Ground frame for 30 Astronergy ASTRO N7s CHSM48RN(DG)/F-BH-460 panels (3×10)

3 rows of 10 panels, 13.80 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: 13.80kW
Steel: 533.3kg
Posts: 12
Bolts: 184
Materials: 75,264₴
Yield: 15,715kWh/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 Astronergy ASTRO N7s CHSM48RN(DG)/F-BH-460 panel and the 3 × 10 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 80×40×2	C-channel 100×50×2.5	C-channel 100×50×2.5
Purlins and braces	C-channel 41×41×2.5	C-channel 60×40×2	C-channel 60×40×2
Frames	8 frames, pitch up to 1,600 mm	6 frames, pitch up to 2,200 mm	6 frames, pitch up to 2,200 mm
Posts	16	12	12
Footings (bored concrete)	16 pcs, Ø400 mm, depth 1,100 mm	12 pcs, Ø400 mm, depth 1,300 mm	12 pcs, Ø350 mm, depth 1,500 mm
Concrete	2.43 m³	2.16 m³	1.91 m³
Tilt	30°	30°	30°
Panel bottom / post top	600 / 2,550 mm	600 / 2,524 mm	600 / 2,524 mm
Panel field size	11,660 × 3,539 mm	11,660 × 3,553 mm	11,660 × 3,553 mm
Row spacing between tables (no shade on 21 December)	11,950 mm at noon · 13,430 mm ±2 h	13,240 mm at noon · 15,290 mm ±2 h	14,510 mm at noon · 17,250 mm ±2 h
Steel	573.7 kg	533.3 kg	541.9 kg
Bolts	M10 — 146, M8 — 66	M10 — 118, M8 — 66	M10 — 118, M8 — 66
Panel clamps	end 12, middle 54	end 12, middle 54	end 12, middle 54
Materials	74,308 UAH	75,264 UAH	74,529 UAH
With installation and delivery	109,685 UAH	110,774 UAH	110,039 UAH
Per 1 kW	7,948 UAH/kW	8,027 UAH/kW	7,974 UAH/kW
Yield	1,266 kWh/kW · 17,477 kWh/year	1,139 kWh/kW · 15,715 kWh/year	1,043 kWh/kW · 14,395 kWh/year
Strength σ/fy	57%	81%	87%
Deflection / (L/200)	45%	70%	75%
Rafter strength	76%	72%	77%
Post utilisation	19%	35%	37%
Utilisation	91%	92%	92%
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 Ø400 × 1 300: 0.163 m³ of concrete per post. Wind uplift on the front post ≈ 14.6 kN (with γ=1.5) vs ≈ 15.8 kN (concrete weight + soil friction, estimate) → 92%.Chernihiv: Foundation Ø350 × 1 500: 0.144 m³ of concrete per post. Wind uplift on the front post ≈ 14.2 kN (with γ=1.5) vs ≈ 15.5 kN (concrete weight + soil friction, estimate) → 92%.
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 2 200 mm, 6 frames. Purlin C-channel 60×40×2: strength 81%, deflection 70% of L/200 (snow on panel 977 Pa).Chernihiv: Frame spacing 2 200 mm, 6 frames. Purlin C-channel 60×40×2: strength 87%, deflection 75% of L/200 (snow on panel 1 106 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	2,473	6
П2	Rear post	Tube 60×60×2	3,849	6
Кр1	Rafter (inclined beam)	C-channel 100×50×2.5	4,746	6
Пк1	Frame strut	C-channel 60×40×2	2,034	6
Пк2	Front frame strut	C-channel 60×40×2	2,681	6
Х1	Longitudinal brace (cross)	C-channel 60×40×2	2,908	4
Р1	Purlin (rail)	C-channel 60×40×2	6,000	3
Р2	Purlin (rail)	C-channel 60×40×2	6,000	3
Р3	Purlin (rail)	C-channel 60×40×2	5,660	3
Р4	Purlin (rail)	C-channel 60×40×2	5,660	3
—	Bolt M10×80 / M10×25 set · frame and struts / purlins, braces, connectors	—	—	32
—	Bolt M10×90 set · strut to post — through spacer inserts	—	—	6
—	Bolt M10×120 set · purlin to rafter	—	—	36
—	Bolt M10×130 set · post–rafter, strut to post — through spacer inserts	—	—	30
—	Bolt M10×140 set · strut to rafter — through spacer inserts	—	—	6
—	Bolt M10×150 set · brace to post — through spacer inserts	—	—	8
—	End clamp 30 mm	—	—	12
—	Mid clamp (30–40 mm)	—	—	54
—	Bolt M8×50 + channel nut	—	—	66
—	Concrete for 12 posts, Ø400×1300	—	—	2.16 m³

Profile cutting

35 bars of 6,000 mm, 176.3 m of profile in total.

Tube 60×60×29 bars
C-channel 100×50×2.56 bars
C-channel 60×40×220 bars

Estimated cost

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

Materials: 75,264₴
With installation and delivery: 110,774₴
Per 1 kW: 8,027UAH/kW

The engine's estimate has 25 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, ≈ 15,715 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.