Hi,
If I put an on grid solar system in, i.e. panels and a box to connect them to the local grid (no batteries), how does the crediting back for units generated against those used work?
Did you try asking whoever sold you the panels? They should know, or at least know whom to ask. Obviously it's a selling point for their technology.
Anyway, I don't know the details, but it is DEFINITELY POSSIBLE.
I just did very basic google search, and found out that:
The Dominican Republic's net metering scheme... went into effect in June 2011. Commercial and residential photovoltaic projects under the program currently account for about 6 MW in the country, according to Enrique Ramirez, president of the country's National Energy Commission.
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Sofos Dominicana, a subsidiary of Spanish group Sofos Energia, built the $700,000 266.56 kWp turnkey plant atop the Hotel Dominican Fiesta in the capital city. The plant employs 1,088 245 Wp polycrystaline panels made by Germany's Sch?co and 34 7 kW SMA inverters.
The Dominican Republic, along with Mexico, is one of the Latin American countries with the highest volume of photovoltaic net metering. In Mexico, more than 10 MW have been installed under the country's program.
HERE you can find the rest. Obviously, the scheme is working.