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Thread: Grounding a battery

  1. #11
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    Quote Originally Posted by Naptown View Post
    Where would be the proper place to put the OCPD between modules and CC or between CC and battery?
    At the sources. (Modules and battery post.)

    Or do it just like you would if you grounded the system, except no ground rod or earth connection. That way only one OCPD on each polarity. Understand?

    Just like a car ground system.
    MSEE, PE

  2. #12
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    Getting fuses inside a door operator could be a challenge. Or are we just talking on the solar side and not the load side on the battery.

  3. #13
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    Quote Originally Posted by Naptown View Post
    Getting fuses inside a door operator could be a challenge. Or are we just talking on the solar side and not the load side on the battery.
    Well crap, that did not dawn on me. Alright as close to the battery box as possible. The controller is not a source, only the panels and batteries are sources. Like any source you want to install OCPD as close to the source as possible.

    If you stop and think about it, it makes perfect sense. If you were to put the OCPD at the utilization device, you have all that wire in between the source (power) and the load device, all that wire is left unprotected. That is why your main breaker panel is installed extremely close to the meter.
    MSEE, PE

  4. #14
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    Rich thinking out loud here, but if this is a 1-panel system, you do not need to fuse the panel. It does not gain you anything. Well providing the wire size is correct. You can short the panel all day long and nothing will happen. Th epanel cannot generate enough current to burn up the wire, and the voltage is not high enough to electrocute anything..

    Is there any AC circuits in this garage or anything that might accidentally make contact> Something like a overhead service feeder falling on the panel or structure?
    MSEE, PE

  5. #15
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    #10 USE2 wire for everything, 1 12V 60W panel, Nothing electric within 50' Nothing overhead all underground.
    There may be an OCPD within the operator. The motor is 600W.

  6. #16
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    OK then Rich the only thing that has enough capacity to do any damage is the battery itself. No way a 60 watt panel can damage #10 AWG as the fusing current on 10 AWG is 330 amps. Isc on a 60 watt panel is around 4 or 5 amps max. So the only cable section you have that has potential for damage is between the CC and battery.
    MSEE, PE

  7. #17

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