How do I know that I'm getting the panels I paid for on the day of installation?

If, for whatever reason, you're concerned that your installer might quote you one panel brand and then on the day of installation switch it out for another brand, your panels will have a label on the back that gives their make, rating, and a barcode and number that identifies the specific panel.  

You can check this to make sure you are getting the panels you have ordered.  If you have a reason to be suspect the labels may be counterfeit, you can take photographs of them and check with the manufacturer to confirm the panels are genuine.  

If you are getting solar through an installer we referred to you, you can be extremely confident you are getting what you have paid for.