A 1000 Amp 2 volt battery cell weighs over 45 Kg and costs over £2000 each. Six would be needed to provide 12 volts but with around 6000 Amps of power!! Ideal for heavy duty commercial and industrial units operating machinery and air con. However, for normal house, shop, office or rural solar installations, its more common to use 12 volt 150-200 Amp batteries. These can be either the cheaper acid batteries, similar to those used in cars or more expensive but zero maintenance sealed units. BUT, an normal car battery will NOT do the job! Solar batteries are 'deep cycle' designed to be discharged and recharged virtually daily. Even a good car battery would only last a few months to a year.
A good quality 12volt 400Ah (4,600Wh) sealed unit battery costs around $900 and weighs over 50 Kg! Listed below are a few examples of batteries used in solar installations using domestic solar deep cycle 120Ah batteries costing about $250 each