Removing BMS & wiring in Pl8v2

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Re: Removing BMS & wiring in Pl8v2

Postby Burgerman » 09 Feb 2019, 19:41

It will take a while to try to balance the mess. Just let it, and when done post a screenshot.
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Re: Removing BMS & wiring in Pl8v2

Postby steves1977uk » 09 Feb 2019, 23:43

There was a reg file I uploaded somewhere on here that shows all hidden folders, files and extensions. Here... download/file.php?id=8890 Unzip and merge.

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Re: Removing BMS & wiring in Pl8v2

Postby grazy+1949 » 10 Feb 2019, 01:53

BM-GB-Presets-charge.jpg


Hi BM

Thanks for all your help and patience and for sharing your bespoke presets.PS8 file. Thanks also to the other members who helped me to remove my BMS from my pack and balance wire it to the Revolectrix Cellpro Powerlab 8v2. My pack has been subject to incredible abuse. It was charged for 2 years with a basic 10A (blind) charger and then I forced it to power a gross weight of 31 stone up a mountain road (gradients 20% to 30%) for 3 weeks, until it demonstrated a big drop in performance. It started to fail on me and the BMS would shut the battery down frequently.

Thanks to my wonderful wife for driving up mountain roads to recover me and my vehicle, several times.

I took the decision to go all Cellpro PL8v2, ie. an intelligent charging system with pack specific charging presets and cell balancing wires.

I will be very interested to see if the pack can recover with this market leading charging system and BM's fine tuned presets.

I am developing a prototype EV Rover for the adventurous Mobility user. I am going to need 48v and a lot of Ah. Nobody knows how many yet. I will eventually get there.

cheers

grazy+1949
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Re: Removing BMS & wiring in Pl8v2

Postby Burgerman » 10 Feb 2019, 10:54

I suspect the pack is pretty unhealthy. But at least it is FINALLY getting charged correctly. It was unbalanced on this charge (that mess on the graph) and may have high resistance cells. And is still too small capacity to do what you are doing. So is getting tortured still.

You now must use a CELL MONITOR. Never allow any cell to go below 2.9V stationary, or 2.5V under load. This is really only needed because the pack is too small for the load. And likely not very healthy so will have high volt drop under load. The cell log will plug into the 9 wires that go to each cell.

Also, you can now REDUCE the termination current, in your preset by 30 to 35%. Cant remember what I set it to, but it was a "safe" figure. Charge is ending very soon. Its not essential.

Also, from experience, looking at that graph, your pack is now about 38 to 40Ah. If it was 50Ah or more before, its probably not now...
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Re: Removing BMS & wiring in Pl8v2

Postby grazy+1949 » 10 Feb 2019, 19:02

Thanks for the valuable analysts BM. I'll take on board all you have said and make the adjustments. I will order a cell monitor from DigiKey.com, unless you have a better supplier in mind? Yes the pack @ 35-40Ah is tiny for what I do. I will when I can afford it increase the pack by a factor of x 6, probably going to 48v at the same time. Thanks to BM, Woodygb, elryko1992 my programmers: Tom and Tony and all the other people who helped me get my LiFe pack linked up to a Revolectrix Cellpro PL8v2, with balance leads and a fully professional set of presets. This is an amazing forum. :worship

cheers

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Re: Removing BMS & wiring in Pl8v2

Postby Burgerman » 11 Feb 2019, 11:23

probably going to 48v at the same time.


There will be trouble ahead... Song. :clap
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Re: Removing BMS & wiring in Pl8v2

Postby grazy+1949 » 15 Feb 2019, 14:46

My EV ATV Mobility Rover is now BNS-less and being charged by a Cellpro PL8v2 running on Burgermans presets. The difference in the amount of charge that the pack now accepts is really noticeable. I did a photo shoot a few days ago on a motorcycle enduro circuit . It went well . The Rover did all the climbs and tricky descents really well. I was in agony after this long drawN out shoot and had to lay on ice packs from 6pm untill 2am So the following picks came at a high cost

I sent the charging graphs to BM , who says that I have about 40Ah. I am amazed what this vehicle can do with just 24v 40Ah (reduction factor = 25:1), but I of course know that by using the pack under such severe conditions , it will not last long. I am taking BM's advice and will be ordering a cell monitor soon to ensure that my cells NEVER drop below 2.5v under load. Also I am planning to buy a much larger pack +BLDC motors soon.

My pack comprises 64 X Weter 26.6 X 65 mm cells. It's a golf buggy pack and they have the brand name Weter on them , but carry no other markings. I am not sure what the original Ah of the pack was, although BM puts it at 50+ Ah from studying the PL graphs. It would be nice to know the output of these cells.

cheers

grazy+1949
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Re: Removing BMS & wiring in Pl8v2

Postby grazy+1949 » 15 Feb 2019, 14:54

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Re: Removing BMS & wiring in Pl8v2

Postby expresso » 15 Feb 2019, 16:53

nice looks like fun -
Quickie P222se - 60Ah ADD ON
Quickie S646se - 150Ah LifePo4
Quickie P220 - Indoor Chair
Bounder Plus - 180Ah LifePo4
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Re: Removing BMS & wiring in Pl8v2

Postby grazy+1949 » 16 Feb 2019, 01:10

High Guys

As I use my EV ATV Mobility Rover under extreme conditions Burgerman has suggested that I should fit an 8S cell voltage log. This device can be plugged into the D-Sub connector on the pack. If at any time a cell drops to 2.5v, it will sound an alarm. I will know and stop immediately to avoid damaging that cell .
This is what I have found. Is it suitable for real time cell voltage feed back? It doesn't look like it plugs into the 7 balance leads that go to the PL8 ?

https://www.rcmodelscout.com/Batteries- ... Lipo/41057

cheers

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Re: Removing BMS & wiring in Pl8v2

Postby Burgerman » 16 Feb 2019, 02:20

9 WIRES...
Yes it does. Be sure it can be switched to the correct chemistry.
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Re: Removing BMS & wiring in Pl8v2

Postby grazy+1949 » 16 Feb 2019, 17:26

Hi Guys

I need one of these . Does anyone know where to buy it?
cheers
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Re: Removing BMS & wiring in Pl8v2

Postby danpayton » Today, 05:12

its not the most well-built thing in the world.. but i got it from amazon..lol. here ya go!
https://www.amazon.com/dp/B01MZIAJI0/re ... ACbQDA22D6
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Re: Removing BMS & wiring in Pl8v2

Postby Burgerman » Today, 09:49

As a warning, that device doesent measure each cell. So you wont find it much help on that too small 50Ah pack. You will find that one cell group will go too low long before the others. So you may have an OK total voltage while nuking one cell group...

So this one above download/file.php?id=10286&mode=view is much better.
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