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Old 02-20-2018, 02:55 PM   #1
Rwalsh77
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Default Onboard Charger Killswitch

Wonder if this simple diagram will hold water?

Looking to have a relay installed online with the charger but when not in use send the voltage to the key essentially creating a killswitch in the process




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Old 02-20-2018, 02:59 PM   #2
scottyb
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Default Re: Onboard Charger Killswitch

No, that relay will not take the charge current.
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Old 02-20-2018, 03:05 PM   #3
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Default Re: Onboard Charger Killswitch

Says it’s rated for 30a. Charger is 5a. Would more than that go through the key when off?


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Old 02-20-2018, 03:38 PM   #4
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Default Re: Onboard Charger Killswitch

A 5a charger is not sufficient for a golf cart charger.
A wet cell battery needs a bulk rate charge equal to 10% of it's capacity or the heavy elements will be left on the bottom of the cells. Over time the water will stagnate reducing the battery capacity and useful life.

You need a 18-20 amp charger.


My understanding is the relay is a low amperage switch capable of handling a 30a impulse
I do not know of it being rated for constant charging current but, somebody else may say differently.
There are other ways you can use this relay to disable the key switch or the solenoid activation circuit which I think would be a much better application.
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Old 02-20-2018, 03:52 PM   #5
Rwalsh77
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Default Onboard Charger Killswitch

Forgot to mention that I have converted to lithium.

Regardless. How do you suggest I go about this concept? Should I just find a simple SPDT switch? My main goal is to prevent parasitic drain from the charger but thought it would be cool to dual purpose it to a killswitch too


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Old 02-20-2018, 04:15 PM   #6
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Default Re: Onboard Charger Killswitch

Is your lithium charger onboard?

If so, just use a 120vAC coil relay inside the cart with the key switch power using the N.C. contacts.

Edit: Just noticed your "parasitic load" comment, not sure how that can happen, I thought You are trying to make sure You would not drive with the charger plugged in.
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Old 02-20-2018, 04:20 PM   #7
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Default Onboard Charger Killswitch

Yes. Onboard charger, hence why I want to be able to “disconnect” it when not charging.

Not following what you described though. The relay I have is 250vac 30a. Isn’t that exactly what I had drawn up?


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Old 02-20-2018, 04:37 PM   #8
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Default Re: Onboard Charger Killswitch

Quote:
Originally Posted by Rwalsh77 View Post
Yes. Onboard charger, hence why I want to be able to “disconnect” it when not charging.

Not following what you described though. The relay I have is 250vac 30a. Isn’t that exactly what I had drawn up?


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Nope, You have a 48vDC coil relay.

A 120vAC coil relay would be wired with the relay coil in parallel with the incoming AC power to the cart.

When you plug the AC plug to the wall, the relay would turn ON and disconnect the power to the key switch.

Is the 5amp you mentioned the AC power requirement to the charger or its DC output?
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Old 02-20-2018, 04:40 PM   #9
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Default Re: Onboard Charger Killswitch

DC output

Now I’m following along. Let me research a bit. I like to learn but if you can draw that up it would be much appreciated.




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Old 02-20-2018, 04:42 PM   #10
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Default Re: Onboard Charger Killswitch

Charger and cables (un-mounted)


Power port



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