REC
Ground frame for 24 REC Alpha Pure 2 REC420AA Pure 2 (HJT) panels (2×12)
2 rows of 12 panels, 10.08 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
- 10.08kW
- Steel
- 373.1kg
- Posts
- 14
- Bolts
- 164
- Materials
- 50,592₴
- Yield
- 11,479kWh/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 × 12 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 | Tube 60×60×2 | C-channel 60×40×2 | C-channel 60×40×2 |
| Purlins and braces | C-channel 41×41×2.5 | C-channel 60×40×2 | C-channel 60×40×2 |
| Frames | 7 frames, pitch up to 2,040 mm | 7 frames, pitch up to 2,040 mm | 7 frames, pitch up to 2,040 mm |
| Posts | 14 | 14 | 14 |
| Footings (bored concrete) | 14 pcs, Ø400 mm, depth 900 mm | 14 pcs, Ø300 mm, depth 1,100 mm | 14 pcs, Ø300 mm, depth 1,300 mm |
| Concrete | 1.74 m³ | 1.20 m³ | 1.42 m³ |
| Tilt | 30° | 30° | 30° |
| Panel bottom / post top | 600 / 1,930 mm | 600 / 1,913 mm | 600 / 1,913 mm |
| Panel field size | 12,840 × 2,445 mm | 12,840 × 2,455 mm | 12,840 × 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 | 386.1 kg | 373.1 kg | 383.2 kg |
| Bolts | M10 — 112, M8 — 52 | M10 — 112, M8 — 52 | M10 — 112, M8 — 52 |
| Panel clamps | end 8, middle 44 | end 8, middle 44 | end 8, middle 44 |
| Materials | 48,013 UAH | 50,592 UAH | 51,736 UAH |
| With installation and delivery | 74,638 UAH | 76,902 UAH | 78,046 UAH |
| Per 1 kW | 7,405 UAH/kW | 7,629 UAH/kW | 7,743 UAH/kW |
| Yield | 1,266 kWh/kW · 12,766 kWh/year | 1,139 kWh/kW · 11,479 kWh/year | 1,043 kWh/kW · 10,515 kWh/year |
| Strength σ/fy | 94% | 72% | 77% |
| Deflection / (L/200) | 95% | 58% | 62% |
| Rafter strength | 39% | 82% | 88% |
| Post utilisation | 12% | 16% | 18% |
| Utilisation | 91% | 92% | 76% |
| 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.
- 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.Kherson: Frame spacing 2 040 mm, 7 frames. Purlin C-channel 41×41×2.5: strength 94%, deflection 95% of L/200 (snow on panel 489 Pa).
- 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 × 900: 0.113 m³ of concrete per post. Wind uplift on the front post ≈ 9.9 kN (with γ=1.5) vs ≈ 10.9 kN (concrete weight + soil friction, estimate) → 91%.Cherkasy: Foundation Ø300 × 1 100: 0.078 m³ of concrete per post. Wind uplift on the front post ≈ 8.7 kN (with γ=1.5) vs ≈ 9.5 kN (concrete weight + soil friction, estimate) → 92%.
- Rafter profileThe rafter is used above 80 %, or the frame's posts stand far apart: the structure passes, but the margin is small.Cherkasy: Rafter C-channel 60×40×2: span between posts 1 815, cantilever 657 mm → strength 82%.Chernihiv: Rafter C-channel 60×40×2: span between posts 1 815, cantilever 657 mm → strength 88%.
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 | 7 |
| П2 | Rear post | Tube 60×60×2 | 3,038 | 7 |
| Кр1 | Rafter (inclined beam) | C-channel 60×40×2 | 3,130 | 7 |
| Пк1 | Frame strut | C-channel 60×40×2 | 1,493 | 7 |
| Х1 | Longitudinal brace (cross) | C-channel 60×40×2 | 2,424 | 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 | 840 | 2 |
| Р6 | Purlin (rail) | C-channel 60×40×2 | 840 | 2 |
| — | Bolt M10×25 set · purlins, braces, connectors | — | — | 34 |
| — | Bolt M10×80 set · purlin to rafter | — | — | 28 |
| — | Bolt M10×90 set · strut to post — through spacer inserts | — | — | 7 |
| — | Bolt M10×120 set · post–rafter | — | — | 28 |
| — | Bolt M10×130 set · strut to rafter — through spacer inserts | — | — | 7 |
| — | Bolt M10×150 set · brace to post — through spacer inserts | — | — | 8 |
| — | End clamp 30 mm | — | — | 8 |
| — | Mid clamp (30–40 mm) | — | — | 44 |
| — | Bolt M8×50 + channel nut | — | — | 52 |
| — | Concrete for 14 posts, Ø300×1100 | — | — | 1.20 m³ |
Profile cutting
24 bars of 6,000 mm, 129.6 m of profile in total.
- Tube 60×60×27 bars
- C-channel 60×40×217 bars
Estimated cost
The engine's materials estimate for the median zone (Cherkasy).
- Materials
- 50,592₴
- With installation and delivery
- 76,902₴
- Per 1 kW
- 7,629UAH/kW
Prices are the typical market prices built into the Solispec engine, as of 06.10.2026; no margin, no VAT.
All 23 lines of the engine's estimate, with prices
| Item | Quantity | Price, UAH | Sum, UAH |
|---|---|---|---|
| Tube 60×60×2, stock length 6 000 mm | 7 bar | 210 | 8,820 |
| C-channel 60×40×2, stock length 6 000 mm | 17 bar | 230 | 23,460 |
| C-channel connector (splice plate L 300) | 8 pcs | 90 | 720 |
| Bolt M10×25 cl. 8.8 set — purlins, braces, connectors | 46 pcs | 22 | 1,012 |
| Bolt M10×80 cl. 8.8 set — purlin to rafter | 28 pcs | 27 | 756 |
| Bolt M10×90 cl. 8.8 set — strut to post — through spacer inserts | 7 pcs | 27 | 189 |
| Bolt M10×120 cl. 8.8 set — post–rafter | 28 pcs | 27 | 756 |
| Bolt M10×130 cl. 8.8 set — strut to rafter — through spacer inserts | 7 pcs | 27 | 189 |
| Bolt M10×150 cl. 8.8 set — brace to post — through spacer inserts | 8 pcs | 27 | 216 |
| End clamp 30 mm | 8 pcs | 35 | 280 |
| Mid clamp (30–40 mm) | 44 pcs | 32 | 1,408 |
| Bolt M8×50 A2 + spring channel nut M8 | 58 pcs | 14 | 812 |
| Post base anchor pin (M10 / rebar Ø12) | 14 pcs | 20 | 280 |
| Borehole casing (roofing felt / PVC, 300 mm) | 14 pcs | 60 | 840 |
| Crushed stone 20–40 for the bottom of the boreholes | 0.10 m³ | 900 | 90 |
| Earth electrode: 2 rods Ø16×1.5 m + strip 40×4 | 1 set | 1,500 | 1,500 |
| Wire PV-3 6 mm² green-yellow | 32 m | 35 | 1,120 |
| Module earthing clip (under the clamp) | 24 pcs | 20 | 480 |
| Cable clip, stainless | 72 pcs | 5 | 360 |
| Zinc paint / cold galvanising spray 400 ml | 2 pcs | 350 | 700 |
| Concrete M200 for posts | 1.20 m³ | 3,800 | 4,560 |
| Rebar Ø10 (4 bars per post) | 73 m | 28 | 2,044 |
| Spacer inserts / packs — pieces of the same profile (from offcuts): 4 × 71 mm, 7 × 70 mm, 4 × 30 mm, 7 × 10 mm | 22 pcs | 0 | 0 |
| Materials | 50,592 | ||
Yield
Yield: 1,139 kWh per 1 kW a year, ≈ 11,479 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.