Before purchasing an inverter make sure that it is going to fit your system. The capacity of an inverter is measured in Watts. Generally, you would want your inverter to be equal or close to the DC rating of your solar array.
For example, if you install a 7 kilowatt solar PV system, the inverter needs to be around 7kW, plus or minus a small percentage. Inverter manufacturers usually specify sizing guidelines for the array capacity their inverters can be paired with on their product specification sheets.
If the DC rating of the solar array is more than 50% bigger than the capacity of the inverter, so called "clipping" starts: the inverter limits the incoming energy which results in power losses of the whole system.
Be especially careful when choosing inverters for commercial use. They have a higher load capacity than residential grade inverters and must be certified to handle adverse operating conditions. Fronius Symo Advanced 10kW
is exactly the kind of inverter you need: it is field serviceable, compliant with all the relevant standards and comes with a 10 year warranty.