REC
Ground frame for 40 REC Alpha Pure 2 REC420AA Pure 2 (HJT) panels (2×20)
2 rows of 20 panels, 16.80 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
- 16.80kW
- Steel
- 569.9kg
- Posts
- 20
- Bolts
- 242
- Materials
- 76,299₴
- Yield
- 19,132kWh/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 × 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 | 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 | 12 frames, pitch up to 1,890 mm | 10 frames, pitch up to 2,290 mm | 10 frames, pitch up to 2,290 mm |
| Posts | 24 | 20 | 20 |
| Footings (bored concrete) | 24 pcs, Ø350 mm, depth 900 mm | 20 pcs, Ø300 mm, depth 1,300 mm | 20 pcs, Ø300 mm, depth 1,300 mm |
| Concrete | 2.29 m³ | 2.02 m³ | 2.02 m³ |
| Tilt | 30° | 30° | 30° |
| Panel bottom / post top | 600 / 1,930 mm | 600 / 1,913 mm | 600 / 1,913 mm |
| Panel field size | 21,320 × 2,445 mm | 21,320 × 2,455 mm | 21,320 × 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 | 635.3 kg | 569.9 kg | 569.9 kg |
| Bolts | M10 — 178, M8 — 84 | M10 — 158, M8 — 84 | M10 — 158, M8 — 84 |
| Panel clamps | end 8, middle 76 | end 8, middle 76 | end 8, middle 76 |
| Materials | 73,198 UAH | 76,299 UAH | 76,299 UAH |
| With installation and delivery | 116,620 UAH | 119,259 UAH | 119,259 UAH |
| Per 1 kW | 6,942 UAH/kW | 7,099 UAH/kW | 7,099 UAH/kW |
| Yield | 1,266 kWh/kW · 21,276 kWh/year | 1,139 kWh/kW · 19,132 kWh/year | 1,043 kWh/kW · 17,525 kWh/year |
| Strength σ/fy | 81% | 91% | 97% |
| Deflection / (L/200) | 76% | 81% | 88% |
| Rafter strength | 36% | 92% | 98% |
| Post utilisation | 11% | 18% | 20% |
| Utilisation | 99% | 87% | 85% |
| 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 1 890 mm, 12 frames. Purlin C-channel 41×41×2.5: strength 81%, deflection 76% of L/200 (snow on panel 489 Pa).Cherkasy: Frame spacing 2 290 mm, 10 frames. Purlin C-channel 60×40×2: strength 91%, deflection 81% of L/200 (snow on panel 977 Pa).Chernihiv: Frame spacing 2 290 mm, 10 frames. Purlin C-channel 60×40×2: strength 97%, deflection 88% of L/200 (snow on panel 1 106 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 Ø350 × 900: 0.087 m³ of concrete per post. Wind uplift on the front post ≈ 9.2 kN (with γ=1.5) vs ≈ 9.3 kN (concrete weight + soil friction, estimate) → 99%.Cherkasy: Foundation Ø300 × 1 300: 0.092 m³ of concrete per post. Wind uplift on the front post ≈ 9.7 kN (with γ=1.5) vs ≈ 11.2 kN (concrete weight + soil friction, estimate) → 87%.Chernihiv: Foundation Ø300 × 1 300: 0.092 m³ of concrete per post. Wind uplift on the front post ≈ 9.5 kN (with γ=1.5) vs ≈ 11.2 kN (concrete weight + soil friction, estimate) → 85%.
- 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 92%.Chernihiv: Rafter C-channel 60×40×2: span between posts 1 815, cantilever 657 mm → strength 98%.
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 | 2,331 | 10 |
| П2 | Rear post | Tube 60×60×2 | 3,238 | 10 |
| Кр1 | Rafter (inclined beam) | C-channel 60×40×2 | 3,130 | 10 |
| Пк1 | Frame strut | C-channel 60×40×2 | 1,493 | 10 |
| Х1 | Longitudinal brace (cross) | C-channel 60×40×2 | 2,642 | 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 | 3,320 | 2 |
| Р8 | Purlin (rail) | C-channel 60×40×2 | 3,320 | 2 |
| — | Bolt M10×25 set · purlins, braces, connectors | — | — | 50 |
| — | Bolt M10×80 set · purlin to rafter | — | — | 40 |
| — | Bolt M10×90 set · strut to post — through spacer inserts | — | — | 10 |
| — | Bolt M10×120 set · post–rafter | — | — | 40 |
| — | Bolt M10×130 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) | — | — | 76 |
| — | Bolt M8×50 + channel nut | — | — | 84 |
| — | Concrete for 20 posts, Ø300×1300 | — | — | 2.02 m³ |
Profile cutting
36 bars of 6,000 mm, 197.8 m of profile in total.
- Tube 60×60×210 bars
- C-channel 60×40×226 bars
Estimated cost
The engine's materials estimate for the median zone (Cherkasy).
- Materials
- 76,299₴
- With installation and delivery
- 119,259₴
- Per 1 kW
- 7,099UAH/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 | 10 bar | 210 | 12,600 |
| C-channel 60×40×2, stock length 6 000 mm | 26 bar | 230 | 35,880 |
| C-channel connector (splice plate L 300) | 12 pcs | 90 | 1,080 |
| Bolt M10×25 cl. 8.8 set — purlins, braces, connectors | 66 pcs | 22 | 1,452 |
| Bolt M10×80 cl. 8.8 set — purlin to rafter | 40 pcs | 27 | 1,080 |
| Bolt M10×90 cl. 8.8 set — strut to post — through spacer inserts | 10 pcs | 27 | 270 |
| Bolt M10×120 cl. 8.8 set — post–rafter | 40 pcs | 27 | 1,080 |
| Bolt M10×130 cl. 8.8 set — strut to rafter — through spacer inserts | 10 pcs | 27 | 270 |
| 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) | 76 pcs | 32 | 2,432 |
| Bolt M8×50 A2 + spring channel nut M8 | 93 pcs | 14 | 1,302 |
| Post base anchor pin (M10 / rebar Ø12) | 20 pcs | 20 | 400 |
| Borehole casing (roofing felt / PVC, 300 mm) | 20 pcs | 60 | 1,200 |
| Crushed stone 20–40 for the bottom of the boreholes | 0.14 m³ | 900 | 126 |
| Earth electrode: 2 rods Ø16×1.5 m + strip 40×4 | 1 set | 1,500 | 1,500 |
| Wire PV-3 6 mm² green-yellow | 47 m | 35 | 1,645 |
| Module earthing clip (under the clamp) | 40 pcs | 20 | 800 |
| Cable clip, stainless | 120 pcs | 5 | 600 |
| Zinc paint / cold galvanising spray 400 ml | 3 pcs | 350 | 1,050 |
| Concrete M200 for posts | 2.02 m³ | 3,800 | 7,676 |
| Rebar Ø10 (4 bars per post) | 120 m | 28 | 3,360 |
| Spacer inserts / packs — pieces of the same profile (from offcuts): 4 × 71 mm, 10 × 70 mm, 4 × 30 mm, 10 × 10 mm | 28 pcs | 0 | 0 |
| Materials | 76,299 | ||
Yield
Yield: 1,139 kWh per 1 kW a year, ≈ 19,132 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.