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06-09-2019, 12:18 AM | #11 |
Gone Wild
Join Date: Jun 2011
Location: Houston
Posts: 391
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Re: 48 to 12V reducer wiring
That's interesting. I would have thought that when the batteries are being charged the OBC charges them up and when they reach 64 or so volts the OBC shuts the charger off. I have a cheap 4 wire reducer with no key switch wire connected directly to the batts. Never a problem getting a resting pack voltage of 100% after charging.
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06-09-2019, 08:16 AM | #12 | |
MOD of all BS!
Join Date: Sep 2011
Location: Florida
Posts: 17,477
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Re: 48 to 12V reducer wiring
Quote:
The amount of rise in the voltage of the Powerdrive is controlled by the OBC and is according to which phase of the charge sequence it is in. The OBC must see 58.3 volts or it will not turn off, so the Powerdrive can run up voltage from there to ~65+ volts. |
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06-09-2019, 09:59 AM | #13 | |
Gone Wild
Join Date: Jun 2011
Location: Houston
Posts: 391
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Re: 48 to 12V reducer wiring
Quote:
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06-09-2019, 02:38 PM | #14 |
MOD of all BS!
Join Date: Sep 2011
Location: Florida
Posts: 17,477
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Re: 48 to 12V reducer wiring
If we are speaking of your reducer, it would benefit you more to get the Neg (-) lead over to B- at the controller so the OBC can account for its energy usage. The Pos (+) can run to the MPP post, but if you run it to the battery side large post at the solenoid, it cleans up the battery compartment and avoids corrosion on your connection.
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06-09-2019, 02:47 PM | #15 | |
Gone Wild
Join Date: Jun 2011
Location: Houston
Posts: 391
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Re: 48 to 12V reducer wiring
Quote:
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06-10-2019, 02:54 AM | #16 |
Gone Wild
Join Date: Jan 2017
Location: Queensland Australia
Posts: 1,332
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Re: 48 to 12V reducer wiring
I know that a reducer with no external load will not pull a great deal of power but I always prefer to switch a reducer so that you are not pulling even that little bit from the batteries constantly. It also means that the reducer is likely to last longer if it is not on continually. I have my (4 wire) reducer connected through a relay which is controlled by the key switch so that it is not on all the time.
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06-10-2019, 08:02 AM | #17 |
Gone Wild
Join Date: Oct 2018
Posts: 595
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Re: 48 to 12V reducer wiring
Why can you just take the negative lead from the converter off of the battery, and run it through the coil where the negative lead from the battery to the controller goes, and then hook it back up to the battery? this way it would sense the current from the converter and you wouldn't need to wire it to the controller.
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06-10-2019, 08:24 AM | #18 |
Gone Wild
Join Date: Sep 2012
Location: Charlotte, NC
Posts: 9,329
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Re: 48 to 12V reducer wiring
There is no coil in the OBC, that is solid state Hall Effect Sensor that measures the current and I am not sure how the much larger battery cable running next to your converter wire would interact/affect the reading.
The best solution is to use the black wire with a yellow butt connector or the negative connection post the engineers that designed the system already provided for that connection. |
06-10-2019, 12:08 PM | #19 | |
Gone Wild
Join Date: Oct 2018
Posts: 595
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Re: 48 to 12V reducer wiring
Quote:
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06-10-2019, 01:05 PM | #20 |
MOD of all BS!
Join Date: Sep 2011
Location: Florida
Posts: 17,477
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Re: 48 to 12V reducer wiring
According to which cart, but on most it comes from the MPN cable at the B-. It is a common crimp connection with a short pigtail. Some have a stud that allows for accessories so the MPN cable goes on with it, then accessories, then another nut. You will know it when you see it.
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