AIR-X 400W with charge controller = 756,00 Euro
Whisper 1000 W, charge controller = 2869,00 Euro
Whisper 3000 W, charge controller = 7303,00 Euro
Normally you could use now a solar battery bank with simplest inverter.
With the complete system BlackoutBlocker 1.0 you will have:
+ a battery charger
+ online UPS 30 A with automatic transfer switch single phase
+ inverter up to 5000 Watt (1,5 peak)
+ battery charge controller = complete backup.
Price = 5.500 Euro
Additional is required a AGM battery bank.
The smalles starts @ 100 Ah, 2 x 12 V DC = 2 x 253,00 Euro
2 x 200 Ah = 2 x 458,00 Euro
Larger banks are also available.
Largest at one Blackoutblocker = 800 Ah.