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Forum Index : Electronics : I NEED HELP W/ A 12V DIGITAL TIMER WIRING

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solargrower
Newbie

Joined: 25/06/2009
Location: Australia
Posts: 6

Posted: 10:23am 25 Jun 2009

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Gday,

I'm a real amatuer with all things electronic, but i've recently purchased my self a 12 volt digital timer, 12volt car battery, 12volt bilge pump and a solar panel...

I'm setting up a little project to automatically water some plants while im away for extended periods of time.

I opened the digital timer and tried to figure out the wiring for hours before giving up and scanning the instructions into the computer in hope of finding someone on this website that can make sense of the wiring for me.

Can some one please explain what wires need to go into what ports?? That would be greatly appreciated.

Thanks.

Tinker

Guru

Joined: 07/11/2007
Location: Australia
Posts: 1904

Posted: 03:35pm 25 Jun 2009

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No need to open the timer when the connections are clearly shown as on your last picture.
I would connect it this way:
Link pins 2& 3.
Connect +12V from battery to this link.
Connect + of bilge pump to pin 5.
Connect pin 1 and - of bilge pump to - battery.

+ = Positive terminal
- = negative terminal

Do place a fuse (~10A)into the positive lead from the battery. Use one of these blade style car fuse holders that has leads, these are easiest to connect.
Get a spare fuse blade in case it blows because you connected something wrong

Klaus

solargrower
Newbie

Joined: 25/06/2009
Location: Australia
Posts: 6

Posted: 03:15am 27 Jun 2009

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Thanks very much for your help.

I think i understand your wiring system, and have drawn a basic picture of the set up in paint.

Here is a copy of the picture..

Can you please tell me if this is correct?

Tinker

Guru

Joined: 07/11/2007
Location: Australia
Posts: 1904

Posted: 02:50pm 27 Jun 2009

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Basically yes. You should connect the solar panel to the timer side of the fuse, that way everything connected to the battery is fuse protected.

Do think about the comments above re solar panel & battery size.

Klaus

Fernanda

Newbie

Joined: 05/02/2011
Location: United States
Posts: 2

Posted: 04:55am 05 Feb 2011

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Well, if you don�t mind there�s no need to open the timer to connect like shown in the picture. All you can do is connect like this, link pins 2 & 3; try to connect in 12v in battery; also connect the bilge pump to pin in the 5; and then the last is pin 1 to bilge pump to battery. However, you can also try to search in online maybe you can found some topic that related in your problem.

My Sports Timer

davef
Guru

Joined: 14/05/2006
Location: New Zealand
Posts: 499

Posted: 09:02am 05 Feb 2011

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Also, think about a charge controller or you could end up cooking the battery.

Alasdair
Regular Member

Joined: 12/01/2011
Location: Australia
Posts: 62

Posted: 01:56pm 05 Feb 2011

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Hi there
Good idea having a charge controller, less than a hundred bucks
will get one with charge regulator and low battery cutout, which
will save your battery from over discharge in the event of not enough
sun and too much pump consumption, and the cheapie I bought
even compensates charge voltage for ambient temperature and gives
a mass of information about accumalation, voltage, current etc.
It kind of completes the system.

Amc-elec

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