Best place to look for a company to deal with for stand alone solar is searching for companies that service areas where
linking to the grid in your state is expensive and then searching for suppliers of the same brands closer to you or use
'stand alone solar' in your internet solar search efforts. some local companies that I trust
http://solardepotbellingen-px.rtrk.com.au/
http://solardepotbellingen-px.rtrk.com.au/stand-alone-power
SA company below looks good. Solar water pumps are pretty well the 'new" technology at the moment
http://www.energymatters.com.au/stand-alone-power/
A reputable company will advise you to also install a back up generator to fully charge the batteries and use it
regularly.
Solar cells on their own cannot fully charge storage batteries.
Battery bank size is dependant on draw and also governs the 'bump' charge required.
You can easily 'experiment' cheaply now using led globes, a voltage regulator with diode and just a vehicle battery
although they are not really designed as a storage battery ( and need regular bump charging to remain effective).
Real storage batteries are quite expensive.
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