Shunt question

Desert Rat
Desert Rat Solar Expert Posts: 147 ✭✭✭
in Off Grid Solar & Battery Systems #1
I am setting up a new system which has a shunt for a battery monitor. So one side of the shunt is connected to battery negative and the other is connected to the inverter negative. I think I understood this clearly at one time, but now i'm confused. 
To which side of the shunt should ground be connected?
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  • Desert Rat
    Desert Rat Solar Expert Posts: 147 ✭✭✭
    #2
    I forgot to mention that I am not enabling the ground fault protection in the charge controller. I want to ground the battery negative.
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  • BB.
    BB. Super Moderators, Administrators Posts: 33,641 admin
    #3
    It does not matter for safety, but put the ground on the common bus side.

    That way, if there is some sort of short circuit to ground, the shunt will record the total energy flow.

    If you put the ground between the shunt and the battery, any leak to ground will bypass the shunt and be unmeasured.

    Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
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  • Desert Rat
    Desert Rat Solar Expert Posts: 147 ✭✭✭
    #4
    BB. said:
    It does not matter for safety, but put the ground on the common bus side
    When you say "common bus side", do you mean the inverter/DC negative side of the shunt?
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  • BB.
    BB. Super Moderators, Administrators Posts: 33,641 admin
    #5
    Yes.

    -Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
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