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Old Yesterday, 01:44 PM   #1
bbooth1986
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Mixed Breed
 
Join Date: Nov 2022
Location: Houston, TX
Posts: 1
Default Zone Golf Cart | Navitas 600a Controller | BigBattery Lithium Upgrade = SLOW??

I have a 2010 Zone 48v 6 passenger golf cart, which was previously running 8 Lead Acid Trojan batteries, through a Curtis 1268 controller. It was running great, but the batteries were getting weak on hills and depleting quicker than normal.... I decided to jump headlong into Lithium.

Step 1: I purchased 2 BigBattery Badger (2nd Gen) 48V lithium batteries.

These are the units: https://bigbattery.com/products/48v-...mc-48ah-2-1kwh

- Outcome:
I installed them and the cart was painfully slow and seemed to be in a limp mode. 3-4 MPH top speed

- Troubleshooting:
I called BigBattery, they informed me I needed 2 more batteries to be able to run my controller/motor. I begrudingly sent them another $2k

Step 2: 2 more batteries arrived, installed them both

- Outcome:
Same limp mode.... !!!!!

- Troubleshooting:
I called BigBattery, who insisted my controller was the culprit and I needed to upgrade, which they suggested a Naviatas 600amp unit.

Step 3: I dropped $900 on a Naviatas 600amp controller, and installed it....

- Outcome:
After some persuading, it is faster than limp mode but not even close to the power I had with the old lead acid batteries and curtis controller. It **** near squeals the tires on initial throttle application, but then the torque completely dies off and it slowly arrives at a top speed of ~16MPH. On hills is slows down to 12-13MPH.

- Troubleshooting:
I fortunately now get diagnostics with Navitas, which indicates a "Low Battery Limiting" fault. I called Navitas and they did some tweaking, which fixed the fault but not the speed. Navitas thinks its the batteries, Big Battery thinks its the controller or something else. The Low Battery Limiting error also came back this morning, and they are fully charged....

I am about to give up.... please, before I drop this thing in a lake... any thoughts on what the issue(s) might be?

Last edited by bbooth1986; Yesterday at 01:45 PM.. Reason: Removing an unintended emoji
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Old Yesterday, 03:07 PM   #2
Pat911
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Club Car
 
Join Date: Dec 2020
Location: Melbourne, Australia
Posts: 822
Default Re: Zone Golf Cart | Navitas 600a Controller | BigBattery Lithium Upgrade = SLOW??

The bigBattery BADGER is not a real 48v battery. It is NMC chemistry so to be a 48v nominal battery it should have 14 cells in it, or 14S configuration which would give it a 51.8v nominal/58.8v max voltage. The BADGER is only 12S configuration, it only has 12 cells which is 2 short of what it should have. Voltage is 44v nominal and 50.4v max.

The voltage is too low for the controller. The problem is the battery, not the controller.

Cheers
Pat.
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