Aimed primarily at the residential market, this 4kW Fronius and Trina system will provide for day time usage and also and cover items such as hot water systems or swimming pools. 4kW Solar PV System | Fronius and Trina The Supplier/Installer is trying to tell me that the system will not generate 4kw until mid-summer. I feel I may be being led astray. What I want to know is what sort of daily output other people with 4kw systems are obtaining. Mine is lucky to reach 20Kw per day. I am situated in Nanango, about 200km north west of Brisbane, Queensland. A 4kW Solar Kit requires up to 320 square feet of space. 4kW or 4 kilowatts is 4,000 watts of DC direct current power. This could produce an estimated 500 kilowatt hours (kWh) of alternating current (AC) power per month, assuming at least 5 sun hours per day with the solar array facing South.