PV plan check

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Smart $ said:
Correction....

Current flowing from the PV back to the grid means there is no current flowing from the grid to the local system(s). Current cannot flow in both directions at the same time.
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Well, duh. :D
 
ggunn said:
Well, duh. :D
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;)

If we get technical, even my statement is incorrect. To correctly state it we must use terms reflecting power or energy transfer because AC current goes both directions by definition, just not at the same time. Current waveform timing must be opposite that of the grid to transfer energy to the grid. Using a single utility delivery system (i.e. two wires), energy can only be transferred one direction at a time.
 
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OK we may be getting off track here. My question is simply is the 200 amp panel with the 200 amp bus the end point? Meaning that does it matter what is between the solar and the main panel, wouldn't the maximum solar allowed be 40 amps? You could do 90 if you derated the main breaker to 150 amps.
 
cowboyjwc said:
OK we may be getting off track here. My question is simply is the 200 amp panel with the 200 amp bus the end point? Meaning that does it matter what is between the solar and the main panel, wouldn't the maximum solar allowed be 40 amps? You could do 90 if you derated the main breaker to 150 amps.
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Yes!
 
cowboyjwc said:
OK we may be getting off track here. My question is simply is the 200 amp panel with the 200 amp bus the end point? Meaning that does it matter what is between the solar and the main panel, wouldn't the maximum solar allowed be 40 amps? You could do 90 if you derated the main breaker to 150 amps.
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Yes to underlined. That's what a couple of us have been trying to tell you... but it appears to not have sunk in yet.
 
cowboyjwc said:
OK we may be getting off track here. My question is simply is the 200 amp panel with the 200 amp bus the end point? Meaning that does it matter what is between the solar and the main panel, wouldn't the maximum solar allowed be 40 amps? You could do 90 if you derated the main breaker to 150 amps.
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Yes. You must apply 705.12(D)(2)(3)(a, b, c, or d) to each and every panel through which the energy from the PV system can pass between the inverter(s) and the service.
 
jaggedben said:
Even if the utility allows it without extra fees and charges, which I doubt, adding another meter is a huge extra expense compared to a load side connection.

Also Cowboy mentioned batteries and if the intention is to island with solar power to when the grid goes down, that ain't gonna work if the power and loads are on separate meters.
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Good point , I missed that one.
 
Smart $ said:
Yes to underlined. That's what a couple of us have been trying to tell you... but it appears to not have sunk in yet.
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But I didn't care about what was in between, I knew that was good. I was only interested in the main service panel. A simple yes or no was all that was required.
 
cowboyjwc said:
But I didn't care about what was in between, I knew that was good. I was only interested in the main service panel. A simple yes or no was all that was required.
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You didn't tell us what was in the main service panel so a simple yes or no is out of the question. What is in the main service panel is part of what is in between.
 
cowboyjwc said:
OK we may be getting off track here. My question is simply is the 200 amp panel with the 200 amp bus the end point? Meaning that does it matter what is between the solar and the main panel, wouldn't the maximum solar allowed be 40 amps? You could do 90 if you derated the main breaker to 150 amps.
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Now this is different -- my post 29# asks the question which I thought had the end point at 400 amp buss, could you please clarify ( your end point is described as the load end of the breaker itself & does not include the feeder) -- the statement above would be correct when you attach the pv fed breaker in the enclosure which has the main OCPD & buss. You did not mention of lowering the capacity of the main OCPD that feeds the remote panel in the original statement.
Why would you need to change OCPD if it is a single main disconnect with a single load feeding a 400 amp panel?
My post though was to clarify what NEC code requires for the feeder between main OCPD & remote lug termination panel. The NEC seems to conflict with theory.
 
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The feeder is fine, because the primary and interactive sources are at opposite ends, and it is adequately protected from each source. The OP's question was about how the rules apply to the service equipment. The OP was unclear at first whether the service equipment contained a panelboard or merely a disconnecting means, but it makes no difference to the feeder.

Not sure what part of the NEC you think conflicts with theory. I don't think it does.
 
jaggedben said:
The feeder is fine, because the primary and interactive sources are at opposite ends, and it is adequately protected from each source. The OP's question was about how the rules apply to the service equipment. The OP was unclear at first whether the service equipment contained a panelboard or merely a disconnecting means, but it makes no difference to the feeder.

Not sure what part of the NEC you think conflicts with theory. I don't think it does.
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Please reply with NEC code section pertaining to this installation. I've submitted several --
 
The code sections that pertain to the installation have already been mentioned upthread.

I asked you what part of the NEC you think conflicts with theory.
 
ggunn said:
705.12(D)(2)(3)(a, b, c, and/or d) but probably not (d).
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we are stating different NEC cycles but are basically the same define - within the OP statement of this thread --

primarysource overcurrent device

overcurrent device on theload side of the power source connection
 
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