Hello,
I'm planning on setting up a grid-tied hybrid system (48V bat + PV). I read through (among other things) the Grounding Made Simpler p1-3 (thanks a lot FilterGuy!), and the manual for the inverter I'm focusing on (Deye Hybrid 5-8kw single phase, manual attached).
A bit of background first: the grid here (somewhere in Eastern Europe) is 230v single phase. It is transported in 3phase and in a distribution box outside the house each property takes one of the phases. The distribution box has a big grounding connector stuck in the ground, and the N is grounded this way. In the end 2 wires (N and L) come in the property, where the N is grounded.
The yellow-green/PE conductor "originates" in the main house panel, where it's bonded to N, and you should install an RCD (residual current circuit breaker) on the L and N lines. It breaks the connection if it finds any current leaking from L to somewhere other than N.
Now the question: according to page 5 of Part 3 of Grounding Made Simpler series, one should avoid having a second grounding rod, because a nearby lightning can induce current between the two rods. In my case, if I stick a grounding rod around the panels to ground them, the battery, and connect to the inverter (more on that in a bit), then a nearby strike can induce a current that will pass right through the inverter (from my rod -> inverter -> PE (N) of grid -> grid-installed rod outside).
According to inverter wiring manual (page 21/22 (bottom of page says 19/20) in attached manual), the N from the grid should not be interrupted when grid is offline (presumably to retain the grounding), but then it says to attach separate grounding to the case ("if the original protective conductor fails"). So how am I supposed to ground the outside of the inverter to something else, other than the grid N, when that would introduce a separate grounding rod I'm trying to avoid.
I'm planning on setting up a grid-tied hybrid system (48V bat + PV). I read through (among other things) the Grounding Made Simpler p1-3 (thanks a lot FilterGuy!), and the manual for the inverter I'm focusing on (Deye Hybrid 5-8kw single phase, manual attached).
A bit of background first: the grid here (somewhere in Eastern Europe) is 230v single phase. It is transported in 3phase and in a distribution box outside the house each property takes one of the phases. The distribution box has a big grounding connector stuck in the ground, and the N is grounded this way. In the end 2 wires (N and L) come in the property, where the N is grounded.
The yellow-green/PE conductor "originates" in the main house panel, where it's bonded to N, and you should install an RCD (residual current circuit breaker) on the L and N lines. It breaks the connection if it finds any current leaking from L to somewhere other than N.
Now the question: according to page 5 of Part 3 of Grounding Made Simpler series, one should avoid having a second grounding rod, because a nearby lightning can induce current between the two rods. In my case, if I stick a grounding rod around the panels to ground them, the battery, and connect to the inverter (more on that in a bit), then a nearby strike can induce a current that will pass right through the inverter (from my rod -> inverter -> PE (N) of grid -> grid-installed rod outside).
According to inverter wiring manual (page 21/22 (bottom of page says 19/20) in attached manual), the N from the grid should not be interrupted when grid is offline (presumably to retain the grounding), but then it says to attach separate grounding to the case ("if the original protective conductor fails"). So how am I supposed to ground the outside of the inverter to something else, other than the grid N, when that would introduce a separate grounding rod I'm trying to avoid.