The AC-side connection is the backbone of any rooftop solar PV system, ensuring that clean energy generated on the roof is safely delivered to building loads and the utility grid. This diagram clearly illustrates the complete AC power flow—from the inverter’s AC output on the rooftop to the main distribution board, energy meter, and earthing system.
Once DC power is converted to AC by the inverter, it is routed through a dedicated AC cable, typically marked in ISA orange for easy identification of solar circuits. Proper cable routing from the rooftop to the DB room is essential to prevent mechanical damage, reduce fire risk, and minimize voltage losses.
At the main distribution board, critical protection devices such as MCBs, RCCBs, SPDs, and AC isolators are installed. These components safeguard the system against overcurrent, earth leakage, and surge events while allowing safe isolation during maintenance. Checking the capacity and compatibility of existing electrical infrastructure is a crucial step before solar integration.
The energy or net meter plays a key role by accurately measuring imported and exported energy, enabling net metering benefits and transparent billing. A well-integrated metering system ensures regulatory compliance and helps track system performance.
Finally, a dedicated earthing and ground path connects the inverter, DB, and surge protection devices to an earthing pit. This grounding system protects equipment, improves safety, and ensures reliable operation under fault conditions.
A well-designed AC-side integration enhances safety, efficiency, and long-term reliability of rooftop solar installations. Read more