Will 12v automotive relays survive 36v?

[Klunky Chris]

Hello all,
I've wired up my 10A 36v->12v converter on my older marathon with some LED lights. The converter is currently fed through the key switch. It's not drawing anywhere near 10A with my LEDs, but I want to get that current off the switch (which I don't know the rating of)

3A-10A 36v relays are hard to find and all seem to be in the $20-$60 range.

Does anyone have experience with a standard 12v Bosch type relay on a 36v cart? Will the coil withstand the voltage? I'm sure the contacts would be ok since the amperage would be acceptable, but I don't know if the coil will melt with the extra voltage, especially since it would be continuous duty.

If not, maybe 24v relays?

I guess it's possible to put a resister in line to drop the voltage. That may work also...

Just wondering what others have done.

Thanks!

[vagabond]

why not just wire it up direct, the draw is very minimal, all three of my carts are wired direct with no problems. 36v 42v and 48v
Just make sure there is a fuse on the + side of the battery pack going to the converter

[JohnnieB]

The relays used in the legacy type 36V chargers have 36V coils.

Search for a Potter Brumfield T9AP1D52-36-01 (36V coil, 30A N.O. contacts)

You can find them on-line for less the $5.00.

[Volt_Ampere]

Don't use a 12V relay on 36V. The coil will overheat and fail. You can find 36V relays - but they are not as easy to find as 12V ones.

[teecro]

Originally Posted by JohnnieB

The relays used in the legacy type 36V chargers have 36V coils.

Search for a Potter Brumfield T9AP1D52-36-01 (36V coil, 30A N.O. contacts)

You can find them on-line for less the $5.00.

http://www.newark.com/te-connectivit...FQIcaQodrYYFzA

[Klunky Chris]

Thanks JohnnieB. That relay is also available at digi-key where I WAS looking and missed it...
It really helps having a part number! lol

I checked Amazon as I'm addicted to 2-day Prime shipping, but no dice... LOL

Vagabond, I don't want to wire it direct as I don't want a parasitic load draining my pack. Call me an efficiency nut...

[timmyjane]

Wire the relay to two batteries. Positive to the switch and the ground to the second battery negative. That will give you the 12v you need to activate the relay.

[timmyjane]

Also you could try a DC-DC Solid state relay. They have a wide range of input voltage.

[cgtech]

As far as i know, a true SSR can be activated by DC power, but can only switch (turn on/off) AC power. Something about "latches on" when switches DC power.

[timmyjane]

DC-DC SSR
http://www.amazon.com/uxcell%C2%AE-S...ilpage_o01_s00

It seems that it is important to properly place the load and source correctly when using a DC DC SSR. The source/battery should be placed in #2 on the output and will close to #1. If the supply and load are reversed the latching problem could occur.