If the location does NOT have access to an energy source other than a solar PV system, can I use energy appliances with a power capacity larger than that of the system ?

Not possible, unfortunately. It is for this reason that when calculating the power of an off-grid system, all electrical appliances, including their nominal power capacity and hours of usage, are taken into account. If you turn on a device that consumes more than the maximum power of the inverter, it will simply report an error and stop. If the overload is very high, there is a risk for the inverter fuse and even the inverter itself burning out.