Sunelco, a solar power company in the united states, sells battery storage systems along with power converters (for charging) and inverters (for dc to ac conversion while using the battery power). they also have a unit combining these functions along with the conditioning and switching unit to the commercial power grid. the unit sells in the $1000-2000 range as i remember for a multi kilowatt unit to power a house. to contact them, try 1(800)555-1212 for tollfree information to get their number, or look it up in the Thomas register. if i come across the number i will post it, but my catalog from them is in storage. they provide high power systems for residences, RV's, agriculture and industry. the above mentioned unit is used to sell excess conditioned power back to the utility company, hence the need for clean power and fast switching.
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