Lifestand LSCO conversion to lithium

[Burgerman]

http://www.usastore.revolectrix.com/Pro ... sion-Cable

Get 4 or 5 of these.

[Burgerman]

I would also get him to swap the nasty black multi pin OBD2 connector as they are rubbish and will not be relable. Those make bad contact when new. Use the ones we all do. And only one connector needed too. No need for andersons at all.

These. All balance as well as 40A power.

[ICEUK]

The 36" cable is £18 from US store on 10 - 14 days delivery and out of stock in Singapore. It may be available in UK from Nexus on 01604 627 616

Singapore told me cables would ship mid june, i have four of the 36inch cables on order, i am going to make a spare lead up and i enjoy soldering.

[Burgerman]

http://www.wheelchairdriver.com/BM3-con ... -pl8v2.jpg

http://www.wheelchairdriver.com/BM3-con ... nector.jpg

http://www.wheelchairdriver.com/BM3-con ... le-40A.jpg

http://www.wheelchairdriver.com/BM3-con ... nector.gif

[shirley_hkg]

JST vs XH

[funkykeyboard]

http://www.wheelchairdriver.com/BM3-construction/charge-cables-pl8v2.jpg

http://www.wheelchairdriver.com/BM3-con ... nector.jpg

http://www.wheelchairdriver.com/BM3-con ... le-40A.jpg

http://www.wheelchairdriver.com/BM3-con ... nector.gif

You know what, I think I will. Do you have a link when I can purchase these please?
http://www.wheelchairdriver.com/BM3-con ... nector.gif

So these connections are no good for the PL 8?

[funkykeyboard]

And I need 1 of these too?

http://www.usastore.revolectrix.com/Pro ... /FUIM3_177

[Burgerman]

Abolutely not! Those will melt the first time you try and charge at high current. Use the same type that they do. Ebay. Not to mention that if you touch those together there will be a massive bang and melted cables. Use SAFE ones.

https://www.ebay.co.uk/itm/4x-Right-Ang ... SwLUResRm7

https://www.ebay.co.uk/itm/4mm-Banana-S ... SwyQtV4Eqk

https://www.ebay.co.uk/itm/Black-Red-4m ... 0010.m2109

https://www.ebay.co.uk/itm/4mm-Banana-S ... Swd0BV4G31


Only use these 3 types, exact types! Not some that dont claim 30/32/36A. Theres a few very similar clones that do melt... And damage the PL8. All the rest are no use. These are actually safe at 40A if not hot swapped. They are the same as the Revolectrix ones.

[funkykeyboard]

Do you have a link when I can purchase these please?
http://www.wheelchairdriver.com/BM3-con ... nector.jpg
Any advice appreciated, Tremulous Tetra. :-)

[shirley_hkg]

viewtopic.php?f=2&t=8792&p=136862&hilit=13w6#p136862

[funkykeyboard]

So I have these power leads already built. They have an in-line fuse in the positive and negative. 32 V. I'm figuring that 32 V won't be enough for charging from the PL 8 with a Shirley power supply?



If I do need to replace the in-line fuse, what do I need to replace them with please?

Any advice appreciated, Tremulous Tetra. :-)

[Burgerman]

They are fine.

[Burgerman]

They are fine.

[funkykeyboard]

So I have these power leads already built. They have an in-line fuse in the positive and negative. 32 V. I'm figuring that 32 V won't be enough for charging from the PL 8 with a Shirley power supply?



If I do need to replace the in-line fuse, what do I need to replace them with please?

Any advice appreciated, Tremulous Tetra. :-)

so what do these protect me from?

I just made up a cable to charge my life stand wheelchair, I did not put any of these in-line fuses in the cable, do I need them? I notice Steve didn't put any in his, so I'm figuring you.really need them?
Any advice appreciated, Tremulous Tetra. :-)

[Burgerman]

That depends. On many things. Not enough info. They protect the cables. I have heavy cables because I charge at up to 100A and because I jump start cars etc... Your case may be different. Not enough info. Remember a battery can giv 1000 amps or more if you short a cable.

[ex-Gooserider]

Many DC fuses and switches are only rated for 32V or some other value because of DC's tendency to arc when disconnected if there is enough voltage to jump the gap created by the circuit opening... A 32V DC fuse is designed to open a big enough gap when it blows to prevent any arcing at 32V, but might arc at (say) 60V. The ratings are conservative so you can generally get away with pushing them a bit, but don't go to far....

AC is less of a problem for reasons I won't go into that relate to the differences between AC and DC.... Generally it is OK to use DC rated fuses, switches, etc. on AC, but using AC stuff on DC over about 12V can be problematic if it doesn't have a DC voltage spec.

The fuse will NOT protect the electronics - it common knowledge in the electronics world that the purpose of expensive electronics parts is to protect cheap fuses by blowing FIRST...

What the fuse will do is protect your wiring - without the fuse a short can pull as much current as the source can supply, and that leads to heat, which leads to fires, etc... If the fuse is properly sized, it will blow before the wiring gets hot enough to be a problem....

ex-Gooserider

[Kssisk]

Thinking of making a battery. My mk group 34 gels are not holding a charge anymore. The chair has 2. Trying to get the $. If I can how and where do I attach the balance wires and series? This would be my first https://www.ebay.com/itm/100Ah-12v-LiFe ... 3170562442
Thank you in advance

[Burgerman]

You need to plan a little first.

You will need around 150Ah or so to use low C rate cells long term in a powerchair. Or they will not last as long as you expect and may suffer too much voltage drop under heavy loads. Generally now we are looking at 170, 180, 200, 210Ah in full sized powerchairs. That means a long service life, enormous range, enough weight to offer a little stability, still lighter than lead. And you can charge half as often. That alone means you doubled the lifespan again!

So you really need to be looking at maybe 8x 176Ah cells, or 16x 100Ah cells to give 200Ah or similar.

So your battery compartment is capable of taking 2x group 34 MKs. Thats 260 x 170mm x twice, but how high can you fit?

[Kssisk]

BM- thank you.
I do not have the $ to make mistakes. so I spend a lot of time researching.
The controller is on a slide out in the battery area above the battery. There is literally no room between the top of the battery and the slide.
I am willing to learn.... the forum here is great.

[Burgerman]

So how many inches of height or mm do you have in the batt compartment?

[Kssisk]

178mm in height

[Kssisk]

The battery rubs on the sides (w)
And hits the door (l).
And the front battery compartment is the same

[Burgerman]

So for e.g these would be perfect for a grp 24 battery (same size as yours but 220 high)

So these would not fit https://www.rj-lithium.com/sale-1153865 ... orage.html

You need to search the web, and places like https://aliexpress.com/ to find the best capacity that will fit into a 260 x 170 x 170h space. Its not easy. Which is why you should buy chairs that fit grp24 battes idealy!

[Kssisk]

I agree. It is a love-hate relationship with my chair. First one.
Thank you for your help.
I will keep looking for a cell that will work.

[Burgerman]

Thats not to say a smaller cell wont work. But its a matter of degree.

You will get around 35Ah from a lead 60Ah grp 34. Becaue of a thing called Peukert - who was an evil man.

So if you div your lithium 100Ah capacity by 35 you will get 2.8 times the range. Which is OK.
If you manage to fit a 160Ah battery, then you get 4.6x as much range. And because you are discharging it at a lower Amp per Ah (C rate) and because its got enough range to charge less often, you also double the lifespan. So it makes economic sense too.

If you leave a safe 10 mile reserve, then it makes even more sense with a bigger pack too, as thats less of a percentage og a larger pack. So in reality the range difference if increased further.

But grp34 a difficult size to try and fit. I have looked before. So you may not have that option.

[Kssisk]

If I lay them flat and stack them depending on the battery I can get 135 to 165 ah

[Burgerman]

Thats better! Remember to allow 1 to 2 mm for some sort of seperation film between each cell. The cases are all negative and at different voltages.

[Irving]

If I lay them flat and stack them depending on the battery I can get 135 to 165 ah

Your best option is:

8 x 175Ah 174 x 40 x 205mm laid on their side will be 2 x 174 long, 170 high inc insulation, 215 wide inc wiring, so will fit in a 2 x GP34 footprint

[Kssisk]

Good advice
Thank you both

[funkykeyboard]

If I lay them flat and stack them depending on the battery I can get 135 to 165 ah

Your best option is:

8 x 175Ah 174 x 40 x 205mm laid on their side will be 2 x 174 long, 170 high inc insulation, 215 wide inc wiring, so will fit in a 2 x GP34 footprint

what did you use for installation Irving?