Quote Check

I have been given an £18,610 quote for:

• 18 x LONGI X10 485w EcoLife solar panels
• Slate roof fixings
• Bird proofing
• Sigenergy Gateway - HomePro SPF
• Sigenergy SigenStor EC 8.0 SP (8.8kW) inverter
• 2 x Sigenergy SigenStor BAT 10.0 (9.04kWh / 8.76kWh usable)
• Scaffolding 2 storey 1 elevation w/ Supporting Platform & Platform Extension

Is this decent? Current annual usage is 7000kw. South east facing roof and all on one roof.

This is with Heatable.