Solar Panels Guide 2024

Solar Panels Guide 2024

Solar Panels Guide: How much do solar panels cost?

• Our best 10 all-black solar system & battery storage starts from £5,499 (10 all black solar panels (430w), Alpha ESS 3.6kW inverter, Alpha ESS 5.7kWh battery, full installation, MCS Certification).
• A typical 4kW system suitable for an average 3-bedroom home costs around £5,000 – £7,000
• Costs break down to roughly £2,246 per kWp installed.

System Sizing:

• A 3kW system for a small 1-2 bedroom home costs around £4,000 – £7,000
• A 4kW system for a medium 2-3 bedroom home costs £5,000 – £9,000
• A 6kW system for a large 4-5 bedroom home costs £8,000 – £13,000

Cost Factors:

• Type of panels (monocrystalline or polycrystalline)
• Installation complexity (roof type, cabling, etc.)
• Adding battery storage (£2,500 – £10,000 extra)

Potential Savings:

• Annual savings range from £440 for a small home to £1,005 for a large home.
• Most households can expect to break even in 10-15 years after installation. This can be reduced by adding a battery and pairing it with a smart tariff.
• Government incentives like Smart Export Guarantee help increase savings. Many tariffs now pay more than 8p/kWh for exported electricity

So in summary, a typical UK homeowner can expect to pay £5,000-£10,000 for a solar panel system sized for their home’s needs, with potential annual savings of hundreds of pounds and a payback period around 10-15 years with available incentives (solar panels guide).

What’s the right number of panels for my home?

• Your budget
• The size of your home (number of bedrooms)
• Your household’s annual electricity consumption

Remember, with export rates higher than 8p/kWh it can actually pay you to oversize your array and fit as many panels as you can.

Here are some general guidelines on the recommended number of solar panels based on home size:

Small Home (1-2 bedrooms)

• Average annual electricity usage: 1,800 kWh
• Recommended number of solar panels: 4-8 panels (350W or 450W each)
• Typical system size: 2-3 kW

Medium Home (2-3 bedrooms)

• Average annual electricity usage: 2,700 kWh
• Recommended number of solar panels: 8-13 panels (350W or 450W each)
• Typical system size: 4-5 kW

Large Home (4-5 bedrooms)

• Average annual electricity usage: 4,100 kWh
• Recommended number of solar panels: 13-16 panels (350W or 450W each)
• Typical system size: 6 kW

However, for a more accurate estimate, you should calculate your specific household’s annual electricity consumption from recent energy bills, remember you electricity consumption may increase in the future as you electrify your home heating and swap over to an electric vehicle. This will give you a better idea of the system size (kW) and number of solar panels needed to meet your energy needs. Other factors like roof orientation, shading, and panel efficiency can also impact the ideal number of panels.3 It’s best to consult a solar installer who can properly assess your home’s conditions and energy requirements to determine the optimal solar panel system size.

What Factors impact solar panel costs

System Size

The size of the solar panel system, measured in kilowatts (kW), is one of the biggest determinants of cost. Larger systems with more panels are more expensive than smaller systems.

Panel Type

The type of solar panels used affects the cost:

• Monocrystalline panels are the most efficient but also most expensive.
• Polycrystalline panels are less efficient but more affordable at 10 to 15% less than Monocrystalline panels.
• Thin-film panels are the least expensive but require more space and are less common for residential use.

Installation Complexity

Time is money as the say so more complex installations involving specialized mounting systems, electrical work, permitting etc. will increase labor and overall costs.

Location

Geographic location impacts costs due to factors like sunlight exposure, temperatures, local labor rates and regulations.

Additional Components

Adding components like inverters, battery storage systems or specialised mounting racks will add to the upfront costs.

Efficiency

While more efficient panels cost more upfront, they can produce more electricity over their lifespan, potentially offsetting the higher initial investment.13So in summary, the system size, panel technology, installation requirements, location factors and any additional components are the main variables that impact the total cost of going solar for a UK homeowner.

Solar Panels Guide: Breakdown of Installation Costs

Solar Panels

• Cost range: £600 – £800 per 350W panel
• For a 3.5kW system (10 panels): £6,000 – £8,000

Inverter

• Converts solar power to usable electricity
• Typical cost: £1,000 – £2,000

Racking/Mounting System

• The hardware to securely mount panels on your roof
• Cost range: £2,000 – £4,000

Electrical Work

• Wiring, safety switches, meter installation
• Estimated cost: £500 – £1,500

Installation Labour

• Professional installation by certified solar company
• Included in total system cost quotes

Additional Components (Optional)

• Solar battery storage: £2,500 – £10,000 1
• Specialised mounting systems: Varies

So in summary, for a typical 3.5kW solar panel system suitable for a 3-bedroom home in the UK, the total installation cost ranges from around £5,000 on the lower end to upwards of £10,000 when adding battery storage or more premium components.

Solar Panel Maintenance Costs

Annual Maintenance Costs

• The average annual cost for basic solar panel maintenance in the UK ranges from £100 to £300.
• This typically includes cleaning, inspection, and any minor repairs needed.

Cleaning Costs

• Having solar panels professionally cleaned can cost £4 to £15 per panel.
• For a typical residential system with 10-12 panels, cleaning would be around £40-£180 if done semi-annually.

Inverter Replacement

• The inverter, which converts solar power to AC electricity, needs replacing every 25 years on average.
• Replacing the inverter can cost between £800 to £1,000.

Professional Servicing

• It’s recommended to have a professional solar company service the system every 10-15 years for an “intermediate” or “full” maintenance check.
• The cost for this type of professional service visit is typically £100-£200.

Long-Term Costs Example

For a 10-panel system over 30 years: £3,000 for 3 professional services + £300 for annual cleaning/inspection = Around £3,300 total maintenance cost.
So in summary, UK homeowners can expect relatively low annual maintenance costs of £100-£300 for cleaning and inspection. But they should also budget for inverter replacement around £900 every 25 years and professional servicing every 10-15 years at £100-£200 per visit for optimal long-term solar panel performance.

How Much Will Solar Panels Save Me

Okay, let’s calculate the lifetime savings for your solar panel system over 25 years with the following assumptions:

• 4kWp system installed
• Current electricity price: 26p/kWh
• Annual electricity price increase: 5%
• Current export tariff rate: 8p/kWh
• Export tariff increase: 5% per year (in line with electricity costs)
• Year 1 solar generation: 3,500 kWh
• Annual degradation: Loses 40 kWh generation per year
• You use 50% of generation and export the other 50%

Year 1:

• Solar generation = 3,500 kWh
• Self-consumption = 1,750 kWh x 26p/kWh = £455 savings
• Exported = 1,750 kWh x 8p/kWh = £140 income
• Total Year 1 Savings = £595 Year
• Solar generation = 3,500 – 40 = 3,460 kWh
• Electricity cost = 26p x 1.05 = 27.3p/kWh
• Export rate = 8p x 1.05 = 8.4p/kWh
• Self-consumption = 1,730 kWh x 27.3p/kWh = £472.49
• Exported = 1,730 kWh x 8.4p/kWh = £145.32

Year 2:

Total Year 2 Savings = £617.81Continuing this calculation with 5% annual electricity/export price rises and degradation of 40 kWh/year:Total 25-Year Lifetime Savings = £24,958This breaks down to:

• Electricity bill savings over 25 years = £19,241
• Export income over 25 years = £5,717

Solar Panels Guide: A few key points:

• The degradation reduces the annual generation and associated savings each year
• The 5% annual price increases help offset the degradation impact
• Electricity bill savings make up 77% of the total lifetime savings
• Export income contributes an additional 23%

So with a starting solar generation of 3,500 kWh in year 1, degrading by 40 kWh annually, and assuming 5% yearly increases for electricity/export rates, the total estimated lifetime savings over 25 years with 50% self-consumption and 50% export would be approximately £24,958. This lifetime savings factors in both the electricity bill reductions from self-consumed solar power as well as the supplementary income stream from exporting excess generation. Are you ready to start producing free, green energy? Contact us now!

Author: Jim Laidlaw, CEO & Founder at Boxergy

Visit Jim’s LinkedIn profile.