REC
Ground frame for 30 REC Alpha Pro MG REC610AA Pro MG (HJT, bifacial) panels (3×10)
3 rows of 10 panels, 18.30 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
- 18.30kW
- Steel
- 801.5kg
- Posts
- 18
- Bolts
- 250
- Materials
- 99,446₴
- Yield
- 20,840kWh/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 3 × 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 | C-channel 100×50×2.5 | C-channel 100×50×2.5 |
| Purlins and braces | C-channel 60×40×2 | C-channel 41×41×2.5 | C-channel 60×40×2 |
| Frames | 7 frames, pitch up to 2,120 mm | 9 frames, pitch up to 1,610 mm | 8 frames, pitch up to 1,830 mm |
| Posts | 14 | 18 | 16 |
| Footings (bored concrete) | 14 pcs, Ø450 mm, depth 1,500 mm | 18 pcs, Ø400 mm, depth 1,300 mm | 16 pcs, Ø350 mm, depth 1,500 mm |
| Concrete | 3.67 m³ | 3.24 m³ | 2.54 m³ |
| Tilt | 30° | 30° | 30° |
| Panel bottom / post top | 600 / 2,988 mm | 600 / 3,004 mm | 600 / 2,988 mm |
| Panel field size | 13,370 × 4,356 mm | 13,370 × 4,346 mm | 13,370 × 4,356 mm |
| Row spacing between tables (no shade on 21 December) | 14,730 mm at noon · 16,560 mm ±2 h | 16,320 mm at noon · 18,850 mm ±2 h | 17,890 mm at noon · 21,260 mm ±2 h |
| Steel | 688.4 kg | 801.5 kg | 750.2 kg |
| Bolts | M10 — 156, M8 — 66 | M10 — 184, M8 — 66 | M10 — 170, M8 — 66 |
| Panel clamps | end 12, middle 54 | end 12, middle 54 | end 12, middle 54 |
| Materials | 92,796 UAH | 99,446 UAH | 94,370 UAH |
| With installation and delivery | 139,573 UAH | 145,988 UAH | 141,060 UAH |
| Per 1 kW | 7,627 UAH/kW | 7,977 UAH/kW | 7,708 UAH/kW |
| Yield | 1,266 kWh/kW · 23,176 kWh/year | 1,139 kWh/kW · 20,840 kWh/year | 1,043 kWh/kW · 19,089 kWh/year |
| Strength σ/fy | 71% | 98% | 76% |
| Deflection / (L/200) | 59% | 78% | 54% |
| Rafter strength | 79% | 80% | 98% |
| Post utilisation | 40% | 41% | 49% |
| Utilisation | 99% | 88% | 100% |
| 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.
- 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 ≈ 13.9 kN (with γ=1.5) vs ≈ 15.8 kN (concrete weight + soil friction, estimate) → 88%.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) → 100%.
- 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 1 610 mm, 9 frames. Purlin C-channel 41×41×2.5: strength 98%, deflection 78% of L/200 (snow on panel 977 Pa).
- 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 100×50×2.5: span between posts 3 367, cantilever 1 219 mm → strength 80%.Chernihiv: Rafter C-channel 100×50×2.5: span between posts 3 367, cantilever 1 219 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 | 2,646 | 9 |
| П2 | Rear post | Tube 60×60×2 | 4,329 | 9 |
| Кр1 | Rafter (inclined beam) | C-channel 100×50×2.5 | 5,805 | 9 |
| Пк1 | Frame strut | C-channel 41×41×2.5 | 2,455 | 9 |
| Пк2 | Front frame strut | C-channel 41×41×2.5 | 3,248 | 9 |
| Х1 | Longitudinal brace (cross) | C-channel 41×41×2.5 | 2,861 | 4 |
| Р1 | Purlin (rail) | C-channel 41×41×2.5 | 6,000 | 3 |
| Р2 | Purlin (rail) | C-channel 41×41×2.5 | 6,000 | 3 |
| Р3 | Purlin (rail) | C-channel 41×41×2.5 | 6,000 | 3 |
| Р4 | Purlin (rail) | C-channel 41×41×2.5 | 6,000 | 3 |
| Р5 | Purlin (rail) | C-channel 41×41×2.5 | 1,370 | 3 |
| Р6 | Purlin (rail) | C-channel 41×41×2.5 | 1,370 | 3 |
| — | Bolt M10×80 / M10×25 set · frame and struts / purlins, braces, connectors | — | — | 57 |
| — | Bolt M10×65 set · brace crossing | — | — | 2 |
| — | Bolt M10×90 set · strut to post — through spacer inserts | — | — | 9 |
| — | Bolt M10×110 set · brace to post — through spacer inserts | — | — | 4 |
| — | Bolt M10×120 set · purlin to rafter | — | — | 54 |
| — | Bolt M10×130 set · post–rafter, strut to post — through spacer inserts | — | — | 45 |
| — | Bolt M10×140 set · strut to rafter — through spacer inserts | — | — | 9 |
| — | Bolt M10×160 set · brace to post — through spacer inserts | — | — | 4 |
| — | End clamp 30 mm | — | — | 12 |
| — | Mid clamp (30–40 mm) | — | — | 54 |
| — | Bolt M8×50 + channel nut | — | — | 66 |
| — | Concrete for 18 posts, Ø400×1300 | — | — | 3.23 m³ |
Profile cutting
48 bars of 6,000 mm, 258.0 m of profile in total.
- Tube 60×60×214 bars
- C-channel 100×50×2.59 bars
- C-channel 41×41×2.525 bars
Estimated cost
The engine's materials estimate for the median zone (Cherkasy).
- Materials
- 99,446₴
- With installation and delivery
- 145,988₴
- Per 1 kW
- 7,977UAH/kW
Prices are the typical market prices built into the Solispec engine, as of 06.10.2026; no margin, no VAT.
All 27 lines of the engine's estimate, with prices
| Item | Quantity | Price, UAH | Sum, UAH |
|---|---|---|---|
| Tube 60×60×2, stock length 6 000 mm | 14 bar | 210 | 17,640 |
| C-channel 100×50×2.5, stock length 6 000 mm | 9 bar | 380 | 20,520 |
| C-channel 41×41×2.5, stock length 6 000 mm | 25 bar | 200 | 30,000 |
| C-channel connector (splice plate L 300) | 12 pcs | 90 | 1,080 |
| Bolt M10×80 cl. 8.8 set — frame, struts | 9 pcs | 22 | 198 |
| Bolt M10×25 cl. 8.8 set — purlins, braces, connectors | 48 pcs | 22 | 1,056 |
| Bolt M10×65 cl. 8.8 set — brace crossing | 2 pcs | 27 | 54 |
| Bolt M10×90 cl. 8.8 set — strut to post — through spacer inserts | 9 pcs | 27 | 243 |
| Bolt M10×110 cl. 8.8 set — brace to post — through spacer inserts | 4 pcs | 27 | 108 |
| Bolt M10×120 cl. 8.8 set — purlin to rafter | 73 pcs | 27 | 1,971 |
| Bolt M10×130 cl. 8.8 set — post–rafter, strut to post — through spacer inserts | 45 pcs | 27 | 1,215 |
| Bolt M10×140 cl. 8.8 set — strut to rafter — through spacer inserts | 9 pcs | 27 | 243 |
| Bolt M10×160 cl. 8.8 set — brace to post — through spacer inserts | 4 pcs | 27 | 108 |
| End clamp 30 mm | 12 pcs | 35 | 420 |
| Mid clamp (30–40 mm) | 54 pcs | 32 | 1,728 |
| Bolt M8×50 A2 + spring channel nut M8 | 73 pcs | 14 | 1,022 |
| Post base anchor pin (M10 / rebar Ø12) | 18 pcs | 20 | 360 |
| Borehole casing (roofing felt / PVC, 300 mm) | 18 pcs | 60 | 1,080 |
| Crushed stone 20–40 for the bottom of the boreholes | 0.23 m³ | 900 | 207 |
| Earth electrode: 2 rods Ø16×1.5 m + strip 40×4 | 1 set | 1,500 | 1,500 |
| Wire PV-3 6 mm² green-yellow | 37 m | 35 | 1,295 |
| Module earthing clip (under the clamp) | 30 pcs | 20 | 600 |
| Cable clip, stainless | 90 pcs | 5 | 450 |
| Zinc paint / cold galvanising spray 400 ml | 3 pcs | 350 | 1,050 |
| Concrete M200 for posts | 3.23 m³ | 3,800 | 12,274 |
| Rebar Ø10 (4 bars per post) | 108 m | 28 | 3,024 |
| Spacer inserts / packs — pieces of the same profile (from offcuts): 4 × 71 mm, 9 × 70 mm, 9 × 50 mm, 4 × 30 mm, 9 × 10 mm | 35 pcs | 0 | 0 |
| Materials | 99,446 | ||
Yield
Yield: 1,139 kWh per 1 kW a year, ≈ 20,840 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.