REC
Ground frame for 40 REC Alpha Pure-RX REC470AA Pure-RX (HJT) panels (4×10)
4 rows of 10 panels, 18.80 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
- 18.80kW
- Steel
- 892.7kg
- Posts
- 24
- Bolts
- 338
- Materials
- 106,402₴
- Yield
- 21,409kWh/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 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 60×60×2 | Tube 60×60×2 | Tube 60×60×2 |
| Rafters | C-channel 100×50×2.5 | Tube 60×60×2 | Tube 60×60×2 |
| Purlins and braces | C-channel 41×41×2.5 | C-channel 41×41×2.5 | C-channel 41×41×2.5 |
| Frames | 7 frames, pitch up to 1,960 mm | 8 frames, pitch up to 1,690 mm | 8 frames, pitch up to 1,690 mm |
| Posts | 14 | 24 | 24 |
| Footings (bored concrete) | 14 pcs, Ø450 mm, depth 1,500 mm | 24 pcs, Ø400 mm, depth 1,300 mm | 24 pcs, Ø350 mm, depth 1,500 mm |
| Concrete | 3.67 m³ | 4.31 m³ | 3.81 m³ |
| Tilt | 30° | 30° | 30° |
| Panel bottom / post top | 600 / 3,194 mm | 600 / 3,420 mm | 600 / 3,420 mm |
| Panel field size | 12,370 × 4,675 mm | 12,370 × 5,026 mm | 12,370 × 5,026 mm |
| Row spacing between tables (no shade on 21 December) | 15,640 mm at noon · 17,590 mm ±2 h | 17,330 mm at noon · 20,020 mm ±2 h | 19,000 mm at noon · 22,580 mm ±2 h |
| Steel | 776.8 kg | 892.7 kg | 909.9 kg |
| Bolts | M10 — 214, M8 — 88 | M10 — 250, M8 — 88 | M10 — 250, M8 — 88 |
| Panel clamps | end 16, middle 72 | end 16, middle 72 | end 16, middle 72 |
| Materials | 101,351 UAH | 106,402 UAH | 104,999 UAH |
| With installation and delivery | 149,276 UAH | 154,804 UAH | 153,401 UAH |
| Per 1 kW | 7,940 UAH/kW | 8,234 UAH/kW | 8,160 UAH/kW |
| Yield | 1,266 kWh/kW · 23,809 kWh/year | 1,139 kWh/kW · 21,409 kWh/year | 1,043 kWh/kW · 19,611 kWh/year |
| Strength σ/fy | 87% | 86% | 92% |
| Deflection / (L/200) | 85% | 72% | 77% |
| Rafter strength | 90% | 93% | 100% |
| Post utilisation | 43% | 55% | 59% |
| Utilisation | 99% | 100% | 99% |
| Depth vs frost depth | ok | ok | ok |
| Bolt utilisation | 37% | 20% | 21% |
| Plate section | 8% | 0% | 0% |
| Not included | engineer to check | engineer to check | engineer to check |
| Post utilisation П3 | — | 17% | 18% |
| 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 1 960 mm, 7 frames. Purlin C-channel 41×41×2.5: strength 87%, deflection 85% of L/200 (snow on panel 489 Pa).Cherkasy: Frame spacing 1 690 mm, 8 frames. Purlin C-channel 41×41×2.5: strength 86%, deflection 72% of L/200 (snow on panel 977 Pa).Chernihiv: Frame spacing 1 690 mm, 8 frames. Purlin C-channel 41×41×2.5: strength 92%, deflection 77% of L/200 (snow on panel 1 106 Pa).
- 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 C-channel 100×50×2.5: span between posts 3 719, cantilever 1 347 mm → strength 90%.Cherkasy: Rafter · Tube 60×60×2 · 3 posts, spans between posts 2 277 mm, cantilever 929 mm — continuous beam on 3 supports → strength 93%.Chernihiv: Rafter · Tube 60×60×2 · 3 posts, spans between posts 2 277 mm, cantilever 929 mm — continuous beam on 3 supports → strength 100%.
- 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 ≈ 20.9 kN (with γ=1.5) vs ≈ 21.1 kN (concrete weight + soil friction, estimate) → 99%.Cherkasy: Foundation Ø400 × 1 300: 0.163 m³ of concrete per post. Wind uplift on the front post ≈ 15.8 kN (with γ=1.5) vs ≈ 15.8 kN (concrete weight + soil friction, estimate) → 100%.Chernihiv: Foundation Ø350 × 1 500: 0.144 m³ of concrete per post. Wind uplift on the front post ≈ 15.4 kN (with γ=1.5) vs ≈ 15.5 kN (concrete weight + soil friction, estimate) → 99%.
- Stock length, mmKherson: Rafter 6 412 mm is longer than the 6 000 mm stock length — 2 pieces: Кр1а 6 000, Кр1б 412 mm. Splice — plate Н1 L 300 mm of the same profile, back to back, 2+2 bolts M10 cl. 8.8, at 6 000 mm from the lower end of the rafter, where the moment is small. Bolt: 6.69 kN vs 18.00 kN (37%), plate 8%. Rafter splice — engineer to check: the plate's eccentricity, the C-channel's torsion and the axial force are not included.Cherkasy: Rafter 6 412 mm is longer than the 6 000 mm stock length — 2 pieces: Кр1а 5 000, Кр1б 1 412 mm. Splice — plate Н1 L 300 mm of the same profile, back to back, 2+2 bolts M10 cl. 8.8, at 5 000 mm from the lower end of the rafter, where the moment is small. Bolt: 4.36 kN vs 22.27 kN (20%), plate 0%. Rafter splice — engineer to check: the plate's eccentricity, the C-channel's torsion and the axial force are not included.Chernihiv: Rafter 6 412 mm is longer than the 6 000 mm stock length — 2 pieces: Кр1а 5 000, Кр1б 1 412 mm. Splice — plate Н1 L 300 mm of the same profile, back to back, 2+2 bolts M10 cl. 8.8, at 5 000 mm from the lower end of the rafter, where the moment is small. Bolt: 4.67 kN vs 22.27 kN (21%), plate 0%. Rafter splice — engineer to check: the plate's eccentricity, the C-channel's torsion and the axial force are not included.
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 | 2,468 | 8 |
| П2 | Rear post | Tube 60×60×2 | 4,745 | 8 |
| П3 | Middle post | Tube 60×60×2 | 3,607 | 8 |
| Кр1а | Rafter (inclined beam) | Tube 60×60×2 | 5,000 | 8 |
| Кр1б | Rafter (inclined beam) | Tube 60×60×2 | 1,412 | 8 |
| Н1 | Rafter splice plate | Tube 60×60×2 | 300 | 8 |
| Пк1 | Frame strut | C-channel 41×41×2.5 | 2,831 | 8 |
| Пк2 | Front frame strut | C-channel 41×41×2.5 | 1,814 | 8 |
| Х1 | Longitudinal brace (cross) | C-channel 41×41×2.5 | 3,252 | 4 |
| Р1 | Purlin (rail) | C-channel 41×41×2.5 | 6,000 | 4 |
| Р2 | Purlin (rail) | C-channel 41×41×2.5 | 6,000 | 4 |
| Р3 | Purlin (rail) | C-channel 41×41×2.5 | 6,000 | 4 |
| Р4 | Purlin (rail) | C-channel 41×41×2.5 | 6,000 | 4 |
| Р5 | Purlin (rail) | C-channel 41×41×2.5 | 370 | 4 |
| Р6 | Purlin (rail) | C-channel 41×41×2.5 | 370 | 4 |
| — | Bolt M10×140 / M10×80 set · frame and struts / purlins, braces, connectors | — | — | 194 |
| — | Bolt M10×110 set · brace to post — through spacer inserts | — | — | 4 |
| — | Bolt M10×150 set · strut to rafter — through spacer inserts | — | — | 16 |
| — | Bolt M10×160 set · brace to post — through spacer inserts | — | — | 4 |
| — | Bolt M10×140 set · rafter splice (plate Н1) | — | — | 32 |
| — | End clamp 30 mm | — | — | 16 |
| — | Mid clamp (30–40 mm) | — | — | 72 |
| — | Bolt M8×50 + channel nut | — | — | 88 |
| — | Concrete for 24 posts, Ø400×1300 | — | — | 4.31 m³ |
Profile cutting
54 bars of 6,000 mm, 289.4 m of profile in total.
- Tube 60×60×228 bars
- C-channel 41×41×2.526 bars
Estimated cost
The engine's materials estimate for the median zone (Cherkasy).
- Materials
- 106,402₴
- With installation and delivery
- 154,804₴
- Per 1 kW
- 8,234UAH/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 | 28 bar | 210 | 35,280 |
| C-channel 41×41×2.5, stock length 6 000 mm | 26 bar | 200 | 31,200 |
| C-channel connector (splice plate L 300) | 16 pcs | 90 | 1,440 |
| Bolt M10×140 cl. 8.8 set — frame, struts | 64 pcs | 22 | 1,408 |
| Bolt M10×80 cl. 8.8 set — purlins, braces, connectors | 155 pcs | 22 | 3,410 |
| Bolt M10×110 cl. 8.8 set — brace to post — through spacer inserts | 4 pcs | 27 | 108 |
| Bolt M10×150 cl. 8.8 set — strut to rafter — through spacer inserts | 16 pcs | 27 | 432 |
| Bolt M10×160 cl. 8.8 set — brace to post — through spacer inserts | 4 pcs | 27 | 108 |
| Bolt M10×140 cl. 8.8 set — rafter splice (plate Н1) | 32 pcs | 22 | 704 |
| 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) | 24 pcs | 20 | 480 |
| Borehole casing (roofing felt / PVC, 300 mm) | 24 pcs | 60 | 1,440 |
| Crushed stone 20–40 for the bottom of the boreholes | 0.30 m³ | 900 | 270 |
| Earth electrode: 2 rods Ø16×1.5 m + strip 40×4 | 1 set | 1,500 | 1,500 |
| Wire PV-3 6 mm² green-yellow | 34 m | 35 | 1,190 |
| 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 | 4.31 m³ | 3,800 | 16,378 |
| Rebar Ø10 (4 bars per post) | 144 m | 28 | 4,032 |
| Spacer inserts / packs — pieces of the same profile (from offcuts): 4 × 71 mm, 16 × 70 mm, 4 × 30 mm, 16 × 10 mm | 40 pcs | 0 | 0 |
| Materials | 106,402 | ||
Yield
Yield: 1,139 kWh per 1 kW a year, ≈ 21,409 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.