PINNED - Lithium battery conversion/info

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Re: PINNED - Lithium battery conversion/info

Postby terry2 » 11 Feb 2019, 11:52

Scooterman wrote:
terry2 wrote:
What is the size of 1 cell?

90Ah



I should of said Width...Depth..height sorry
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Re: PINNED - Lithium battery conversion/info

Postby Gnomatic » 11 Feb 2019, 18:11

W130mm x D36mm x H200mm
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Re: PINNED - Lithium battery conversion/info

Postby terry2 » 11 Feb 2019, 21:01

Gnomatic wrote:W130mm x D36mm x H200mm



Thank you.
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Re: PINNED - Lithium battery conversion/info

Postby shirley_hkg » 12 Feb 2019, 00:12

:cussing banghead
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Re: PINNED - Lithium battery conversion/info

Postby Burgerman » 12 Feb 2019, 01:46

You appear to have some bad connectons there!
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Re: PINNED - Lithium battery conversion/info

Postby shirley_hkg » 12 Feb 2019, 02:32

Never had such messy graph ever. It was all over my screen . banghead

I thought of loose connection in the first instance , but the connectors are solid copper and I use spring lock washers as well. The current was low , 22A only, limited by XLR plug .


I once worried it were cells internal resistance .

I re-examined all connections and tightened a few. It went better for a while only , or jumped from one connection to another connection .

The connectors are 1.2mm thick solid copper . Cell terminals are aluminum .
Dare not to over tighten it.

Gave up finally . Removed all of them . Re-connect with ordinary wire to see what's the result .

It seems everything OK now . Waiting my chair to go empty to receive a 170Ah discharge .

I think the copper connector is too strong for the aluminum terminal , that I can't apply enough pressure to create enough contact between the two.

May get thinner copper strips instead .
Any suggestion ?
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Re: PINNED - Lithium battery conversion/info

Postby Burgerman » 12 Feb 2019, 03:15

Dont use bus bars. Use those Ring terminals and cables. Some bad connection somewhere.
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Re: PINNED - Lithium battery conversion/info

Postby expresso » 12 Feb 2019, 05:56

i would have taught that those buss bars would have been great - solid - good connections etc, - i guess all the fuss i was worried about when i got my buss bars that were what i though very thin - i doubled up on mines and they made a good connection. i made sure the bolts were tight and locktite them.

so too thick is not good then either - good to know - if using cables and rings - would have to double up on some of them ? takes a bit more time to make the cables but they do work well - i did it for my 60ah ADD ON and its solid connection.
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Re: PINNED - Lithium battery conversion/info

Postby terry2 » 12 Feb 2019, 06:07

I don't know which cells to go for :(

These https://www.lifepo4-batteries.com/sale- ... f-car.html

Unknown company here or get 16 cells from shirley_hkg.
I suppose getting the 8@176Ah would be easier? I have no clue what to do :( HELP :)
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Re: PINNED - Lithium battery conversion/info

Postby Scooterman » 12 Feb 2019, 08:49

Sometimes they shellac Cooper bus bars which needs removing. I guess it's applied to prevent oxidisation?

Maybe it's faux copper :lol:
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Re: PINNED - Lithium battery conversion/info

Postby terry2 » 12 Feb 2019, 09:08

Scooterman wrote:Sometimes they shellac Cooper bus bars which needs removing. I guess it's applied to prevent oxidisation?

Maybe it's faux copper :lol:



Made me laugh :D
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Re: PINNED - Lithium battery conversion/info

Postby Scooterman » 12 Feb 2019, 09:28

terry2 wrote:I suppose getting the 8@176Ah would be easier? I have no clue what to do :( HELP :)

Less connections, less chance of screwing up and going BANG! :ambulance hanged
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Re: PINNED - Lithium battery conversion/info

Postby terry2 » 12 Feb 2019, 09:47

Scooterman wrote:
terry2 wrote:I suppose getting the 8@176Ah would be easier? I have no clue what to do :( HELP :)

Less connections, less chance of screwing up and going BANG! :ambulance hanged



Very true.
I have ordered the 8@176Ah.
After paying for these, I'm stopping in for this year now :D
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Re: PINNED - Lithium battery conversion/info

Postby Scooterman » 12 Feb 2019, 09:59

terry2 wrote:I have ordered the 8@176Ah.
After paying for these, I'm stopping in for this year now :D

:thumbup:
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Re: PINNED - Lithium battery conversion/info

Postby Burgerman » 12 Feb 2019, 10:54

You wont be needing the battery then. So you can lend it to me for a year. :thumbup:

I felt the same after xmas when I had to pay about 3k for carpets, OLED TV, sofa, 2 chairs, lighting, and other incidentals after my leak problem.
Then a week later, my washing machine and dryer failed within hours... And 2 days later my fridge/freezer, and central heating boiler. Another 2k+ later we are back to where we started. And bankrupted! :fencing :cussing :thumbdown: banghead

Now need to spend nothing for about a year.

The problem with copper is that even if cleaned with steel wool or abrasive paper it oxidises instantly. Better to use tinned or plated stuff. And those spring washers make things worse. You want flat washers, stainless cap screw bolts, and a little loctite on the THREAD only. And because the cells move, the solid bars are worse. Better to use ring terminals, soldered wires. Nothing moves.
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Re: PINNED - Lithium battery conversion/info

Postby terry2 » 12 Feb 2019, 11:27

Burgerman wrote:You wont be needing the battery then. So you can lend it to me for a year. :thumbup:

I felt the same after xmas when I had to pay about 3k for carpets, OLED TV, sofa, 2 chairs, lighting, and other incidentals after my leak problem.
Then a week later, my washing machine and dryer failed within hours... And 2 days later my fridge/freezer, and central heating boiler. Another 2k+ later we are back to where we started. And bankrupted! :fencing :cussing :thumbdown: banghead

Now need to spend nothing for about a year.

The problem with copper is that even if cleaned with steel wool or abrasive paper it oxidises instantly. Better to use tinned or plated stuff. And those spring washers make things worse. You want flat washers, stainless cap screw bolts, and a little loctite on the THREAD only. And because the cells move, the solid bars are worse. Better to use ring terminals, soldered wires. Nothing moves.


I know how you feel.
The 8 cells with nuts\washers and connectors. Came to £1,000. I just hope they don't get to me with tax!

My daughter said I can sell my Vive VR headset to pay for the rest of what I need.
Pooing bricks at the moment.
What is the best way to check my PL8 when it comes today?
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Re: PINNED - Lithium battery conversion/info

Postby Burgerman » 12 Feb 2019, 11:28

Use it.

Connect to PC, CHECK for 3.33 firmware, load a few presets from on here, and make a cable to charge a lead chair and test.
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Re: PINNED - Lithium battery conversion/info

Postby Scooterman » 12 Feb 2019, 11:33

Burgerman wrote:because the cells move, the solid bars are worse. Better to use ring terminals, soldered wires. Nothing moves.

I agree, I was thinking that as well. My scooter gets jolted about on 3rd world condition uk roads so flexible links (I.e. cable) would be better.
Btw What about braided copper links? Not easy to make a Decent hole in without it fraying :problem:
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Re: PINNED - Lithium battery conversion/info

Postby woodygb » 12 Feb 2019, 11:43

An expert is a person who has made all the mistakes that can be made in a very narrow field.
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Re: PINNED - Lithium battery conversion/info

Postby terry2 » 12 Feb 2019, 11:50

Burgerman wrote:Use it.

Connect to PC, CHECK for 3.33 firmware, load a few presets from on here, and make a cable to charge a lead chair and test.



XLR cable to?
I will post a picture of my PL8+ extras when it comes.
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Re: PINNED - Lithium battery conversion/info

Postby Scooterman » 12 Feb 2019, 11:52

woodygb wrote:https://www.cablecraft.co.uk/braided-earth-leads.html

Ooh yes nice one woody :thumbup: I shall have a peruse of that site later.
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Re: PINNED - Lithium battery conversion/info

Postby Burgerman » 12 Feb 2019, 11:55

I would use the flat ones as is. I would add a little solder to the round ones.
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Re: PINNED - Lithium battery conversion/info

Postby Scooterman » 12 Feb 2019, 15:19

Burgerman wrote:I would use the flat ones as is. I would add a little solder to the round ones.

Trouble is they're all a bit long, unless you bow the back up like a caterpillar. It's a shame i will have a look for some shorter ones. :ebay Plus they are pretty expensive for what they are. Although that is £ per pack. How many in a pack i wonder? :problem:
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Re: PINNED - Lithium battery conversion/info

Postby expresso » 12 Feb 2019, 17:02

those would be nice the branded links - its getting the correct size i think would be hard - i would try one and see how it fits - then order the rest to be safe -

do you need to heatshrink over them to be safe ? i would assume go for the higher rated amps - cant hurt - 200A model ?
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Re: PINNED - Lithium battery conversion/info

Postby expresso » 12 Feb 2019, 17:04

terry2 wrote:
Scooterman wrote:
terry2 wrote:I suppose getting the 8@176Ah would be easier? I have no clue what to do :( HELP :)

Less connections, less chance of screwing up and going BANG! :ambulance hanged



Very true.
I have ordered the 8@176Ah.
After paying for these, I'm stopping in for this year now :D



Nice - its great to use only 8 Cells and get so much power - :thumbup:
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Quickie S646se - 150Ah LifePo4
Quickie P220 - Indoor Chair
Bounder Plus - 180Ah LifePo4
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Re: PINNED - Lithium battery conversion/info

Postby terry2 » 12 Feb 2019, 17:28

Nice - its great to use only 8 Cells and get so much power - :thumbup:


:)
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Re: PINNED - Lithium battery conversion/info

Postby terry2 » 12 Feb 2019, 17:29

New PL8 plus ectras

@BM
what profile do I need for charging my MK batteries with the PL8?
Thanks
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Re: PINNED - Lithium battery conversion/info

Postby Burgerman » 12 Feb 2019, 18:08

Theres a lot floating about.

http://www.wheelchairdriver.com/PL8v2-Presets

Specifically these three zipped here! http://www.wheelchairdriver.com/PL8v2-P ... LR%20SAFE/
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Re: PINNED - Lithium battery conversion/info

Postby Scooterman » 12 Feb 2019, 18:29

Could this be causing the problem Shirley?

Maybe there's slightly different current going down the two series links? Why not try it with just a single link, you don't need two.
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Re: PINNED - Lithium battery conversion/info

Postby terry2 » 12 Feb 2019, 18:40

Burgerman wrote:Theres a lot floating about.

http://www.wheelchairdriver.com/PL8v2-Presets

Specifically these three zipped here! http://www.wheelchairdriver.com/PL8v2-P ... LR%20SAFE/


Thank you.
I will make a lead up in the morning and try it.

BM how many days Volts should the PL8 have?
My charger goes from 15-30V
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