Electrical Supply, Power & Autonomy

Main graphic for utility supply, power capacity and autonomy

As modern buildings become fully electrified with heat pumps, EV charging and smart equipment, power management becomes a central design issue. This guide explains how to secure the capacity you actually need without nuisance trips, weak infrastructure or unnecessary fixed utility costs. It covers the single-phase versus three-phase decision, utility capacity upgrades, backup generators, UPS systems and solar self-generation.

This section collects the supporting articles that help you plan stable, scalable and resilient power infrastructure for both homes and demanding mixed-use properties.

Single-Phase vs Three-Phase Installations

This is the first major decision for any property. Learn the limits of single-phase supply, when three-phase becomes necessary and how the utility-side process works step by step.

Single-Phase or Three-Phase?

A practical guide to choosing the right supply by comparing your current and future energy needs.

When a Three-Phase Upgrade Is Required

Heat pumps, wallboxes and simultaneous heavy loads: when single-phase supply reaches its real limits.

Infographic for single-phase versus three-phase installations

Utility Capacity Increase

The process, the required documents and the costs involved when you need a larger available supply.

Can a Single-Phase Home Support an EV?

What works in practice, what the charging-speed limits are and how dynamic management helps.

Downgrading from Three-Phase to Single-Phase

When it makes sense as a cost-saving move and when technical constraints make it a bad idea.

How to Check Which Supply You Have

A quick visual inspection of the panel and meter, useful for beginners, tenants and buyers.

Three-Phase Sockets & CEE Plugs

What the red industrial sockets are used for and how they are connected safely.

Load Distribution & Power Calculation

Behind a stable installation sits accurate power math. This section explains why proper load estimation and phase balancing are essential if you want the system to perform without constant main-breaker trips.

How to Calculate Total Demand

The basics of kVA versus kW, plus practical sizing examples for residential properties.

Correct Load Balancing

Why a three-phase installation can still trip even when total capacity looks adequate, and how to distribute loads properly.

Infographic for load distribution and power calculation

Diversity Factor

The engineer’s shortcut for realistic circuit sizing so systems are not overbuilt without reason.

Dynamic Load Management

How a smart EV charger communicates with the main board and automatically reduces charging current when needed.

Power Factor (cosφ)

What reactive power is, why businesses can be penalised for it and how capacitor banks correct the issue.

Most Energy-Hungry Household Loads

Which appliances draw the highest current and why they require dedicated circuits.

Voltage Drop in Cables

How voltage drop is calculated, how it affects equipment and why it matters over longer cable runs.

Backup Power: Generators, UPS & Voltage Stabilisation

Power cuts and voltage disturbances can shut down work or damage sensitive equipment. This part shows how to organise backup and conditioning systems that match your operational risk.

UPS Buying Guide

Line-interactive versus online topologies and what to choose for PCs, servers and critical household systems.

Voltage Stabilizers (AVR)

A relatively low-cost but effective protection layer for sensitive electronics and inverter-driven equipment.

Infographic for backup systems and power continuity

Choosing a Home Generator

Diesel, petrol and inverter generators compared so you can match the machine to your backup scenario.

How to Size Generator kVA

A practical sizing guide so the genset can comfortably handle emergency loads such as lighting, refrigeration and heating.

Automatic Transfer Switches

How ATS equipment detects grid failure, starts the generator and transfers the load safely.

Manual Grid / Generator Transfer

The legal and technical rules for safe manual changeover without back-feeding the public grid.

Home Batteries vs Generators

Up-front cost, runtime and operational trade-offs between stored electricity and fuel-based backup.

Solar Interconnection & Energy Autonomy

Generating your own electricity is one of the most important long-term investments a property can make. Understand the current regulatory framework, the panel-board requirements and the infrastructure choices that support solar and storage systems.

Net Billing vs Net Metering

What applies in Greece today and how the rule changes affect project economics and payback.

Panel Requirements for Rooftop Solar

Which protections, disconnectors and metering equipment your electrician must add for a compliant connection.

Infographic for solar interconnection and power autonomy

Hybrid Inverters

What they are, how they manage grid, panels and batteries at the same time and why they are central to modern systems.

Connecting Batteries to the Home Panel

AC coupling versus DC coupling explained in practical terms.

Solar Pre-Installation in New Builds

How to route conduits from roof to service spaces during construction for an easier future installation.

Balcony Solar Systems

Are plug-and-play units legal, how do they connect and what should you check in the panel first?

Off-Grid Installations

How to build the electrical and battery side of a remote property with no utility connection at all.

Do You Need Three-Phase for Solar?

The legal power limits for single-phase systems and when a supply upgrade becomes mandatory.

Back to the main guide

See the full pillar map covering panels, supply, lighting, smart home, networks and maintenance.

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Need technical guidance?

If you are planning a new installation or a demanding renovation, contact us for proper design support and coordination of all building networks.