02-19-2021, 06:25 PM | #1 |
Getting Wild
Join Date: Jan 2010
Location: CA Bay Area
Posts: 110
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Going lithium with the NAVITAS 440 ac kit
So I would like some reassurance on the batteries that I purchased for my club car. What I’m wondering is will these batteries BMS shut down due to the navitas 440a controller being converted from 48v to 72v? Here is the kit I purchased along with the navitas controller and motor. I’m not an expert on figuring this kind of crap out, any feedback would be much appreciated, thanks.
Lithium batteries: https://bigbattery.com/products/48v-bdgr-kit-of-2/ Controller: https://www.navitasvs.com/tac2 Motor: https://docs.wixstatic.com/ugd/86af4...1d0d18e58c.pdf |
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02-19-2021, 10:03 PM | #2 |
Getting Wild
Join Date: Dec 2011
Location: Colorado Springs, CO
Posts: 83
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Re: Going lithium with the NAVITAS 440 ac kit
The Navitas controller does not convert 48v to 72v, it converts DC battery current to AC current for the motor. I think you were looking at the acceptable input voltage of the controller which is 48 to 72V. Those batteries show a max continuous discharge rate of 126A, and a peak of 250. I don’t have any experience with that controller, but I’d say you’d be cutting it close. A lot would depend on your cart setup (larger tires, lift, etc.). Those would all increase discharge current. My stock controller RXV (an AC cart) with 23” tires for example can pull 250A on accel or climbing hills loaded up.
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02-19-2021, 10:12 PM | #3 | |
Getting Wild
Join Date: Jan 2010
Location: CA Bay Area
Posts: 110
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Re: Going lithium with the NAVITAS 440 ac kit
Quote:
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02-20-2021, 11:16 AM | #4 | |
Gone Wild
Join Date: Oct 2019
Posts: 646
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Re: Going lithium with the NAVITAS 440 ac kit
Quote:
Based on what I've seen on the forum, the Navitas AC systems seem to be easier on the batteries than some of the beefy DC systems. You can also set a max current parameter, and you definitely can make it work if you ease back on that parameter in the setup. I've noticed it doesn't make as big a difference as you might think dialing back on this somewhat. My experience is with my Tac2 600a controller and the 5kw motor (in an Onward), and having used it with a RoyPow 105Ah 51v battery and now a similar generic type that is 120AH 72V. I'm in an area w/out hills though. Please keep us posted on how it works out! |
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02-20-2021, 04:49 PM | #5 |
Gone Wild
Join Date: Jan 2021
Location: E. Bay, CA USA
Posts: 184
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Re: Going lithium with the NAVITAS 440 ac kit
I'd go with a third battery in parallel if I were you--over 90AH seems to what multiple sources suggested to me, although I think there are commercial carts running ~60 AH so you may be ok (not sure if that's with AC motor or not?)
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02-20-2021, 11:34 PM | #6 | |
Getting Wild
Join Date: Jan 2010
Location: CA Bay Area
Posts: 110
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Re: Going lithium with the NAVITAS 440 ac kit
Quote:
Yeah the AC systems are a bit easier in the power supply from what I’ve been reading. So I just heard back from navitas and they said I could adjust my controller to fit the batteries BMS. so ill start from there when I get the batteries installed and see how she does. I’ll for sure keep this thread posted along with photos. Yeah I’m going to try this set up first for a bit then see about adding a third. I don’t go far in the cart, just to the park and down town a bit, max 6 miles round trip if that. Is 66ah roughly 30miles on one charge? I mean give or take the conditions and the components. (This is the stuff I’m still learning) I would never imagine going that far anyway but that would defiantly exceed my limits. Correct me if I’m wrong but from what I’ve read more battles in parallel just gets you more AH not voltage correct? If that’s the case, I’ll put that money toward more beer. |
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02-21-2021, 11:21 AM | #7 |
Gone Wild
Join Date: Apr 2020
Location: Hurricane, Utah
Posts: 2,795
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Re: Going lithium with the NAVITAS 440 ac kit
Batteries in parallel will increase the AH and keep the voltage the same; correct.
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02-21-2021, 11:44 AM | #8 |
Getting Wild
Join Date: Dec 2011
Location: Colorado Springs, CO
Posts: 83
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Re: Going lithium with the NAVITAS 440 ac kit
I think 30 miles is unlikely with 66ah. Remember, if you want your batteries to last you won’t be able to use all 66ah. Most people discharge to around 80% of total capacity, which in your case would be 53 usable amp/hours. Based on my similar leaf setup, I would get around 20 miles. It also depends on how heavy your right foot is. You’ll have no problem with the mission you described though.
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02-21-2021, 12:39 PM | #9 | |
Gone Wild
Join Date: Oct 2019
Posts: 646
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Re: Going lithium with the NAVITAS 440 ac kit
Quote:
20 miles if you have similar uphill / downhill amounts and the grades aren't too steep sounds like a good number I'd venture to guess, while keeping your battery at ideal voltage levels for maximum cycle life. |
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02-21-2021, 02:25 PM | #10 |
Getting Wild
Join Date: Jan 2010
Location: CA Bay Area
Posts: 110
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Re: Going lithium with the NAVITAS 440 ac kit
Awesome! I appreciate all the information guys it really helps. I can’t wait to get these batteries installed and get this bad boy going. Bigbattery said they are receiving the back ordered parts to complete this battery setup and hopefully get them shipped out by the end of the week. I’ll keep the thread updated.
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