Turnigy LiFEPO4 packs - Page 14 - RC-Monster Forums

sikeston34m · 12.16.2009, 07:10 PM

Quote:

Originally Posted by simplechamp

Got my pair of Turnigy LiFe packs today (2S 4500mah). Pack 1 had cell voltages of 3.364V and 3.364V, pack 2 had 3.364V and 3.362V. Of course in my infinite wisdom I forgot that I don't have any more Dean's connectors laying around, so I won't be able to test the cells for a few more days.

I'll be running them in my TC with a Castle 4600kv and geared for about 35mph. The next thing on my list is to get an EagleTree and see how these packs hold out under a load.

Great!

Please keep us posted Simplechamp. I think you'll be pleased with the results.

I would love to see some Graphs for these packs.

Thomas · 12.16.2009, 07:30 PM

Lutach, can you tell me more about your idea? I have no idea what you mean.

I'm currently designing some parts to convert this car: http://www.amzracing.ch/amz/files/amz1064.jpg
Well, it's not really a conversion, we're building a new monocoque and everything. With LiPo of course. We can discuss it here: http://rc-monster.com/forum/showthread.php?t=17955

simplechamp · 12.16.2009, 07:37 PM

Quote:

Originally Posted by sikeston34m

I would love to see some Graphs for these packs.

No doubt. I have to see how I make it through the holidays money-wise, but an EagleTree is next on my list.

lutach · 12.16.2009, 07:47 PM

Quote:

Originally Posted by Thomas

Lutach, can you tell me more about your idea? I have no idea what you mean.

I'm currently designing some parts to convert this car: http://www.amzracing.ch/amz/files/amz1064.jpg
Well, it's not really a conversion, we're building a new monocoque and everything. With LiPo of course. We can discuss it here: http://rc-monster.com/forum/showthread.php?t=17955

I posted something in that thread. So this one can be on track again.

sikeston34m · 12.27.2009, 12:22 PM

I said I would love to see some graphs on these packs. Well since I acquired a Data Logger, here it is:

This run is 4S 4500mah Turnigy Lifepo4 in an E Revo with the following setup:

HVmaxx 4400 running a sintered rotor w/5mm shaft
gearing is 14/52 using Mod 1 gears
MM Pro

It will point the nose to the air almost at will and will flip over backwards with good traction.

Still better than the A123 cells.

Looks like about 2.75 volts per cell under a 108 amp load. Check this out.

othello · 12.27.2009, 05:01 PM

Glad to see that you are putting your datalogger to good use. I was eager to see some discharge graphs of those batteries.

I browsed through my logfiles and found a comparable one where i used 8s2p A123 cells. I zoomed into a 108A discharge peak.

. @108A voltage drops to 22.14V or 2.7675V per cell
. discharge state of my pack at this point: 1/3

There are many parameters influencing v drop: internal resistance of the battery pack of course which depends on cell temperature, cell count, solder job, discharge state and so on ...

Judging by this single discharge peak there shouldn't be that much of a performance difference between a 2p A123 setup and those turnigy packs.

You may want to browse through my eagletree file.

Maybe you could attach yours too.

sikeston34m · 12.27.2009, 05:13 PM

Wow! Thanks for the graph. The proof is in the pudding huh?

They are pretty much the same. My graph was fully charged but on a cold day. 35 degrees or so outside.

Yes, there are many variables that alter a packs performance. That's for sure.

You can see most of my graphs so far on Photobucket under sikeston34m

JERRY2KONE · 06:36 PM

Quote:

Originally Posted by BrianG

I'd like to do that with a SMART car since they're so small and light. Once I take out the engine, tranny, fuel tank, and other assorted crap, it would probably be light enough to either make a hole in the floor a la Flinstones, or slap a set of bike pedals on it.

Thats already been done Brian. In Britain they already have an all electric version, which came out like three years ago. It was never done in the rest of Europe for one reason or another, probably due to the battery technology at that time. I think the range on it was only like 70-100 miles, but it was still a great vehicle for running about town and such. Personally I like the idea.

I have been out of ths states for a few years now. How is the smart car doing in the USA? Sales, specs, opinions, milage? ETC...

suicideneil · 12.28.2009, 04:02 PM

Not entirely correct; we do have electric smart cars, but the majority are still petrol engined- got tiny little 0.8L engines and such (smartfor2 model). There are also things like the Geewizz that are horrid plastic electric shit boxes, but due to lack of infrastructure there are relatively few electric cars- no where to charge them (quickly).

JERRY2KONE · **What? -** 12.28.2009, 06:37 PM

Quote:

Originally Posted by suicideneil

Not entirely correct; we do have electric smart cars, but the majority are still petrol engined- got tiny little 0.8L engines and such (smartfor2 model). There are also things like the Geewizz that are horrid plastic electric shit boxes, but due to lack of infrastructure there are relatively few electric cars- no where to charge them (quickly).

So what part of my post was not entirely correct?

suicideneil · 12.28.2009, 09:25 PM

I think you cheated...

I swear it said we have only electric versions, than an all electric version...

Confess your treachery/ post editing, confess now!

JERRY2KONE · **Laughing. -** 12.29.2009, 02:22 AM

While reading your response I was laughing my rear off

. You crack me up Neil

. It did not say all Smart cars in Britain were electric

. I was merely making the point that there was already an electric smart car on the market, after BrianG mentioned wanting to convert a smart car from combustion engine to electric

. My edit really had nothing to do with the content of the post

. That's OK Neil I enjoyed getting you into a twist.

BrianG · 12.29.2009, 02:27 AM

Quote:

Originally Posted by JERRY2KONE

Thats already been done Brian. In Britain they already have an all electric version, which came out like three years ago. It was never done in the rest of Europe for one reason or another, probably due to the battery technology at that time. I think the range on it was only like 70-100 miles, but it was still a great vehicle for running about town and such. Personally I like the idea.

I have been out of ths states for a few years now. How is the smart car doing in the USA? Sales, specs, opinions, milage? ETC...

Really? Cool. Too bad I don't live in Britain. And anyway, it would be fun to do a conversion. Have no idea how they're doing for sales, etc. I have seen a few around, so they are selling. After seeing several on the road, I don't know how safe I'd feel in that tiny thing next to even small cars! Wow, they're small. The good news is that if they get stuck in the snow, you could probably pick it up and carry it out.

JERRY2KONE · **True that. -** 12.29.2009, 02:38 AM

Yea the electric version was only produced and sold in Britain by Mercedes from what I have read and seen. If Chrysler (who now owns the Smart car) would make an electric version I would surely have to own one. They really are quite peppy, and top out at around 90mph. Your correct lite as hell, and would not do very well in a good stiff wind on the freeway. Still they are great for puddering around town doing errands and such. I would probably do very little highway driving with one. I would think it would be much like owning a luxury golf cart, except that it would be steet leagal. The crash testing that has been done on them is quite impressive. The car itself is built around a very strong cockpit, which is allot safer than it looks. It even does better than some of the American vehicles it was compared to. The pricing is still a bit steep for what you get($14K), but considering the savings on annual gas cost I would say it is a very good trade off.

glassdoctor · 12.29.2009, 11:56 AM

90mph in a Smart car... you probably feel like Chuck Yeager in the X-1

scary.

and imagine how scary it would be in those things on an icy highway