lifted club cars - lifted ezgo
Home FAQDonate Who's Online
Go Back   Buggies Gone Wild Golf Cart Forum > Golf Cart Repair and Troubleshooting > Electric golf carts > Icon


Post New Thread  Reply
 
Thread Tools Display Modes
Old 08-21-2021, 05:29 PM   #1
PLee83
Not Yet Wild
E-Z-GO
 
Join Date: Sep 2017
Location: Phoenix AZ
Posts: 27
Default Parking brake e-brake safety issue with lithium shut off

So I'm getting a new icon i60l 440a/5kw setup and was going to put a bigbattery.com HSKY 48v lifep04 in it. Big battery told me HSKY has a 130ah cont discharge capability where the 2x NMC 48v packs would be 100ah cont rated, so they recommended spending more on the HSKY.

First, anyone try this HSKY or the 2xNMC 48v bigbattery.com batteries on an i60l loaded with adults? I don't want BMS shut downs on hills when loaded. Any other opinions on the brand and battery construction?

Next...
The dealer is really nervous about it and having the e/p-brake engage and throw me out the windshield if it were to run out of juice. I guess by default is that if power is cut, electronic brake is engaged.

Does anyone know if there is a workaround on this yet?

I wouldn't mind just pushing a switch to arm the brake when I park if there is a way to wire around the "If no power - engage brake" logic of either the wiring or the controller. I saw another user on here put a Navitas in just to avoid this potential disaster of a parking brake if the batteries shut off. I guess Navitas has a workaround in the controller to never allow the battery to just shut off or something.

I sure as heck don't want to throw my passengers out the windshield.

Thanks Icon fiddlers.
PLee83 is offline   Reply With Quote
Alt Today
BGW

Golf car forum Sponsored Links

__________________
This advertising will not be shown in this way to registered members.
Register your free account today and become a member on Buggies Gone Wild Golf Cart Forum
   
Old 08-23-2021, 05:00 PM   #2
ATrain
Gone Wild
 
Join Date: Oct 2012
Location: SoCal
Posts: 671
Default Re: Parking brake e-brake safety issue with lithium shut off

I thought the controller has logic in it to prevent the eBrake from engaging while the cart is moving, provided there is some power. It also has logic where you can set the upper/lower voltage limits and it goes into "limp mode". I would think that if you tuned that setting correctly, you could mitigate a total power loss at high speed causing the eBrake to lock supposedly? The lithium packs don't just go from 100% to 0%, they still have a voltage drop I thought.
ATrain is offline   Reply With Quote
Old 08-23-2021, 05:26 PM   #3
PLee83
Not Yet Wild
E-Z-GO
 
Join Date: Sep 2017
Location: Phoenix AZ
Posts: 27
Default Re: Parking brake e-brake safety issue with lithium shut off

I always thought of a typical BMS does a complete shut off if there was a cell issue (too high/low) or a peak discharge spike that was above the batteries tolerance limits.

Actually with regen carts I've heard of issues where there is a charge spike (steep hill fully loaded) if the BMS/battery isn't capable of taking the charge as well.
PLee83 is offline   Reply With Quote
Old 08-24-2021, 01:12 PM   #4
ATrain
Gone Wild
 
Join Date: Oct 2012
Location: SoCal
Posts: 671
Default Re: Parking brake e-brake safety issue with lithium shut off

Quote:
Originally Posted by PLee83 View Post
I always thought of a typical BMS does a complete shut off if there was a cell issue (too high/low) or a peak discharge spike that was above the batteries tolerance limits.

Actually with regen carts I've heard of issues where there is a charge spike (steep hill fully loaded) if the BMS/battery isn't capable of taking the charge as well.
You may be right here. I haven't had enough experience with lithium BMS's and their shutoffs. I'm asking a friend to see if he knows. Somebody should have a solution for this though because it's a little insane that you have to cross your fingers that you don't get launched out of the cart over a loss of power.

I'd imagine even with a stock cart, if you had a loose battery cable or something and hit a bump and had a total loss of power...I just can't imagine that would go overlooked. I'd guess there are speed thresholds.

I actually recall the dealer saying the eBrake was just a little piece of metal or something and it could be broken if you were too rough with it, so I'd lean towards a failure like that happening you'd just end up with a broken eBrake.
ATrain is offline   Reply With Quote
Old 08-31-2021, 04:35 PM   #5
PLee83
Not Yet Wild
E-Z-GO
 
Join Date: Sep 2017
Location: Phoenix AZ
Posts: 27
Default Re: Parking brake e-brake safety issue with lithium shut off

Good point on the loose cable but this is my understanding, and I’ve heard of it happening. Just ordered 3x 56ah packs to try and combat the potential of a Shut down a little on a couple carts. Big battery says they are 180ah cont and 386ah Max (6 seconds). If I upgrade to 4th one which is a drop in it would be 252ah cont and 506ah peak. I’ll let you know how it goes I suppose.
PLee83 is offline   Reply With Quote
Old 08-31-2021, 05:18 PM   #6
ATrain
Gone Wild
 
Join Date: Oct 2012
Location: SoCal
Posts: 671
Default Re: Parking brake e-brake safety issue with lithium shut off

Quote:
Originally Posted by PLee83 View Post
Good point on the loose cable but this is my understanding, and I’ve heard of it happening. Just ordered 3x 56ah packs to try and combat the potential of a Shut down a little on a couple carts. Big battery says they are 180ah cont and 386ah Max (6 seconds). If I upgrade to 4th one which is a drop in it would be 252ah cont and 506ah peak. I’ll let you know how it goes I suppose.
Please do because I think you're the first with this concern/situation.

I think I'd put some attention to asking around about the parking brake that gets engaged. That might be the key to everything. If it's just a little ratchet-style, it might just break off in the event that happened.



If it's a pin that gets inserted somewhere, it might do the same or it might just not engage because the cart is moving too fast and it can't align?

Then I'd be curious the repair effort/cost. It might be a cheap part and easy fix, then you'd have peace of mind. No clue though.
ATrain is offline   Reply With Quote
Old 09-08-2021, 06:16 PM   #7
PLee83
Not Yet Wild
E-Z-GO
 
Join Date: Sep 2017
Location: Phoenix AZ
Posts: 27
Default Re: Parking brake e-brake safety issue with lithium shut off

Well, I've heard horrific stories of people getting thrown out of their seat, so I doubt it breaks off.

There is another thread on here somehwere that someone thought was a loose nut, they tightend it and then the parking break wouldn't let off

They loosened it and it went back to normal (ie lock up on power off).
PLee83 is offline   Reply With Quote
Old 09-09-2021, 10:15 AM   #8
ATrain
Gone Wild
 
Join Date: Oct 2012
Location: SoCal
Posts: 671
Default Re: Parking brake e-brake safety issue with lithium shut off

Quote:
Originally Posted by PLee83 View Post
Well, I've heard horrific stories of people getting thrown out of their seat, so I doubt it breaks off.

There is another thread on here somehwere that someone thought was a loose nut, they tightend it and then the parking break wouldn't let off

They loosened it and it went back to normal (ie lock up on power off).
That was me! Yes, on the side of the motor there are 2 or 3 smaller hex screws. I think under power, the e-brake is held open, then there's a spring in the motor that pulls the e-brake closed at loss of power. Then when you tighten those hex screws, it just holds the e-brake open.

Same thought though that it would break off at speed. I only say this because my dealer told me to be careful with the eBrake because it could break off if I was too hard with it and that it was only a little piece of metal.

Him saying this made me think another cart owner broke his off. Again, I have no other information regarding the eBrake other than those comments from my dealer.
ATrain is offline   Reply With Quote
Old 09-09-2021, 11:29 AM   #9
AdamP
Getting Wild
 
Join Date: Sep 2021
Location: Port st Lucie Florida
Posts: 80
Default Re: Parking brake e-brake safety issue with lithium shut off

Left my dealer a little while a go and question the mechanic about the E brake unfortunately they are a new dealer and haven't had time to look into this concern. He did say one thing the easiest way to avoid this is keep and eye on the battery level of charge
AdamP is offline   Reply With Quote
Old 09-11-2021, 09:41 AM   #10
PLee83
Not Yet Wild
E-Z-GO
 
Join Date: Sep 2017
Location: Phoenix AZ
Posts: 27
Default Re: Parking brake e-brake safety issue with lithium shut off

Quote:
Originally Posted by AdamP View Post
Left my dealer a little while a go and question the mechanic about the E brake unfortunately they are a new dealer and haven't had time to look into this concern. He did say one thing the easiest way to avoid this is keep and eye on the battery level of charge
Thanks Adamp
The issues with lithium is that a lot of the battery manufacturers don't have a good SOC meter. Usually one that plugs into the BMS to the cell level is what I think makes a good meter. Heck the Lead acid one on the icon is pretty bad as well.

Next issue is folks who don't pay attention. Ever heard of someone running out of gas? Now imagine that means your cars breaks lock up if it happens on a highway that would be pretty bad for the owner and the manufacturer.

Unlike Lead acid which keeps giving voltage and weaning down, a lithium pack can just "shut off" if it reaches a dangerous level, activating the parking break and causing a major issue.

I'm told the navitas controller is the work around and can be programmed.

I personally just bought a pack that is 3x the size I think I would ever use and watch the voltage drop of the packs as they sit.
PLee83 is offline   Reply With Quote
Reply
Go Back   Buggies Gone Wild Golf Cart Forum > Golf Cart Repair and Troubleshooting > Electric golf carts > Icon


Thread Tools
Display Modes


Similar Threads
Thread Forum
Parking Brake Removal. Replaced For a Different Style Of Parking Brake Electric Yamaha
Brake Pedal/Parking Brake Issue Electric EZGO
Parking brake issue Electric EZGO
Parking Brake/Gas Pedal Safety Gas EZGO
Parking Brake Issue Gas Club Car


All times are GMT -5. The time now is 09:15 AM.


Club Car Electric | EZGO Electric | Lifted Golf Carts | Gas EZGO | Used Golf Carts and Parts

Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
This Website and forum is the property of Buggiesgonewild.com. No material may be taken or duplicated in part or full without prior written consent of the owners of buggiesgonewild.com. © 2006-2017 Buggiesgonewild.com. All rights reserved.