“Draw a commercial solar PV interconnection single-line with a 250 kWdc PV array, 600 Vdc combiner and DC disconnect, 200 kWac grid-tie inverter, 480 V 400 A AC disconnect, production meter, main switchboard, and utility.”
Read the decisions behind it.
The 250 kWdc PV array lands at a 600 Vdc combiner before the DC disconnect.
A labeled 200 kWac grid-tie inverter converts the array output for the 480 V system.
Separate DC and 480 V, 400 A AC disconnects identify the isolation points on each side of the inverter.
The production meter sits between the AC disconnect and the main switchboard, which is also utility-fed.
Use this one-line for a basic commercial grid-tied PV concept. Complete designs need code-required protection, rapid shutdown, grounding, utility interconnection, and equipment-specific details.
Other examples in this family.
Common questions
Why is the PV array rated in kWdc and the inverter in kWac?
PV modules produce DC power, while the grid-tie inverter outputs AC power to the building electrical system.
What does the DC combiner do?
It combines PV source circuits into a common DC output before the DC disconnect and inverter.
Why is there a production meter?
It measures PV energy production separately from the site’s utility meter or building consumption.
Is the 400 A AC disconnect the only required protection?
No. Final protection and disconnecting means depend on code, inverter instructions, switchboard ratings, and utility requirements.