who lived on top of steep mtns starting out at 100% charge, had a problem with carts shutting off before they got to bottom of mtn, so system works, but in extreme situations like this they turned chargers down to 90% max charging so cart won't shut off as it gets more juice then it can handle going down hill.
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11-21-2022, 10:44 AM | #9 |
Nincompoop village idiot
Join Date: Apr 2018
Location: Michigan
Posts: 9,628
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Re: The dynamic braking resistor
That would be the BMS working as designed, and shutting the pack down to prevent overcharging. That’s certainly a great, and interesting example, however. I hadn’t thought about someone living at the top of a mountain. Thank you
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11-21-2022, 06:22 PM | #10 | |
Bonafide Nincompoop
Join Date: Dec 2015
Location: Charlottesburg Va
Posts: 8,987
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Re: The dynamic braking resistor
Quote:
And being enclosed in a plastic case, you don't know anything is wrong until the case pops open, and all that nasty gas and smoke finds an oxygen source. Probably just a difference of semantics, but when a lead battery pops open it's almost always described as " it exploded" even though in reality it was just a short combustion event. Not much different IMO when a lithium battery does the same. The BMS should prevent that, but most of those can only handle so much even if they go into shut-down mode to protect the pack. Which as you said, is going to be a hassle for the customer and garner some complaints for the PR dept to smooth over. Easier to try to bleed that power off as heat from the resistor. I still say the resistor is there to keep the pack from exploding though. |
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