1) Batteries tend to be expensive.
2) Need to be maintained.
3) require a battery charger a bit more money
The older Italian program didn't really alllow batteries. At least they didn't provide any money for it. Under the current system with no upfront money from the government I guess you could install the batteries. But I wouldn't. It's wasted money for a grid connect system.
On DIY grid connect systems are connected to the grid. If you screw up you put Enel's grid at risk. They will make sure anything you do is done by fully licensed people. Could you offer to do some of the grunt work? I guess if you find the right installer.
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