Only way to know for sure is do a twelve month energy audit. What is the actual power consumption of that airconditioner each month ?
How many totally cloudy days when solar is effectively zero ?
Is this mobile office occupied or used at night ?
Do you plan to have a backup power source (grid, gasoline generator etc..) ?
How much roof area is available for solar ?
Only when you have this all figured out can you plan a system to suit your needs.
An inverter big enough to handle maximum demand, including surge power.
A battery big enough to handle cloudy days, and that will also depend on your backup power source.
And enough solar panels to generate monthly measured power consumption at your location.
When you have a workable system design on paper, its time to start costing out and sourcing the parts.
Many peoples expectations are wildly optimistic on what solar can actually do, and hugely underestimate their actual consumption and costs.
Its no good building a $6K system that stops working every time a cloud covers the sun, or needs an expensive battery replaced every twelve months, because it was never maintained and simply flogged to death. Get the facts, do the research, then cost it all out.
