V
String voltage window
Checks hot Vmp and cold Voc against the inverter and MPPT operating limits.
Electrical Engineering
From Array Layout to Electrical Package
Carry the design into stringing, electrical checks, conductor sizing and the single-line diagram. One project model keeps the array, cable schedule, BOM and exported drawing aligned.
IEC & ANSI symbolsRegional conductor logicPDF & DXF output
Electrical / StringingSynced
Roof array / MPPT assignment48 modules
6
Regional electrical packs
21
Electrical component types
IEC + ANSI
Symbol libraries selected by region
PDF + DXF
Drawing exports for review and CAD
01Array to MPPT
String Around the Array You Actually Designed
Modules are grouped by tilt and azimuth before assignment, keeping unlike surfaces apart where MPPT capacity allows. Physical proximity then guides the layout so the electrical plan follows the roof instead of treating it as a spreadsheet.
The optimization stage balances wire length, electrical mismatch and unstrung modules. Designers keep control of the objective—shorter cable runs, production alignment or a balanced result.
Priority 01
Tilt first
Priority 02
Azimuth next
Priority 03
Distance tie-break
MPPT assignment
Three surfaces, three channels
South · 18°
16 modules
MPPT 1
South-east · 24°
16 modules
MPPT 2
West · 12°
16 modules
MPPT 3
02Electrical review
See the Limits Before They Become Drawing Comments
SurgePV brings the electrical checks beside the design decision that created them. Some conditions block an invalid string; others remain visible advisories so the responsible engineer can review and document the exception.
690.9
Reverse-current advisory
Flags parallel-string configurations that require string-level protection review.
A
MPPT current loading
Compares aggregate string current with the MPPT limit, including bifacial current adjustment.
R
DC / AC ratio
Surfaces the array-to-inverter loading range before it reaches the drawing package.
ΔV
Voltage drop
Sizes and reviews DC, single-phase and three-phase cable runs against regional budgets.
M
Mismatch control
Keeps tilt and azimuth groups together where MPPT capacity allows.
Electrical outputs support the design and review workflow. They do not replace approval by the responsible engineer, AHJ, utility or other reviewing authority.
SLD / R0
Commercial rooftop · 100 kW
Cable runs
12
Warnings
0 open
Sheet
A3 · NTS
03Generated documentation
The SLD Comes From the Design—Not a Second Draft
Opening the SLD reads the latest project topology, loads the project’s region pack, places the components and connections, inserts required regulatory annotations, and sizes the cable runs.
Because the drawing, schedule and BOM come from the same model, a design revision has one place to start. The output uses IEC 60617 or ANSI symbols according to the project region.
- Cable schedule with current and voltage drop
- Mandatory-device advisories with cited basis
- Organisation-defaulted title block and revision
- BOM aggregation for cables and devices
04 / Conductor sizing
Regional Logic, Not One Global Assumption
The sizing pipeline applies the active region’s current factor, ampacity and correction tables, voltage-drop treatment, nomenclature and mandatory-device rules.
*US voltage-drop figures are recommendations by default, so the engine warns rather than fails unless the organisation pins them as limits.
| Region | Symbols | Standards basis | DC drop | AC drop |
|---|---|---|---|---|
| India | IEC 60617 | IS / CEA | 1% | 2% |
| United States | ANSI Y32 | NEC 2023 | 2%* | 3%* |
| Germany | IEC 60617 | DIN VDE | 1% | 1% |
| Australia | IEC 60617 | AS/NZS | 3% | 2% |
| South Africa | IEC 60617 | SANS / NRS | 1.5% | 3% |
| United Kingdom | IEC 60617 | BS 7671 | 1% | 3% |
The handoff
A Review Package Your Team Can Keep Working With
Export a client- or reviewer-ready PDF, or take the drawing into a CAD workflow as DXF. Supporting schedules and material outputs stay attached to the same design revision.
Drawing set
SLD, title block, cable schedule and compliance warnings in a reviewable document.
CAD exchange
Layered DC, AC and HT runs with component blocks and labels for continued CAD work.
BOM & schedule
Cable quantities, specifications, lengths and device line items for estimation and procurement.
Looking for storage engineering too?
See how battery sizing and backup requirements stay in the same project workflow.
Can SurgePV replace electrical drafting?
It generates the SLD, cable schedule and BOM from the design, reducing separate drafting and reconciliation. Outputs still require the review and approval appropriate to the project and region.
Does SurgePV export DWG?
The documented CAD output is DXF, alongside PDF and schedule exports. DXF is the exchange format for taking the drawing into AutoCAD and other CAD tools.
Which electrical standards are supported?
Six regional packs cover India, the United States, Germany, Australia, South Africa and the United Kingdom, with regional symbols, conductor rules and voltage-drop treatment.
Frequently Asked Questions
How does automatic stringing group modules?
Modules are grouped by tilt and azimuth first, with orientation and physical proximity used after that. Each group is kept on its own MPPT where capacity allows, reducing electrical mismatch and unnecessary DC cable length.
Which electrical conditions does SurgePV check?
The documented workflow covers temperature-corrected string limits, inverter maximum DC voltage, MPPT current loading, bifacial current adjustment, reverse-current advisories under NEC 690.9, DC/AC ratio and voltage drop.
How is the single-line diagram created?
The SLD is projected from the latest design topology. SurgePV loads the regional symbol and device rules, places components and connections, sizes cable runs, and produces the diagram, schedule and bill of materials from the same project model.
Can engineers edit the generated drawing?
The drawing supports project-level layout and labeling controls, and DXF export provides a CAD exchange file for continued work. An exported DXF does not round-trip back into the SurgePV design.
Does SurgePV guarantee code compliance?
No. SurgePV supports design checks and documentation using regional rules, but the responsible engineer, authority, utility and other project reviewers retain approval responsibility.
Bring Electrical Engineering Into the Design Workflow
See how SurgePV carries a project from array geometry through electrical review, SLD output and the final proposal.
