Energy systems

Commercial rooftop solar has four common grid-connection arrangements. The deciding factor is the self-consumption ratio: the higher it is, the shorter the payback.

Roof condition — load capacity, usable area, orientation and shading — must be checked first. Metal and concrete roofs need different mounting systems, and structural review by the original designer may be required.

Storage capacity follows the load curve, peak/valley windows and demand-management target — not a fixed percentage of PV capacity. Oversizing lengthens payback; undersizing misses the peak-shaving target.

Battery selection should consider cycle life, degradation curve and fire protection. Thermal management and fire suppression are the core safety items for commercial and industrial storage.

A yield study states its boundary conditions: annual generation from local irradiation and system efficiency, tariff weighted by the actual consumption mix, and O&M as a fixed annual cost.

Results hold only for those assumptions — tariff policy, consumption changes and equipment degradation all move the outcome. Formal proposals list the key assumptions so you can check them.

Connection involves an application, design review, construction acceptance and commissioning with the local utility. The timeline depends on document completeness and local approval speed, so it is planned early.

Operations cover module cleaning, equipment inspection, fault response and performance monitoring. Comparing theoretical and actual generation quickly locates shading, soiling or equipment faults.