You can get 320-watt of new solar panels from $0.15-0.20/watt. The minimum order is 10,000 watts, so that means you need to spend at least $1,500 — suppose you’re paying $0.15/watt. Even if you pay $0.20/watt, you’ll still spend less than what you’d pay for 8,400-watt of used Solar World USA solar panels.