MCS-Certified · East Anglia
Still on the Feed-in Tariff? Replace tired panels with sleek new 500W black ones and generate far more — or simply add a battery to use more of what you already make. Either way, your FIT keeps paying. Choose your path below.
Both keep your Feed-in Tariff intact. Pick the one that fits — or do both.
Swap old blue-and-silver for new 500W black panels and roughly double your generation. The big upgrade.
Estimate my upgradeHappy with your panels? Store your spare solar and cheap night power to use when you need it. The simple add-on.
See my battery savingA complete fresh install — latest panels, new inverters, new mounting. Your reliability clock resets to zero.
Older inverters are reaching the end of their warranty and are the part most likely to fail. Replace it before it strands your generation.
Sleek all-black 500W panels look dramatically cleaner on the roof than old blue cells with silver frames.
Carry on earning your FIT generation payments — we protect the registered system so the income keeps coming.
A bigger, more efficient system means more of your own power as grid prices climb — and the option to add a battery to use even more.
Full 10-year product and workmanship guarantee covering both the equipment and our installation.
Two or three taps. No details required to see your numbers.
Fill in the details and hit calculate to see your old-vs-new comparison and indicative price.
This is an indicative estimate based on typical figures for your install year. Your exact system, generation and price are confirmed at your free, no-obligation survey.
Say you've got a 4kWp system on the Feed-in Tariff and you want to upgrade to 8kWp. We keep the first 4kWp running through a new inverter that replaces your old one and feeds the same generation meter — so your FIT carries on exactly as before.
The extra 4kWp runs through a second inverter, on the other side of that meter. It powers your home and battery without touching your FIT-registered generation. You get a bigger, newer system and keep every penny of your tariff.
Your Feed-in Tariff income is fully preservedYour panels are still doing their job, but every sunny afternoon you are giving electricity away. A battery stores your spare solar to use in the evening, and can top up overnight on a cheap night rate to run your home through the expensive daytime hours. Your Feed-in Tariff is completely unaffected. Pick a size to see what you could save.
Indicative savings based on typical East Anglia figures. Your exact saving is confirmed at your free, no-obligation survey.
| New panel rating | 500W black monocrystalline |
| Old panel rating (by install year) | 2012 ≈250W, 2013 ≈255W, 2014 ≈260W, 2015 ≈265W, 2016 ≈270W, 2017 ≈285W, 2018 ≈300W, 2019 ≈320W |
| Generation method | MCS method: kWh/yr = kWp × Kk × shade factor |
| Irradiance (Kk), East Anglia | 1,000 kWh per kWp per year |
| Shade factor | 1.0 (unshaded assumption) |
| Ageing of current system | ≈0.5% reduction per year since install |
These are typical figures used to give you an instant estimate. Your real roof pitch, orientation, shading and panel layout are measured at your free survey.
| Source | Ofgem FIT generation tariff, current year (Apr 2025–Mar 2026), RPI-adjusted |
| Band used | Higher rate, ≤4kW retrofit, EPC D or above |
| Generation rate by install year (p/kWh) | 2010: ~78 · 2011: ~55 · late-2011: ~39 · 2012: 30.0 · 2013: 28.0 · 2014: 24.0 · 2015: 20.38 · 2016: 6.7 · 2017: 6.0 · 2018: 5.2 · 2019: 4.75 |
| Export tariff (deemed) | 5.25p/kWh pre-Aug 2012, 7.39p/kWh after — on a deemed 50% of generation |
| FIT total shown | Generation payment + deemed export payment |
Your FIT income is based on your existing registered system and is preserved through the upgrade — the extra capacity we add sits outside your generation meter. If you know your exact rates, switch on “Know your exact FIT rate?” and enter them for a precise figure — this is always more accurate than our estimate. The 2015 rate is a confirmed Ofgem figure; others are reconciled estimates. Your actual rate is on your FIT statement.
| New 500W black panels | £100 per panel |
| Scaffolding | £50 per panel |
| Old panel collection & recycling | £50 per panel |
| Two inverters (FIT-protecting) | £1,700 (fixed) |
| Labour | £1,200 (fixed) |
| System upgrade & commissioning | £3,500 (fixed) |
| Battery (optional) | Solis Intellihome — 5kWh +£1,800 · 10kWh +£2,600 · 16kWh +£3,100 |
| VAT | 0% — domestic solar PV & battery storage are zero-rated |
All prices are indicative and confirmed in writing after your free survey. No payment is taken through this tool.