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Forum Index : Solar : charging 2 x 12v lithiums with inbuilt BMS and a ha01 balancer

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rgormley
Senior Member

Joined: 22/02/2006
Location: Australia
Posts: 243
Posted: 10:27am 14 Jan 2023
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i have purchased 2 x 12v 100AH lithium batteries
maybe should have asked here before i bought them...
I asked the seller if they can be put in series to make 24v he said no  

so i asked if i can use a lithium balancer, he said the manufacture does not recommend them. but did not outright say no.

so my question is...

if the batteries each have a inbuilt 50 amp BMS and have over charge protection
(also temperature and discharge protection)

and i can set my inverters charge voltage to 29.2V and i can limit the output current to 20amps put on a battery balancer  (HA01)

Would this work? as i`m limiting the charge voltage to 29.2v and current to 20 amps.

Cheers,
Richard
specs below

-----------------------------------------------------------------------------------
Nominal Capacity: 100Ah
Nominal Voltage: 12.8V
Charge Voltage: 14.6V
Watt Hour: 1280Wh
Discharge Cut-off Voltage: 10V
Charge Method: CC/CV
Charger: 14.6V20A
Max.Charge Current: 50A
Max. Discharge Current: 50A
Cycle Life: 2000times
Warranty: 2 Years
Dimension: L306xW169xH215mm
Working Temperature Range: Charge: 0C to 45C.Discharge: -20C to 50C
Storage Temperature: -10C to 50C
Series Connection: No
Parallel Connection: No




The 12V 100Ah Lithium battery is built-in Grade A battery cells, with better performance and longer life , they're easy to store in a car or caravan on your next adventure. Battery Management System monitors and optimises each cell within the battery during normal operation, protecting it from over-charge, over-discharge, overheating and short-circuiting. Let us power your next adventure with this features packed lithium battery !


https://www.ebay.com.au/itm/124212208410?hash=item1ceb9fe31a:g:uucAAOSwus1jwPFL&amdata=enc%3AAQAHAAAA4GZBk%2B8dVYdSWTh%2B3fOCe%2F7ATAeoEH%2FqrZz1iqx%2BHPshAtm7prMH0q4Q4nUP%2Bxur%2BoJWYtl28SQqr8MPR%2BHWoDaEebAhyMXPPixN%2FS7Z3%2Bb9lZgW56kS10Gk02iZs71Y3jxoRl7CcaXDDiBxh1DonJCB0iXLA2A%2BZbLD8J7KF4jh2%2Bw4fY8qYCAV%2BuXhfDbNbLyyFA87A9TVNlkFoTmguhavcQcnHD6z3EgguY8GGeOGAjVlCL%2BP5V0psxW%2BoNFnOZOPnRxMIGo26VwTjGQTZwC%2FoGqSQjDpdItya7GcBgDw%7Ctkp%3ABk9SR8ihhf21YQ
 
Revlac

Guru

Joined: 31/12/2016
Location: Australia
Posts: 849
Posted: 11:01am 14 Jan 2023
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Most often they are not made to be run in series or parallel, they can work ok for some time (not always the case) if the charge current is low enough that the internal BMS can keep up, as you plan on 20amp orso that might help.

As for A grade, don't count on it, Have a look at some battery tear downs on the forum https://diysolarforum.com/ Somewhere
It would be better to take the top off the battery and put your own 24v BMS, even more so if it was for 48v system, I got crap for suggesting this before.
The danger zone would be the low voltage cutoff from a low cell and then you could have full battery voltage at the mosfet that switched off, the mosfets on these BMS may not be rated for the higher voltage several batteries in series.
Honestly there should be one BMS taking care of the entire battery "one cook in the kitchen"  

Those batteries look cheap enough to experiment with.
Cheers Aaron
Off The Grid
 
rgormley
Senior Member

Joined: 22/02/2006
Location: Australia
Posts: 243
Posted: 12:02pm 14 Jan 2023
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The danger zone would be the low voltage cutoff from a low cell and then you could have full battery voltage at the mosfet that switched off, the mosfets on these BMS may not be rated for the higher voltage several batteries in series.

ahh this explains the "why not factor" to me....

hhmm i`m a "diyer"  so maybe as you said, i can mod them and piss of the indiviual 12v BMS and add my own 24v BMS

hhmmm my theory of limiting the volts to 29.2 and the amps to 20A maybe good enough?
but i presume time will tell
 
Revlac

Guru

Joined: 31/12/2016
Location: Australia
Posts: 849
Posted: 03:32pm 14 Jan 2023
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Had another look at the Sellers site, I could not see if the BMS could give a live readout of cell voltage, would be helpful if it did, for this situation.

See how you go with it anyway.
Cheers Aaron
Off The Grid
 
rgormley
Senior Member

Joined: 22/02/2006
Location: Australia
Posts: 243
Posted: 10:44pm 14 Jan 2023
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maybe tear them apart, and use the 8 cells and make myself a 24v 50A batt
and put a daly 100A BMS  across them

https://www.ebay.com.au/itm/203914262296?chn=ps&_ul=AU&var=504371362721&_trkparms=ispr%3D1&amdata=enc%3A11LXF7s6sRzOEjm17op3HAA0&norover=1&mkevt=1&mkrid=705-139619-5960-0&mkcid=2&mkscid=101&itemid=504371362721_203914262296&targetid=&device=c&mktype=pla&googleloc=9071418&poi=&campaignid=15984321586&mkgroupid=&rlsatarget=&abcId=9300814&merchantid=614958124&gclid=CjwKCAiAwomeBhBWEiwAM43YIGEvZnDqLnm6ibcguawtxNwp5EqV1I9rREdCOcLxIDWMlMjCOR5RGxoC6NoQAvD_BwE
 
Revlac

Guru

Joined: 31/12/2016
Location: Australia
Posts: 849
Posted: 12:06am 15 Jan 2023
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I cant see any Bluetooth adaptor with that BMS, and therefor it cant send cell voltage and information to your phone.

Perhaps someone knows of a better option.

Also, are the battery lids clipped on, glued or plastic welded? If they are plastic welded it might be easier to go with the previous idea for a while to see how it works.
Cheers Aaron
Off The Grid
 
rgormley
Senior Member

Joined: 22/02/2006
Location: Australia
Posts: 243
Posted: 12:36am 15 Jan 2023
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i will sus out the batts when they arrive (still 5 days away)

BMS perhaps this one...

https://www.ebay.com.au/itm/284515650130?hash=item423e744a52:g:VfUAAOSwBXZjYyTa&amdata=enc%3AAQAHAAAA8HMYswQKaA3TmNA76dv3ri11%2B7Q2u7QXR%2FRg7npI1CD9GwVVgnX1KUznorM5vl71MGHXHVP4GNK8VPmax8KEEP8%2F9NOdqH%2FLsRyLxLc0oxF8QDUcM07UGAW7RORTWbFO4x%2FOjQPI8Qw5cP9Xj5izaWxk7W1BSyoDCy%2BCxVBB85q2k53dxJjJ%2BCZf9BePWFEo8aPvRbcl5nnXT5408C7JlP5Uh9ftkX42vmxTrC0bDXh43%2FsdcCJf1vsbUStAj533VXEa3QGZwuqeKFzjyru9NjweeIxNqRYys9jp4hVEqkAUOmaPBy0Uma9uNd%2F0nQ3oSQ%3D%3D%7Ctkp%3ABk9SR-CI_K22YQ
 
Revlac

Guru

Joined: 31/12/2016
Location: Australia
Posts: 849
Posted: 05:42am 15 Jan 2023
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Ok, That one will probably work, put it on the list of possible choices...........I had the 48v version it also had a light bar to show capacity, bit useless but it did have a little push button to wake up the BMS, used it sometimes.
Other things with DALY, recently they had a real stuff up with there firmware and everyone that had automatic updates had to put up with crap until it gets fixed.
Since I had the Automatic rubbish turned off I was unaffected by the Daly update.

For some entertainment and reviews of some BMS and other things,https://off-grid-garage.com/
Cheers Aaron
Off The Grid
 
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