Quoted: They are expensive to buy need lots of batteries plus you need direct current lights and whatever or a conversion device
panels need cleaned a lot - dust bird crap snow
In general cost more than electric and are a pain to maintain
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You do need an inverter but you do not need batteries which can add 25% to the cost of a setup. Your power will be generated during the day, when the load is the greatest. For actual power outages buy a generator, more practical.
In some states net metering/buyback is law but the power companies can often decide how generous they want to be. Some aren't bad to deal with. If you own a business you can make it much more cost effective due to depreciation scheduling and other tax breaks and incentives.
Solar shingles while nice for some applications, do need to be cleaned as cynide pointed out and this can be a pain if you have a high roof and I am not sure if you can walk on them if you need to get on your roof, not mention they would be slippery as hell.
Taking steps to make your house more energy efficient will cost 1/6th the money as provide the same benies than going solar and keeping you inefficient lights/appliances. Go to HD or lowes and get some packs of compact flourescents of differnat wattages. They make 3 way compacts but not varitable ones for dimmers AFAIK. Put good weather stripping around doors and windows, replaced single pain or other crap windows etc. I believe you can also deduct home improvements so new windows, hot water tank, furnace boiler etc would allow you to double dip on the front end and back end.
S.O.