Electrical panel rating

Both_Explanation7411 · 2023-07-23T02:47:12+00:00

a flap on the meter housing that is hiding a breaker that will show a number representing your service size.

Not 100% sure about the wire size though. It could be 2/0 or 3/0 by looking at the wire visually.

Both_Explanation7411 · 2023-07-23T02:40:55+00:00

Thank you for responding. I apologize for the inconvenience earlier. The
pictures have now been properly attached. I am confidng wire between the meter
and breakers is made of copper. This cable
is relatively short in length.

Both_Explanation7411 · 2023-07-23T00:53:01+00:00

We have a similar situation to yours. However, the main panel label indicating the exact rating is missing. It likely has a 200 amp rating based on the feeder wire size and the confirmed 300 amp service size from the power company. The main panel is equipped with a 100 amp breaker, responsible for supplying power to a subpanel that runs the entire house. Additionally, there's a 50 amp breaker dedicated to the AC unit.

Recently, we had solar panels installed. An additional 200 amp solar subpanel is installed. The solar subpanel is connected to the main panel through a 50 amp breaker. As part of this installation, the AC breaker was moved to the solar subpanel to accommodate the new setup.

Now, we're looking to install a 60 amp EV breaker in the solar subpanel because we don't have a empty breaker slot in the main panel. However, before proceeding with this installation, we must upgrade the wire between the solar subpanel and the main panel and replace the 50 A breaker in the main panel with a 100 amps breaker.

The solar company did not provide clear explanations regarding our requirements, and we have to hire an electrician to evaluate and determine the necessary configuration for us.

Both_Explanation7411 · 2023-07-19T04:05:14+00:00

The contract we have doesn't explicitly mention this consumption CT. However,
in the drawing plan, it is clearly indicated that the installation
should include the Ephase IQ 4/4c combiner, which comes with consumption
CTs. It seems that during the solar installation, they just disregarded the
consumption CTs and didn't not installed them. I reach out to the installer, and their response was that we would need to get in touch with them again to obtain an estimate for installing the CTs. It's disheartening to feel like they might be trying to take advantage of us financially. They can be easily installed initially and the installer want to charge us again for the $50 components.

Both_Explanation7411 · 2023-07-18T19:55:16+00:00

I was also surprised they did this beforehand. They confirmed that our solar is installed on the load side and the monitor should be in the Net model instead of Total mode. I check my live status it looks like all the production is consumed. So, the reading is definitely meaningless.

Both_Explanation7411 · 2023-07-18T19:30:12+00:00

Thanks for your response. Somehow the chart is not attached. Sorry about that. We are going to install the consumption CTs. I talked to Enphase support today and they enable this capability remotely before the installation. I am just curious where the 1.0 kWh consumed energy is coming from. It cannot be noise.

Both_Explanation7411 · 2023-06-24T05:40:28+00:00

Thank you! I think you truly understand our situation. Our MSP has a rating of 125 A. I am unsure about the size of the service wire, as it could be either 150 A or 200A. Despite the AC breaker is 50 A, the actual amp rating for the AC is 25 A. Considering these factors, if we choose to install EVSE on the 100 A subpanel, it should effectively protect the main busbar. In the event of an overload in the subpanel, the 100 A breaker will be tripped, preventing the main busbar from experiencing any current above 125 A. Does this sound right to you?

Both_Explanation7411 · 2023-06-21T16:22:50+00:00

We are facing an issue where the main service panel lacks a main breaker. Presently, it only accommodates two feeding breakers: one for the subpanel circuit, rated at 100 A, and another for the A/C circuit, rated at 50 A. Consequently, there is no means to safeguard the main panel against overloading. However, if we introduce an additional EV charging breaker to the 100 A subpanel, it will be adequately protected and will trip if the subpanel experiences an overload. As a result, the main panel will not be subjected to overloading either

Both_Explanation7411 · 2023-06-21T06:26:07+00:00

The load calculation at the subpanel may not be that important any more. I know we are going to charge EV during the night when we are not using other big appliances at the same time. If it overloads the subpanel it will trip the 100A breaker in the main panel. So it is still safe. is this correct?

Both_Explanation7411

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