REC
Ground frame for 60 REC Alpha Pure 2 REC420AA Pure 2 (HJT) panels (3×20)
3 rows of 20 panels, 25.20 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
- 25.20kW
- Steel
- 1,087.6kg
- Posts
- 26
- Bolts
- 390
- Materials
- 140,238₴
- Yield
- 28,697kWh/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 3 × 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 100×50×2.5 | C-channel 100×50×2.5 |
| Purlins and braces | C-channel 41×41×2.5 | C-channel 41×41×2.5 | C-channel 60×40×2 |
| Frames | 15 frames, pitch up to 1,490 mm | 13 frames, pitch up to 1,730 mm | 12 frames, pitch up to 1,890 mm |
| Posts | 30 | 26 | 24 |
| Footings (bored concrete) | 30 pcs, Ø400 mm, depth 1,100 mm | 26 pcs, Ø350 mm, depth 1,300 mm | 24 pcs, Ø350 mm, depth 1,300 mm |
| Concrete | 4.56 m³ | 3.58 m³ | 3.30 m³ |
| Tilt | 30° | 30° | 30° |
| Panel bottom / post top | 600 / 2,674 mm | 600 / 2,657 mm | 600 / 2,641 mm |
| Panel field size | 21,320 × 3,735 mm | 21,320 × 3,745 mm | 21,320 × 3,755 mm |
| Row spacing between tables (no shade on 21 December) | 12,640 mm at noon · 14,210 mm ±2 h | 14,010 mm at noon · 16,180 mm ±2 h | 15,360 mm at noon · 18,250 mm ±2 h |
| Steel | 1,156.8 kg | 1,087.6 kg | 1,030.5 kg |
| Bolts | M10 — 292, M8 — 126 | M10 — 264, M8 — 126 | M10 — 250, M8 — 126 |
| Panel clamps | end 12, middle 114 | end 12, middle 114 | end 12, middle 114 |
| Materials | 139,746 UAH | 140,238 UAH | 138,328 UAH |
| With installation and delivery | 204,131 UAH | 203,708 UAH | 202,030 UAH |
| Per 1 kW | 8,100 UAH/kW | 8,084 UAH/kW | 8,017 UAH/kW |
| Yield | 1,266 kWh/kW · 31,914 kWh/year | 1,139 kWh/kW · 28,697 kWh/year | 1,043 kWh/kW · 26,287 kWh/year |
| Strength σ/fy | 53% | 96% | 68% |
| Deflection / (L/200) | 39% | 82% | 51% |
| Rafter strength | 77% | 63% | 74% |
| Post utilisation | 20% | 31% | 36% |
| Utilisation | 91% | 92% | 98% |
| 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 Ø400 × 1 100: 0.138 m³ of concrete per post. Wind uplift on the front post ≈ 12.1 kN (with γ=1.5) vs ≈ 13.4 kN (concrete weight + soil friction, estimate) → 91%.Cherkasy: Foundation Ø350 × 1 300: 0.125 m³ of concrete per post. Wind uplift on the front post ≈ 12.3 kN (with γ=1.5) vs ≈ 13.4 kN (concrete weight + soil friction, estimate) → 92%.Chernihiv: Foundation Ø350 × 1 300: 0.125 m³ of concrete per post. Wind uplift on the front post ≈ 13.1 kN (with γ=1.5) vs ≈ 13.4 kN (concrete weight + soil friction, estimate) → 98%.
- 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 1 730 mm, 13 frames. Purlin C-channel 41×41×2.5: strength 96%, deflection 82% 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 | 2,528 | 13 |
| П2 | Rear post | Tube 60×60×2 | 3,982 | 13 |
| Кр1 | Rafter (inclined beam) | C-channel 100×50×2.5 | 5,015 | 13 |
| Пк1 | Frame strut | C-channel 41×41×2.5 | 2,150 | 13 |
| Пк2 | Front frame strut | C-channel 41×41×2.5 | 2,833 | 13 |
| Х1 | Longitudinal brace (cross) | C-channel 41×41×2.5 | 2,662 | 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 | 6,000 | 3 |
| Р6 | Purlin (rail) | C-channel 41×41×2.5 | 6,000 | 3 |
| Р7 | Purlin (rail) | C-channel 41×41×2.5 | 3,320 | 3 |
| Р8 | Purlin (rail) | C-channel 41×41×2.5 | 3,320 | 3 |
| — | Bolt M10×80 / M10×25 set · frame and struts / purlins, braces, connectors | — | — | 85 |
| — | Bolt M10×65 set · brace crossing | — | — | 2 |
| — | Bolt M10×90 set · strut to post — through spacer inserts | — | — | 13 |
| — | Bolt M10×110 set · brace to post — through spacer inserts | — | — | 4 |
| — | Bolt M10×120 set · purlin to rafter | — | — | 78 |
| — | Bolt M10×130 set · post–rafter, strut to post — through spacer inserts | — | — | 65 |
| — | Bolt M10×140 set · strut to rafter — through spacer inserts | — | — | 13 |
| — | Bolt M10×160 set · brace to post — through spacer inserts | — | — | 4 |
| — | End clamp 30 mm | — | — | 12 |
| — | Mid clamp (30–40 mm) | — | — | 114 |
| — | Bolt M8×50 + channel nut | — | — | 126 |
| — | Concrete for 26 posts, Ø350×1300 | — | — | 3.58 m³ |
Profile cutting
69 bars of 6,000 mm, 353.2 m of profile in total.
- Tube 60×60×220 bars
- C-channel 100×50×2.513 bars
- C-channel 41×41×2.536 bars
Estimated cost
The engine's materials estimate for the median zone (Cherkasy).
- Materials
- 140,238₴
- With installation and delivery
- 203,708₴
- Per 1 kW
- 8,084UAH/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 | 20 bar | 210 | 25,200 |
| C-channel 100×50×2.5, stock length 6 000 mm | 13 bar | 380 | 29,640 |
| C-channel 41×41×2.5, stock length 6 000 mm | 36 bar | 200 | 43,200 |
| C-channel connector (splice plate L 300) | 18 pcs | 90 | 1,620 |
| Bolt M10×80 cl. 8.8 set — frame, struts | 13 pcs | 22 | 286 |
| Bolt M10×25 cl. 8.8 set — purlins, braces, connectors | 72 pcs | 22 | 1,584 |
| 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 | 13 pcs | 27 | 351 |
| 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 | 105 pcs | 27 | 2,835 |
| Bolt M10×130 cl. 8.8 set — post–rafter, strut to post — through spacer inserts | 65 pcs | 27 | 1,755 |
| Bolt M10×140 cl. 8.8 set — strut to rafter — through spacer inserts | 13 pcs | 27 | 351 |
| 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) | 114 pcs | 32 | 3,648 |
| Bolt M8×50 A2 + spring channel nut M8 | 139 pcs | 14 | 1,946 |
| 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 | 0.25 m³ | 900 | 225 |
| Earth electrode: 2 rods Ø16×1.5 m + strip 40×4 | 1 set | 1,500 | 1,500 |
| Wire PV-3 6 mm² green-yellow | 53 m | 35 | 1,855 |
| Module earthing clip (under the clamp) | 60 pcs | 20 | 1,200 |
| Cable clip, stainless | 180 pcs | 5 | 900 |
| Zinc paint / cold galvanising spray 400 ml | 4 pcs | 350 | 1,400 |
| Concrete M200 for posts | 3.58 m³ | 3,800 | 13,604 |
| 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, 13 × 50 mm, 4 × 30 mm, 13 × 10 mm | 47 pcs | 0 | 0 |
| Materials | 140,238 | ||
Yield
Yield: 1,139 kWh per 1 kW a year, ≈ 28,697 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.