For everything, like lights, plugs, television, DSTV, WIFI, laptops, alarm, CCTV, fridge, washing machine, dishwasher, but exl things like tumble dryers. Continuous power generation during sunny hours feeding your house/office and battery. Battery can charge from the panels and grid.
 
2 × 5kw (10 kw) Deye Hybrid Inverters (NRS Approved)
18 × 450w solar panels
2 × 5.1 kw Lithium Battery
Installation included
COC
5 Year warranty on inverter, 10 year warranty on batteries, 25 year warranty on batteries
 
In perfect conditions, a 10kw inverter provides charging power of 7.2kw = 7200 max watts to the batteries with 18 (450w) panels. In the case of  a power outage for example, if the load is drawing 1 kwh per hour, 2 x 5kw (10kw) batteries will last 10 hours.