1. Executive Summary & Objective
Goal: Offset daytime/peak grid energy consumption using PV solar, inverter, and battery storage.
Peak Demand: Measured peak load is 25 kW.
Operational Focus: Maximum energy cost reduction/offsetting (given low local grid downtime), but with a minimum of 12 hours autonomy provided by the battery system.
Scalability: The system architecture must allow easy expansion in capacity (inverter power, battery storage, and additional solar PV) in future phases.
2. Site Details & Physical Layout
Address: 91 Newton Road, Meadowdale, Germiston
Location Links:
Google Maps Link: https://maps.app.goo.gl/wFMW8cRXGwCv6rdN8
What 3 Words Link: https://w3w.co/toolkit.original.faster
Designated Locations (Refer to Site Plan):
Red Zone: Main Electrical Switchboard / Grid tie-in point.
Yellow Zone: Inverter & Battery location (Option A).
Purple Zone: Inverter & Battery location (Option B).
Orange Zone: Ground mount structure PV Module area (Option A).
Blue Zone: Roof Mount PV Module area (Option B).
Note: Bidders may submit alternative layout designs/locations if supported by strong technical or architectural advisory.
Site plan:
3. Technical Specifications & Requirements
Component / Parameter
Requirement / Specification
Notes / Expansion
Grid Connection
Main breaker downgraded to 125A
Application already submitted to local supply authority.
Inverter System
30 kW Hybrid Inverter
Sigenergy or equivalent tier-1 brand; must support modular scaling.
Battery Storage
Min. 12 hours autonomy
Must comfortably support critical/essential baseload over a 12-hour window.
Environmental Protection
IP65 Rated
If non-IP65 equipment is proposed, a dedicated weatherproof housing/enclosure must be included.
PV Solar Array & Mounting
Ground mount or Training Centre roof
Subject to structural engineering approval to be arranged through contractor.
4. Mandatory Legal & Compliance Requirements
All participating contractors must provide proof of:
Compliance with all relevant national and local electrical regulations (e.g., SANS 10142-1, NRS 097 grid interconnection standards, local municipal solar PV bylaws).
Registration as a Registered Electrical Contractor (Department of Employment and Labour / DoEL).
Registration with the National Bargaining Council for the Electrical Industry (NBCEI) where employees are utilised.
Active membership in good standing with ECA(SA).
5. Key Submission Dates & Contacts
Site Visit & Pre-Bidding Briefing: Monday 23 November 2026 at 10AM in the Main Boardroom at 91 Newton Road.
Submit itemized quotations and proposals to Anthony Schewitz via email at anthony@ecasa.co.za.
Submission Deadline: 7 December 2026
Results Announcement: 11 December 2026
