parts of it. Yes I read your last comment saying it could be installed after. As I said that makes sense then that the grid input could still be used as an output to cover the main panels loads..
But with the 200amp pass thru I would assume the main application of this inverter is to passthru a possible 200amps of grid power which would mean that it should be installed between the meter and the main panel.
keep in mind that most HF Inverter will not be able to start with any high surge tools or appliances.
That is exactly what is going on, and not only with the LP/EG4 inverter. L1 could be drawing 1000 watt from the grid, while L2 could be pushing 1000 watt to the grid. The meter would technically read "0" but the smart meter would see it as back feeding on L2 if the utility wants to make a point.
Think of the high pass-through as expanding the possible applications of the inverter, not as limiting it to a particular application.
Would it be possible for LuxPower to give a more aggressive fan option? My units are also >110degreesF ambient environment and if the internal temperatures are being allowed to get up to 75degreesC, I am concerned about long term life of the electrolytic capacitors. I wouldn't mind if the fans went full on at >50degreesC internal. But my units are out in the shop and noise isn't a factor for me. So an option which allowed more aggressive fan usage seems like a good mix for all. Or maybe an installer option for complete adjustment of all of the above mentioned parameters with maximums still being enforced.
I tend to look at it like we are simply supplied 240v from the electric company. thats how the meter that most people have figures out their power usage. They don’t keep track of our home usage using 120v.. this means the standard smart meter will not see backfeeding on one leg.
I guess the breaker and connection from the critical panel to the main panel isn’t needed. I suppose the inverter would supply the critical panel (thru the inverters AC output) and at the same time supply only enough power to the main panel (via the inverters AC input) until the main panel loads are satisfied, therefore doing zero export.
I looked further into this, and it looks like you are correct in some cases:
I am not sure what breaker that would be. However, someone might implement a transfer switch that allows the selection of the Inverter AC out or a direct connection to the main panel. This would be to isolate the inverter for service and would be wired such that the critical load panel could never get power from both the inverter and the main panel.
I’m sure someone “could”
I researched this heavily before I started using zero export inverters.. Short answer is that almost all meters people have on their homes only see our power usage as 240v. They only have one Ct in the meter that BOTH legs go thru. For the math the meters ALWAYS divides the amps the Ct sees in half. So if the home is only using a 240v 20amp load, the CT sees that as a 240v 40amp load because both legs go through one Ct. The meter simply divides that by .5 to get the actual 20amps at 240v being used by the home.. if the home is only using a 20amp 120v load on one leg then the meter still divides those amps by .5 which makes the meter see that load as a 240v 10amp load which is the same power as a 120v 20amp load..
if I installed one of these inverters after the main panel I would want an interlock breaker (or transfer switch) used for the Ac output and grid connection to the critical loads panel. As you said for maintenance. I would have it so the grid (bidirectional inverter AC input) always covered the loads in the critical panel unless there was a power outage then the interlock breaker or tranfer switch would allow the critical panel to be supplied by the inverters AC output..
diysolarforum.com
Some jurisdictions might require a transfer switch to bypass the inverter incase of equipment failure.
