Hold the solar one-line next to the charger plan and read the main breaker on each. A Hartford EV charger design on a shared Eversource service only works when both sheets name that same device. Eversource Connecticut will see the solar application. The City of Hartford will see the building permit. If the mains differ, the utility stalls because the application does not match the service, and the city stalls because the permit drawings do not describe one panel. Those comments will not look alike. The fix is the same. One main, copied from the equipment on the wall, onto both sets.
Shared means the photovoltaic system and the charger are fed from the same Eversource service. If the building has more than one service, both drawings name the one these systems use, including its meter. A charger on one meter and an inverter on another are not a shared service. Do not force them onto one one-line to save a sheet.
Read the service once, then copy it
Stand at the panel, or use the photos and the utility data you trust, and write three facts before you draft. Main breaker rating. Bus rating. Service size. Those three come from this equipment. A blank cell is a trip back to the photos, not a borrow from a different Hartford file.
Put the same three facts on the solar one-line and on the charger plan. If the solar connection is a breaker in this panel, both sheets show that breaker. If it is on the supply side of the main, both sheets show that connection. Neither sheet should also show the other method. One method is the design. The other is a leftover from the template.
The panel schedule is where the two trades meet. List the main, the solar point of connection, and every charger breaker you are adding. Leave the existing breakers you are not moving, so the panel is this gear and not only the new work. A schedule that shows a new breaker and a blank bus hides what both reviewers are being asked to accept.
Hartford EV charger design has to survive two reviews
Treat the two reviews as readers of one service. The Eversource Connecticut interconnection package carries the solar one-line, the inverter, and the service. The Hartford solar permit set is what the city sees for the solar work. The charger plan is what the city sees for the charging equipment. Whatever number of applications the building department is taking, the main breaker does not change between them. This article does not name a Hartford fee, a portal, or a Connecticut NEC edition. Do not add those, and do not copy an NEC year from another state's template.
Athol draws EV charger plans and the solar sheets that have to agree with them. That is design for the installer. It is not the electrician pulling conductors, and it is not a rooftop crew. If the field main is different from the drawn main, the drawings change. The crew does not get a verbal main upgrade that never hits the PDF.
Main and bus
The main breaker is the device ahead of the panel bus, at the rating printed on it. The bus is the panel rating, which is not always the same number. Write both. A charger plan that upsizes the main in a note, while the one-line still shows the old main, is the stall. If the bus was misread, correct it on the interconnection application too.
Solar backfeed
Backfeed means the solar connection into this service, drawn the way it is designed. A load-side breaker and a supply-side connection are different points. Pick one and delete the other from every sheet, including the utility application. Interconnection drawings and the city set either match or they go back to draft.
Charger nameplate
Read the charger nameplate on the unit you are submitting: voltage, number of phases, and rated current or rated load. The breaker on the panel schedule is the breaker for that nameplate, on the same main the solar one-line uses. Do not size it from a brochure that covers three models. If two chargers are on this service, each nameplate is listed under that same main. A charger that exists only in the proposal is a service the utility is not seeing.
What each reviewer is holding
Eversource is holding a solar application. The city is holding a building permit. They will not reconcile your files for you. Before upload, read the main, the meter, the inverter, the point of connection, and each charger nameplate on both. Any mismatch is a revision.
- Same main breaker rating on the solar one-line and the charger plan.
- Same bus rating and the same service size.
- Same meter, if the building has more than one.
- One solar point of connection, described the same way in both packages.
- Every charger nameplate accounted for on the panel schedule.
The EV and solar design permit problem is this comparison. A clean charger detail with the wrong main is still the wrong service. A correct solar one-line that ignores a main upgrade driven by the charger is also the wrong service. Either drawing can look internally tidy and still fail the pair.
A main change revises both packages
Chargers are often what forces the main to change. When that happens, Rev 2 is the new main, and Rev 2 has to be the revision on the solar one-line, the interconnection application, and the city plan. If the application is still the revision with the old main, do not submit the city set as the new revision. You would be asking the city to permit a service the utility has not been shown.
The revision note says the main changed because of the charger load on this service. The person updating the Eversource file may not be the person who edited the charger sheet. Permit design on a combined job includes that revision control. If the electrician later installs a different main than both PDFs, stop and reissue. The installed device becomes the next revision of both packages. There is no third main that is close enough.
Panel schedule habits that keep the pair honest
Name the panel the way the gear is named, on both the solar sheet and the charger sheet. MDP on one PDF and Main on the other will be read as two panels. A spare used for the charger is labeled as the charger breaker, not left as spare.
Do not add a demand factor, a diversity percentage, or a code edition to make the sheet look finished. If you run a load calculation, its inputs are the nameplates and the main you recorded. A factor copied from another city does not belong in the notes. Acceptance is the reviewer's letter. Your job is a pair of drawings that describe one main.
Check the file on the day you upload. A charger model change, or a solar breaker that moved to the supply side, has to hit every sheet that stated the old fact, including the application exported last week. The export Eversource will see and the export the city will see need the same main, bus, meter, and point of connection. The two reviews can still produce comments. They should not be comments about two different services.