Or Wind or some other form of distributed generation.
For a solar scenario, peak solar generation is not synced with peak demand. The battery charges from solar during the day and is dispatched for use when you get home from work. At this stage, it won't make a household completely energy independent, but it's a large step towards that. The cost is $3500 USD for one unit. Based on my power consumption and exchange it will take 125 months to pay for itself.
It's that kind of economics that has affected the penetration in my opinion. This system is a game changer in the sense that this makes the home storage solutions more accessible. That should push the installation price down which makes it more appealing to more people which drives the price down further.
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