The Grid-Free installation is the name for the 100% self-consumption
installation using the GRID-TIED inverters.

See the explanation about GridFree instalation here:
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The basic GridFree principles:
http://gwl-power.tumblr.com/post/36758416239/micro-inverter-is-micro-good-ideas-for-you-with

Micro-Inveter Opens the GridFree World:
http://gwl-power.tumblr.com/post/36819163787/micro-inveter-opens-the-gridfree-world-standard

GridFree technology to reduce your energy demands:
http://gwl-power.tumblr.com/post/37061277055/gridfree-technology-to-reduce-your-energy-demands

The Grid-Free (Grid-Tied) inverters do not work in an island (off-grid) mode.

Please see this:

Can the Micro-Inverter work in off-grid mode (island mode)?
http://gwl-power.tumblr.com/post/37583550069/the-micro-inverter-safety-and-operation-faqs-q

Can the MicroInverter work as stand alone inverter? (in an island mode).
http://gwl-power.tumblr.com/post/38550983828/faq-microinverter-questions-and-answers

Please see the overview of the Grid-tied MicroInverters and GridFree
technology at these links:
http://www.ev-power.eu/Micro-Inverters

http://www.ev-power.eu/GridFree-Inverters

The summary: the GRIDFREE is a GRID-TIED technology that operated
WITH the GRID. It works from the the solar panels directly, with no
need for batteries.