I dealing with a solar grid tie system here
The explanation on the links isn't too clear. they state that during the daytime you will have current from both the power company and from the solar array across the bus bar. I would have to ask if this has been tested.
If my array lets say 5KW 240 volt is generating full power at noon and lets say 10.6 amps across the 2 hot bars. That power is first going to feed the devices in the house and any excess would be pushed out to the grid. The dependancy on the grid has been reduced.
How can you have both and over power the bus bar ? Even if its early in the morning or late in the evening most of the load is covered by the power company but as in my situation by mid day I'm pushing almost 16 amps back to the grid and the remainder of the 21 amps ( 5 amps ) is taking care of the phantom loads in the house. Nothing is being taken from the Grid power system.
The requirement is that on a "dwelling unit"
the sum of circuit breakers feeding current to a conductor or busbar cannot exceed 120% of the rating of the busbar [NEC 690.64(B)(2) Exception]. What this means is that on a typical 200A residential service the maximum sum of breakers is 240A. If the main breaker for the service panel is 200A that leave a maximum of 40A for for?grid-tie Inverters
The explanation on the links isn't too clear. they state that during the daytime you will have current from both the power company and from the solar array across the bus bar. I would have to ask if this has been tested.
If my array lets say 5KW 240 volt is generating full power at noon and lets say 10.6 amps across the 2 hot bars. That power is first going to feed the devices in the house and any excess would be pushed out to the grid. The dependancy on the grid has been reduced.
How can you have both and over power the bus bar ? Even if its early in the morning or late in the evening most of the load is covered by the power company but as in my situation by mid day I'm pushing almost 16 amps back to the grid and the remainder of the 21 amps ( 5 amps ) is taking care of the phantom loads in the house. Nothing is being taken from the Grid power system.
The requirement is that on a "dwelling unit"
the sum of circuit breakers feeding current to a conductor or busbar cannot exceed 120% of the rating of the busbar [NEC 690.64(B)(2) Exception]. What this means is that on a typical 200A residential service the maximum sum of breakers is 240A. If the main breaker for the service panel is 200A that leave a maximum of 40A for for?grid-tie Inverters