Turnigy Multistar - lightweight 10C cells

Batteries, Chargers, and Battery Management Systems.
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Chalo   100 GW

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Re: Turnigy Multistar - lightweight 10C cells

Post by Chalo » Aug 23 2017 2:30am

rainmaking wrote:I'm also not sure being in saltwater with a bunch of cells discharging would be deadly.
Why not give it a go? You might be right after all.

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Sunder   100 MW

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Re: Turnigy Multistar - lightweight 10C cells

Post by Sunder » Aug 23 2017 3:32am

I'm curious what happens when you get 96 of these, maybe 100x the size in salt water:



Would enough H2 and O2 or even H+ and OH- be created to be an issue?
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ElectricGod   100 MW

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Re: Turnigy Multistar - lightweight 10C cells

Post by ElectricGod » Aug 23 2017 11:13am

rainmaking wrote:Oh, and I would think grounded plumbing has something to do with hair dryer electrocutions.
I don't think grounding the plumbing would really matter. It's already a lower voltage potential than the wall outlet. That's all you need to have current flow.

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ElectricGod   100 MW

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Re: Turnigy Multistar - lightweight 10C cells

Post by ElectricGod » Aug 23 2017 11:25am

Chalo wrote:
rainmaking wrote:I'm also not sure being in saltwater with a bunch of cells discharging would be deadly.
Why not give it a go? You might be right after all.
I'm with you...I believe so it must be OK...NOT!

I hope he builds it. Worst case, he wins the Darwin award for the most expensive way to electrocute yourself in water.

Edit...changing 800 volts to 400 volts...because that's so much safer in the water.

ummm...yeah lets put a blow drier that runs on 400 volts and 200 amps in the bathtub and see if it will electrocute me or not. The 120 volt 6 amp version didn't quite make me dead enough so lets go just a smidge stronger! LOL!

I'm not against making an electric jet ski. I think it's a brilliant idea! Just be very wary of the massive amount of electrons you have between your very wet legs!

Perhaps a video on electrocution and the reduced resistance of salt water vs fresh water will help. I have a 40 gallon aquarium that's not being used. I have battery packs that are 16s and 20S. How hard would it be to buy a 29 cent gold fish and fry the little bugger with far less voltage than you are proposing.

BTW...electric eels are not real...they don't ever electrocute anything in the water. So yeah...your battery pack is going to be A-OK in the water!
Last edited by ElectricGod on Aug 23 2017 11:41am, edited 1 time in total.

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Re: Turnigy Multistar - lightweight 10C cells

Post by ElectricGod » Aug 23 2017 11:33am

Sunder wrote:
ElectricGod wrote: Is 240 volts AC rectified 400 volts DC? I don't honestly know...
Huh. 240vac RMS rectified is 336vdc. 220v stepped down is 308v

I was wondering why my Outlander had a 300v pack. Would be very efficient to step down (if it's stepped down at all).
Since Tesla charges at 400+ volts, that wall unit must have some kind of heavy duty switching power supply inside to get the 336 volts to 405 volts.

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Re: Turnigy Multistar - lightweight 10C cells

Post by Hillhater » Aug 23 2017 9:33pm

You could simplify things , and make them much safer, if you dropped back to a 60-80v system, with something like a water cooled GM motor, or modified Zero motor, with rpms that suit your pump better.
Lipo packs can be reconfigured easily to suit and retain the same discharge current.
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rainmaking   1 mW

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Re: Turnigy Multistar - lightweight 10C cells

Post by rainmaking » Aug 24 2017 9:57am

Hillhater wrote:You could simplify things , and make them much safer, if you dropped back to a 60-80v system, with something like a water cooled GM motor, or modified Zero motor, with rpms that suit your pump better.
Lipo packs can be reconfigured easily to suit and retain the same discharge current.
Image
Unfortunately not really. That motor has probably usable ratings (20kW/5000rpm), albeit about half the one I'm using, but it weighs over twice as much at 39kg and I would still need to do something to offset the shaft. I have about 95mm between my pump shaft CL and the inside bottom of my hull. Direct drive would be nice but I can't find a motor even close to the specs I need that can be directly coupled, weight being the main issue. I would prefer a smaller high rpm motor that I could use a planetary on; that would improve my power density further, but can't seem to find that either.

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Re: Turnigy Multistar - lightweight 10C cells

Post by Hillhater » Aug 24 2017 8:39pm

I was not suggesting that it was the ideal solution, just a suggestion as tho the low voltage options.
Dont forget, a gearbox, especially planetary, capable of 30-40kW , is not going to be a featherweight !
Shaft offset could be easily accomodated with a simple powerbelt transfer.
PS.. That motor also has a 50kW / 30 sec rating.
If you want light weight, (and can afford it) there is always Emrax
http://emrax.com/products/emrax-188/
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Re: Turnigy Multistar - lightweight 10C cells

Post by Quinc » Feb 06 2018 3:08pm

Anyone try running the multistars above 5c? I want to run my gokart with 24aH 12s configuration at 50-150a continues and peak of 250-300a. Wondering if I am going to smoke these batteries and need to go with 30+aH.

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Re: Turnigy Multistar - lightweight 10C cells

Post by motomech » Feb 06 2018 10:03pm

I've been using Multistar since they came out, but don 't have any experience w/ big packs and high discharge rates, so I couldn't say of they will "smoke" or not, but don't expect much "punch" like you would get w/a "stiffer" battery pack.
A member here, icecube57 did some testing on MultiStar discharge rates and although he didn't etch anything in stone, I took away that 40 Amps continious would be about the most one should try and get out of a typical 15Ah to 25 Ah ebike pack.
On my 2WD, the frt. motor is powered by a small 12S/5Ah pack that I swap back and forth between MultiStars and Turnigy 25C and I can really feel the difference. As the Multistar gets to about 50% discharged, I see sag of 1 to 2 Volts. W/ the Turnigy, I don't see any sag until they are almost done.
My sense is, you are asking too much of the Multistar.
Motomech

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Re: Turnigy Multistar - lightweight 10C cells

Post by Ianhill » Feb 08 2018 1:03am

After a bit of plodding around on my scooter to warm it up I was getting 58amp bursts from a 16ah multistar with nominal voltage drop but I wouldn't go no further and in winter no chance 20amps is to much.

Jonno   10 W

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Re: Turnigy Multistar - lightweight 10C cells

Post by Jonno » Feb 08 2018 5:01am

Hi Guys,

I have 24 (24s 4p) of these in my bike, they work well as long as you keep them all balanced and will push out 200a I've done 2500 miles with no problems into a 200a APT controller
FOI i bought an extra 11 packs last month as they were on offer @ £19.90 each

Jonno
EEB frame, 888 forks, QS273 V3 , Nucular Electronics 24F controller, 84V @ 36ah 26650 cells, Vortecks 200a BMS, Hope 203mm + Regen brakes......Let see how quick this mk7 goes

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Re: Turnigy Multistar - lightweight 10C cells

Post by DAND214 » Feb 08 2018 12:08pm

Jonno wrote:
Feb 08 2018 5:01am
Hi Guys,

I have 24 (24s 4p) of these in my bike, they work well as long as you keep them all balanced and will push out 200a I've done 2500 miles with no problems into a 200a APT controller
FOI i bought an extra 11 packs last month as they were on offer @ £19.90 each

Jonno
Which packs are you using? Seems like a lot of drain for a small pack.

Dan

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Re: Turnigy Multistar - lightweight 10C cells

Post by Jonno » Feb 09 2018 2:03am

Hi Dan

4 cell 5200mah multistar -used on my sabvoton 72150, sabvoton 72200 and now a APT ae96600. They work fine and recover well, gets to 50mph in a burst don't know top speed cos it's scary ........ problem is the front wheel has an inability to stay on the ground and the back wheel spins at the same time as it tries to split me off (with some success I might add)...........bicycle is a loose term in my case :lol:



Jonno
EEB frame, 888 forks, QS273 V3 , Nucular Electronics 24F controller, 84V @ 36ah 26650 cells, Vortecks 200a BMS, Hope 203mm + Regen brakes......Let see how quick this mk7 goes

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Re: Turnigy Multistar - lightweight 10C cells

Post by Jonno » Feb 14 2018 12:14pm

Hmmmm.....you'e right there Dan, I may need a few more packs putting in parallel as the voltage sags somewhat after 50mph.

I'll see if I can get 12 more packs to fit giving 24s 6p or 100v @ 31.2ah

Jonno
EEB frame, 888 forks, QS273 V3 , Nucular Electronics 24F controller, 84V @ 36ah 26650 cells, Vortecks 200a BMS, Hope 203mm + Regen brakes......Let see how quick this mk7 goes

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