Separate 24 volt circuits to LED Headlights

[Kashmir]

Originally Posted by TX_RDXGuy

I run a pair of the D series Rigid LED driving lights along with a center LED light kit. Both are fused on the positive lead, have a dash mount switch and are wired directly to a different 24VDC battery set (three 8V batteries). Works great....

I want to know where you have three 8 volt batteries separate from your pack!
Not a lot of extra room on the Precedents, especially with a rear seat...

[whit71]

Originally Posted by Hunter450

TX_RDXGuy,
That is exactly what I want to do. What amp rating did you use on the fuses? Did you wire the lights ground wires back to the B- connection on the controller?

If you don't ground to the B- on the controller the OBC cant read the voltage used by the lights which will result in not properly charging the batteries.

[Sergio]

This is a very specific answer that only applies to this very specific case.

Since your lights will have approximately the same current draw, it should work with the proposed split system.

Connect the 2 COM tabs of your DPST switch together and run a wire to the center battery connection, either negative of bat #3 or positive of bat #4, which are different ends of the same cable.

One light negative goes to Controller B- and the positive to a N.O. tab on the DPST switch.

The other light positive goes to pack positive and the negative goes to the other N.O. tab of the DPST switch.

The OBC will only account for the current used by the light connected to B-, but it assumes 48v so that will work since the light connected to the second half of the pack should have a very similar current draw.

[TX_RDXGuy]

I'm not following how the cart's OBC system knows anything about the LEDs when the cart is charging with the LEDs off. So far no issue (2 charging cycles) but I'm new to carts so explain the need for the negative side of the lights being connected to the controller's B-.

I used a combination of three of the six batteries (24vdc) for the Rigids. These D series LED pods can accept up to a 50 vdc input. Output will always be the same as long as you have at least a 13.8 vdc input. Draw is 34.5 watts and 2.5 amps. The fuse is 15 amp.

[whit71]

Originally Posted by TX_RDXGuy

I'm not following how the cart's OBC system knows anything about the LEDs when the cart is charging with the LEDs off. So far no issue (2 charging cycles) but I'm new to carts so explain the need for the negative side of the lights being connected to the controller's B-.

I used a combination of three of the six batteries (24vdc) for the Rigids. These D series LED pods can accept up to a 50 vdc input. Output will always be the same as long as you have at least a 13.8 vdc input. Draw is 34.5 watts and 2.5 amps. The fuse is 15 amp.

think about it like this, if you have a gas tank that instead of a fuel gauge that reads the level of the tank you have an inline meter that measures the fuel used. now add a second engine to the tank but add it after the meter. the meter doesn't see the fuel used from the second engine. The OBC is kinda like that, if you pull voltage from the batteries that it does not see it cant properly charge the batteries.

[TX_RDXGuy]

I'll run it down again to 70% then charge it and test each battery to see if they are charging right. If not I'll move the negative over to the controller B- and run the same test.

[Sergio]

Originally Posted by TX_RDXGuy

I'll run it down again to 70% then charge it and test each battery to see if they are charging right. If not I'll move the negative over to the controller B- and run the same test.

Don't bother with the test, it will not prove anything.

The way the OBC works is well documented, it measures the current removed from the batteries as the current travels on the negative wire pass the OBC to the Controller B-.

If You have any current being discharged from the battery that does not go through that cable, the OBC will not know about it.

Depending how much You discharge directly from the batteries between charging cycles, the OBC 10% overcharge rule may be enough to compensate.

Of course if you just run all negatives from controller B- as the system is designed to work, You don't have to worry about anything.

[TX_RDXGuy]

Really? OK. I'm not wired that way but I appreciate the suggestion.

[Kashmir]

TX, you really need to take what Sergio is saying to heart and apply to your cart. Whit71 had the best explanation on how the OBC "knows".
These suggestions will make your batteries, your cart, and you happy in the long run.


Sent from my iPhone using Tapatalk

[TX_RDXGuy]

I'm 100% open to suggestions guys but the "do it because I say so" and "BTW, don't bother doing a simple test to validate it" is a flag for me to be careful.

Is there a technical reference for the OBC or logic flow for the charging system on the Precedent? That would be helpful.