Battery backer

Discussion about Tx, Rx, Servo's, Batteries, Chargers, and all the other things we like to talk about..
Moderator: VinceC
User avatar
Antonia
Posts: 98
Joined: 17 Mar 2015, 22:30
Location: Oxfordshire

Re: Battery backer

Post by Antonia » 07 Jun 2019, 08:29

Hi Rog,
Have you ever thought about magnetic switches? Just to throw another idea out there....
Mel and I have used Jeti - https://www.esoaringgadgets.co.uk/index ... ath=46_108
and
T9's Hall switches - https://www.t9hobbysport.com/search?s=Switch
to good effect, on our larger models, and they have no moving contacts to wear and fail, and with the Jeti main switches you can control both high voltage motor and receiver/servo circuits at the same time with a ESC with a energising switch function, expensive yes, but they work well for me, but just call me "a Jeti fan girl!..." sorry for crashing the party :oops: ...
Antonia
Last edited by Antonia on 07 Jun 2019, 21:19, edited 1 time in total.

User avatar
Peter Balcombe
Posts: 875
Joined: 18 Mar 2015, 10:13
Location: Clevedon, North Somerset, U.K.

Re: Battery backer

Post by Peter Balcombe » 07 Jun 2019, 09:53

Thanks Antonia - a good alternative, albeit at a price as you say.

Roger, unfortunately I don’t have any specific component in mind as I have not used anything heavier than the heavy duty charge point slide switches in models I have built so far.

It depends how many servos you are expecting to cope with, but you are probably looking at reliably switching up to 8-10A to be safe with a large model with lots of high power servos.
There are some heavy duty double pole slide switches out there, but I think most tend to be rated at <5A, so you need to check the specifications for each carefully.
Miniature toggle switches are also usually limited to 6A @ 28V, so you are probably looking at standard size toggle switches to get 8A or more. Toggle switches also tend to have silver or gold plated contacts which is better than plain brass.

There are so many different switches out there, so you have to be able to look at the specifications to see what each are capable of. Unfortunately, many modelling suppliers just sell “switches” or “heavy duty switches” without identifying actual current ratings. You often tend to have to go to an electronic component supplier to get specifications. Note that you need to look at the low volts DC rating, not the 240v AC rating.

Jolly Roger
Posts: 277
Joined: 30 May 2015, 20:35
Location: Sutton Bank, North Yorkshire

Re: Battery backer

Post by Jolly Roger » 08 Jun 2019, 14:49

Thanks Peter and Antonia.

Those switches look nice but as my main aim is reliability I think I'll stick with directly plugging the batteries into the receiver (via diodes). This minimises connections and component count.

It is a bit fiddlier than switches every time I want to fly, but the first models I'm converting to 2.4 are all large with accessible receivers - even my big hands fit.

When I get round to my smaller models where space is tight, I may try the T9 switches Antonia mentioned - they have a nice battery backer function too.

Thanks again.
Rog

User avatar
jimbo
Posts: 305
Joined: 18 Mar 2015, 21:32
Location: Cornwall

Re: Battery backer

Post by jimbo » 22 Jun 2019, 00:08

[quote="Jolly Roger" post_id=23245 time=1560001766 user_id=497]
Thanks Peter and Antonia.

Those switches look nice but as my main aim is reliability I think I'll stick with directly plugging the batteries into the receiver (via diodes). This minimises connections and component count.

It is a bit fiddlier than switches every time I want to fly, but the first models I'm converting to 2.4 are all large with accessible receivers - even my big hands fit.

When I get round to my smaller models where space is tight, I may try the T9 switches Antonia mentioned - they have a nice battery backer function too.

Thanks again.
Rog
[/quote]

On bigger models i do away with switches now, and just solder a multiplex greenie to the battery. Remove the greenie to disconnect and no wear on the RX or battery connections. If you then use diodes you can also charge by building a standard charge lead you make up to plug into you greenie so bypassing the diodes. With a two batt system has the advantage the battery and rx connection is fully redundant to the RX. This is not the case with the jeti bec 2, with 1 lead into RX. Obviosuly you need a spare input into the RX. I use two LiIons that a wired using a standard 4S balance lead and i can charge them and balance as a 4s pack from one input to the battery charger.

User avatar
Cliff Evans
Posts: 1634
Joined: 13 Mar 2015, 10:32
Location: Bristol
Contact:

Re: Battery backer

Post by Cliff Evans » 22 Jun 2019, 08:41

I have had a couple of the "cheaper" magnetic switches fail on me! I now use Emcotec switches. More expensive but much more reliable.
https://www.nexusmodels.co.uk/emcotec-d ... 11062.html

Post Reply