प्यानल किन्नुअघि Before choosing panels

छानामा कतिवटा सोलार प्यानल अट्छन्? How many solar panels fit on your roof?

छायाँ र अवरोध हटाएर बाँकी रहेको एउटा आयताकार भाग नाप्नुहोस्। प्यानलको datasheet मा भएको लम्बाइ, चौडाइ र वाट राखेर portrait र landscape दुवै हिसाब हेर्नुहोस्। Measure one clear rectangular roof zone after excluding shade and obstructions. Enter the exact module dimensions and watts from its datasheet to compare portrait and landscape layouts.

छानाको खाली भाग Clear roof rectangle

नाप र किनाराको खाली ठाउँ Dimensions and edge clearance

छानाको लम्बाइRoof length

छानाको चौडाइRoof width

चारैतिर छोड्ने दूरीClearance on every edge

यो दूरी अनुमान नगर्नुहोस्। installer, पहुँच, drain, parapet, छायाँ र स्थानीय नियम हेरेर राख्नुहोस्। Do not treat this as a code default. Set it from installer access, drains, parapets, shade, and applicable local requirements.

एउटा प्यानलको datasheet One panel datasheet

प्यानल लम्बाइPanel length

प्यानल चौडाइPanel width

प्यानलबीच gapGap between panels

प्यानलको नाममात्र शक्तिPanel nameplate power

अट्ने अनुमानFit estimate

बढी अट्ने प्यानलMaximum panels in one orientation 12 वटाpanels landscape, 6 × 2landscape, 6 × 2

नाममात्र DC क्षमताDC nameplate capacity5.4 kW

किनारा छोडेपछिको क्षेत्रफलArea after edge clearance28.0 m²

प्यानलले ढाक्ने क्षेत्रफलModule footprint area24.0 m²

खाली भागको coverageClear-area coverage85.6%

Portrait93 × 3

Landscape126 × 2

ध्यान दिनुहोस्Honesty note

यो समतल आयतभित्र प्यानल अट्ने प्रारम्भिक हिसाब हो। structure, wind load, mounting rail, fire access, tilt हुँदा row spacing, छायाँ, wiring र inverter sizing यसले जाँच्दैन। This is an early rectangular fit estimate. It does not check structure, wind load, mounting rails, fire access, row spacing for tilted panels, shade, wiring, or inverter sizing.

हिसाब कसरी हुन्छ?How the calculation works

पहिले चारैतिरको clearance दुई पटक घटाइन्छ। त्यसपछि gap सहित पूरा अट्ने प्यानल मात्र गनिन्छ। आधा प्यानल गनिँदैन। Clearance is removed from both ends of each roof dimension. Only complete panels that fit with the entered inter-panel gap are counted.

available length = roof length − 2 × edge clearance
available width = roof width − 2 × edge clearance
count along a side = floor((available side + gap) ÷ (panel side + gap))
portrait panels = length count × width count
landscape panels = count again after swapping panel length and width
DC capacity kW = larger panel count × panel watts ÷ 1,000

दुवै orientation मा संख्या बराबर भए portrait देखाइन्छ। छाना टुक्राटुक्रा छ भने प्रत्येक खाली आयत छुट्टै हिसाब गरेर जोड्नुहोस्। If both orientations tie, portrait is shown. For an irregular roof, calculate each clear rectangle separately and add the panel counts only after checking the real layout.

नमुना हिसाबWorked example

8 m × 5 m छानामा चारैतिर 0.5 m छोडिएको छ। Trina Solar को नमुना 450 W प्यानल 1.762 m × 1.134 m र gap 0.02 m राखिएको छ। An 8 m by 5 m roof keeps 0.5 m clear on every edge. The example uses a Trina Solar 450 W module measuring 1.762 m by 1.134 m and a 0.02 m gap.

8 − 2 × 0.5 = 7 mप्रयोग गर्न मिल्ने लम्बाइavailable length

5 − 2 × 0.5 = 4 mप्रयोग गर्न मिल्ने चौडाइavailable width

portrait = 3 × 3 = 9 panels

landscape = 6 × 2 = 12 panels

12 × 450 ÷ 1,000 = 5.4 kWनाममात्र DC क्षमताDC nameplate capacity

स्रोत र मान्यताSources and assumptions

AEPC, Grid-Connected Solar Technical Resources, checked 19 Aug 2026. AEPC provides Nepal rooftop planning and development guidance for building owners and professionals.
AEPC, Planning a Solar Project, checked 19 Aug 2026. The official package includes a rooftop planning tool and feasibility workflow.
NIST, Circumference, Area and Volume, checked 19 Aug 2026. Dimensions must use the same unit, and rectangular area is length multiplied by width.
Trina Solar Vertex S+ official datasheet, checked 19 Aug 2026. The worked example uses the listed 450 W model dimensions of 1762 × 1134 mm. Replace them with the panel you may buy.

0.5 m edge clearance र 0.02 m gap नमुना मात्र हुन्। AEPC वा Trina ले यी नम्बर सबै छानाका लागि तोकेको भनेर यो पेजले दाबी गर्दैन। The 0.5 m edge clearance and 0.02 m gap are examples only. This page does not claim AEPC or Trina prescribes them for every roof.

जडान तय गर्नुअघिBefore deciding the installation

योग्य solar designer वा structural engineer ले छानाको अवस्था, तौल, हावाको भार, anchoring, waterproofing, parapet को छायाँ, access path र electrical design जाँच्नुपर्छ। A qualified solar designer or structural engineer must check roof condition, weight, wind loading, anchors, waterproofing, parapet shade, access paths, and electrical design.