Its taken a while to happen but we now have 17 solar PV panels on our 2 roof piches (SSE/NNW orientation and 15deg pitch) and and a Tesla battery to store any surplus. The PV project had to wait until we'd upgraded the thermal efficiency of our roof, which was costly and time consuming, as our house has no loft space for convenient installation of insulation. So to insulate has required a roof strip and replacement.
Take away from the PV installation:
- Shop around suppliers for advice you are happy with and a good price. Get at least 3 quotes.
- Use an MCS certified Installer. You are likely to need this for insurance / mortgage / SEG tariff purposes.
- Tell your house insurer.
- For roof installation you'll need scaffolding so consider doing any other work required on your roof at the same time.
- Aim to install as much generating capacity as you can afford and the roof will allow. You're likely only doing this once . Consider the benefit vs cost of higher capacity panels.
- You or your supplier will need permission from your DNO for connecting your inverter to the Grid. They will agree to capacity upto about 3.6kWh. Approval for anything higher will depend on the status of your local sub station.
- Allow plenty of lead time for:: i. The installer to schedule the work. ii. The DNO to make up their mind - you should be able to check this online.
- Panel prices and capacities are quite volatile. Check for any changes between quotation and installation.
- Look at warranties for panels inverter and the work. The panels will have separate product and performance warranties. While the panels should have an expected 25 year lifespan its quite possible you'll need to replace the inverter after 10 - 12 years. Consider extending the inverter warranty if its less than 10 years as standard.
And the key question I still have is what will the PP SEG tariff offer for any surplus capacity that my system generates.