Lithium ion batteries

Patela2oh · 12-08-2016, 08:46 AM

Quote:

Originally Posted by PingEye3

Here is a picture of a 7 module 58V pack from HAC in a Yamaha as well. There is an on board charger and DC-DC Converter and still has room for your bar.

Is that the premade 3200Wh or 6400Wh pack?

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Volt_Ampere · 12-08-2016, 09:15 AM

That would be the 3200Wh (about 60AH) The 6400 is 14 modules (120AH)

Patela2oh · 12-08-2016, 11:02 AM

Quote:

Originally Posted by Volt_Ampere

That would be the 3200Wh (about 60AH) The 6400 is 14 modules (120AH)

How far / long can you drive on it?

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Volt_Ampere · 12-08-2016, 02:30 PM

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.

PingEye3 · 05-03-2017, 08:31 AM

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 'r

eally' become boat anchors when fully discharged. That was 6 weeks ago.

NCPW · 05-03-2017, 11:27 AM

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?

theboss20 · 05-03-2017, 03:36 PM

Doesn't the BMS monitor the battery pack all the time and keep it balanced? Or am I missing something?

Jim C · 05-09-2017, 04:54 PM

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.

PingEye3 · 05-10-2017, 01:16 PM

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.

12-08-2016, 09:15 AM	#32
Volt_Ampere Gone Wild Join Date: May 2012 Location: Rio Verde, Az Posts: 7,171	Re: Lithium ion batteries That would be the 3200Wh (about 60AH) The 6400 is 14 modules (120AH)

12-08-2016, 02:30 PM	#34
Volt_Ampere Gone Wild Join Date: May 2012 Location: Rio Verde, Az Posts: 7,171	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.

05-03-2017, 08:31 AM	#35
PingEye3 Gone Wild Join Date: Sep 2014 Location: Orlando, FL Posts: 1,308	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.

05-03-2017, 11:27 AM	#36
NCPW Just Gone Join Date: Sep 2015 Location: North Carolina Posts: 3,549	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?

05-03-2017, 03:36 PM	#37
theboss20 Gone Wild Join Date: Jun 2014 Location: Green Valley, Az Posts: 678	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
Jim C Gone Wild Join Date: Oct 2008 Location: Wildwood, FL Posts: 742	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
PingEye3 Gone Wild Join Date: Sep 2014 Location: Orlando, FL Posts: 1,308	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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