The engineering toolkit
professionals trust.
Jolt is a professional electrical engineering suite — 35 calculators and certificate templates aligned to IEC, IET, IEEE and HSE standards, with professional PDF export on every tool.
Engineering-grade tools, built for the field
Every tool produces output engineers trust — accurate calculations with professional PDF exports aligned to international standards.
IEC & IEEE Compliant
Every calculation references the relevant international standard — IEC 60092 for marine cables, IEC 60909 for fault current, IEEE 485 for battery sizing. Results you can submit to class, certifiers and clients.
Professional PDF Export
Every tool generates a formatted PDF report — ready for class submission, client handover or site records. No reformatting required.
Marine & Industrial
Tools built specifically for vessel power systems, offshore installations, and industrial plant — including SOLAS emergency power, DP power budgets, and EX area inspections.
From First Principles
Not black-box results — Jolt shows the calculation steps, correction factors, and standard references so you understand exactly how the answer was reached. Suitable for professional sign-off and peer review.
Mobile First
Designed for one-handed use on deck. Large touch targets, clear readouts — built for gloves, engine rooms and low light.
35 tools across 6 categories
From load analysis to RAMS documentation — every calculation and certificate a professional electrical engineer needs.
Electrical Calculations
15 toolsTotal power demand, diversity factor and spare generator capacity across all connected loads.
IEC derating factors, CSA selection and voltage drop verification for LV and marine cables.
Thermal and voltage drop sizing for 3.3 kV to 33 kV XLPE copper cables.
Symmetrical and asymmetrical fault current calculations with series impedance chain.
Minimum CSA calculation, touch voltage and fault loop impedance per IEC 60364.
Starting current, voltage dip and generator impact for DOL, star-delta, soft-start and VFD methods.
Losses, efficiency curves, temperature rise and recommended kVA rating.
Reactive power compensation, capacitor bank sizing and annual savings estimation.
THD-I, THD-V, K-factor and filter sizing per IEC 61000-3-2.
IEEE 485 method for emergency and UPS battery bank Ah sizing.
UPS kVA rating and battery Ah sizing per IEC 62040.
Load sharing, capacity and combined fuel consumption for parallel generators.
Solar, wind, battery and diesel hybrid energy balance and savings estimation.
Three-phase load distribution, imbalance percentage and redistribution suggestions with panel chart PDF export.
Lumen method calculation with SOLAS minimum illuminance reference.
Protection & Coordination
3 toolsDiscrimination checks, I²t coordination and arc flash incident energy estimation.
Selection guidance for MCB, RCD, RCBO, MCCB, ACB and MV/HV circuit breakers.
Temperature rise calculation and ventilation requirements for electrical enclosures.
BS 7671 Certification Forms
6 templatesFull IET model form — Sections A–J, all signatories, supply characteristics, 30-column circuit test schedule.
Certificate for additions or alterations not extending to a new circuit — Sections A–E including AFDD/SPD fields.
Full IET model EICR — Sections A–K, dual declaration blocks, C1/C2/C3 observation tables.
Insulation resistance test records for all circuits — BS 7671 Table 61 (500 V DC, minimum 1 MΩ).
40-item inspection checklist across 12 categories with ✓/N/A outcomes and PDF export.
Portable appliance testing log with visual inspection and formal test records.
Marine & Specialist Tools
4 toolsSOLAS emergency power calculation, DP power budget and bilge pump sizing.
Frame selection and module BOM for Roxtec (RM10–RM40) and MCT cable penetrations with SVG frame visualisation.
Initial and periodic inspection checklists and certificate generation for hazardous area equipment.
Factory Acceptance Test and Site Acceptance Test procedure templates for electrical equipment commissioning.
Reports & Site Tools
6 toolsRisk Assessment and Method Statement with 50+ pre-loaded hazards across 10 categories, company logo support and PDF export.
Site activity log with worked hours, materials used, test results and engineer sign-off with PDF export.
Full cable register with 27-column editable table, sorting, filtering and export to PDF/Excel.
Step-by-step diagnostic procedures, IR test reference values and loop impedance calculator.
Conduit fill, cable drum capacity, gland sizing and busbar design reference tools.
IEC 60364 electrical installation inspection certificate with test results and PDF export.
Reference & Education
1 toolCore laws and quick calculators — Ohm's Law, power triangle, 3-phase, Kirchhoff's laws, reactance, time constants, transformer turns ratio, decibel, voltage drop, energy and running cost.
Compliant paperwork
in seconds
Every compliance document you issue on site — from EIC to EX Inspection — pre-formatted and ready to fill. Complete the fields and export as PDF, no reformatting required.
- Inspection Certificate (IEC 60364)
- EX Inspection Certificate (IEC 60079-17 / ATEX)
- EIC — BS 7671:2018+A4:2026 (Sections A–J)
- MEIWC — Minor Electrical Installation Works Certificate
- EICR — Full IET model, C1/C2/C3 observation tables
- IR Test Record (BS 7671 Table 61)
- Schedule of Inspections — 40-item checklist
- PAT Testing Log (IET Code of Practice 5th Ed.)
Two tools, running live
These are real implementations from the Jolt source code — Load Analysis (IEC 60092-301) and Cable Sizing (IEC 60092).
| Description | kW | PF | Load Factor | Eff. kW | kVA | |
|---|---|---|---|---|---|---|
| TOTAL (after diversity × 0.85) | — | — |
| CSA (mm²) | Base Rating (A) | Derated (A) | VD (%) | Status |
|---|
What the trades say
"The load analysis tool alone saved me hours on our last vessel refit. I can present a class-ready schedule in minutes instead of rebuilding it in Excel every time."
"The certificate templates are exactly the BS 7671 A4:2026 format. I can finish an EICR on site and email the PDF to the client before I've packed up my tools."
"Cable sizing with IEC derating, voltage drop check and PDF export — all in one screen. I recommended it to my whole team on day one."
Ready to supercharge your work?
Join engineers already using Jolt every day on site and on vessel. Free during early access.