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Battery eliminating circuit - 12/6/2012 3:35 AM   
acerc



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From: lithia, FL, USA
Status: online 		I figure this is a good place to ask this question. I want to go from two NiMh batteries to one LiFe. Would a 5v output bec placed between the battery and the ignition be the right way to go? Don't want to fry the ignition's.


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RE: Battery eliminating circuit - 12/6/2012 5:34 AM   
nitro wing


 

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Status: offline 		what motor and ignition?

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RE: Battery eliminating circuit - 12/6/2012 11:03 AM   
Tony Hallo


 

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Status: offline 		I am currently using a Hobby King 5 amp BEC on my receiver battery for ignition power.  The only draw back is it must be unplugged after the end of the day, it draws about 100ma with the ignition off.  Call me crazy but it works.  Two years ago I would never considered this.  Here's my current setup;
Two Troy Built  2600 ma li-poly batteries
Smart Fly Regulator set at 5.9 volt
Hobby King 5V BEC ignition regulator plugged into one of flight pack charge plugs
D&B 5.1 twin engine - Has resistor sprark plug wires, not shielded
FrSky 2.4 receiver 8 channel
Smart Fly Ignition cutoff
Homemade power distribution board with 4.7 mf capacitor filter
7 Hitec 7555 servos

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RE: Battery eliminating circuit - 12/6/2012 12:59 PM   
karolh


 

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Status: offline 		How long have you been using your FrSky 2.4 system. Is it the telemetry capable version and how do you rate it's performance.

Karol

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RE: Battery eliminating circuit - 12/6/2012 3:17 PM   
BarracudaHockey



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Status: offline 		Get a dual output A123 and run a diode drop down on the lead to the ignition.

No need for an IBEC.

wrongwayrc.com sells what you need.

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RE: Battery eliminating circuit - 12/6/2012 3:29 PM   
acerc



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Status: online 		The LiFe I bought has dual output's. Would be glad to do the diode, had one berore for something else, but don't know what size diode to go.


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RE: Battery eliminating circuit - 12/6/2012 4:46 PM   
Tony Hallo


 

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quote:

ORIGINAL: karolh

How long have you been using your FrSky 2.4 system. Is it the telemetry capable version and how do you rate it's performance.

Karol

Two seasons, two planes, does have telemerty, no problems to report, good range, no resets or brown outs, no failures.  How else might one rate the system?  It is cheap and works.  I have the module installed in a Futaba 9C, considering upgrading the telemetry.

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RE: Battery eliminating circuit - 12/6/2012 6:06 PM   
BarracudaHockey



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quote:

ORIGINAL: acerc

The LiFe I bought has dual output's. Would be glad to do the diode, had one berore for something else, but don't know what size diode to go.

Not sure on the specs of the diode though I'm sure with some searching you could find it.

I use these, last on the page.

http://www.shop.kavarootusa.com/category.sc?categoryId=10

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RE: Battery eliminating circuit - 12/6/2012 8:09 PM   
acerc



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Status: online 		Thank's Andy. In my search on this thing I have talked to several people as well as posted question's. Just got done talking with a local fella that deals with large scale. He recommended I go with a Tech-Aero Ultra. It not only regulates the current but also fuctions as a kill switch. Two birds with one stone. Not that I'm a big fan of Tx kill switches but, WTH, choke switch or kill switch either way I'm flipping a switch.
Well see!


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RE: Battery eliminating circuit - 12/6/2012 8:47 PM   
acerc



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Status: online 		In regards to the A123's the US manufacturer, A123 Systems,  is no longer selling them. According to their website.


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RE: Battery eliminating circuit - 12/6/2012 9:04 PM   
BarracudaHockey



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Status: offline 		They are no longer selling packs to end users. They are supplying cells in bulk to places like Wrongway, Tail Dragger, and others that sell A123 packs.

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RE: Battery eliminating circuit - 12/6/2012 9:23 PM   
acerc



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Status: online 		Did a little more research and it's only the US that is no longer producing. They have four other plants, Germany, Korea, and 2 in China


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RE: Battery eliminating circuit - 12/6/2012 9:57 PM   
abelard


 

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Status: offline 		According to this, the US affiliate is bankrupt and up for sale:

http://www.xconomy.com/boston/2012/12/06/a123-goes-on-the-auction-block-heres-how-it-got-this-bad/?single_page=true

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RE: Battery eliminating circuit - 12/6/2012 9:58 PM   
eddieC



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Status: offline 		Johnson Controls bought A123's US operations. They'll be around for a while.

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RE: Battery eliminating circuit - 12/6/2012 10:19 PM   
acerc



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Status: online 		Just got an E-mail back from Wrongway. According to them, Richard,  they have plenty for now. He also said he does not know how their, A123 System,  bankrupcy will effect them


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RE: Battery eliminating circuit - 12/6/2012 11:14 PM   
BarracudaHockey



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Status: offline 		As was said, the production of the consumer use cells (tools, us, military etc) have been and appear to continue to be unaffected.

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RE: Battery eliminating circuit - 12/7/2012 1:42 AM   
MTK



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quote:

ORIGINAL: acerc

Thank's Andy. In my search on this thing I have talked to several people as well as posted question's. Just got done talking with a local fella that deals with large scale. He recommended I go with a Tech-Aero Ultra. It not only regulates the current but also fuctions as a kill switch. Two birds with one stone. Not that I'm a big fan of Tx kill switches but, WTH, choke switch or kill switch either way I'm flipping a switch.
Well see!

The Tech Aero unit is the only one I would consider. It has several important features; the most important ones are invisible dealing with signal filtering. RFI just doesn't get past the filters. As a safety remote arming switch (I use my retract switch on the TX) it serves just fine. With its built in V reg you may have 6 1/2 or 7 volts in but you set the output to 5 V to the CDI...Plus, at 40$ it's inexpensive


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RE: Battery eliminating circuit - 12/7/2012 2:12 AM   
Truckracer


 

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Status: offline 		Ace, like you I never cared much for the ignition cut-off circuits. Recently though, I decided to try the Tech-Aero IBEC. So far it works great and I certainly like the idea of one less battery. I might be a convert!

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RE: Battery eliminating circuit - 12/7/2012 2:23 AM   
acerc



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Status: online 		Happy to hear Truckracer. I have never been a fan of electronic cut-offs either. But?
Andy I'm just repeating what was told to me, don't know anything anything for sure.  Either way there are A123's available. I have already purchased the LiFe battery anyway and ordered the Techaero IBEC.


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RE: Battery eliminating circuit - 12/7/2012 6:19 AM   
drac1


 

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Status: offline 		The Tech Aero IBEC is the best option. I've been using them on my YS cdi's and 100cc gassers with no problems what soever.

< Message edited by drac1 -- 12/7/2012 1:30 PM >

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RE: Battery eliminating circuit - 12/7/2012 1:18 PM   
ahicks


 

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Status: offline 		I use 2 leads from the single A123 battery pack as well. Those lead to 2 switches. From there, one goes to the receiver, the second to a Y in the rudder line. The second lead that goes to the Y will supply the largest servo (or the one that's likely stressed the most), and demanding the most power. That power is also capable of backing up through the receiver to help out anywhere else it's needed - and is also capable of supplying the entire system in case of a switch failure on the other line? This gives a lot of the redundancy a dual battery pack setup may give you.

There's nothing wrong with the Ultra IBEC, but the Rcexl opti switch with a diode can do the same thing for about half of what those cost. Commonly available for 20.00 or less. There are a TON of them in use. One source would be Wrongway, he's a distributor for Rcexl, and that's what he gets for them. VV has them as well....

The diode is placed in the output leg of the switch (leading to the ign. module). The diode you're after is 1N4007, available in 5 packs from Radio Shack for about 5.00. The only thing that makes that diode special is that they're easy to find, they'll drop the voltage enough for our purposes, and they can handle any load placed on them by the ign. module. Wrongway also has these available in a short extension all wrapped up pretty and ready to go at a pretty reasonably price as well.

Nothing wrong with the other sources listed, but additionally, A123 cells are available from a guy here in the Midwest to allow you to build your own packs. Good guy, easy to talk with, fair prices. -Al

http://www.voltmanbatteries.com/servlet/the-LITHIUM-dsh-ION-CELLS/Categories

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