Dave,
Based on your questions, I take it you have a Heart Interface Freedom 15 "plus" the Link 1000 Control center. The buttons you refer to are only on the Link 1000 Control Center. The main unit is described in the Freedom Inverter Owners manual (
http://www.xantrex.com/documents/Dis...ner_manual.pdf). Use of the Link 1000 unit is described in a seperate manual (
http://www.altestore.com/store/Meter...er%20Guide.pdf)
Operation on the main unit capabilities is under control on the Link 1000. This means you have to understand the capabilities/featues of the main unit and then use the Link 1000 manual to uderstand how those capabilites are controlled.
For your first question "Is it a fully automatic charger?" the answer is Yes (main manual page 13) as long as the LED above the Charge/PWR Share button is lit (Page 40 of the Link 1000 Manual) on the Link 1000.
"Do you need to have the green led lit at the charge button for charging to start?" Yes (Page 40 of the Link 1000 Manual).
I suspect you did not know about the Link 1000 manual and the remote described in the main manual does not have the button you asking about.
Dave