We were told to use your electrical goods, dryer etc at night to maximize solar panels. Hubby explained it to me but it went in one ear out the other. So can't help with the why of it. Hehe.
Are you sure you have this right? We have solar and the way it was explained to us is to use the bulk of our electricity during the sunlight hours while the system is generating power, then we are using that rather than buying it back from the grid when we aren't generating power at night. I'd check if I were you as this would significantly change the bill you will get

We have 33 panels, we have a huge house and reverse cycle air con, we had a credit last Qtr and moved it to the gas bill to pay for that. We will likely be in credit most years (however this years heat wave has meant our energy usage has been quite ridiculous, so the next bill will be interesting). We get 25.8c which is pretty decent, we've had our system just over a year. Peekaboo if your bill isn't what you'd expect, I'd ring your solar provider and ask them to go through it with you. I know our first bill was confusing as I didn't realise at first that the electricity we used during the day wasn't factored into the bill, so in essence the 'credit' we received wasn't reflected of the drop in electricity due to us using it during the day while we were generating it - hope that makes sense