REC
Ground frame for 40 REC Alpha Pro MG REC610AA Pro MG (HJT, bifacial) panels (2×20)
2 rows of 20 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
- 805.5kg
- Posts
- 26
- Bolts
- 288
- Materials
- 100,353₴
- 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 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 | C-channel 60×40×2 | Tube 60×60×2 | Tube 60×60×2 |
| Purlins and braces | C-channel 60×40×2 | C-channel 60×40×2 | C-channel 60×40×2 |
| Frames | 13 frames, pitch up to 2,160 mm | 13 frames, pitch up to 2,160 mm | 15 frames, pitch up to 1,860 mm |
| Posts | 26 | 26 | 30 |
| Footings (bored concrete) | 26 pcs, Ø400 mm, depth 1,100 mm | 26 pcs, Ø300 mm, depth 1,300 mm | 30 pcs, Ø300 mm, depth 1,300 mm |
| Concrete | 3.95 m³ | 2.63 m³ | 3.03 m³ |
| Tilt | 30° | 30° | 30° |
| Panel bottom / post top | 600 / 2,138 mm | 600 / 2,138 mm | 600 / 2,138 mm |
| Panel field size | 26,620 × 2,844 mm | 26,620 × 2,844 mm | 26,620 × 2,844 mm |
| Row spacing between tables (no shade on 21 December) | 9,810 mm at noon · 11,020 mm ±2 h | 10,870 mm at noon · 12,550 mm ±2 h | 11,910 mm at noon · 14,150 mm ±2 h |
| Steel | 739.8 kg | 805.5 kg | 880.1 kg |
| Bolts | M10 — 204, M8 — 84 | M10 — 204, M8 — 84 | M10 — 224, M8 — 84 |
| Panel clamps | end 8, middle 76 | end 8, middle 76 | end 8, middle 76 |
| Materials | 100,189 UAH | 100,353 UAH | 108,566 UAH |
| With installation and delivery | 161,999 UAH | 162,748 UAH | 170,973 UAH |
| Per 1 kW | 6,639 UAH/kW | 6,670 UAH/kW | 7,007 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 | 70% | 95% | 76% |
| Deflection / (L/200) | 59% | 81% | 55% |
| Rafter strength | 85% | 76% | 70% |
| Post utilisation | 17% | 23% | 21% |
| Utilisation | 95% | 100% | 84% |
| 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.
- 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 60×40×2: span between posts 2 094, cantilever 758 mm → strength 85%.
- 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 × 1 100: 0.138 m³ of concrete per post. Wind uplift on the front post ≈ 12.7 kN (with γ=1.5) vs ≈ 13.4 kN (concrete weight + soil friction, estimate) → 95%.Cherkasy: Foundation Ø300 × 1 300: 0.092 m³ of concrete per post. Wind uplift on the front post ≈ 11.2 kN (with γ=1.5) vs ≈ 11.2 kN (concrete weight + soil friction, estimate) → 100%.Chernihiv: Foundation Ø300 × 1 300: 0.092 m³ of concrete per post. Wind uplift on the front post ≈ 9.4 kN (with γ=1.5) vs ≈ 11.2 kN (concrete weight + soil friction, estimate) → 84%.
- 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 2 160 mm, 13 frames. Purlin C-channel 60×40×2: strength 95%, deflection 81% of L/200 (snow on panel 977 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 60×60×2 | 2,416 | 13 |
| П2 | Rear post | Tube 60×60×2 | 3,463 | 13 |
| Кр1 | Rafter (inclined beam) | Tube 60×60×2 | 3,610 | 13 |
| Пк1 | Frame strut | C-channel 60×40×2 | 1,688 | 13 |
| Х1 | Longitudinal brace (cross) | C-channel 60×40×2 | 2,645 | 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 | 6,000 | 2 |
| Р8 | Purlin (rail) | C-channel 60×40×2 | 6,000 | 2 |
| Р9 | Purlin (rail) | C-channel 60×40×2 | 2,620 | 2 |
| Р10 | Purlin (rail) | C-channel 60×40×2 | 2,620 | 2 |
| — | Bolt M10×140 / M10×80 set · frame and struts / purlins, braces, connectors | — | — | 183 |
| — | Bolt M10×150 set · brace to post, strut to rafter — through spacer inserts | — | — | 21 |
| — | End clamp 30 mm | — | — | 8 |
| — | Mid clamp (30–40 mm) | — | — | 76 |
| — | Bolt M8×50 + channel nut | — | — | 84 |
| — | Concrete for 26 posts, Ø300×1300 | — | — | 2.63 m³ |
Profile cutting
51 bars of 6,000 mm, 262.4 m of profile in total.
- Tube 60×60×226 bars
- C-channel 60×40×225 bars
Estimated cost
The engine's materials estimate for the median zone (Cherkasy).
- Materials
- 100,353₴
- With installation and delivery
- 162,748₴
- Per 1 kW
- 6,670UAH/kW
Prices are the typical market prices built into the Solispec engine, as of 06.10.2026; no margin, no VAT.
All 20 lines of the engine's estimate, with prices
| Item | Quantity | Price, UAH | Sum, UAH |
|---|---|---|---|
| Tube 60×60×2, stock length 6 000 mm | 26 bar | 210 | 32,760 |
| C-channel 60×40×2, stock length 6 000 mm | 25 bar | 230 | 34,500 |
| C-channel connector (splice plate L 300) | 16 pcs | 90 | 1,440 |
| Bolt M10×140 cl. 8.8 set — frame, struts | 65 pcs | 22 | 1,430 |
| Bolt M10×80 cl. 8.8 set — purlins, braces, connectors | 139 pcs | 22 | 3,058 |
| Bolt M10×150 cl. 8.8 set — strut to rafter, brace to post — through spacer inserts | 21 pcs | 27 | 567 |
| 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) | 26 pcs | 20 | 520 |
| Borehole casing (roofing felt / PVC, 300 mm) | 26 pcs | 60 | 1,560 |
| Crushed stone 20–40 for the bottom of the boreholes | 0.18 m³ | 900 | 162 |
| Earth electrode: 2 rods Ø16×1.5 m + strip 40×4 | 1 set | 1,500 | 1,500 |
| Wire PV-3 6 mm² green-yellow | 58 m | 35 | 2,030 |
| 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 | 2.63 m³ | 3,800 | 9,994 |
| Rebar Ø10 (4 bars per post) | 156 m | 28 | 4,368 |
| Spacer inserts / packs — pieces of the same profile (from offcuts): 4 × 71 mm, 13 × 70 mm, 4 × 30 mm, 13 × 10 mm | 34 pcs | 0 | 0 |
| Materials | 100,353 | ||
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.