Need a diagram for Buffer pack on Jive ESC.

[recurry]

Originally Posted by Mystic3D

I ended up with a (4) 1/2A 1500 mah pack as it could withstand the load on it's own for 2 minutes. My 1000 AAA pack lasted about a minute under load before voltage dropped off.

The purpose of it as Kontronik describes seems to be to prevent brown-outs rather than as a backup for a complete failure. However, with such a large pack you are somewhat protected from that as well! The issue of course is if the ESC fails in such a way as to short internally and in that case you are hosed no matter what. I've opted just to be covered for brown-outs and built a small pack out of 8 1/2AAA for 800mah.

[Nko15]

why 8? 4 will be enough... 1 run 4 AAA 800mAh eneloops.. gives enough juice for 2 hours of Vbar setup..

use of bufferpack comes in handy when the main batterie unplugs.. or 1 of the other esc cables.

[recurry]

Originally Posted by Nko15

why 8? 4 will be enough... 1 run 4 AAA 800mAh eneloops.. gives enough juice for 2 hours of Vbar setup..

use of bufferpack comes in handy when the main batterie unplugs.. or 1 of the other esc cables.

As I wrote, I'm using 1/2 AAA not AAA. These are 400mah - takes 8 to get 800mah. Makes a nice small little pack that fits in a small footprint using the 1/2 AAA's.

[lubemupski]

I too struggled with this issue of connecting a buffer pack. I think i have it figured out and have sketched out a diagram. If anyone sees any issue please let me know and i will update. Hopefully this helps someone out!

[JustinS]

Anybody used the DCUp as their buffer?? Would do the job, just not for as long as batteries.

[MrMel]

Originally Posted by JustinS

Anybody used the DCUp as their buffer?? Would do the job, just not for as long as batteries.

Yes, I have been using those forth and back a long time since their first version.
(I personally do not use them all the time but always when I do testing of new beta versions etc)

[JustinS]

Originally Posted by MrMel

Yes, I have been using those forth and back a long time since their first version.
(I personally do not use them all the time but always when I do testing of new beta versions etc)

What is your thoughts on using these as "buffer packs"?
Cheers

[MrMel]

Originally Posted by JustinS

What is your thoughts on using these as "buffer packs"?
Cheers

I use them a lot when doing beta testing, especially when I test new BECs that Im uncertain of performance.

- Yes, it helps the BEC a LOT, keeping the voltage up.
- Yes, you can do emergency autos if you get a ESC with bec failure.

- No, its not enough juice to do a slow fine auto.

So in the last case its better with a buffer pack, Im a master of emergency autos as I betatest stuff almost every flight, so it depends on what your after.
The plus is that you always know if original BEC works etc, no need to check whole system all the time.

[Dead Meat]

Originally Posted by Dumbthumb75

I soldered an 800mah eneloop pack to a switch and just plugged it into an available port on my RX.

Easiest way if you have any free ports.

Anyone using SK-720, does this also work with Skookum Powerbus, just plug in to a free port in it?

[desertstalker]

Originally Posted by Dead Meat

Anyone using SK-720, does this also work with Skookum Powerbus, just plug in to a free port in it?

Should do, only requirement for buffer pack is that it is connected to the power supply AFAIK if you use the jumper all +ve pins on the powerbus are connected together. If your not sure check the pins you intend to use with a multimeter.

[kouasupra]

This thread should be a sticky.

[spektrex]

What happens if the bufferpack is half empty or worse? Some people plug them right into a receiver slot, but I suspect serious amps when the pack is flat or almost empty.

I just plugged in main power on a 75% charged pack, at less then 5 minutes it was at 97% again, proving rather high current to charge the pack from the receiver bus. Will it be up to that task at all times?

[desertstalker]

Originally Posted by spektrex

I just plugged in main power on a 75% charged pack, at less then 5 minutes it was at 97% again, proving rather high current to charge the pack from the receiver bus. Will it be up to that task at all times?

How big a pack? The few hundred mAh battery backs shouldn't pull even close to the 5A ish limit on a single servo connection. 25% of even a 1Ah pack in 5 mins is 3A, this is not really a problem, its meant to be a buffer, and to power servos for long enough to auto in (a min or two at most).

If it got quite low I would suggest you charge it externally.

[rmalt]

Could you use a LiFe 6.6 volt pack and the Jive bec at the same time on the same bus?

[MrMel]

Originally Posted by rmalt

Could you use a LiFe 6.6 volt pack and the Jive bec at the same time on the same bus?

No, as it will be drawn completly empty it will not help at all.

[rmalt]

Originally Posted by MrMel

No, as it will be drawn completly empty it will not help at all.

I see that everyone is talking about using 4 AA eneloops so if you BEC is set for 6 volts what would happen if you used 5 AA eneloops to make 6 volts?

[MrMel]

5.6v or lower use 4 cells
5.8 or 6v use 5 cells.
That is what the manual says.

[NRPY]

Or the DC Up capactor pack.

[desertstalker]

Originally Posted by NRPY

Or the DC Up capactor pack.

Wont help if the BEC fails completely though, the buffer pack will at least give you the juice to auto down if the ESC blows up or something happens with the flight pack.

[NRPY]

I'm not worried about that kind of failure. If that does happen, I've likely got bigger problems anyway. I'm mainly concerned about brownouts due to servo feedback.