Quantum Blast 850 modification & rebuild

[Burgerman]

Your controller already does that. It stops the chair just below 24V depending on make. But on many its adjustable. But you still dont know is one cell group has gone low first. As they usually do. The real answer is to fit enough AH so its never a concern.

[hotwheels_75]

Good to know I’m not alone at least. Lol it’s frustrating, but I won’t make that mistake again.... I hope!


The controller doesn’t do that if the chair is parked though does it? What I’m thinking is different. I bought a dash cam for my van and I also got a direct wiring kit that lets you run constant power from the fuse panel. The cam has parking mode, records when parked at very low frame rate, if it gets hit or bumped it starts recording full rate. So it runs 24/7. It has an inline module that monitors battery power and if it gets too low it cuts power to the cam.

[Burgerman]

Yes but the chair when OFF is not supposed to be taking more than around 6 to 8mA. So would take an age to discharge it down low. And the battery itself has internal self discharge too. So you must top up every 3 to 6 months at least, then discharge by say 30 to 50% for storage.

[hotwheels_75]

Good points. I definitely won’t be leaving it sit idle and plugged in again anyway. My chair seemed to draw more than it should when off but plugged in. I can’t recall exactly how much now, but I’m sure it was something like .25A. We isolated it to the seat controller which looks ancient. The entire chair is nearly 20 years old. I want to do some upgrades to it. See if I can make it more efficient and functional.

[Burgerman]

If its really taking a quarter of an amp, then it will be 6 watts of heat wasted all day long!

Thats a 96Ah battery. So divide by .25A means about 384 hours till dead from full.

Thats 16 days to zero! Or 6Ah thrown away per day.

[expresso]

i just recharged up my 150ah pack it sat unused for 2 months - - and the graphs were pretty much perfect - 105ah pack was nice - the 45ah wasnt as perfect - this is after 2 months of not using it - i got a bit worried also and figure let me charge it up and see - i guess this is not wasting alot if left alone. 646 chair

[Burgerman]

Remember that you should store these packs between 1/2 and 2/3rds full for long periods.

[expresso]

i do a discharge after i charge it full - - for a few hours maybe - dont remember how long i left it on discharge - it may get used once or twice to move it around the place if i need but not outside at all unless i need too -

full pack 105ah graph is perfect i was expecting worse - its 3 years old now - 45ah pack not worried that graph gets better once i start using it daily etc, and its job for me is to keep my Full pack in shape extend its life and make it easy overall - i dont want to touch my full pack - thats the goal - let the ADD On take the hit as long as my full pack stays good.

also the 45ah started out as 30ah which i made the section on and just added 8 extra Cells this past summer - since the same space is there and no reason not to use all the same i had anyway - didnt change how it looked. get the most of out it .

[Burgerman]

Its surprising isnt it, how well these last. Esp when used to lead bricks for years, if actually used being well past their best after 9 months.

[expresso]

even if you gave me a new set of lead every week - wont work for me - i need the Range - on my outdoor chairs i need at least a 40 mile range and have left over to be home safely - so really 50 miles range and use 40 mile to 45 miles - lead cant do it for me - when i was using lead - i need new sets each summer - anything other than MK Gel - i used them in 2 weeks - drained them so low - they got me stuck and that was it - that was my tipping point and i decided that was it and it was time for me to move on - and jump on the lithium - i was ready and determined one way or another -

[hotwheels_75]

Yes the drain on my pack is definitely not good. I’m looking for replacement parts. I was hoping to be be able to swap different\newer electronics. I have an R-Net controller, I also have a seat control module. I need an R-Net joystick and programmer. Is it possible to swap everything? Replace the pilot + system for R-Net?


I recharged my pack, here’s the charge graph. It went slightly out of balance at the end right before balancing. Is that a problem?

[Burgerman]

With a 1A balance current on the PL8 its not going to be a problem.

With a BMS instead, balancing would take half a day or longer. Except it wouldn't actually happen as the charge would probably end sooner...

[expresso]

With a 1A balance current on the PL8 its not going to be a problem.

With a BMS instead, balancing would take half a day or longer. Except it wouldn't actually happen as the charge would probably end sooner...

yes thats true - thats why my chair with the BMS - it would need a few weeks of using it daily and recharging - but i may use the PL 8 to charge it before i start using it in the summer - at the moment i charge every few weeks or so to keep them balanced as best it can - i am sure they are not as balanced as my other chairs

[Burgerman]

If you top up every few weeks it should be OK. Its more the way it does so thats the problem. That and the fact that you are storing them full... You should top up, then remove about 1/3rd the charge.

Being full, or empty, or close to it is what they dont like.

[expresso]

that would mean i have to use the PL 8 to discharge some each time - maybe more of a pain to do that - or what i can do is just use the PL 8 now when i charge instead - then when i start using the chair daily in the summer - i can use there own charger instead - just moving that chair around in the apt. will discharge it enough to be fine it cant hurt to use the PL 8 now i guess or always but i have to get a feel of this chair once i start using it alot - i wonder if and when i use the PL 8 if they get all balanced at the end - since we use a lower charge voltage - really hard to know - since i dont know the details of the BMS being used - and its a state secret or they just dont know either - either way - i never know unless i rip it apart myself one day and look at whats inside and being used - i dont see myself doing that anytime soon -

[Burgerman]

I have a 40A discharge dummy load.
Plug in for 30 mins, 20Ah out.
60 mins, 40Ah out...

Doubles up as a room heater... When my room is cold I connect to a power supply. I added the PC fans so it doesn't get hot and burn my bench.

Upside down

Right way up.

[expresso]

https://www.ebay.com/itm/Divert-dump-lo ... 1774745028

i am debating this - but i dont discharge that much to make this useful - maybe i should have it for those times when i do - i just use the PL 8 and let it do its thing - a few hours or a few days sooner or later it gets done - maybe i try this - but i cant discharge with the XLR anyway that much - this would be useful when i make new packs - and current packs to check capacity -

[Burgerman]

https://www.ebay.com/itm/24V-40A-2000W- ... :rk:1:pf:0

Mines one of these. I added the fan. There were dozens on ebay at the time at 25 uk pounds. Not that silly price...

[shirley_hkg]

I
Doubles up as a room heater... When my room is cold I connect to a power supply.

I use what's handy . 4 bulbs will draw 8 amp, to light up and warm the room.

[Burgerman]

There are other ways.
I have a 1kw 24VDC to 240VAC inverter. I can plug this into my chair, again via Anderson, and plug in a 1kw domestic fan heater. Works exactly the same. Takes about 40 to 42A from the chair. You can use your clamp meter to see what the Amps are. Then just time it.

One of these for eg:
https://www.amazon.co.uk/Proglam-Invert ... ter+24v+dc

And a 500 to 1000w hairdryer (no use to me - no hair!) or a 1kw room heater...

[Burgerman]

In new York, espresso is realizing theres many ways. And I think he already has an inverter in case of power cuts. Plug a heater, or something greedy in, and you are set to go.

I use what's handy . 4 bulbs will draw 8 amp, to light up and warm the room.

That will work as well, but you need 20 bulbs in 2S 10P configuration to get 40A discharge.
Which is 1000w of light! Your room will look like a sci-fi time travel movie!

One other thing I do, is to connect a battery pack to my solar inverter input. It takes about 40A too, and it sends the electricity to the grid. And reduces my electricity bill.

[shirley_hkg]

One other thing I do, is to connect a battery pack to my solar inverter input. It takes about 40A too, and it sends the electricity to the grid. And reduces my electricity bill.

I like this most .

[Burgerman]

This sort of thing is exactly why I fit Anderson to everything...

You can do it too...

https://www.ebay.co.uk/itm/500W-600W-10 ... rk:10:pf:0

[expresso]

https://www.ebay.com/itm/24V-40A-2000W-hybrid-charge-controller-and-dump-load-set-1kW-solar-1kW-wind/323500466618?hash=item4b522161ba:g:9JoAAOSwXbFb5HBT:rk:1:pf:0

Mines one of these. I added the fan. There were dozens on ebay at the time at 25 uk pounds. Not that silly price...

thats the same cost as the one from ebay on this end more or less

i started a new section for this - to discuss discharging a large pack - i realize this was started to discuss the 850 rebuild etc, - we can continue there to discuss the discharging

viewtopic.php?f=2&t=8495

[Burgerman]

Except its only 600W and mine is 1k watts.

[hotwheels_75]

I got my new PSU, a 1200W from RevoElectrix. Happy to say I’m getting no more errors when charging or discharging. Can even discharge upto 3.75A as recommended. Also happy that my battery seems fine.

I used the chair out in the cold and a couple inches of snow, and never got stuck once. battery gave no indication of problems either. Only problem was thermal rollback cut in even in +5°C.

I recharged after that then did a full discharge down to 2.9v per cell. This time it registered 113k mah removed. Is that even possible? It’s a 96AH pack. 64 12AH cells 8s 8P.

[Burgerman]

Seems odd... 100would be about as much as you would expect.

[shirley_hkg]

Very odd.
3.75A x 10 hrs is 30Ah ish .

[Burgerman]

Save graphs and graphics as GIF files, or they get all fuzzy and unreadable?

But who knows what you are doing! Looks like a camera??

Just save a screen shot, by hitting "prt screen" and pasting as an image. Crop if you want, save as a .GIF.

[hotwheels_75]

I need to take power out of my pack to store for winter. It’s a 96AH battery. Should I do half or 2/3s?

And how often should I check it?