Ground frame for 12 GCL-NT10/78GDF 640 panels (2×6)

2 rows of 6 panels, 7.68 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: 7.68kW
Steel: 276.3kg
Posts: 10
Bolts: 104
Materials: 39,211₴
Yield: 8,746kWh/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 GCL-NT10/78GDF 640 panel and the 2 × 6 layout; site — Cherkasy. Change the site, the tilt or the profiles and the checks and estimate are recalculated.

Design the frame Tilt and row spacing

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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	C-channel 80×40×2	C-channel 80×40×2
Purlins and braces	C-channel 41×41×2.5	C-channel 60×40×2	C-channel 60×40×2
Frames	5 frames, pitch up to 1,640 mm	5 frames, pitch up to 1,640 mm	5 frames, pitch up to 1,640 mm
Posts	10	10	10
Footings (bored concrete)	10 pcs, Ø350 mm, depth 1,100 mm	10 pcs, Ø350 mm, depth 1,100 mm	10 pcs, Ø300 mm, depth 1,300 mm
Concrete	1.16 m³	1.16 m³	1.01 m³
Tilt	30°	30°	30°
Panel bottom / post top	600 / 2,363 mm	600 / 2,338 mm	600 / 2,338 mm
Panel field size	7,044 × 3,196 mm	7,044 × 3,211 mm	7,044 × 3,211 mm
Row spacing between tables (no shade on 21 December)	11,110 mm at noon · 12,490 mm ±2 h	12,310 mm at noon · 14,210 mm ±2 h	13,490 mm at noon · 16,030 mm ±2 h
Steel	279.7 kg	276.3 kg	283.5 kg
Bolts	M10 — 76, M8 — 28	M10 — 76, M8 — 28	M10 — 76, M8 — 28
Panel clamps	end 8, middle 20	end 8, middle 20	end 8, middle 20
Materials	36,881 UAH	39,211 UAH	42,618 UAH
With installation and delivery	57,241 UAH	59,581 UAH	62,988 UAH
Per 1 kW	7,453 UAH/kW	7,758 UAH/kW	8,202 UAH/kW
Yield	1,266 kWh/kW · 9,726 kWh/year	1,139 kWh/kW · 8,746 kWh/year	1,043 kWh/kW · 8,011 kWh/year
Strength σ/fy	83%	63%	67%
Deflection / (L/200)	68%	40%	43%
Rafter strength	83%	76%	82%
Post utilisation	16%	22%	23%
Utilisation	100%	87%	87%
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.

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 1 640 mm, 5 frames. Purlin C-channel 41×41×2.5: strength 83%, deflection 68% of L/200 (snow on panel 489 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 60×40×2: span between posts 2 349, cantilever 851 mm → strength 83%.Chernihiv: Rafter C-channel 80×40×2: span between posts 2 349, cantilever 851 mm → strength 82%.
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 Ø350 × 1 100: 0.106 m³ of concrete per post. Wind uplift on the front post ≈ 11.3 kN (with γ=1.5) vs ≈ 11.4 kN (concrete weight + soil friction, estimate) → 100%.Cherkasy: Foundation Ø350 × 1 100: 0.106 m³ of concrete per post. Wind uplift on the front post ≈ 9.9 kN (with γ=1.5) vs ≈ 11.4 kN (concrete weight + soil friction, estimate) → 87%.Chernihiv: Foundation Ø300 × 1 300: 0.092 m³ of concrete per post. Wind uplift on the front post ≈ 9.7 kN (with γ=1.5) vs ≈ 11.2 kN (concrete weight + soil friction, estimate) → 87%.

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	2,289	5
П2	Rear post	Tube 60×60×2	3,463	5
Кр1	Rafter (inclined beam)	C-channel 80×40×2	4,050	5
Пк1	Frame strut	C-channel 60×40×2	1,863	5
Х1	Longitudinal brace (cross)	C-channel 60×40×2	2,368	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	1,044	2
Р4	Purlin (rail)	C-channel 60×40×2	1,044	2
—	Bolt M10×25 set · purlins, braces, connectors	—	—	18
—	Bolt M10×90 set · strut to post — through spacer inserts	—	—	5
—	Bolt M10×100 set · purlin to rafter	—	—	20
—	Bolt M10×130 set · post–rafter — through spacer inserts	—	—	20
—	Bolt M10×140 set · strut to rafter — through spacer inserts	—	—	5
—	Bolt M10×150 set · brace to post — through spacer inserts	—	—	8
—	End clamp 30 mm	—	—	8
—	Mid clamp (30–40 mm)	—	—	20
—	Bolt M8×50 + channel nut	—	—	28
—	Concrete for 10 posts, Ø350×1100	—	—	1.16 m³

Profile cutting

18 bars of 6,000 mm, 96.0 m of profile in total.

Tube 60×60×25 bars
C-channel 80×40×25 bars
C-channel 60×40×28 bars

Estimated cost

The engine's materials estimate for the median zone (Cherkasy).

Materials: 39,211₴
With installation and delivery: 59,581₴
Per 1 kW: 7,758UAH/kW

The engine's estimate has 24 lines; the full list is in the builder. Prices are the typical market prices built into the Solispec engine, as of 06.10.2026; no margin, no VAT.

Yield

Yield: 1,139 kWh per 1 kW a year, ≈ 8,746 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.