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Author Topic: Battery powering a layout  (Read 1435 times)

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Offline MalcolmAL

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Re: Battery powering a layout
« Reply #15 on: October 26, 2017, 03:30:42 pm »
I have been thinking about an outside job as well.
Even a regulator chip is going to waste power, there is voltage drop across it and thus even with a small current, watts are wasted. (a big car battery would compensate  :D !)

The only efficient way that I have come up with (thinking, not yet roundtuit ! ) is PWM (pulse width modulation) Somewhere on the forum recently we discussed pwm vs. coreless and came to the conclusion that high frequency pwm would be ok.

Offline MalcolmAL

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Re: Battery powering a layout
« Reply #16 on: October 26, 2017, 04:42:00 pm »
The    only   efficient way
I've just thought of another  ! :-
A tapped battery pack.
I've just had a play with a 4-cell pack of Ni-MH and that provides a creep of my Farish 4F with five coaches,  3 cells not enough to start it moving.
Somewhere I have another pack, so if we have taps at 4, 5 and maybe 6 cells no power lost in the regulator/controller :)

Edit later  : Duchess with five coaches will creep on 2-cell , then nicely progress in speed as cells are brought in, on up to a brisk pace on 6-cell pack of Zinc Chloride.
This is all jolly interesting, must go to the shops tomorrow and get some more NiMH !

« Last Edit: October 26, 2017, 05:11:05 pm by MalcolmAL »

Offline themadhippy

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Re: Battery powering a layout
« Reply #17 on: October 26, 2017, 06:07:17 pm »
sounds like a job for 2 pole 12 way rotary switch,6 forward speeds ,5 reverse speeds and an off,take out the ball bearing in the rotary mechanism and it should  rotate more like a pot.Only problem is such switches are  a bit pricey .
Quote
no power lost in the regulator/controller
I2R The switch contacts have a resistance,theres a current flow so theres going to be some losses,bloody minute,but still a loss

Offline MalcolmAL

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Re: Battery powering a layout
« Reply #18 on: October 26, 2017, 06:37:42 pm »
some losses,bloody minute,but still a loss
:laughabovepost: I think we can agree !

I've just ordered a 2p6 and a 1p12 for experimental porpoises.

The only little? prob I can see for single-cell tapping is that most chargers do it in pairs, so a bit of swapping round from time to time would be a good idea perhaps.

Some currents will need to be measured after our evening meal :)  >>>>

Offline dannyboy

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Re: Battery powering a layout
« Reply #19 on: October 26, 2017, 07:57:03 pm »


Some currents will need to be measured after our evening meal :)  >>>>

Is that Spotted Dick and custard for dessert?   (Sorry).
David.
I used to be indecisive - now I'm not - I don't think.

Offline MalcolmAL

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Re: Battery powering a layout
« Reply #20 on: October 27, 2017, 02:30:06 am »
Approx 3&1/2 hours on and my Farish Duchess is still hauling five coaches at a sedate pace (5coach/9sec ~=40mph ?) on a 4-pack of Ni-MH AA cells and they were just grabbed, not new, not fully charged.
Voltage started at 5.4 now 4.9
SpottedDick = ~15mA  +/- 5mA
« Last Edit: October 27, 2017, 10:09:13 am by MalcolmAL »

Offline MalcolmAL

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Re: Battery powering a layout
« Reply #21 on: October 29, 2017, 01:55:58 am »
Update:
Pleased to be able to report : in excess of 6hr*, sedate>then crawl, running of a Farish Duchess +5coach on 4cells rechargeable NiMH

*given the British climate that should satisfy most summers in the garden  ! ?

Next project : learn about discharge/re-charge cycles of this newfangled NiMH tech ;) !
« Last Edit: October 29, 2017, 09:07:43 am by MalcolmAL »

Offline Izzy

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Re: Battery powering a layout
« Reply #22 on: October 29, 2017, 09:42:15 am »
 
As an alternative, although not cheap, the 2mm SA sell the MedVend 9v PP3  battery/or DC supply handheld contollers, ( I think these are PWM but not sure) @ £30. Meant and sold primarily for Z gauge I believe but work fine with N from what I have seen of them.

Izzy

Online PostModN66

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Re: Battery powering a layout
« Reply #23 on: October 29, 2017, 01:14:11 pm »

As an alternative, although not cheap, the 2mm SA sell the MedVend 9v PP3  battery/or DC supply handheld contollers, ( I think these are PWM but not sure) @ £30. Meant and sold primarily for Z gauge I believe but work fine with N from what I have seen of them.


Interesting....have never heard of these, but found this:

http://zscaletrack.com/medvend/AN-1-C

And this...http://www.2mm.org.uk/products/info/?prodnum=1-500 but the link to the manufacturer's website doesn't work.

Seems cheap enough to me......anyone got any experience with one of these?

Cheers Jon  :)
« Last Edit: October 29, 2017, 01:16:17 pm by PostModN66, Reason: Addition »
“We must conduct research and then accept the results. If they don't stand up to experimentation, Buddha's own words must be rejected.” ― Dalai Lama XIV

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Offline MalcolmAL

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Re: Battery powering a layout
« Reply #24 on: October 29, 2017, 05:26:04 pm »
Only problem is such switches are  a bit pricey .
The classical wafer switches are very pricey !
But I have found some others that may do the job, ( search ebay "1p 12t switch" or "Rotary 1 Pole 12 Way" ) variously approx £2 to £6

The only problem with them is that the detent is fiercely strong :( (feels like driving a tramcar !! )   they are plastic clipped together, the good news is that they can be 'tyre-levered' apart and the spring and two balls fall out ,,,, it remains to be seen if it can be re-assembled !
« Last Edit: October 30, 2017, 03:08:53 pm by MalcolmAL »

Offline themadhippy

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Re: Battery powering a layout
« Reply #25 on: October 29, 2017, 05:51:19 pm »
Quote
But I have found some others that may do the job, ( search ebay "1p 12t switch" or "Rotary 1 Pole 12 Way"
Bog standard combinations (2-6,6-2,4-3.3-4 1-12)are nice an cheap, less than 2 quid from cpc,  as they all fit on 1 wafer and mass produced, its when you want something a bit funky like a 12 way 2 pole as your then into the build it yourself territory, a quick look at rs for such a combination is around £24

 

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