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12-08-2016, 08:46 AM | #31 |
Gone Wild
Join Date: Mar 2016
Posts: 264
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12-08-2016, 09:15 AM | #32 |
Gone Wild
Join Date: May 2012
Location: Rio Verde, Az
Posts: 7,173
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Re: Lithium ion batteries
That would be the 3200Wh (about 60AH) The 6400 is 14 modules (120AH)
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12-08-2016, 11:02 AM | #33 |
Gone Wild
Join Date: Mar 2016
Posts: 264
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12-08-2016, 02:30 PM | #34 |
Gone Wild
Join Date: May 2012
Location: Rio Verde, Az
Posts: 7,173
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Re: Lithium ion batteries
I really do not have a precise answer. I estimate I can do about 4 rounds of golf with the 14 module pack. The 7 module would be half as much. I like to have margin so I charge when I get down to about 25%. You can NOT let lithium batteries ever go below the critical minimum voltage or they will be expensive junk.
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05-03-2017, 08:31 AM | #35 |
Gone Wild
Join Date: Sep 2014
Location: Orlando, FL
Posts: 1,308
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Re: Lithium ion batteries
A 58V pack that I recently installed was left with the key on and no charger plugged into the pack for a week during spring break. TOTAL PACK voltage dropped to 3.72V. Obviously too low for the lithium charger to start and bring the pack back up. After talking with Nick at HAC, I took a standard Powerwise 36V charger with its old charging receptacle and connected it to the pack and in 15 minutes the pack voltage was high enough for the on board lithium charger to take over. I was able to monitor the restoration of the pack by connecting to the pack with the WiFi built into the BMS from HAC. Pack was fully charged in 4 hours and has had no issues and same range as before the discharge. The owner is very thankful that they do not 'really' become boat anchors when fully discharged. That was 6 weeks ago.
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05-03-2017, 11:27 AM | #36 |
Just Gone
Join Date: Sep 2015
Location: North Carolina
Posts: 3,549
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Re: Lithium ion batteries
That's awesome Ping! Did you have to re-balance the pack again due to the low voltage or did all cells stay pretty close together?
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05-03-2017, 03:36 PM | #37 |
Gone Wild
Join Date: Jun 2014
Location: Green Valley, Az
Posts: 678
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Re: Lithium ion batteries
Doesn't the BMS monitor the battery pack all the time and keep it balanced? Or am I missing something?
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05-09-2017, 04:54 PM | #38 |
Gone Wild
Join Date: Oct 2008
Location: Wildwood, FL
Posts: 742
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Re: Lithium ion batteries
Ping, that's comforting to know, even though I have low voltage cut offs.
My pack has been in for a year now, and my friend's 7-8 months, checked balance and they are not even a hundredth of a volt off, with no BMS. |
05-10-2017, 01:16 PM | #39 |
Gone Wild
Join Date: Sep 2014
Location: Orlando, FL
Posts: 1,308
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Re: Lithium ion batteries
When I brought the pack back to life, there was no imbalance after using the 'start' charge with the EZGO charger. No imbalance after the lithium charger completed charging. The pack is in great shape.
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