REC
Ground frame for 10 REC Alpha Pure 2 REC420AA Pure 2 (HJT) panels (2×5)
2 rows of 5 panels, 4.20 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
- 4.20kW
- Steel
- 200.6kg
- Posts
- 8
- Bolts
- 74
- Materials
- 27,451₴
- Yield
- 4,783kWh/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 2 REC420AA Pure 2 (HJT) panel and the 2 × 5 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 60×40×2 | C-channel 60×40×2 | C-channel 60×40×2 |
| Purlins and braces | C-channel 60×40×2 | C-channel 60×40×2 | C-channel 60×40×2 |
| Frames | 4 frames, pitch up to 1,640 mm | 4 frames, pitch up to 1,640 mm | 4 frames, pitch up to 1,640 mm |
| Posts | 8 | 8 | 8 |
| Footings (bored concrete) | 8 pcs, Ø300 mm, depth 1,100 mm | 8 pcs, Ø300 mm, depth 1,100 mm | 8 pcs, Ø300 mm, depth 1,300 mm |
| Concrete | 0.68 m³ | 0.68 m³ | 0.81 m³ |
| Tilt | 30° | 30° | 30° |
| Panel bottom / post top | 600 / 1,913 mm | 600 / 1,913 mm | 600 / 1,913 mm |
| Panel field size | 5,420 × 2,455 mm | 5,420 × 2,455 mm | 5,420 × 2,455 mm |
| Row spacing between tables (no shade on 21 December) | 8,420 mm at noon · 9,460 mm ±2 h | 9,320 mm at noon · 10,770 mm ±2 h | 10,220 mm at noon · 12,150 mm ±2 h |
| Steel | 200.6 kg | 200.6 kg | 206.4 kg |
| Bolts | M10 — 50, M8 — 24 | M10 — 50, M8 — 24 | M10 — 50, M8 — 24 |
| Panel clamps | end 8, middle 16 | end 8, middle 16 | end 8, middle 16 |
| Materials | 27,451 UAH | 27,451 UAH | 28,113 UAH |
| With installation and delivery | 39,181 UAH | 39,181 UAH | 39,843 UAH |
| Per 1 kW | 9,329 UAH/kW | 9,329 UAH/kW | 9,486 UAH/kW |
| Yield | 1,266 kWh/kW · 5,319 kWh/year | 1,139 kWh/kW · 4,783 kWh/year | 1,043 kWh/kW · 4,381 kWh/year |
| Strength σ/fy | 34% | 46% | 50% |
| Deflection / (L/200) | 22% | 30% | 32% |
| Rafter strength | 48% | 66% | 71% |
| Post utilisation | 10% | 13% | 14% |
| Utilisation | 84% | 74% | 61% |
| Depth vs frost depth | ok | ok | ok |
| Checks overall | with a caution | passes | passes |
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 Ø300 × 1 100: 0.078 m³ of concrete per post. Wind uplift on the front post ≈ 8.0 kN (with γ=1.5) vs ≈ 9.5 kN (concrete weight + soil friction, estimate) → 84%.
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 | 2,131 | 4 |
| П2 | Rear post | Tube 60×60×2 | 3,038 | 4 |
| Кр1 | Rafter (inclined beam) | C-channel 60×40×2 | 3,130 | 4 |
| Пк1 | Frame strut | C-channel 60×40×2 | 1,493 | 4 |
| Х1 | Longitudinal brace (cross) | C-channel 60×40×2 | 2,090 | 4 |
| Р1 | Purlin (rail) | C-channel 60×40×2 | 5,420 | 4 |
| — | Bolt M10×25 set · purlins, braces, connectors | — | — | 2 |
| — | Bolt M10×80 set · purlin to rafter | — | — | 16 |
| — | Bolt M10×90 set · strut to post — through spacer inserts | — | — | 4 |
| — | Bolt M10×130 set · post–rafter — through spacer inserts | — | — | 16 |
| — | Bolt M10×140 set · strut to rafter — through spacer inserts | — | — | 4 |
| — | Bolt M10×150 set · brace to post — through spacer inserts | — | — | 8 |
| — | End clamp 30 mm | — | — | 8 |
| — | Mid clamp (30–40 mm) | — | — | 16 |
| — | Bolt M8×50 + channel nut | — | — | 24 |
| — | Concrete for 8 posts, Ø300×1100 | — | — | 0.68 m³ |
Profile cutting
13 bars of 6,000 mm, 69.2 m of profile in total.
- Tube 60×60×24 bars
- C-channel 60×40×29 bars
Estimated cost
The engine's materials estimate for the median zone (Cherkasy).
- Materials
- 27,451₴
- With installation and delivery
- 39,181₴
- Per 1 kW
- 9,329UAH/kW
The engine's estimate has 22 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, ≈ 4,783 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.