Cable sizing governed by ampacity and voltage drop.
48 × 1 × 6 mm² · 0 × 1 × 10 mm²
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Horizon is not just sketching,
engineering preciselyWith the proof. ↘
Horizon will never cost you thousands of euros a year. ↗
Every contour. Every row. Every connection.
Horizon Design brings terrain, layout, BoT, BoQ, electrical and civil engineering into one utility-scale solar workflow.
HORIZON DESIGN / SITE EXPLORER
FIXED-TILT ARRAY / 3D SITE VIEW
CAD-BASED VISUALIZATION
FIXED-TILT ARRAY / 3D SITE VIEW
CAD-BASED VISUALIZATION
↑ N
┼
┼
FIXED TILT / UTILITY SCALE ↗
0 string voltage failures shown.
Voltage basis still requires verification.
STRINGS48
POSITIVE CABLE2,142 m
NEGATIVE CABLE2,197 m
TOTAL BOQ · +2%4,426 m
| STRING | MODULES | L+ / m | L− / m | LOOP / m | CABLE | CABLE CHECK | VOLTAGE BASIS |
|---|---|---|---|---|---|---|---|
| String 1-3 | 28 | 75.239 | 76.383 | 151.622 | 1 × 6 mm² | ✓ PASS | VERIFY BASIS |
| String 1-4 | 26 | 5.917 | 7.061 | 12.978 | 1 × 6 mm² | ✓ PASS | VERIFY BASIS |
| String 1-5 | 28 | 37.575 | 38.719 | 76.294 | 1 × 6 mm² | ✓ PASS | VERIFY BASIS |
| String 1-6 | 28 | 69.233 | 70.377 | 139.610 | 1 × 6 mm² | ✓ PASS | VERIFY BASIS |
| String 1-7 | 28 | 6.023 | 7.167 | 13.190 | 1 × 6 mm² | ✓ PASS | VERIFY BASIS |
Why separate cable sizing from string voltage?
A cable-sizing pass and a string-voltage assessment answer different engineering questions. In this supplied example, cable sizing passes while the voltage design remains incomplete. Zero reported voltage failures does not make an incomplete assessment complete.
Design basis & references
References visible in the supplied example include IEC 60364-5-52 for current-carrying capacity and voltage drop, and IEC 60287-1-1 for cable current rating and resistance calculations.
The reference list is shown as part of the product example; this presentation does not independently certify compliance.
From individual string checks to a quantified cable BOQ.
ONE CONNECTED WORKFLOW⌁ TERRAIN▥ ARRAY LAYOUT⌘ ELECTRICAL↗ CIVIL SOLUTIONS▤ BoQ/BoM
Proof / Engineering results
The result.
The basis. With proof.
String-by-string checks and the design references behind them. Cable sizing and string voltage are assessed independently, with the result and recommendation visible.
| INVERTER | STRING | Ns | L+ / m | L− / m | LOOP / m | CABLE | CABLE | RECOMMENDATION |
|---|---|---|---|---|---|---|---|---|
| INV 1-1 | String 1-3 | 28 | 75.239 | 76.383 | 151.622 | 1 × 6 mm² | ✓ PASS | ≤ 24 modules/string |
| INV 1-1 | String 1-4 | 26 | 5.917 | 7.061 | 12.978 | 1 × 6 mm² | ✓ PASS | ≤ 24 modules/string |
| INV 1-1 | String 1-5 | 28 | 37.575 | 38.719 | 76.294 | 1 × 6 mm² | ✓ PASS | ≤ 24 modules/string |
| INV 1-1 | String 1-6 | 28 | 69.233 | 70.377 | 139.610 | 1 × 6 mm² | ✓ PASS | ≤ 24 modules/string |
| INV 1-1 | String 1-7 | 28 | 6.023 | 7.167 | 13.190 | 1 × 6 mm² | ✓ PASS | ≤ 24 modules/string |
| INV 1-1 | String 1-8 | 26 | 37.681 | 38.825 | 76.506 | 1 × 6 mm² | ✓ PASS | ≤ 24 modules/string |
| INV 1-1 | String 1-9 | 28 | 69.339 | 70.483 | 139.822 | 1 × 6 mm² | ✓ PASS | ≤ 24 modules/string |
| INV 1-1 | String 1-10 | 28 | 0.917 | 2.061 | 2.978 | 1 × 6 mm² | ✓ PASS | ≤ 24 modules/string |
| INV 1-1 | String 1-11 | 28 | 32.575 | 33.719 | 66.294 | 1 × 6 mm² | ✓ PASS | ≤ 24 modules/string |
| INV 1-1 | String 1-12 | 26 | 64.233 | 65.377 | 129.610 | 1 × 6 mm² | ✓ PASS | ≤ 24 modules/string |
| REFERENCE / REGULATION | EDITION | REFERENCED CLAUSES | USED FOR |
|---|---|---|---|
| IEC 60364-5-52 | 2009 + AMD1:2024 (CSV) | 523; 525; Annex B; Annex G | Current-carrying capacity and voltage drop |
| IEC 60287-1-1 | 2023 | 4; 4.2.2; 4.5; 5.1 | Cable current-rating and resistance methodology |
| IEC 62548-1 | 2023 + AMD1:2025 (CSV) | 7.2.2; 7.2.8; 7.3.3; Annex F.1.1 | PV-array voltage, DC current rating and wiring |
| IEC 60364-7-712 | 2025 | 712.523; 712.524; Annex A.1; Annex A.2; Annex D | PV current-carrying capacity and conductor sizing |
| IEC 62930 | 2017 | Product standard — no single formula clause | PV DC cable product conformity |
| EN 50618 | 2014 | Product standard — no single formula clause | H1Z2Z2-K cable product conformity |
Supplied Horizon product example. Cable checks pass; the displayed string voltage checks fail and include a corrective recommendation.
Engineering in practice
A layout is only the beginning.
The numbers must stand up.
Cable sizing. Voltage drop. Material quantities. Separate checks, visible results and a clear design basis. This is what “We are engineering.” looks like.
Cable sizing governed by ampacity and voltage drop.
48 × 1 × 6 mm² · 0 × 1 × 10 mm²
0 string voltage failures shown.
Voltage basis still requires verification.
STRINGS48
POSITIVE CABLE2,142 m
NEGATIVE CABLE2,197 m
TOTAL BOQ · +2%4,426 m
| STRING | MODULES | L+ / m | L− / m | LOOP / m | CABLE | CABLE CHECK | VOLTAGE BASIS |
|---|---|---|---|---|---|---|---|
| String 1-3 | 28 | 75.239 | 76.383 | 151.622 | 1 × 6 mm² | ✓ PASS | VERIFY BASIS |
| String 1-4 | 26 | 5.917 | 7.061 | 12.978 | 1 × 6 mm² | ✓ PASS | VERIFY BASIS |
| String 1-5 | 28 | 37.575 | 38.719 | 76.294 | 1 × 6 mm² | ✓ PASS | VERIFY BASIS |
| String 1-6 | 28 | 69.233 | 70.377 | 139.610 | 1 × 6 mm² | ✓ PASS | VERIFY BASIS |
| String 1-7 | 28 | 6.023 | 7.167 | 13.190 | 1 × 6 mm² | ✓ PASS | VERIFY BASIS |
Why separate cable sizing from string voltage?
A cable-sizing pass and a string-voltage assessment answer different engineering questions. In this supplied example, cable sizing passes while the voltage design remains incomplete. Zero reported voltage failures does not make an incomplete assessment complete.
Design basis & references
References visible in the supplied example include IEC 60364-5-52 for current-carrying capacity and voltage drop, and IEC 60287-1-1 for cable current rating and resistance calculations.
The reference list is shown as part of the product example; this presentation does not independently certify compliance.
From individual string checks to a quantified cable BOQ.
Adapted from the supplied Horizon screen. Selected rows shown. This is a product example, not a live calculation.
01 / The platform
From complex terrain.
To considered design.
Solar engineering starts with the land. Keep the physical site, the array and the electrical design connected from the first decision to the final deliverable.
Work with the land.
Bring terrain into the design conversation. Understand contours, site boundaries and slope before committing to an array layout.
Give every row a reason.
Develop fixed-tilt utility-scale layouts with the site in view. Consider row spacing, orientation and access as part of one coherent design.
Close the engineering loop.
Connect layout decisions to electrical engineering and carry the design into bills of materials and DXF deliverables.
The calculation library
Engineering depth.
Beyond the layout.
Structured inputs. Traceable results. Linked references. Explore the electrical and civil calculation tools behind Horizon’s engineering workflow.
Electrical calculators
FROM CABLE SIZING TO GROUNDINGPV DC
DC Cable Sizing & Voltage Drop
PV DC voltage rating, ampacity, voltage drop and maximum route length.
STRUCTURED INPUTS · DESIGN BASIS
LV AC
AC Cable Sizing & Voltage Drop
Three-phase LV cable current, R/X voltage drop, formation-aware ampacity and losses.
STRUCTURED INPUTS · DESIGN BASIS
MV AC
MV Cable Sizing & Voltage Drop
MV cable loading, flat/trefoil formation, voltage drop and short-circuit checks.
STRUCTURED INPUTS · DESIGN BASIS
EARTHING
Earthing / Grounding
Ground current, conductor sizing, earth resistance, GPR, touch and step voltage checks.
STRUCTURED INPUTS · DESIGN BASIS
PROTECTION
Short-Circuit Calculation
System short-circuit current and equipment withstand verification.
STRUCTURED INPUTS · DESIGN BASIS
TRANSFORMER
Transformer Sizing
Transformer loading, redundancy, losses and preliminary rating selection.
STRUCTURED INPUTS · DESIGN BASIS
PV DC
PV String & Inverter Sizing
String length, MPPT window, inverter DC loading and operating-envelope checks.
STRUCTURED INPUTS · DESIGN BASIS
SECURITY
CCTV
Camera coverage, placement and surveillance planning for utility-scale solar sites.
SITE SECURITY · COVERAGE
Civil calculators
FROM FOUNDATIONS TO SITE ROADSFOUNDATION
Substation / Central Inverter Foundation & Slab
Slab, pedestal, blinding, aggregate, formwork and reinforcement quantities.
STRUCTURED INPUTS · DESIGN BASIS
DRILLED COLUMNS
Drilled Columns — Drilling & Concrete Quantity
Drilling length, bore volume and concrete quantities by diameter, table and concrete class.
STRUCTURED INPUTS · DESIGN BASIS
TRENCH
Cable Trench
Trench excavation, bedding, warning layer, backfill and route quantities.
STRUCTURED INPUTS · DESIGN BASIS
FOUNDATION
Equipment Foundation
Foundation geometry, excavation, lean concrete, structural concrete and formwork quantities.
STRUCTURED INPUTS · DESIGN BASIS
ROAD
Internal Perimeter Road
Road earthworks, pavement layers, aggregate mass and geotextile quantities.
STRUCTURED INPUTS · DESIGN BASIS
ROAD
Internal Service Road
Service-road earthworks, pavement layers, aggregate mass and geotextile quantities.
STRUCTURED INPUTS · DESIGN BASIS
EARTHWORKS
Excavation & Fill
Bulk excavation, fill, swell/shrink and haul quantity calculations.
STRUCTURED INPUTS · DESIGN BASIS
CONCRETE
Concrete Quantity
Concrete volume calculation by structural element and concrete class.
STRUCTURED INPUTS · DESIGN BASIS
REBAR
Reinforcement Quantity
Rebar quantity, unit weight, laps, wastage and bar schedule support.
STRUCTURED INPUTS · DESIGN BASIS
DRAINAGE
Drainage
Preliminary ditch, culvert and drainage quantity calculations.
STRUCTURED INPUTS · DESIGN BASIS
SECURITY
CCTV
Camera coverage and surveillance planning for solar project sites.
HORIZON · PROJECT ENGINEERING
GRID CONNECTION
Transmission Line
Transmission-line planning and engineering for project grid connections.
HORIZON · PROJECT ENGINEERING
POWER DISTRIBUTION
Distribution Line
Distribution-line planning and engineering for project power networks.
HORIZON · PROJECT ENGINEERING
DEVELOPMENT
Project Development
Bring site planning, engineering and project development together.
HORIZON · PROJECT ENGINEERING
BEYOND THE ARRAY
And more…
Explore more tools across the solar project workflow.
HORIZON · PROJECT ENGINEERING
01 / CALCULATION REGISTER02 / DESIGN BASIS & REFERENCES03 / REUSABLE CALCULATION TOOLS
Calculators are presented here as product features.
02 / The workflow
One project.
A clear path forward.
Keep your engineering intent intact as the project moves from site geometry to technical outputs.
TERRAINBOMDXF
01↘
Start with the real site.
Establish the terrain and the boundaries that guide the design.
02↘
Develop the solar field.
Bring fixed-tilt rows and electrical design into the same workflow.
03↗
Take engineering beyond the screen.
Move from a considered layout to BOM and DXF outputs.
The next horizon
Great solar projects
start with better decisions.
Explore the engineering approach behind Horizon Design.
Forever Update: “Horizon will never cost you thousands of euros a year.”