The box says 5. I have 7 on there now. No issues yet.
Green
YES. Plug one end / socket other end for chaining together.
Yes
I have 8 boxes of these lights that I ordered to match the blue lights on my home which are the exact color of the image above. Even the customer photos would match my lights. However, these lights are not blue. These lights are not light blue. These lights are not royal blue. These lights are teal. They are green. I lighted the bushes and porch trees and door garland and flipped the switch. They were so off with the lights on my house that look exactly like this image that I unplugged all of them. Permanently. When I mentioned it to my husband, he said and I quote, "Yeah, I know, I went out and looked earlier." Wherein I replied, "Why didn't you tell me?" and he said, "I didn't want to hurt your feelings." They're teal green.
No
It says a maximum of 216 Watts and each string is 40.8 Watts.
YES. Plug one end / socket other end for chaining together.
I have no idea how much electricity one string uses, however my seasonal electric bill was not significantly higher than expected.
NO. I they never informed me to pick these up. They called (presumably to inform me that they couldn't get these) but they didn't leave a message. To me the call is useless with out the message.