08-27-2018, 08:16 AM | #161 | |
Not Yet Wild
Join Date: Jun 2018
Posts: 43
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Re: Club Car Onward Leaf Lithium conversion
Quote:
Good to hear all is working well 8 months later and will make a note about the pin issue. That error message is annoying and I’m not sure they can re-program it to one voltage because I asked them before Iordered and they said it auto-senses and that’s it. Not a big deal I guess. Have you noticed a significant draw of your Dc-Dc reducer? Imagine you don’t if you are charging daily etc. I don’t use my cart sometimes for a week or two and have a sleep switch on the BMS side but want to do something easy like a switch to stop the drain from the pack from the dc-dc converter (rather than unplugging the battery pack or the reducer directly). Any ideas? |
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08-27-2018, 09:38 AM | #162 |
Gone Wild
Join Date: Jan 2017
Location: Miami, FL
Posts: 1,061
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Re: Club Car Onward Leaf Lithium conversion
I did notice the 12v reducer draws a little more than I would like if I was to leave my cart unattended for some time without the charger plugged in. You are correct in that I don’t really notice it because my cart is plugged in all the time with how much I use it. Even if you don’t use your cart as much as I do, what’s the harm leaving it on the charger all of the time? I know lithium packs don’t “need” to be plugged in all the time like FLA packs but I don’t see a harm in it either.
If I was to go on vacation or something and wanted to play it safe I would just disconnect the big Anderson connector which completely isolates the pack. My older version EVMS-Lite is powered by 12v and not the tap harness like the newer BMS16v2, so I can quickly isolate the pack with just the main plug. However, when my BMS loses the constant 12v the SOC meter resets (similar to presets on a head unit). But if I go away and disconnect the pack I’ll just charge it when I get back so the SOC meter resetting to 100% because the 12v was disconnected isn’t an issue. You should be fine using a switch to shut the 12v reducer down completely. Just make sure it can handle the amperage, or use a relay. Although, the initial hit to charge the capacitor in the reducer may be brutal on the switch or relay. You may want to add some sort of precharge resistor or something so you don’t fry switches. I’m not positive on this as I’m not an electrical engineer but I do see how it could be a possibility. There are enough electrical guru’s on here that will know the answer to that one. |
09-01-2018, 06:52 AM | #163 |
Flat Out Hooked on Carts
Join Date: Nov 2011
Location: Miami, Florida
Posts: 1,115
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Club Car Onward Leaf Lithium conversion
You could always wire the reducer into the keyswitch so that the accessories only come on when the key is on, more like that of a car. I have a Harley ignition switch with two positions, one turns on the accessories and the next turns on the controller and allows the solenoid to engage with the accelerator.
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03-03-2019, 05:55 PM | #164 |
Not Yet Wild
Join Date: Jan 2017
Posts: 27
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Re: Club Car Onward Leaf Lithium conversion
Nice build. Been following for awhile. Really admire the attention to detail.
I purchased a plug and play pack from China - 48V 100ah. Built to fit my cart, completely sealed in a metal box (I use it for hunting, so I wanted it out of the elements. It awesome on weight reduction and range. I did manage to fry my BMS just prior to end of our hunting season. Waiting on a replacement, and I'll try to get it back up without blowing myself up. And then a controller upgrade. I can tell it gets stressed, especially since I'm also running 25 inch mud tires. However, I want to build one of these from scratch as you did, and do it with a 72V Bad Boy Buggy 4x4. They have all of the upgraded stuff already - 4 wheel brakes, independent suspension, controller, etc. Anyway, thanks again for sharing. Some of us are not electrical dummies, but watching you build yours helps educate other DIY's who are interested in lithium upgrades. |
03-26-2019, 08:37 AM | #165 |
Gone Wild
Join Date: Jan 2017
Location: Miami, FL
Posts: 1,061
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Re: Club Car Onward Leaf Lithium conversion
Folseman, thank you for the compliments.
When swapping your BMS with the new one, assuming it’s a direct replacement, be sure to check your tap harness wiring with a meter if the tap harness wires go directly to the BMS without a plug just to be on the safe side. This may be overboard but better safe than sorry. Each tap wire should increase by 3.5 volts (or whatever your cell voltage is at the time) every time you go to the next wire. If you go to the next wire and the voltage goes up by more than that, you skipped over a cell. For me, the tap harness was the most confusing/daunting part at first. But after I did it, it’s a piece of cake. Now after helping some others build a pack, I don’t even need the tap harness wiring diagram. I’m curious how your pack works out long term. I’m usually leery about stuff like this from China, but am all about more options than just Leaf or Volt cells. |
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