A lot of companies rate their systems in terms of DC. They do this so that you feel that you are getting a larger system for your money. The reason that you should view everything in AC terms is because AC is real production after you factor in conversion losses, heat losses, etc. The other reason is that the CEC rebate is based on the AC rating of a system, not the DC rating. For example: a 2.970 kW system (DC Rated) is the same as a 2.431 system (AC Rated). Production estimates and the rebates are based on the AC rating.
With Net Metering you do not need any batteries. Most of today's systems are grid-tied, which means that they are connected directly to the local Utility power lines. You would only need batteries for stand alone applications or if you wanted emergency power if there was a power outage.
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Silverwood Energy, Inc.San Diego, CaliforniaTel: 619.501.2713---