Sussex is one of the best places in the UK for solar energy. With around 1,900 hours of sunshine per year and a mild southern climate, panels here consistently outperform systems further north. But getting the most from solar isn’t just about sticking panels on a roof — it comes down to the right system design, sensible energy habits, and understanding what’s actually going to move the needle on your bills.
Here’s a practical guide to maximising your solar investment.
Start with Your Energy Usage, Not Your Roof
Most guides tell you to start by looking at your roof. We’d say start by looking at your electricity bills.
Understanding how much energy you use — and crucially, when you use it — is the single most important factor in designing a system that delivers real savings. A household that uses 3,000kWh per year has very different needs to one using 5,000kWh, and a family that’s home during the day will get more from solar than one where everyone’s out until 6pm.
Before we design any system, we look at your actual energy patterns. This determines the right system size, whether battery storage makes sense from day one, and how quickly the whole thing pays for itself.
Getting the System Size Right
Bigger isn’t always better with solar. An oversized system generates more electricity than you can use, and while you’ll earn something by exporting the surplus, export rates are a fraction of what you pay for grid electricity. You want a system that’s well matched to your consumption.
As a rough guide for Sussex homes:
A 3–4kW system (7–9 panels) suits smaller households or properties with limited roof space. A 4–5kW system (9–12 panels) works well for average family homes. A 5kW+ system makes sense if you have high electricity usage, an EV, or a heat pump — anything that increases your daytime demand.
Each panel occupies roughly 2 square metres of roof, so the amount of usable space you have will set the upper limit. We assess all of this during a site survey and recommend a size based on your property, not on hitting a sales target.
Roof Orientation and Shading
Your roof’s compass direction affects how much electricity your panels generate, but modern panels are efficient enough that perfect south-facing orientation is no longer essential.
South-facing delivers the highest total generation. East/west split arrays can actually work better for some households, spreading generation across a longer part of the day rather than peaking at midday. East or west only still performs well, typically producing 15–20% less than due south. North-facing is generally the only orientation we’d advise against.
Shading has a bigger impact than most people realise. A single chimney shadow or overhanging tree branch falling across one panel can affect the output of the entire string. During every survey, we carry out a detailed shading analysis and design the panel layout to minimise the impact. Where shading is unavoidable, we fit panel-level optimisers so each panel operates independently.
Use Your Solar Electricity — Don’t Just Export It
This is the most valuable piece of advice in this entire article: use as much of your generated electricity as you can.
Every unit you use yourself saves you the full retail electricity rate — currently around 25–28p per kWh. Every unit you export earns you somewhere between 4p and 15p, depending on your tariff. The maths is simple: self-consumption is worth roughly twice as much as exporting.
Practical ways to increase self-consumption:
- Run your washing machine, dishwasher, and tumble dryer during daylight hours
- Charge your EV while the sun is up if you’re home during the day
- Use timers to schedule high-draw appliances for midday when generation peaks
- Heat your hot water during the day using a solar diverter (which sends surplus electricity to your immersion heater)
- Add battery storage to capture daytime surplus for evening use
When Battery Storage Makes Sense
If you’re out during the day and use most of your electricity in the evening, a battery transforms the economics of solar. Instead of exporting your daytime surplus at a low rate, you store it and use it when you’d otherwise be paying full price for grid electricity.
A typical home battery costs £3,500–£5,500 and can increase your self-consumption from around 30–40% to 70–80% or more. For the right household, this makes the overall system significantly more cost-effective despite the higher upfront investment.
Batteries also unlock savings without solar. Using an off-peak tariff like Octopus Go, you can charge the battery overnight at a low rate and discharge during the day, shaving hundreds off your annual bills.
We don’t push batteries on every customer. For some households — particularly those who are home during the day and can naturally use most of their generation — the payback on a battery is longer than on the panels themselves. We’ll give you an honest assessment of whether it makes sense for your situation.
Preparing Your Home Before Installation
Getting the most from solar means making sure the rest of your home isn’t wasting what you generate. It’s worth addressing the basics before installation:
Insulation. If your home is losing heat through the walls, loft or floors, fixing that first means you need less energy overall — which means a smaller, cheaper solar system can cover a larger share of your needs.
Draughts and air leaks. Sealing gaps around windows, doors and pipework reduces the amount of energy your home bleeds away.
Old appliances. If your boiler, fridge or other heavy-use appliances are nearing end of life, replacing them with efficient models reduces your baseline consumption and makes your solar investment go further.
Roof condition. If your roof needs work in the next few years, do it before the panels go on. Removing and reinstalling panels later adds unnecessary cost.
None of this is compulsory, but a more efficient home means solar has a bigger proportional impact on your bills.
Financial Support and Export Payments
The Smart Export Guarantee (SEG) pays you for every unit of surplus electricity you export to the grid. Rates vary between energy suppliers — anywhere from 1p to over 15p per kWh — so it’s worth comparing before you sign up. Your SEG provider doesn’t have to be the same company as your electricity supplier.
To qualify, your installation must be MCS certified and you’ll need a working smart meter. All of our installations are MCS certified as standard, and we’ll help you get set up with the best available export tariff.
Depending on your circumstances, there may also be local grant schemes or funding programmes available, particularly for lower-income households. We can advise on what’s currently available during your survey.
Choosing the Right Installer
This matters more than most people think. A well-designed, properly installed system will outperform a poorly designed one for the next 25 years. A few things to look for:
MCS certification is non-negotiable. Without it, your system won’t qualify for SEG payments. Every installer should have this — if they don’t, walk away.
NICEIC or equivalent electrical approval means the company is qualified and regularly assessed on its electrical work.
Directly employed installation teams mean consistent quality and accountability. Companies that subcontract to whoever’s available can’t guarantee the same standard.
Detailed site survey before quoting. Any installer offering a price over the phone or from a satellite image alone is cutting corners. A proper survey assesses shading, roof condition, electrical infrastructure and your energy usage.
Clear, written quotes that include everything — scaffolding, electrical work, any roof modifications, commissioning and paperwork for your SEG registration.
Get at least three quotes, and be cautious of prices that seem too good to be true. Cheap installations often mean cheap components, rushed workmanship, or both.
The Bottom Line
Solar panels are a strong investment for most Sussex homeowners with a suitable roof. But the difference between a good solar investment and a great one comes down to getting the details right: the correct system size, smart panel placement, sensible energy habits, and honest advice on whether battery storage is worth it for your specific situation.
That’s what we focus on. Every system we install is individually designed, installed by our own team, and backed by proper aftercare. No off-the-shelf packages, no hard sell, no subcontractors.
Greener Solar Solutions is the dedicated solar energy brand of A Greener Alternative. MCS certified, NICEIC approved, and serving Sussex, Surrey, Hampshire and Kent.
