Industrial-grade solar PV electrical Single Line Diagram (SLD) and multi-sheet CAD drawing generator. Produces complete Sheet 1 Single Line Diagrams and Sheet 2 14-point statutory design verification registers with real-time reactive engineering recalculation, 20 reference archetypes, 18-point pre-flight quality control, and vector A3 PDF export.
Governing Formulas & Standards
Standards Basis: IS 3043 (India) / DEWA Shams Dubai / EMA (Singapore) / ENA G99 (UK/EU) / SEC DCS (KSA) / IEEE 1547 (USA)
V_{oc,cold} = V_{oc,STC} \cdot [1 + \gamma_{Voc} \cdot (T_{min} - 25)] \le V_{inv,max} \quad ; \quad I_{cable} = I_{sc,STC} \cdot 1.25 \cdot k_{bifacial} \cdot k_{derate}
Calculates temperature-corrected open-circuit voltage at extreme cold site ambient per IEC 62548 Cl. 7.3.1 to guarantee zero risk of inverter DC bus overvoltage, and calculates DC string cable ampacity derating with thermal correction and grouping factors.
Worked Engineering Example: 10.0 MWac Central Utility PV Plant String Sizing & Verification
- Cold Open-Circuit Voltage Check: Voc_cold = 27 × 51.2 × [1 + (-0.0028) × (2.0 - 25)] → 1472.6 Vdc ≤ 1500 Vdc (PASS, 27.4V margin)
- Hot Maximum Power Voltage Check: Vmp_hot = 27 × 42.1 × [1 + (-0.0035) × (78.0 - 25)] → 925.8 Vdc ≥ 860 Vdc (PASS, within MPPT window)
- Medium Voltage Step-Up Transformer: S_tx = 4 × 3125 kVA = 12.5 MVA @ 33 kV, %Z = 6.5% → Ik'' = 3.36 kA on 33 kV bus (PASS)
Final Solution: 14/14 Engineering Checks PASS | QA Score: 100% (Ready for Stamping)
Frequently Asked Questions
- What is the difference between Sheet 1 and Sheet 2 of the generated SLD?
- Sheet 1 is the physical electrical Single Line Diagram depicting strings, combiner boxes, inverters, LV busbars, step-up transformers, and medium-voltage switchgear. Sheet 2 is the 14-Point Statutory Design Verification Register detailing numerical parameters, mathematical limits, governing standards, and Pass/Fail compliance status.
- Can I import the generated drawings into AutoCAD or Revit?
- Yes. The tool offers clean, standalone vector SVG export formatted to standard ISO A3 Landscape dimensions, which can be directly imported into AutoCAD, Revit, SolidWorks, or Inkscape without raster pixelation.
Interactive calculation engine and real-time CAD solver available online at https://amithvijayan.in/tools/solar-pv-sld-generator.