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Thread: Wiring schematic for battery charger

  1. #1

    Default Wiring schematic for battery charger

    Hi all,

    I wanted to run this by you all to see if I've got my wiring diagram right for hooking my battery charger up with the rest of my system. Please view the attached schematic and let me know if this is the correct way to hook up my Iota charger. I have the Midnite Solar MNDC box which will house most of my wiring.



    Thanks.

  2. #2
    Join Date
    Jun 2003
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    pittsburgh, pa
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    10,262

    Default Re: Wiring schematic for battery charger

    looks ok in general as long as the connection points can accommodate that number of connections.
    i am not familiar with your panel and i am curious as to why there is a cb going to the ground with a resistor as well? i assume it's ganged with the cb next to it, but i always thought it to be a no no to do that on a ground.
    NIEL

  3. #3
    Join Date
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    Default Re: Wiring schematic for battery charger

    I believe that that 5amp breaker is the "ground fault" detector... It is ganged with the 63 amp breaker as a master panel disconnect. The resistor is probably there to provide static discharge when the ground breaker trips.

    It is so crazy to put a CB in the safety ground path for anything--Somebody does not understand how NEC / NRTL fire/personal safety design really works. They tried to add ground fault detection from 120 VAC branch circuits (5 mA) to prevent electrocution hazards and turned it on its head to provide a 5 amp ground fault trip out of "off the shelf" hardware to prevent fires--a 5 amp breaker sure ain't going to save anyone from electrocution... (AC ground fault detection is easy--DC ground fault is not--at least not off the shelf--but AC GFI was not off-the-shelf either... ).

    -Bill
    Last edited by BB.; February 5th, 2010 at 11:50 PST.
    20x BP 4175B panels (replacement) + Xantrex GT 3.3 inverter for 3kW Grid Tied system + Honda eu2000i Inverter/Generator for emergency backup.

  4. #4

    Default Re: Wiring schematic for battery charger

    There will be a battery positive bus bar in the Epanel the Iota can terminate there after going threw an appropriate sized dc breaker. the negative would also terminate on the negative bus bar attached to the shunt.

    The GFI breaker is shown in the diagram and is required by NEC you can thank everyone's favorite friend for that John Wiles. The Midnite Epanel does not ship standard with it it is an option as certain charge controllers have it built in. While I agree it is a bunch of BS and could even be more dangerous it is the code.
    16 Trojan L16RE-B @ 48v XW6048 Inverter with ComBox. 3250 watts of Suntech panels wired 5 in series running 300 feet to a Classic 200. 3000 watts of solar world modules wired 2 in series running 120 feet to a Classic 150. Bergey XL1 on a 90ft tower running to an AC Clipper and then to a Classic 250. Lister Clone spinning a 120v gen rectified and fed to a Classic 200. Electric hot water heater and induction cook-top (Replaced the propane unit. Good riddance)

  5. #5

    Default Re: Wiring schematic for battery charger

    Thanks for the responses, guys. The main schematic comes directly off the Midnite Solar website. I was planning on leaving the 63A and 5A breakers out of the system. I could see no reason for using them.

    Sounds like you don't see much of a use for them either, Bill...


  6. #6
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    Default Re: Wiring schematic for battery charger

    Hmmm... May be I am wrong here--Two guys with ID's that have "Crazy/Czy" in their names agree with me.

    -Bill
    20x BP 4175B panels (replacement) + Xantrex GT 3.3 inverter for 3kW Grid Tied system + Honda eu2000i Inverter/Generator for emergency backup.

  7. #7
    Join Date
    Jun 2003
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    pittsburgh, pa
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    Default Re: Wiring schematic for battery charger

    you know wiles is starting to scare me. first he makes everybody run the ground into the house inviting lightning and then he puts a breaker on it. trying to think of a 5 letter word for stupid?
    NIEL

  8. #8

    Default Re: Wiring schematic for battery charger

    That leads me to another question...My conductor leading from the solar panels to the charge controller in the garage will be running through my attic. I am using EMT conduit throughout the attic as according to NEC. Should my equipment ground from my panels 1) travel through the conduit and attach to my system grounding bus, 2) run outside of the conduit and bypass grounding bus and attach directly to grounding rod, 3) or bypass the attic and run outside and attach directly to grounding rod?

    I guess there is also option 4) do not bother with grounding the panels.

    Since I'm doing my own installation and live out in the middle of nowhere, I don't technically have to build this to NEC code, but I'm trying to follow it as much as makes practical sense.

  9. #9

    Default Re: Wiring schematic for battery charger

    I vote for 3 as long as it isn't tied to the negative leads anywhere.
    16 Trojan L16RE-B @ 48v XW6048 Inverter with ComBox. 3250 watts of Suntech panels wired 5 in series running 300 feet to a Classic 200. 3000 watts of solar world modules wired 2 in series running 120 feet to a Classic 150. Bergey XL1 on a 90ft tower running to an AC Clipper and then to a Classic 250. Lister Clone spinning a 120v gen rectified and fed to a Classic 200. Electric hot water heater and induction cook-top (Replaced the propane unit. Good riddance)

  10. #10
    Join Date
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    Los Angeles, Ca.
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    1,332

    Default Re: Wiring schematic for battery charger

    Quote Originally Posted by halfcrazy View Post
    I vote for 3 as long as it isn't tied to the negative leads anywhere.
    Agreed.
    (18 character fill-in nonsense jabber.)

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