Ground plant · Zhytomyr
A 20 kW ground-mounted solar plant in Zhytomyr: 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 Zhytomyr: S₀ 1,460 Pa, W₀ 460 Pa.
- Power
- 21.08kW
- Steel
- 623.7kg
- Posts
- 22
- Bolts
- 240
- Materials
- 87,836₴
- Yield
- 23,141kWh/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 Zhytomyr.
- 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 1,460 Pa, wind W₀ 460 Pa, frost depth 1.1 m |
| Posts | Tube 60×60×2 |
| Rafters | C-channel 80×40×2 |
| Purlins and braces | C-channel 60×40×2 |
| Frames | 11 frames, pitch up to 1,920 mm |
| Posts | 22 |
| Footings (bored concrete) | 22 pcs, Ø350 mm, depth 1,200 mm |
| Concrete | 2.79 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) | 12,350 mm at noon · 14,420 mm ±2 h |
| Steel | 623.7 kg |
| Bolts | M10 — 168, M8 — 72 |
| Panel clamps | end 8, middle 64 |
| Materials | 87,836 UAH |
| With installation and delivery | 141,468 UAH |
| Per 1 kW | 6,711 UAH/kW |
| Yield | 1,098 kWh/kW · 23,141 kWh/year |
Checks and cautions
| Check | Value | Status |
|---|---|---|
| Strength σ/fy | 83% | with a caution |
| Deflection / (L/200) | 63% | passes |
| Rafter strength | 84% | with a caution |
| Post utilisation | 24% | passes |
| Utilisation | 98% | 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 1 920 mm, 11 frames. Purlin C-channel 60×40×2: strength 83%, deflection 63% of L/200 (snow on panel 939 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 84%.
- 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 Ø350 × 1 200: 0.115 m³ of concrete per post. Wind uplift on the front post ≈ 12.2 kN (with γ=1.5) vs ≈ 12.4 kN (concrete weight + soil friction, estimate) → 98%.
Bill of materials
| Mark | Part | Profile | Length, mm | Quantity |
|---|---|---|---|---|
| П1 | Front post | Tube 60×60×2 | 2,365 | 11 |
| П2 | Rear post | Tube 60×60×2 | 3,503 | 11 |
| Кр1 | Rafter (inclined beam) | C-channel 80×40×2 | 3,924 | 11 |
| Пк1 | Frame strut | C-channel 60×40×2 | 1,811 | 11 |
| Х1 | Longitudinal brace (cross) | C-channel 60×40×2 | 2,535 | 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 | — | — | 11 |
| — | Bolt M10×100 set · purlin to rafter | — | — | 44 |
| — | Bolt M10×130 set · post–rafter — through spacer inserts | — | — | 44 |
| — | Bolt M10×140 set · strut to rafter — through spacer inserts | — | — | 11 |
| — | 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 22 posts, Ø350×1200 | — | — | 2.79 m³ |
Profile cutting
41 bars of 6,000 mm, 216.7 m of profile in total.
- Tube 60×60×211 bars
- C-channel 80×40×211 bars
- C-channel 60×40×219 bars
Estimated cost
- Materials
- 87,836₴
- With installation and delivery
- 141,468₴
- Per 1 kW
- 6,711UAH/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: 1,098 kWh per 1 kW a year, ≈ 23,141 kWh a year in total for Zhytomyr (tilt 30°, the optimum for the latitude is 35.6°).
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.