Parallel (redundant) RX setup??

[djmarch]

Please advise on setting up a redundant system.
My knowledge on this is limited (based on many years ago,now returning to hobby).

I do understand if using NIMH or even A123's you use same voltage batteries, in this case 6 volt. for a 2.4 Futaba system.

- each has their own switch/charge jack
- they are charged independently/cycled if NIMH/Cadmium independently
- each pack has it's own connection to the Rx (uses available Rx servo
connection for second pack (correct ??)
- this increases capacity and kicks in if system failure on one system

Now this is what I don't understand and is holding me up.

- doesn't this put 12 volts into the Rx ?? cook the Rx !
- when does the second pack come into action?
- Is there a primary and a slave pack when do they come into or out of
action (use)?
- Are they both in use but voltage split to 3 volts each??

I have a general understanding of this but do not understand the where,
when and how voltage comes into play in actual conditions or if there are any cautions to observe.
If you have any additional information it would be appreciated.

Please advise and thanks in advance

[classclown]

dj, plugging two batteries into empty rx ports will be a parallel setup, do not worry. It will be just like hooking up both positive ends, and both negative ends respectivly, and then plugging them into the rx. Same voltage, double the capacity. But it is better to plug them individually into separate ports, as the 22 guage wires, and the rx plugs can only handle 3 amps max. What you were worried about, when you connect a positive wire of one battery, into the negative of the second battery, now the free positive end , and the free negative end, will put out double the voltage, but only at the normal capacity of the batteries chosen. Example, 2 batteries at 3000ma in series, would still be 3000ma, double the voltage. Hope this helps. Steve

[djmarch]

thanks classsclown. I now have an understanding of this.
Will be using parallel system immediately.

[crazyjoe]

I borrowed this diagram from an FG member. Follow this carefully.

[3D-Seth]

Both batteries are in use all time, just if one fails, juice is then entirely pulled from the other so you can continue flying and get it back on the ground in 1 piece. Just as classclown said, its still only 6V into the system, not 12.

Hope this helps.

[Bunky F. Knuckle]

If you are running 1 Rx, and use 2 batteries......

Plug 1 batttery into the BATT plug, and the other into any open port in the Rx. The batteries will be in PARALLEL. Batt voltage will be the same, as batt capicity doubles. You are just running on the same power buss in the Rx. All my GS airframes that ran 1 Rx has 2 batteries on the Rx. And to make sure that things are working, I would turn 1 side on, check it, and then turn the other side on, turn side 1 off, and check again. Once I know both are working, I turn the other battery on, and go fly!!!!

[nate428]

there are products on the market to take it one step further. these devices usually give the added function of even battery draw, so that both discharge the same amount. and some have battery protection, so if a battery tries to short out or overload the system it will be turned off, protecting the rx, and the other battery will continue to power the system.

42% products $18 and smart-fly $30 make some.
http://www.troybuiltmodels.com/items/42BATTSHAREJR.html
http://www.troybuiltmodels.com/items/QBS.html

With the Smart-Fly BatShare, you can tolerate a single failure (open-circuit, short-circuit, low voltage) in either battery pack, or switch, or battery wiring, without losing radio control. The Smart-Fly BatShare continually monitors both battery packs and switches for the one with the higher voltage, and routes that to your Rx and servos. You may combine different size packs.

OR you can get a batshare+switch in one!
http://www.troybuiltmodels.com/items...WOLVERINE.html

[Flyin Blind]

This was the exact post I needed. My first 50cc and had dual battery questions. BatShare and double switches or a Wolverine switch. Just to make sure, I could use a AR7000 RX, one input into the BAT port, and the second in say, the GEAR port, correct?
Thanks guys.

[littlecrankshaft]

	Quote: Originally Posted by crazyjoe
	I borrowed this diagram from an FG member. Follow this carefully.

where did you get a pic of my airplane?