Ground plant · Lutsk
A 20 kW ground-mounted solar plant in Lutsk: structure, materials, cost
34 Ulica UL-620M-132DDGN (dual glass bifacial) panels (21.08 kW) on 1 table of 2 × 17. Snow and wind per the DBN for Lutsk: S₀ 1,240 Pa, W₀ 480 Pa.
- Power
- 21.08kW
- Steel
- 589.7kg
- Posts
- 20
- Bolts
- 230
- Materials
- 86,208₴
- Yield
- 22,661kWh/year
Ground frame designer
Design the 20 kW plant in the builder
Opens the 2 × 17 table with the Ulica UL-620M-132DDGN (dual glass bifacial) panel and the loads for Lutsk.
- No sign-up
- Snow and wind check
- Drawings and estimate
Panel
Ulica UL-620M-132DDGN (dual glass bifacial): 620 W, 2,382 × 1,134 mm, portrait.
The table's structure
| Layout | 1 table, each 2 × 17 = 34 panels |
|---|---|
| Loads (DBN V.1.2-2:2006) | snow S₀ 1,240 Pa, wind W₀ 480 Pa, frost depth 0.9 m |
| Posts | Tube 60×60×2 |
| Rafters | C-channel 80×40×2 |
| Purlins and braces | C-channel 60×40×2 |
| Frames | 10 frames, pitch up to 2,120 mm |
| Posts | 20 |
| Footings (bored concrete) | 20 pcs, Ø400 mm, depth 1,200 mm |
| Concrete | 3.32 m³ |
| Tilt | 30° |
| Panel bottom / post top | 600 / 2,278 mm |
| Panel field size | 19,738 × 3,107 mm |
| Row spacing between tables (no shade on 21 December) | 12,620 mm at noon · 14,840 mm ±2 h |
| Steel | 589.7 kg |
| Bolts | M10 — 158, M8 — 72 |
| Panel clamps | end 8, middle 64 |
| Materials | 86,208 UAH |
| With installation and delivery | 139,868 UAH |
| Per 1 kW | 6,635 UAH/kW |
| Yield | 1,075 kWh/kW · 22,661 kWh/year |
Checks and cautions
| Check | Value | Status |
|---|---|---|
| Strength σ/fy | 94% | with a caution |
| Deflection / (L/200) | 78% | passes |
| Rafter strength | 86% | with a caution |
| Post utilisation | 25% | passes |
| Utilisation | 96% | with a caution |
| Depth vs frost depth | ok | passes |
- Max. frame pitch, mmThe purlins between the frames are used above 80 % (strength or deflection): the structure passes, but the margin is small. A shorter frame pitch or a deeper purlin gives more margin.Frame spacing 2 120 mm, 10 frames. Purlin C-channel 60×40×2: strength 94%, deflection 78% of L/200 (snow on panel 797 Pa).
- Rafter profileThe rafter is used above 80 %, or the frame's posts stand far apart: the structure passes, but the margin is small.Rafter C-channel 80×40×2: span between posts 2 276, cantilever 824 mm → strength 86%.
- Embedment, mmThe footing resists wind uplift at above 80 % utilisation, or it is shallower than the frost depth. The soil resistance in the calculation is an estimate — check the soil on site.Foundation Ø400 × 1 200: 0.151 m³ of concrete per post. Wind uplift on the front post ≈ 14.0 kN (with γ=1.5) vs ≈ 14.6 kN (concrete weight + soil friction, estimate) → 96%.
Bill of materials
| Mark | Part | Profile | Length, mm | Quantity |
|---|---|---|---|---|
| П1 | Front post | Tube 60×60×2 | 2,365 | 10 |
| П2 | Rear post | Tube 60×60×2 | 3,503 | 10 |
| Кр1 | Rafter (inclined beam) | C-channel 80×40×2 | 3,924 | 10 |
| Пк1 | Frame strut | C-channel 60×40×2 | 1,811 | 10 |
| Х1 | Longitudinal brace (cross) | C-channel 60×40×2 | 2,693 | 4 |
| Р1 | Purlin (rail) | C-channel 60×40×2 | 6,000 | 2 |
| Р2 | Purlin (rail) | C-channel 60×40×2 | 6,000 | 2 |
| Р3 | Purlin (rail) | C-channel 60×40×2 | 6,000 | 2 |
| Р4 | Purlin (rail) | C-channel 60×40×2 | 6,000 | 2 |
| Р5 | Purlin (rail) | C-channel 60×40×2 | 6,000 | 2 |
| Р6 | Purlin (rail) | C-channel 60×40×2 | 6,000 | 2 |
| Р7 | Purlin (rail) | C-channel 60×40×2 | 1,738 | 2 |
| Р8 | Purlin (rail) | C-channel 60×40×2 | 1,738 | 2 |
| — | Bolt M10×25 set · purlins, braces, connectors | — | — | 50 |
| — | Bolt M10×90 set · strut to post — through spacer inserts | — | — | 10 |
| — | Bolt M10×100 set · purlin to rafter | — | — | 40 |
| — | Bolt M10×130 set · post–rafter — through spacer inserts | — | — | 40 |
| — | Bolt M10×140 set · strut to rafter — through spacer inserts | — | — | 10 |
| — | Bolt M10×150 set · brace to post — through spacer inserts | — | — | 8 |
| — | End clamp 30 mm | — | — | 8 |
| — | Mid clamp (30–40 mm) | — | — | 64 |
| — | Bolt M8×50 + channel nut | — | — | 72 |
| — | Concrete for 20 posts, Ø400×1200 | — | — | 3.32 m³ |
Profile cutting
39 bars of 6,000 mm, 205.8 m of profile in total.
- Tube 60×60×210 bars
- C-channel 80×40×210 bars
- C-channel 60×40×219 bars
Estimated cost
- Materials
- 86,208₴
- With installation and delivery
- 139,868₴
- Per 1 kW
- 6,635UAH/kW
The engine's estimate has 24 lines; the full list is in the builder. Prices are the typical market prices built into the Solispec engine, as of 06.10.2026; no margin, no VAT.
Yield
Yield: 1,075 kWh per 1 kW a year, ≈ 22,661 kWh a year in total for Lutsk (tilt 30°, the optimum for the latitude is 35.8°).
A preliminary calculation; a design needs an engineer's check. Snow and wind per DBN V.1.2-2:2006 for the regional centre; profiles, footings and estimate by the Solispec engine 0.12.0.