The cheapest solution for 2000W AC power with some degree of backup capabilty which we could find is as follows:
- 6 solar panels (2700Wp) (300€)
- A simple inverter with a single MPPT Tracker like the Growatt MIC-2000TL (130€) plus a web connector (Shine-LAN box and stick) 25€
- optionally a smart meter SDM630 (60€)
- optionally a battery pack USV like the Fossibot F1200 (400€ with voucher)
Advantages:
Unbeatable price 455 + 60 + 400 + mounting material, TOTAL < 1000€
simple DC cabling (serial connection), voltages not too high (300V)
2000W AC output for many hours, because the six panels will deliver 2000W DC even under moderate sunlight conditions
Simple AC installation (connect to 220V single phase)
Flexible location: device is IP65 protected.
For only 60€ you can control the maximum amount of energy which the system feeds back into the grid.
For additional 410€ you get a USV battery with 1 kWh usable energy. This can supply energy to critical devices for several hours.
Disadvantages
The panels must have free access to the sky (no shading or you will get less energy)
Installing the SDM630 would need work inside the grid box (but this always the case if you need to control the feedback energy flow)
You must care for loading the USV system via selecting the load rate and time manually
You must connect the critical devices (laptop, router, radio, tv, chargers for mobile devices, fridge, etc.) to the power outlet of the USV.