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07-17-2019, 10:14 AM
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#1
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Senior Member
Winnebago Owners Club
Join Date: Sep 2009
Location: Spring Branch, TX
Posts: 2,987
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Cheap LiPo 12v batteries
I just saw this. Cheap used 12v LiPo batteries from the medical industry.
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2017 Winnebago Adventurer 37F
2016 Lincoln MKX Toad
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07-17-2019, 11:03 AM
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#2
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Registered User
Join Date: Apr 2016
Posts: 370
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Interesting
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07-17-2019, 11:46 AM
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#3
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Senior Member
Join Date: Jul 2018
Posts: 2,812
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Will be watching Craigslist.
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Foretravel tag axle 40 ft. 500 hp/1550 ft/lbs ism 1455 watts on the roof. 600 a/h's lithium down below.
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07-19-2019, 03:14 PM
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#4
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Senior Member
Join Date: Dec 2016
Location: Indianapolis
Posts: 160
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If you look at the comments below the video, these batteries are no longer available and if they do come up for sale they are much more expensive. This video created a high demand for a very limited supply...
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2016 Jayco Alante 31v
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07-19-2019, 03:36 PM
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#5
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Senior Member
Join Date: Apr 2017
Posts: 257
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I bought one of these last year
https://www.aliexpress.com/item/Free...610017946.html
and one thing to note is that the BMS does not seem to allow it to start the generator on its own...had to aux start with chassis battery.
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07-20-2019, 06:24 AM
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#6
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Senior Member
Newmar Owners Club Spartan Chassis
Join Date: Oct 2014
Location: Lake McClure, CA
Posts: 1,449
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I bought 7 of these direct from mfg. in China. Took 20 days to make them and 25 days shipping and delivered to my door. Went thru Alibaba.com, they hold the money until I receive and inspect them. Project was complete on 7-9 and so far they work perfect. Under $ 4000 for 1400AH it was worth a try. Meter shows voltage, capacity, temp. Wasn't easy to fit 7
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2018 Dutch Star 4369 Spartan Chassis
2016 Jeep Cherokee, 1952 Willys CJ3A
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07-20-2019, 11:24 AM
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#7
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Senior Member
Join Date: Apr 2017
Posts: 257
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Quote:
Originally Posted by 10 fan
I bought 7 of these direct from mfg. in China. Took 20 days to make them and 25 days shipping and delivered to my door. Went thru Alibaba.com, they hold the money until I receive and inspect them. Project was complete on 7-9 and so far they work perfect. Under $ 4000 for 1400AH it was worth a try. Meter shows voltage, capacity, temp. Wasn't easy to fit 7
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Very nice setup...Is it 7 in parallel? Do you have fuses or breakers between each battery in case one goes bad?
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07-20-2019, 12:19 PM
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#8
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Senior Member
Newmar Owners Club Spartan Chassis
Join Date: Oct 2014
Location: Lake McClure, CA
Posts: 1,449
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All 7 in parallel, 12v I made buss bars, no fuses for each battery. 400a fuse for each inverter, 150a fuse for house 12v and I put the original 350a inverter fuse on the cable going to the bi directional relay because there was no protection.
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2018 Dutch Star 4369 Spartan Chassis
2016 Jeep Cherokee, 1952 Willys CJ3A
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07-20-2019, 01:36 PM
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#9
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Senior Member
Join Date: Apr 2017
Posts: 257
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Quote:
Originally Posted by 10 fan
All 7 in parallel, 12v I made buss bars, no fuses for each battery. 400a fuse for each inverter, 150a fuse for house 12v and I put the original 350a inverter fuse on the cable going to the bi directional relay because there was no protection.
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Any concerns about so many in parallel? This question is not specific to lithium...I've seen caution on lead acid AGMs too.
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07-20-2019, 01:51 PM
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#10
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Senior Member
Excel Owners Club Winnebago Owners Club Ford Super Duty Owner
Join Date: Aug 2014
Location: Santa Fe, NM
Posts: 6,808
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Quote:
Originally Posted by Wbago97
Any concerns about so many in parallel? This question is not specific to lithium...I've seen caution on lead acid AGMs too.
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Understand potential charging issues with batteries in parallel. However, if all of the batteries are at very similar SOC and are wired in a balanced configuration what are the issues?
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Fred & Denise (RVM157) New Mexico
2007 Excel Classic 30RSO & Coach House 272XL E450
2007 RAM 3500, Diesel, 6Spd Auto, SWD, 4x4, CC & LB
[SIGPIC][/SIGPIC]
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07-20-2019, 03:14 PM
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#11
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Senior Member
Join Date: Apr 2017
Posts: 257
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Quote:
Originally Posted by rarebear.nm
Understand potential charging issues with batteries in parallel. However, if all of the batteries are at very similar SOC and are wired in a balanced configuration what are the issues?
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If one battery has a dead cell (for whatever reason), the others send current to it.
Admittedly I am still learning, and this was one of the caution notes with AGMs due to the low internal resistance.
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07-20-2019, 03:36 PM
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#12
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Senior Member
Excel Owners Club Winnebago Owners Club Ford Super Duty Owner
Join Date: Aug 2014
Location: Santa Fe, NM
Posts: 6,808
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OK, "very similar SOC" excludes one bad cell in a bank. A dead cell is an issue regardless if you have one battery or a bank of eight in parallel. Large off-grid battery systems may have many more than 8 batteries in various parallel configurations.
__________________
Fred & Denise (RVM157) New Mexico
2007 Excel Classic 30RSO & Coach House 272XL E450
2007 RAM 3500, Diesel, 6Spd Auto, SWD, 4x4, CC & LB
[SIGPIC][/SIGPIC]
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07-20-2019, 05:14 PM
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#13
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Senior Member
Join Date: Jul 2014
Posts: 35,417
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A dead cell does not draw current to it. Only a shorted cell will do that.
Quote:
Originally Posted by Wbago97
If one battery has a dead cell (for whatever reason), the others send current to it.
Admittedly I am still learning, and this was one of the caution notes with AGMs due to the low internal resistance.
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07-20-2019, 06:13 PM
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#14
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Senior Member
Join Date: Jul 2018
Posts: 2,812
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Quote:
Originally Posted by twinboat
A dead cell does not draw current to it. Only a shorted cell will do that.
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So if a lithium battery, even in parallel with others, sees a "dead" [shorted or open] cell, will that battery BMS see that, and cut charging or discharge?
__________________
Foretravel tag axle 40 ft. 500 hp/1550 ft/lbs ism 1455 watts on the roof. 600 a/h's lithium down below.
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