Solar PV / Design guide
PV Capacity-Ratio Retrofit: DC-Side Design
Capacity ratio is the DC nameplate divided by the AC connection capacity. A ratio above one means the array can deliver more DC than the grid link carries at peak.
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Technical knowledge library
Solar PV Insights
Technical guidance for PV combiner equipment, AC collection, grid connection and project-ready solar balance-of-system decisions.
Showing 25–36 of 103 published guides.
Every guide remains available through the numbered topic pages and its own permanent article URL.
Solar PV / Protection guide
DC Arc-Fault Protection for PV: AFCI in Combiner Boxes
A DC arc in a PV system can reach thousands of degrees and ignite surrounding material within moments. Unlike AC, a DC arc does not self-extinguish at a zero crossing, so it can sustain as long as the array keeps supplying current.
Solar PV / Monitoring guide
PV O&M Monitoring and Compliance for Major Hazards
Updated safety rules treat missing monitoring, closed alarms and weak hazard control at renewable plants as major hazards, with shutdown and penalty exposure. Compliance is no longer optional.
Solar PV / Design guide
PV Plant Equipment Selection: Reliability and Economy
Large实证 platforms compare equipment under real outdoor stress so owners can choose on data rather than brochures. The consistent lesson is that the DC-side and grid-interface hardware decides both availability and lifetime cost.
Solar PV / Protection guide
PV Station Fire Safety: Full-Chain Protection
A PV array keeps supplying DC whenever light is present, so the DC side stays live even after the AC interface is open. That live wiring is the core fire-safety challenge on a roof.
Solar PV / Plant infrastructure guide
PV Step-Up Substation and Collector Line Design
A utility-scale plant splits into many sub-arrays, each feeding a collector line that gathers power toward a step-up point. The substation raises voltage for the network connection.
Solar PV / Protection guide
Rapid Shutdown for Distributed PV: Compliance and Design
A rooftop array keeps generating whenever light reaches the modules. Even after the AC side is disconnected, the DC conductors between modules and the balance of system remain energized at hundreds of volts. For firefighters and maintenance staff, that live wiring is a direct hazard during a roof incident.
Solar PV / Monitoring guide
Smart PV Combiner Box Monitoring and DC Protection
A conventional combiner box collects strings, fuses them and provides isolation. A smart combiner adds measurement and communication so the box reports its own state instead of staying silent until something fails.
Solar PV / Technical guide
PV Array Design Methodology: IEC 62548 Explained
PV array design starts from the principle that equipment must survive the worst case, not the datasheet average. The two extremes are the coldest-site voltage and the hottest-site current, both derived from module temperature coefficients.
Solar PV / Technical guide
PV DC Cable Sizing and Voltage Drop Calculation
Every metre of cable has resistance, and the current through it turns part of the solar power into heat. The drop follows one relationship: Delta U = 2 x L x I x rho(T) / S, where L is the one-way route length, I is the operating current, S is the cross-section in square millimetres, and rho is conductor resistivity, which grows with temperature.
Solar PV / Technical guide
1000V vs 1500V PV Systems: Insulation and Combiner Box Rating
Crystalline PV modules are offered in 1000 V and 1500 V system-voltage classes, set by the module insulation rating. Utility-scale arrays increasingly standardise on 1500 V to cut current and copper for the same power.
Solar PV / Technical guide
Replacing a PV Module: String Compatibility After Failure
When a module in a string fails or is discontinued, the replacement must match the original electrical characteristics. Mismatched voltage or current can push the string outside the limits the combiner box and its protection were designed for.