I purchased a 20W solar panel but what arrived was a 10W solar panel. I contacted the seller who lied and told me I have a 20W solar panel but that I don't know how to measure it. Well that got off to a good start. I filed a refund with Aliexpress and the whole system is clearly aimed toward not giving refunds. They're asking me to submit more information but not providing a way to submit more information. I had an email that said the seller had agreed to my terms and that I should press accept. When the screen came up, the only accept button was to accept the seller's terms. Dishonest, do not do business with these crooks. I'm going to try to do a chargeback via the bank now. Sure - it wasn't much money but it's the principal of the thing.