NEM-2 has "Non-Bypassable Charges". This means that you pay a small amount for each kWh drawn from the grid that is payable in the billing period. Credits in your annual true-up cannot offset those charges. NEM-1 does not have these charges. That is why people want to stay on NEM-1 as long as possible. In reality, NBCs are not that bad. Since my solar is much too small, I would save a lot more money by expanding my solar system and going to NEM-2.
Yes
the NBCs are around 4 cents/kWh. Sending power to grid at Peak is around 50 cents/kWh depending on your rate plan. During the summar, PWs save me about $200/month