REC
Ground frame for 40 REC Alpha Pro MG REC610AA Pro MG (HJT, bifacial) panels (4×10)
4 rows of 10 panels, 24.40 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
- 24.40kW
- Steel
- 1,298.9kg
- Posts
- 21
- Bolts
- 316
- Materials
- 176,581₴
- Yield
- 27,786kWh/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 Pro MG REC610AA Pro MG (HJT, bifacial) panel and the 4 × 10 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 80×80×3 | Tube 80×80×3 | Tube 80×80×3 |
| Rafters | Tube 60×60×2 | 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 41×41×2.5 |
| Frames | 10 frames, pitch up to 1,440 mm | 7 frames, pitch up to 2,120 mm | 10 frames, pitch up to 1,440 mm |
| Posts | 30 | 21 | 30 |
| Footings (bored concrete) | 30 pcs, Ø450 mm, depth 1,500 mm | 21 pcs, Ø500 mm, depth 1,700 mm | 30 pcs, Ø400 mm, depth 1,500 mm |
| Concrete | 7.87 m³ | 7.71 m³ | 6.22 m³ |
| Tilt | 30° | 30° | 30° |
| Panel bottom / post top | 600 / 4,149 mm | 600 / 4,115 mm | 600 / 4,131 mm |
| Panel field size | 13,370 × 6,288 mm | 13,370 × 6,308 mm | 13,370 × 6,298 mm |
| Row spacing between tables (no shade on 21 December) | 19,650 mm at noon · 22,090 mm ±2 h | 21,780 mm at noon · 25,150 mm ±2 h | 23,870 mm at noon · 28,370 mm ±2 h |
| Steel | 1,657.1 kg | 1,298.9 kg | 1,677.2 kg |
| Bolts | M10 — 294, M8 — 88 | M10 — 228, M8 — 88 | M10 — 294, M8 — 88 |
| Panel clamps | end 16, middle 72 | end 16, middle 72 | end 16, middle 72 |
| Materials | 182,345 UAH | 176,581 UAH | 197,345 UAH |
| With installation and delivery | 244,827 UAH | 238,446 UAH | 258,867 UAH |
| Per 1 kW | 10,034 UAH/kW | 9,772 UAH/kW | 10,609 UAH/kW |
| Yield | 1,266 kWh/kW · 30,901 kWh/year | 1,139 kWh/kW · 27,786 kWh/year | 1,043 kWh/kW · 25,452 kWh/year |
| Strength σ/fy | 61% | 97% | 86% |
| Deflection / (L/200) | 44% | 81% | 61% |
| Rafter strength | 95% | 98% | 71% |
| Post utilisation | 20% | 39% | 28% |
| Post utilisation П3 | 6% | 12% | 9% |
| Utilisation | 97% | 97% | 96% |
| Depth vs frost depth | ok | ok | ok |
| Bolt utilisation | 27% | 66% | 48% |
| Plate section | 11% | 11% | 8% |
| Not included | engineer to check | engineer to check | engineer to check |
| 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.
- Rafter profileThe rafter is used above 80 %, or the frame's posts stand far apart: the structure passes, but the margin is small.Kherson: Rafter · Tube 60×60×2 · 3 posts, spans between posts 2 840 mm, cantilever 1 160 mm — continuous beam on 3 supports → strength 95%.Cherkasy: Rafter · C-channel 100×50×2.5 · 3 posts, spans between posts 2 840 mm, cantilever 1 160 mm — continuous beam on 3 supports → strength 98%.
- 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 Ø450 × 1 500: 0.239 m³ of concrete per post. Wind uplift on the front post ≈ 20.5 kN (with γ=1.5) vs ≈ 21.1 kN (concrete weight + soil friction, estimate) → 97%.Cherkasy: Foundation Ø500 × 1 700: 0.334 m³ of concrete per post. Wind uplift on the front post ≈ 26.4 kN (with γ=1.5) vs ≈ 27.2 kN (concrete weight + soil friction, estimate) → 97%.Chernihiv: Foundation Ø400 × 1 500: 0.188 m³ of concrete per post. Wind uplift on the front post ≈ 17.5 kN (with γ=1.5) vs ≈ 18.2 kN (concrete weight + soil friction, estimate) → 96%.
- Stock length, mmKherson: Rafter 8 000 mm is longer than the 6 000 mm stock length — 2 pieces: Кр1а 3 300, Кр1б 4 700 mm. Splice — plate Н1 L 300 mm of the same profile, back to back, 2+2 bolts M10 cl. 8.8, at 3 300 mm from the lower end of the rafter, where the moment is small. Bolt: 6.09 kN vs 22.27 kN (27%), plate 11%. Rafter splice — engineer to check: the plate's eccentricity, the C-channel's torsion and the axial force are not included.Cherkasy: Rafter 8 000 mm is longer than the 6 000 mm stock length — 2 pieces: Кр1а 3 300, Кр1б 4 700 mm. Splice — plate Н1 L 300 mm of the same profile, back to back, 2+2 bolts M10 cl. 8.8, at 3 300 mm from the lower end of the rafter, where the moment is small. Bolt: 11.84 kN vs 18.00 kN (66%), plate 11%. Rafter splice — engineer to check: the plate's eccentricity, the C-channel's torsion and the axial force are not included.Chernihiv: Rafter 8 000 mm is longer than the 6 000 mm stock length — 2 pieces: Кр1а 3 300, Кр1б 4 700 mm. Splice — plate Н1 L 300 mm of the same profile, back to back, 2+2 bolts M10 cl. 8.8, at 3 300 mm from the lower end of the rafter, where the moment is small. Bolt: 8.59 kN vs 18.00 kN (48%), plate 8%. Rafter splice — engineer to check: the plate's eccentricity, the C-channel's torsion and the axial force are not included.
- 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 2 120 mm, 7 frames. Purlin C-channel 60×40×2: strength 97%, deflection 81% of L/200 (snow on panel 977 Pa).Chernihiv: Frame spacing 1 440 mm, 10 frames. Purlin C-channel 41×41×2.5: strength 86%, deflection 61% 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 80×80×3 | 3,000 | 7 |
| П2 | Rear post | Tube 80×80×3 | 5,840 | 7 |
| П3 | Middle post | Tube 80×80×3 | 4,420 | 7 |
| Кр1а | Rafter (inclined beam) | C-channel 100×50×2.5 | 3,300 | 7 |
| Кр1б | Rafter (inclined beam) | C-channel 100×50×2.5 | 4,700 | 7 |
| Н1 | Rafter splice plate | C-channel 100×50×2.5 | 300 | 7 |
| Пк1 | Frame strut | C-channel 60×40×2 | 3,436 | 7 |
| Пк2 | Front frame strut | C-channel 60×40×2 | 2,176 | 7 |
| Х1 | Longitudinal brace (cross) | C-channel 60×40×2 | 4,069 | 4 |
| Р1 | Purlin (rail) | C-channel 60×40×2 | 6,000 | 4 |
| Р2 | Purlin (rail) | C-channel 60×40×2 | 6,000 | 4 |
| Р3 | Purlin (rail) | C-channel 60×40×2 | 6,000 | 4 |
| Р4 | Purlin (rail) | C-channel 60×40×2 | 6,000 | 4 |
| Р5 | Purlin (rail) | C-channel 60×40×2 | 1,370 | 4 |
| Р6 | Purlin (rail) | C-channel 60×40×2 | 1,370 | 4 |
| — | Bolt M10×100 / M10×25 set · frame and struts / purlins, braces, connectors | — | — | 73 |
| — | Bolt M10×120 set · purlin to rafter | — | — | 56 |
| — | Bolt M10×140 set · strut to post | — | — | 7 |
| — | Bolt M10×150 set · post–rafter, strut to rafter — through spacer inserts | — | — | 49 |
| — | Bolt M10×160 set · brace to post — through spacer inserts | — | — | 8 |
| — | Bolt M10×200 set · strut to rafter — through spacer inserts | — | — | 7 |
| — | Bolt M10×25 set · rafter splice (plate Н1) | — | — | 28 |
| — | End clamp 30 mm | — | — | 16 |
| — | Mid clamp (30–40 mm) | — | — | 72 |
| — | Bolt M8×50 + channel nut | — | — | 88 |
| — | Concrete for 21 posts, Ø500×1700 | — | — | 7.71 m³ |
Profile cutting
63 bars of 6,000 mm, 313.4 m of profile in total.
- Tube 80×80×321 bars
- C-channel 100×50×2.514 bars
- C-channel 60×40×228 bars
Estimated cost
The engine's materials estimate for the median zone (Cherkasy).
- Materials
- 176,581₴
- With installation and delivery
- 238,446₴
- Per 1 kW
- 9,772UAH/kW
Prices are the typical market prices built into the Solispec engine, as of 06.10.2026; no margin, no VAT.
All 26 lines of the engine's estimate, with prices
| Item | Quantity | Price, UAH | Sum, UAH |
|---|---|---|---|
| Tube 80×80×3, stock length 6 000 mm | 21 bar | 420 | 52,920 |
| C-channel 100×50×2.5, stock length 6 000 mm | 14 bar | 380 | 31,920 |
| C-channel 60×40×2, stock length 6 000 mm | 28 bar | 230 | 38,640 |
| C-channel connector (splice plate L 300) | 16 pcs | 90 | 1,440 |
| Bolt M10×100 cl. 8.8 set — frame, struts | 7 pcs | 22 | 154 |
| Bolt M10×25 cl. 8.8 set — purlins, braces, connectors | 89 pcs | 22 | 1,958 |
| Bolt M10×120 cl. 8.8 set — purlin to rafter | 56 pcs | 27 | 1,512 |
| Bolt M10×140 cl. 8.8 set — strut to post | 7 pcs | 27 | 189 |
| Bolt M10×150 cl. 8.8 set — post–rafter, strut to rafter — through spacer inserts | 49 pcs | 27 | 1,323 |
| Bolt M10×160 cl. 8.8 set — brace to post — through spacer inserts | 8 pcs | 27 | 216 |
| Bolt M10×200 cl. 8.8 set — strut to rafter — through spacer inserts | 7 pcs | 27 | 189 |
| Bolt M10×25 cl. 8.8 set — rafter splice (plate Н1) | 28 pcs | 22 | 616 |
| End clamp 30 mm | 16 pcs | 35 | 560 |
| Mid clamp (30–40 mm) | 72 pcs | 32 | 2,304 |
| Bolt M8×50 A2 + spring channel nut M8 | 97 pcs | 14 | 1,358 |
| Post base anchor pin (M10 / rebar Ø12) | 21 pcs | 20 | 420 |
| Borehole casing (roofing felt / PVC, 300 mm) | 21 pcs | 60 | 1,260 |
| Crushed stone 20–40 for the bottom of the boreholes | 0.41 m³ | 900 | 369 |
| Earth electrode: 2 rods Ø16×1.5 m + strip 40×4 | 1 set | 1,500 | 1,500 |
| Wire PV-3 6 mm² green-yellow | 33 m | 35 | 1,155 |
| Module earthing clip (under the clamp) | 40 pcs | 20 | 800 |
| Cable clip, stainless | 120 pcs | 5 | 600 |
| Zinc paint / cold galvanising spray 400 ml | 4 pcs | 350 | 1,400 |
| Concrete M200 for posts | 7.71 m³ | 3,800 | 29,298 |
| Rebar Ø10 (4 bars per post) | 160 m | 28 | 4,480 |
| Spacer inserts / packs — pieces of the same profile (from offcuts): 14 × 80 mm, 4 × 61 mm, 4 × 20 mm | 22 pcs | 0 | 0 |
| Materials | 176,581 | ||
Yield
Yield: 1,139 kWh per 1 kW a year, ≈ 27,786 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.