Hey all,
So I have a scenario where I want to connect my MPP LV1012-MS to my 10 Circuit Generator Transfer Switch. This transfer switch does NOT switch Neutral. So it is designed for a generator that does NOT have a N/G bond.
I've determined (another thread and via Ian at Watts247) that my MPP unit does NOT bond N/G when Inverting from battery. That means no problem connecting it to my transfer switch (when running only on battery).
However, the thing that makes me is when I connect the AC Input to the MPP from my main panel.... So, obviously, my main panel has N/G bonded. The MPP will pass through the N/G bond when passing through the AC input to the loads. So now, in this scenario, I feel like I have (2) N/G bonds (However, both N/G bonds are in reality the same bonded location (Main Panel))
I ran this by my electrician and he felt it wasn't a problem since it wasn't "actually" two separate bonds. As a test, (to simulate the MPP in AC pass-through mode) I took an extension cord (with an adapter) and plugged right from a GFCI receptacle coming out of my main panel to the input on my transfer switch. Even with all the circuits set to Line mode on the transfer switch, the GFCI immediately tripped when plugging in. . I assume this is because the GFCI is seeing a downstream N/G bond?
So question is... Obviously, If I wire up the AC input to the MPP from the main panel, I can't go through a GFCI (trips immediately). But, if I wire direct to a breaker in the main panel, will I truly be creating a ground loop? IE: Is it unsafe?
If this won't work with my existing transfer switch, my only other options are:
Jeff
So I have a scenario where I want to connect my MPP LV1012-MS to my 10 Circuit Generator Transfer Switch. This transfer switch does NOT switch Neutral. So it is designed for a generator that does NOT have a N/G bond.
I've determined (another thread and via Ian at Watts247) that my MPP unit does NOT bond N/G when Inverting from battery. That means no problem connecting it to my transfer switch (when running only on battery).
However, the thing that makes me is when I connect the AC Input to the MPP from my main panel.... So, obviously, my main panel has N/G bonded. The MPP will pass through the N/G bond when passing through the AC input to the loads. So now, in this scenario, I feel like I have (2) N/G bonds (However, both N/G bonds are in reality the same bonded location (Main Panel))
I ran this by my electrician and he felt it wasn't a problem since it wasn't "actually" two separate bonds. As a test, (to simulate the MPP in AC pass-through mode) I took an extension cord (with an adapter) and plugged right from a GFCI receptacle coming out of my main panel to the input on my transfer switch. Even with all the circuits set to Line mode on the transfer switch, the GFCI immediately tripped when plugging in. . I assume this is because the GFCI is seeing a downstream N/G bond?
So question is... Obviously, If I wire up the AC input to the MPP from the main panel, I can't go through a GFCI (trips immediately). But, if I wire direct to a breaker in the main panel, will I truly be creating a ground loop? IE: Is it unsafe?
If this won't work with my existing transfer switch, my only other options are:
- Pull circuits out to a "critical load" panel and tie the neutrals together on my MPP unit (instructed by Ian to force the N/G bond on battery)
- Pull circuits out to a transfer switch that does transfer Neutral (still have to force the N/G bond on the MPP unit)
Jeff