Solar system with battery inverter design

Having spent quite a bit of time in South West Asia, I recall that larger "high tech" batteries were exceptionally expensive while the more common lead varieties were quite affordable. Assume my premise to be correct, your most likely choice would be a lead-acid battery, and I would recommend either a gel-pack (GEL) or an absorbed glass mat (AGM) as these tend to have much better life cycles and are significantly safer and simpler to maintain. That said, like all improvements they have an associated cost above a basic lead-acid battery. In any case of using a lead-acid battery system, I always recommend a vented storage box to help protect the batteries and to protect the people.

Depending on your design, you could use a 12, 24 or 48 volt system. Because of your local AC base voltage (220V @ 50Hz) I would normally lean towards the 24V system for an inexpensive design for your type of high cycle rate short draw use. It generally would provide a good blend of economy, efficiency, and longevity. That said, if you think you might wish to expand your future use/demand on the system, I would strongly recommend starting with a 48V battery system design. It may cost slightly more initially, but is almost always significantly cheaper than a later upgrade. It would also have a longer life cycle and handle your relatively rapid burst demands more effectively. Of course all this depends on the design of the rest of the solar system, most especially the charge regulator and the inverter.