Help Selecting/Finding Battery Pack for Paramotor

All very good points made. I have attached a couple pictures. Don't really need a diagram to explain the harness. Basically there are 4 x 4mm plugs and all 8 wires go to the controller so I would say they are wired in Parallel.

Not very concerned with the batteries to malfunction other than fire. I mean it is a paraglider keeping me up so its not like I will fall from the sky like a rock. A motor out is more an inconvenience than anything but there are a few places and times it can be bad. So I will manage that risk by avoiding those while flying this particular paramotor. I definitely cant afford the high end lipo batteries. If I was going to spend that much I would just have a 18650 pack with BMS custom made for me and it will last much longer than the lipos.

Fire is defiantly one of the top risks when it comes to these batteries. So to help lower that risk I will build a metal box to contain said fire till I can land safely.



 
No option is going to be cheap, because you need a high C rate pack to give the 220 A discharge.
Cheap lipo will sag and die quick if you try using it.
Maybe HK 65C Nanotech would be a reasonable compromise ? ..at half the cost of the Hacker packs.
But be sure to cycle and test well before trusting it in the air.
A 14s, 4p, set of (8x 7s packs) , would be a fairly easy install...if the connectors match ?
 
I bet you could find a Samsung 25r pack 14s 10p 52v 25ah bms pack in Europe for 1,000usd. Maybe with charger. Plug and play. Ez pee zee. 500-700 cycles.
How much for lipo and charger and soldering iron plus wire and bullets ect . Hobby. Flying hobby or battery hobby ?
 
I bet you could find a Samsung 25r pack 14s 10p 52v 25ah bms pack in Europe for 1,000usd. Maybe with charger. Plug and play. Ez pee zee. 500-700 cycles.
How much for lipo and charger and soldering iron plus wire and bullets ect . Hobby. Flying hobby or battery hobby ?
Click to expand...

Where? I would buy it right now if I could find one for that price. Don't tease me. Most definitely not a battery hobby. No offense. I actually have dreams/nightmares about batteries the other night.
 
South Dakota USA ? Luna cycle contact ? Brain and tell him your needs. Maybe a better cell then samsung 25r or 30ah for your esc demands.
 
Charger etc will be similar which ever cells you use.
I don't know how important motor performance is on a paraglider, but for an equivalent sized pack, (20 Ahr ?) , those 18650s will sag much more than high C rate lipos....as much as 8 or more volts at max discharge...which would mean over 1000 rpm less prop speed !.
18650s are excellent cells and ideal for many applications, however I do not believe they are the optimum choice for this specific use where high discharge rates ( and low weight), are a primary requirement.
 
If you’re set on 14S RC Lipo you could do 2qty 4S (8S) and 1qty 6S in series multiplied x 4. I would avoid oddball RC Lipo cell count combinations though. 7S, etc. I prefer to stick with high volume RC Lipo (6S, 4S) not something that might be left sitting on shelves for a long time.

It would appear your ESC main power cabling is already paralleled so that is taken care of for you.

I think I would just go with 12S using 6S bricks. 2qty in series multiplied x 4. You’d need to buy a total of 8qty 6S bricks. 4mm bullet connectors on Turnigy bricks will make your series connection easy enough. You lose a little RPM but the ease of purchase and assembly for 12S would be enough for me to punt the 14S idea.

20-30C Turnigy 5Ah bricks would probably be my choice. As you describe your lift isn’t dependent on power plant so I wouldn’t be too concerned with C rate like an RC 3D flyer.

Paralleled 4qty 20C 5Ah labelled bricks should provide 400A. We all know C rates are inflated but 200A from 12S4P using 20C 5Ah bricks isn’t out of the question.

And a good supply of cell alarm monitors for each brick too. You can bulk charge in a place you might build a fire using a 50V power supply or voltage adjustable charger.
 
16 A123 20 ah lifepo4 3.3volt 20c pouches. Only put out 19ah or ? Cycle life 1,200. They are the real deal as fire safe as things get. I have 735 cycles on 80v only 40amp draw on pack. You will need 16s
Plus with 18650 you might need 40ah to match that controller ?
 
Ykick said:
?..
I think I would just go with 12S using 6S bricks. 2qty in series multiplied x 4. You’d need to buy a total of 8qty 6S bricks. 4mm bullet connectors on Turnigy bricks will make your series connection easy enough. You lose a little RPM but the ease of purchase and assembly for 12S would be enough for me to punt the 14S idea.
.......
20-30C Turnigy 5Ah bricks would probably be my choice. As you describe your lift isn’t dependent on power plant so I wouldn’t be too concerned with C rate like an RC 3D flyer.
.....
Click to expand...
:?: Hmm? .. I wonder why they put a 15kW motor and Controller on that rig ?...waste of power not to use it.
Also , there is no difference in assembly or connection between using 2x 6s and 2x 7s packs
Why the concern over a 7s cell count pack anyway ?? That's irrational !
The difference between a 12s standard 30c Turnigy pack , and a 14s , 65c , Nanotech pack is around 1500 rpm and a 5 kW power drop !
I have newer tried a paraglider, but I get the impression the difference between 10kW and 15kW , and an extra 1500rpm from the prop, might just make a difference at take off ?
Sure, they will cost you more, but there are some things it's better not to save money on.!
 
Hey thanks guys. I really do appreciate all the great info. Below is a youtube video depicting exactly what I am going for. Maybe a little longer flight times. below that is a link to all the parts he used to build this. As you can see his motor a smaller than mine and he is only running a 44.4V 24ah battery pack. Has no issues getting in the air and he looks about my size if not slightly bigger build. The bigger motor and more power will definilty make some aspects easier but are not necessary.

I think I am going to try the 12s high C lipo idea. What I actually buy depends on what's in stock. A lot of the packs I was looking at were not in stock or they only had one or two available. But in the mean time I will also be looking for someone to build my 16s Lifepo4 battery pack with BMS. Doesn't look like anyone is too terribly interested on purchasing the cells from me so instead of giving them away I might as well put them to good use. If you know anyone please send them my way. I would obviously pay them for their time shipping costs and any additional items needed. Already have all the cells and the BMS.

https://www.youtube.com/watch?v=KeyAyiL8OCM

http://laserhacker.com/?p=53
 
:shock: ...so you already have the 16, A123, 20ahr , pouches ?? :roll:
Why didn't you make that clear? It would have saved a lot of posts.
Just find someone to assemble them for you, or search this forum for any one of a dozen ways to DIY.
Have a look at this thread to start..
https://endless-sphere.com/forums/viewtopic.php?f=14&t=69856
 
I thought I did in my initial post but I went back and read it and I guess I didn't. So very sorry. Still does not take away from the fact I have no ambition to build this pack myself not to mention tools or knowledge. So the plan was to sell the cells to fund a different battery. I have them listed on here for sale but very little interest and some said I was asking to much so I guess I over paid. so I will keep them and have a battery pack made rather than give them away.

I still learned a lot and go a lot of different opinions. Your posts were not in vain.

http://www.hobbyking.com/hobbyking/...000mAh_6S_25_50C_Lipo_Pack_AR_Warehouse_.html

How do those look? 6 of these in a 2S3P configuration (I think that's right) 44.4v 24ah
 
Based on personal experience buying/using well over 100 bricks/packs RC Lipo and reading years of posts from people who’ve bought and suffered with weird size/type “RC Lipo” I’m a firm believer in sticking to product which is more likely produced and sold in significant numbers. Fresh RC Lipo is best.

http://www.hobbyking.com/hobbyking/store/__59056__Turnigy_5000mAh_6S_20C_Lipo_Pack_AR_Warehouse_.html

http://www.hobbyking.com/hobbyking/store/__59001__Turnigy_5000mAh_6S_25C_Lipo_Pack_AR_Warehouse_.html

http://www.hobbyking.com/hobbyking/store/__58998__Turnigy_5000mAh_6S_30C_Lipo_Pack_AR_Warehouse_.html

FYI - don’t count the “bricks/packs” when expressing series numbers like you did with 2S3P - very confusing. 2qty 6S bricks connected in series would be 12S1P. For the pack you’re describing using those 8Ah bricks, that would be expressed 12S3P.

I suggest you go 12S4P using one of the 5Ah Turnigy 6S versions I linked above. Your input wiring will support that and get you to 20Ah for way less money than 12S3P of that “weird” NanoTech 8Ah stuff.

I predict fewer problems and for the money saved you can and probably should buy an extra brick or two. Because with that large number of RC Lipo bricks there will likely be problems and perhaps a duff cell or two.

Good luck
 
Where and when did anyone I have A123 cells. What kind of pouches ? Short tab or solder tab or brand new full tab. A or B grade. Where did they come from ?
 
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