12 - 900v 500a - Contactor

[@SilverTreasures]

Can you demonstrate or explain what would happen if a higher voltage was used such as 48v-52v? I want to use this for my 48v electric golf cart.

[@dokopal]

What these 9 to 36V control circuit (battery or some other sources) are connected is a copper wire coil which (main part of an electromagnet). Your 49V golf cart battery will control the device with no problem. The only risk you are to face is that that coil will be slightly overheating every time the relay is energized. This in turn may/will lead to destroying the wire insulation of the coil and it's eventual failure. 48/36~1.3 times overheating. As such coils are usually designed with safety margins, which may be up to, say, 1.5 times, your 48V may control this relay indefinitely without any issues. In order to see if it is overheating after a very long period of ON state (energized), say 15-30 minutes, you may smell some odor emanating from the device. If you don't smell anything after 30 minutes, you are most like safe to use your cart battery of 48V. Hope this helps.

[@OGBRADASS]

Did you test this yet?

[@TechCentric_00]

@OGBRADASS No as the rated spec for this contactor is 36v going over that voltage may damage it. If your use is 48v I would make sure your contactor support that voltage. Here is one on Amazon amzn.to/3ViilL0

[@Code_hack_]

Thanks for the informative video. Interesting switch device. Could you recommend a few good use cases for using such a device?

[@TechCentric_00]

A main uses case is if your battery is capable of more amperage then a bms can offer you can use a bms to control the contactor and gain access to the full output of the battery but still have protection from over charging and under discharge. Another use case might be if you a need to use a push button switch to control your battery to the load but maybe the voltages and amperage is too high for a push button switch you can use a switch to control the contactor that can handle such a situation. Hope that helps.

[@ChadKurszewski]

Need to correct your reversed terminology: When off, it's "open" (not closed). As in, open circuit, no current will flow in the contactor. When the coil is energized, the contactor is "closed", meaning the contacts are closed, short circuit, allowing current to flow.

[@DIYGuy85]

The spec sheet says to use an external coil economizer. Where do you get that and how do you connect it?

[@TechCentric_00]

Never very familiar with this. But found this forum that may be useful. www.diyelectriccar.com/threads/how-to-add-coil-economiser.196329/

[@michaelspeegle9221]

I am trying to use this to shut down my EG4 chargeverters remotely before generator using relay #2 on a Victron cerbo gx and weirdly it’s not shutting down. I am using a transformer 12v 1amp. It closes fine but never opens. I hear the click both ways on changing relay. Which I use between the red lead and the red power. If I use same setup between red power of Victron external shunt it works as expected. So I am dumbfounded

[@TechCentric_00]

Not sure. I have not really used them that much.

[@michaelspeegle9221]

@@TechCentric_00figured it out the 12v 1amp power was enough to make the shunt run 9v @ 2.8 amp. But 25w is much better than the 150 it was pulling.thank you very much for answering.

[@justforlaughs8988]

I'm having trouble knowing when your closing your relay. Just like a bridge closing it lets traffic through and opening stops traffic in the same way that relay works it should close to let electrons through so I'm just a little confused 🤔 I want to use this with my alternator in my car I have a 390amp alt charging at 15.5v and clamps 430amps at best and this will be charging my lithium bank to charge it. Thanks bro

[@TechCentric_00]

Yeah I think a user pointed out that I used the wrong terminology so the contactor is open by default and when you apply the voltage to the wires it will close thus allowing the energy to flow through. my apologies

[@justforlaughs8988]

@@TechCentric_00 gotcha ok cool awesome seeing her in action!

[@thenachash]

Hi, how do you actually control the output voltage?

[@TechCentric_00]

I use a variable bench power supply to control the activation of the contactor. The contactor is either on or off.

[@thenachash]

@@TechCentric_00 Thank you. I didnt understand that part. I thought the relay actually had the ability to regulate. Thanks for clarifying

[@dokopal]

You meant INPUT (control) voltage and not output 😎