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2 Batteries to 1 reciever how?

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Old 01-14-2003, 04:55 AM
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Smokey
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Default 2 Batteries to 1 reciever how?

I was wondering how do you connect 2 batteries to one reciver? This is my first venture into giant scale. It will be going into a Lanier Edge 30%. The reciever will be a JR 5945 and the servos will be Hitec 5645mg. all over exept for throtle. Or is one battery really enough to do the job and what size.

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Froy
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Old 01-14-2003, 09:17 AM
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A.T.
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Default 2 Batteries to 1 reciever how?

refer to "Parallel Battery Operation = Reliability & More Flight Time
By Red Scholefield "
http://www.fly-giantrc.org/technical/parallelbatt.html
and other features on dual batteries and receivers under "Giant Scale" at http://homepages.ihug.co.nz/~atong/

regards
Alan T.
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Old 01-14-2003, 02:42 PM
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dsnyder
 
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Default 2 Batteries to 1 reciever how?

Yes, you sure can. I would recommend using a voltage regulator on each pack. The regulator would have a diode that would prevent back feeding from one pack to the other, and eliminates the possibility of one pack reversing a cell etc, from draining the other pack and losing power to the receiver. This will add some redundancy to your system.
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Old 01-14-2003, 11:30 PM
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Smokey
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Default 2 Batteries to 1 reciever how?

Thanks for the info. 2 batteries it is for me!
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Old 01-15-2003, 01:02 AM
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ml3456
 
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Default 2 Batteries to 1 reciever how?

Danny,

I would like to keep the advantage of 6 volts. Can I solder a diode in the positive lead of the battery to do the same thing? What size diode would you recommend if i do this?

Thanks

Mark
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Old 01-15-2003, 09:00 AM
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Mr T.
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Default 2 Batteries to 1 reciever how?

Yes you can, in fact that's exactly what I did. I used a dual shottky diode in TO-220 case MBR2545 if I remember correctly. If you can find MBR2515L it would be even better since it has extremely low forward voltage drop. You can expect that kind of diode to shave some 0.3 V off the battery voltage.

I suggest that you mount the diode to a small PCB, run battery + leads to diode outer pins, bend the center pin upwards and lay it flat on the plastic diode casing, you can even cut the center pin off if you decide to connect output + to the metal tab. I soldered the diode metal tab to the PCB and soldered output + lead to it, you can also connect it to the center pin, it is your choice. Batteries - leads are connected directly to output - lead, don't forget to put some heat shrink over this connection.
After all that you can apply some hot glue to secure the wires to the PCB, apply enough to cover everything but not too much (read heavy). Last step is to put the board into appropriately sized heat shrink.




Originally posted by ml3456
Danny,

I would like to keep the advantage of 6 volts. Can I solder a diode in the positive lead of the battery to do the same thing? What size diode would you recommend if i do this?

Thanks

Mark
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Old 01-18-2003, 11:51 AM
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Jimmy Bananas
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Default Smokey

You can buy a reduntant system from this outfit;
< www.electrodynam.com>

I have several and I have used them in a 4.8 v and 6.0v system

check it out...............
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