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View Full Version : rvosd2 work fine...but if i have a twin brusless model?


antonio.adi
05-28-2009, 09:32 AM
hi my question is...how i can assemble the rvosd2 if i have a twin engine brushless to have all the indication on my screen???
pit3k
05-28-2009, 10:34 AM
hi my question is...how i can assemble the rvosd2 if i have a twin engine brushless to have all the indication on my screen???I have a twin brushless motor setup on my TwinStar II plane. I did not have any problems connecting it to RVOSD.

You just need to connect power to both ESCs via parallel Y-splitter to the current sensor, and also both signal wires from ESCs via Y-splitter to the THROTTLE channel on the RVOSD.
antonio.adi
05-28-2009, 10:57 AM
ok...tnx...and if i have 2 battery??? one for each esc?
pit3k
05-28-2009, 11:18 AM
ok...tnx...and if i have 2 battery??? one for each esc?No, this way you won't be able to monitor current/mah on one of them.

It is better to connect the batteries in parallel using Y-splitter also, so, it's like that:


BAT-1 = = ESC-1 - MOTOR-1
>= CURRENT-SENSOR =<
BAT-2 = = ESC-2 - MOTOR-2
chiloschista
05-28-2009, 01:04 PM
Code:

BAT-1 = = ESC-1 - MOTOR-1
>= CURRENT-SENSOR =<
BAT-2 = = ESC-2 - MOTOR-2



Dangerous!

You have to isolate each batery from the other, by a Schottky diod for example.
pit3k
05-28-2009, 01:18 PM
Why is this dangerous? Isn't it the same as creating 3S2P pack out of two 3S1P packs?

As long as the packs are the same (new) and reasonably matched (internal resistance), I don't see any major dangers. I have been flying like that for some time now, and no problems so far...


You have to isolate each batery from the other, by a Schottky diod for example.A Schottky diode for upto 20A? Good luck finding such :p
chiloschista
05-28-2009, 08:05 PM
A Schottky diode for upto 20A? Good luck finding such

http://is.gd/Ioms

I usually speak when I know...;)

Battery in 2p configuration "learn" to work together, because they always works together. This is not the case of two separate battery.
Then the strongest battery would feed the weakest battery all the time.

I only speak when I know my chicken:cool:

chilo
pit3k
05-28-2009, 09:23 PM
Battery in 2p configuration "learn" to work together, because they always works together. This is not the case of two separate battery.
Then the strongest battery would feed the weakest battery all the time.Well, I was thinking of the configuration when you have those two patteries connected together permanently. That's what I do, I have them connected all the time during use in a plane as well as charging. So I think I essentially have a 2p pack. I still don't think using Diodes in such case is practised or recommended.

However, if you want to use two different batteries, or batteries that you use individually for another purpose, then I would not recommend using them for such twin engine setup.


I only speak when I know my chicken:cool: OK cool, you can find such diodes, but the power loss is significant - about 10W, which is not really cool :cool: