I have installed 8 x 30 watt 12v led floods in my garden which are powered directly from a leisure battery but they don't work??

[SeawolfGB]

I am trying to find a pir that will!

 

[JohnD]

A 30W lamp is about twice as bright as you need for a room. You have 8 of them? Is it a football pitch?

 

[SeawolfGB]

It is a very large garden!

 

[SeawolfGB]

This is my setup so far......How would i wire in a 12v relay in the following scenario, so that the pir triggers the relay to bring the lights on...

 

[Alec_t]

it works out at a running amperage of 60 amps.

Eh? 8 x 30W = 240W.
240W/12V = 20A.
Are your lamps actually drawing three times their theoretical current?
You have a 25A fuse for a 60A load? Check if it's blown.

 

[SeawolfGB]

link to lights:

12v 30 w light

 

[SeawolfGB]

Fuse has not blown ?

 

[SeawolfGB]

I thought it was 20amps ?

 

[Why Not Indeed]

If the PIR isn't rated for the load then you want to run the output side of the PIR to a contactor. Search eBay for "12V contactor."

 

[mattylad]

Is the 12v switch rated for the current?
When you say "25a" cable, what size and type is the cable?
Is it 2.5mm twin and earth you have used?

Have you actually got a multimeter? have you done any voltage measurements?
What is the voltage measured at the first lamp?
What is the voltage measured at the last lamp?

For now take the PIR out of the equation, bypass it until you can sort out adding a relay/contactor capable of the current.
(You can put it in a waterproof box next to the current PIR)

You wire the contactor in so that you have the 12v going to the PIR as it is but the output of the PIR goes to the A1 terminal of the contactor.
The 0V goes to the relay A2.
The +12v supply to the lamps goes to the contactor common (L1) and the N/O output (T1) then goes to the lamps.
The main 0v goes to the lamps.

Instead of a contactor you could use an automotive relay, these are designed for high currents and of course are 12v.
In which case they are different pin numbers.

However, you really do need to be using a meter to measure the voltage at the lamps.
You may have volt drop along the cable & this could explain why it's not working.

 

[mattylad]

It is a very large garden!

Not if it's only 30m of cable to the last PIR and you have 8 of them.
Once these work you will find that it is like a football pitch, your garden will be able to be seen from thunderbird 5 !!

 

[SeawolfGB]

the cable is 2.0mm twin flat 25 amp rated cable is here (no earth as the lights only have pos and neg for 12v) There is only one independant PIR. The lights themselves do not have a pir. The switch is this one illuminated switch. I have broken my multimeter but have one on order. Cheers

 

[SeawolfGB]

Not all of the garden is covered but there are a number of security reasons why I have chosen this installation and not all of them are facing in the same direction

 

[SeawolfGB]

This is the PIR spec PIR

 

[SeawolfGB]

Just ordered 2 of these (a spare in case I blow one up, LOL) Relay