REC
Ground frame for 60 REC Alpha Pure-RX REC470AA Pure-RX (HJT) panels (3×20)
3 rows of 20 panels, 28.20 kW. The Solispec engine chose the profiles, the frame pitch and the footings for three snow and wind zones: Kherson has the lowest load of the regional centres, Cherkasy the median, Chernihiv the highest.
- Power
- 28.20kW
- Steel
- 996.7kg
- Posts
- 22
- Bolts
- 386
- Materials
- 140,319₴
- Yield
- 32,114kWh/year
Figures for the median zone (Cherkasy); all three zones are in the table below.
Ground frame designer
Open this frame in the builder
The builder opens with the REC Alpha Pure-RX REC470AA Pure-RX (HJT) panel and the 3 × 20 layout; site — Cherkasy. Change the site, the tilt or the profiles and the checks and estimate are recalculated.
- No sign-up
- Snow and wind check
- Drawings and estimate
Three snow and wind zones
The same table designed for three regional centres: with the lowest, the median and the highest combined snow and wind load under DBN V.1.2-2:2006. For another site, open the frame in the builder.
| Parameter | Low loadKherson · S₀ 760 · W₀ 480 | Median loadCherkasy · S₀ 1,520 · W₀ 420 | High loadChernihiv · S₀ 1,720 · W₀ 410 |
|---|---|---|---|
| Posts | Tube 60×60×2 | Tube 60×60×2 | Tube 60×60×2 |
| Rafters | C-channel 80×40×2 | C-channel 100×50×2.5 | C-channel 100×50×2.5 |
| Purlins and braces | C-channel 41×41×2.5 | C-channel 60×40×2 | C-channel 60×40×2 |
| Frames | 15 frames, pitch up to 1,720 mm | 11 frames, pitch up to 2,390 mm | 12 frames, pitch up to 2,180 mm |
| Posts | 30 | 22 | 24 |
| Footings (bored concrete) | 30 pcs, Ø400 mm, depth 1,100 mm | 22 pcs, Ø400 mm, depth 1,300 mm | 24 pcs, Ø350 mm, depth 1,500 mm |
| Concrete | 4.56 m³ | 3.95 m³ | 3.81 m³ |
| Tilt | 30° | 30° | 30° |
| Panel bottom / post top | 600 / 2,512 mm | 600 / 2,487 mm | 600 / 2,487 mm |
| Panel field size | 24,620 × 3,474 mm | 24,620 × 3,488 mm | 24,620 × 3,488 mm |
| Row spacing between tables (no shade on 21 December) | 11,720 mm at noon · 13,180 mm ±2 h | 12,990 mm at noon · 15,000 mm ±2 h | 14,240 mm at noon · 16,920 mm ±2 h |
| Steel | 1,087.7 kg | 996.7 kg | 1,065.1 kg |
| Bolts | M10 — 316, M8 — 126 | M10 — 260, M8 — 126 | M10 — 274, M8 — 126 |
| Panel clamps | end 12, middle 114 | end 12, middle 114 | end 12, middle 114 |
| Materials | 140,243 UAH | 140,319 UAH | 146,205 UAH |
| With installation and delivery | 211,218 UAH | 211,586 UAH | 217,385 UAH |
| Per 1 kW | 7,490 UAH/kW | 7,503 UAH/kW | 7,709 UAH/kW |
| Yield | 1,266 kWh/kW · 35,713 kWh/year | 1,139 kWh/kW · 32,114 kWh/year | 1,043 kWh/kW · 29,416 kWh/year |
| Strength σ/fy | 64% | 94% | 84% |
| Deflection / (L/200) | 55% | 88% | 72% |
| Rafter strength | 79% | 75% | 74% |
| Post utilisation | 20% | 36% | 36% |
| Utilisation | 95% | 98% | 89% |
| Depth vs frost depth | ok | ok | ok |
| Checks overall | with a caution | with a caution | with a caution |
Checks and cautions
Member utilisation as the engine computes it. Cautions are checks that pass, but with a small margin.
- 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.Kherson: Foundation Ø400 × 1 100: 0.138 m³ of concrete per post. Wind uplift on the front post ≈ 12.7 kN (with γ=1.5) vs ≈ 13.4 kN (concrete weight + soil friction, estimate) → 95%.Cherkasy: Foundation Ø400 × 1 300: 0.163 m³ of concrete per post. Wind uplift on the front post ≈ 15.5 kN (with γ=1.5) vs ≈ 15.8 kN (concrete weight + soil friction, estimate) → 98%.Chernihiv: Foundation Ø350 × 1 500: 0.144 m³ of concrete per post. Wind uplift on the front post ≈ 13.8 kN (with γ=1.5) vs ≈ 15.5 kN (concrete weight + soil friction, estimate) → 89%.
- 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.Cherkasy: Frame spacing 2 390 mm, 11 frames. Purlin C-channel 60×40×2: strength 94%, deflection 88% of L/200 (snow on panel 977 Pa).Chernihiv: Frame spacing 2 180 mm, 12 frames. Purlin C-channel 60×40×2: strength 84%, deflection 72% of L/200 (snow on panel 1 106 Pa).
Bill of materials
The parts of one table for the median zone (Cherkasy): mark, name, profile, cut length, quantity.
| Mark | Part | Profile | Length, mm | Quantity |
|---|---|---|---|---|
| П1 | Front post | Tube 60×60×2 | 2,459 | 11 |
| П2 | Rear post | Tube 60×60×2 | 3,812 | 11 |
| Кр1 | Rafter (inclined beam) | C-channel 100×50×2.5 | 4,664 | 11 |
| Пк1 | Frame strut | C-channel 60×40×2 | 2,001 | 11 |
| Пк2 | Front frame strut | C-channel 60×40×2 | 2,637 | 11 |
| Х1 | Longitudinal brace (cross) | C-channel 60×40×2 | 3,034 | 4 |
| Р1 | Purlin (rail) | C-channel 60×40×2 | 6,000 | 3 |
| Р2 | Purlin (rail) | C-channel 60×40×2 | 6,000 | 3 |
| Р3 | Purlin (rail) | C-channel 60×40×2 | 6,000 | 3 |
| Р4 | Purlin (rail) | C-channel 60×40×2 | 6,000 | 3 |
| Р5 | Purlin (rail) | C-channel 60×40×2 | 6,000 | 3 |
| Р6 | Purlin (rail) | C-channel 60×40×2 | 6,000 | 3 |
| Р7 | Purlin (rail) | C-channel 60×40×2 | 6,000 | 3 |
| Р8 | Purlin (rail) | C-channel 60×40×2 | 6,000 | 3 |
| Р9 | Purlin (rail) | C-channel 60×40×2 | 620 | 3 |
| Р10 | Purlin (rail) | C-channel 60×40×2 | 620 | 3 |
| — | Bolt M10×80 / M10×25 set · frame and struts / purlins, braces, connectors | — | — | 109 |
| — | Bolt M10×90 set · strut to post — through spacer inserts | — | — | 11 |
| — | Bolt M10×120 set · purlin to rafter | — | — | 66 |
| — | Bolt M10×130 set · post–rafter, strut to post — through spacer inserts | — | — | 55 |
| — | 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 | — | — | 12 |
| — | Mid clamp (30–40 mm) | — | — | 114 |
| — | Bolt M8×50 + channel nut | — | — | 126 |
| — | Concrete for 22 posts, Ø400×1300 | — | — | 3.95 m³ |
Profile cutting
65 bars of 6,000 mm, 331.2 m of profile in total.
- Tube 60×60×217 bars
- C-channel 100×50×2.511 bars
- C-channel 60×40×237 bars
Estimated cost
The engine's materials estimate for the median zone (Cherkasy).
- Materials
- 140,319₴
- With installation and delivery
- 211,586₴
- Per 1 kW
- 7,503UAH/kW
The engine's estimate has 25 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: 1,139 kWh per 1 kW a year, ≈ 32,114 kWh a year in total (median zone, Cherkasy; tilt 30°, the optimum for the latitude is 35.3°).
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.