COMPREHENSIVE DESIGN SERVICES
Specializing in Solar & Renewable Energy Systems
✅ Technical Reviews & Feasibility Studies
✅ POC & PV Single-Line Diagrams (Armtech format)
✅ Cable Sizing Calculations & Voltage Drop Analysis
✅ Bill of Materials (BOM) Preparation
✅ G100 Compliance & Methodology Reports
✅ Coordination Reports & CPD Settings
✅ DB/SB Arrangements & Custom Panel Designs
✅ Earthing Diagrams & Safe Isolation Procedures
✅ Shutdown & Re-energisation Documentation
SYSTEM SIZES: 50kW to 1MW+
WHY SOLAR INSTALLERS CHOOSE ZESTEC:
💡 Scale up for large projects instantly
💡 Scale down during quiet periods
💡 No recruitment delays
💡 Expert designers from day one
💡 BS7671:2008(2015) compliant designs
💡 Fast turnaround (24-96 hours available)
🚀 READY TO OPTIMIZE YOUR DESIGN COSTS? 🚀
Why Pay £50k+ for a Full-Time Designer?
​
✓ From £500/month - Flexible Retainer Packages
✓ No Holiday Pay, No Sick Leave, No HR Headaches
✓ Cancel Anytime - 30 Days Notice
✓ Hours That Scale With Your Workload
✓ Professional Expertise On-Demand
Transform Your Fixed Costs Into Variable Savings
THE HIDDEN COST OF FULL-TIME EMPLOYMENT
Average Electrical Designer: £50,000/year
​
+ Employer NI (13.8%): £6,900
+ Pension (3% minimum): £1,500
+ Holiday Cover (28 days): £5,400
+ Sick Leave: £2,000+
+ Training & Development: £1,500+
+ Equipment & Software: £2,000+
+ Recruitment Costs: £5,000+
──────────────────────────
TOTAL REAL COST: £74,300+/year
​
And you're still paying when they're not designing...
• Holidays
• Sick days
• Training days
• Quiet periods
• Lunch breaks
​
Fixed costs. Zero flexibility.