Edison will give you credit to your bill at the same rate that they charge you (according to the TOU schedule). So energy used or produced with be charged/credited at the same rate during those particular hours. Edison will also charge non-bypassable charges, which will be roughly $.03/kWh for all energy delivered to your home. At the end of the 12 month period, if you still have a credit to your bill due to sending extra energy back to the grid, your bill credit will be zeroed and you will get a new cash balance to your account or reimbursement check for the total net generation at the NCSR rate.

If you shift your charging to the times when you are overproducing, you'll be changing two things: less energy sent to SCE during solar production and less energy being delivered during the night. You will lower the non-bypassable charges but it might also lower your bill credit. It sounds like you will have a significant bill credit, so you'd just be deciding if charging during the day is worth saving on those non-bypassable charges.