Solar panels do not produce significant energy without sunshine, but here’s a breakdown of what happens under different light conditions:

Direct Sunlight (Full Sun)

• Maximum energy production.
• This is the optimal condition for solar panels.

Cloudy or Overcast Conditions

• Reduced energy production, typically 10% to 25% of their normal output.
• Solar panels can still generate power because diffused sunlight (scattered by clouds) still reaches them.

Night time or Complete Darkness

• No energy production.
• Solar panels require photons (light particles) to generate electricity, and these aren’t present at night.

Artificial Light (e.g., street lamps, indoor lights)

Panels might generate a tiny amount of power under very strong artificial light, but:

• It’s extremely inefficient.
• Not practical for real energy production.

Solar panels work by converting sunlight into electricity using a technology called the photovoltaic (PV) effect. Here’s a breakdown of how it works, step by step:

1 Sunlight Hits the Solar Panels

• Solar panels are made up of many solar cells, usually made from silicon, a semiconductor material.
• When sunlight (photons) hits these cells, it energizes the atoms in the silicon.

2. The Photovoltaic Effect

• The energy from the sunlight knocks electrons loose from atoms in the silicon.
• This creates free electrons that start moving, generating an electric current.
• The structure of the solar cell forces electrons to move in a certain direction, creating direct current (DC) electricity.

3. Inverter Converts DC to AC

• Most homes and businesses use alternating current (AC) electricity.
• The DC electricity from the solar panels is sent to an inverter, which converts it to AC electricity.

4. Powering Your Home or Business

The AC electricity can then be:

• Used immediately to power your home.
• Stored in a battery for later use (in solar-plus-storage systems).
• Sent back to the power grid (in grid-tied systems), possibly earning you energy credits (net metering).

5. Monitoring and Maintenance

• Many solar panel systems include monitoring software to track energy production.
• Panels are low-maintenance, but may need occasional cleaning or inspection.

To help you figure out how many solar panels you need, I need a bit more information. Here are the key questions:

1. Your Monthly or Daily Electricity Usage

• n kWh (kilowatt-hours).
• You can find this on your electricity bill.
  Example: “I use 900 kWh per month.”

2. Your Location or Sunlight Hours

• City or region (for solar panel sunlight potential).
• Or tell me your average peak sun hours per day (if you know them).
  Example: “I live in Texas and get 5.5 peak sun hours/day.”

3. Panel Size

What size (wattage) of panel are you considering?

Common sizes: 350W, 400W, 450W, etc.

Example Calculation

If you just want a quick estimate:

Rule of thumb:
For every 1 kW of solar panel capacity, you’ll generate about 4–5 kWh/day in a sunny location.

So:

If you use 900 kWh/month = 30 kWh/day

And each panel is 400W (0.4 kW), producing ~1.6 kWh/day (0.4 × 4)

Then you’d need: 30 ÷ 1.6 = ~19 panels

Inverters are one of the most important parts of a solar power system. Here’s a simple breakdown of what inverters do:

Converts DC to AC

• Solar panels produce DC (direct current) electricity.
• Your home uses AC (alternating current) electricity.
• An inverter converts the DC from your solar panels into AC so your appliances can use it.

Why Is This Important?

Other Functions (Modern Inverters)

Monitoring:

• Tracks your energy production (via app or display).

Safety Shutoff:

• Turns off during a power outage for safety (unless you have a battery + hybrid inverter).

Battery Integration:

• Some inverters work with batteries to store extra energy.

Types of Inverters

Battery storage means storing extra solar energy produced during the day to use later – like at night, during blackouts, or when electricity prices are high.

Key Battery Terms (Quickly Explained)

Common Battery Sizes

You can stack batteries if you need more storage.

For Backup Power (Emergencies)

Think of what you want to run during an outage:

So, a single 10–15 kWh battery can power basic essentials for a day.

For Daily Use (Time-of-Use savings)

If you’re storing solar to use at night:

• Check your evening + night usage.
• Example: You use 20 kWh/day, but only 10 kWh at night → 10 kWh battery is enough.

For Full Off-Grid

• You’ll need 2–3 days of backup, depending on weather.
• Example: 20 kWh/day × 3 = 60 kWh total storage.
• That’s 4–5 large batteries.

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An MPAN number (Meter Point Administration Number) is a unique reference number used in the UK to identify your electricity supply point.

What Is an MPAN Number?

• MPAN = Meter Point Administration Number
• Also known as a Supply Number
• It’s specific to your electricity connection, not to you as a person
• Used by electricity suppliers, network operators, and the National Grid

What Does It Look Like?

It’s a 21-digit number, typically shown like this:

• Example: 01 123 456 7890 1234 567
• On your electricity bill, it may appear under “Supply Number” and be shown in a box like this: S 01 123 456 7890 1234 567

Only the last 13 digits are the unique identifier — the first few digits describe the type of meter and network info.

Where Do I Find It?

• On your electricity bill
• From your electricity supplier
• By contacting your local Distribution Network Operator (DNO)

What Is It Used For?

A DNO stands for Distribution Network Operator — it’s the company responsible for delivering electricity from the national grid to homes and businesses through the local power network.

What Does a DNO Do?

• Maintains local electricity infrastructure – Wires, poles, substations, transformers.
• Delivers electricity to your property – They don’t supply energy, just the connection.
• Fixes power outages – They’re who responds when there’s a local blackout.
• Handles connection requests – New connections, solar installs, battery systems.
• Owns the physical network – Unlike energy suppliers who just sell electricity.

What’s the Difference Between a DNO and a Supplier?

Who Is My DNO?

The UK is divided into 14 DNO regions, served by 6 main DNO companies. Some examples:

You can find your DNO by checking your electricity bill or visiting the site:
www.powercut105.com

When Would I Contact My DNO?

• Power cut or outage
• New connection (home or solar system)
• Upgrading supply (e.g. for EV chargers or heat pumps)
• Relocating your electricity meter
• Grid export approval (if installing solar + battery)

G98 and G99 applications are part of the UK regulations for connecting electricity-generating systems (like solar panels, batteries, or generators) to the grid.

These rules are set by ENA (Energy Networks Association) and are enforced by your local DNO (Distribution Network Operator).

What Are G98 and G99?

G98 – Small-Scale Installations

When to Use:

• You’re installing a solar PV system up to 3.68 kW (single-phase) or 11.04 kW (three-phase)
• Equipment is pre-approved by the DNO (type tested)

Process:

• You can install without prior approval
• Your installer must notify the DNO within 28 days after installation
• Often called a “G98 Notification“

Typical for domestic solar with 1 inverter on a single-phase home.

G99 – Larger or More Complex Installations

When to Use:

• Your system is over 3.68 kW (single-phase)
• You’re installing battery storage that can export to the grid
• You’re using non-type-tested equipment
• You’re installing on commercial or three-phase premises

Process:

• You must apply for permission before installation
• The DNO will assess:
  • Local network capacity
  • Safety impacts
  • Whether any upgrades are needed

Approval can take a few weeks to a few months, depending on the system and location.

“Off-grid” in the context of a solar install means that your property is not connected to the national electricity grid at all — you generate, store, and manage 100% of your electricity independently.

What Is an Off-Grid Solar System?

An off-grid system includes:

• Solar panels – Generate electricity from sunlight.
• Battery storage – Store energy for use at night or during cloudy weather.
• Inverter – Converts solar DC power to usable AC for appliances.
• Charge controller – Regulates power flow to protect batteries.
• Backup generator (optional) – Extra backup for long cloudy periods.

How It Works

• During the day, your solar panels power your home and charge the batteries.
• At night or on cloudy days, your home draws energy from the batteries.
• If batteries are drained and there’s no sun, a backup generator (diesel, LPG, etc.) can be used.

Advantages of Going Off-Grid

Challenges of Off-Grid Systems

Example: Sizing an Off-Grid System

Let’s say you use 20 kWh/day.

You might need:

• Solar capacity: 5–8 kW of panels
• Battery capacity: 30–60 kWh (to cover 1–2 days of no sun)
• Backup generator: Optional, but recommended for resilience

Costs (Ballpark for UK)

Summary

An off-grid solar system is a fully self-reliant setup that powers your home without any connection to the grid — but it needs careful design, sufficient battery storage, and often a backup power source.