 New 1200w Grid Tie Power Inverter 28-52 dc to 220v ac US $269.99 
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 300w grid tie power inverter dc14v-28v / ac110v US $90.00
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 NEW! Fronius IG 2000 Grid Tie Inverter US $1,399.00
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 NEW! Fronius IG 5100 Grid Tie Inverter US $2,499.00
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Can an grid-tie inverter be told to use the battery backup even when the Grid is running?
Outback and some other grid inter-tie inverters have a option to use batteries when the grid goes out. Can I tell the inverter to use the battery back instead even if the grid is on? ( I assume there is a test mode, to make sure everything's working?) I want get a inverter that has this mode so that when electricity is expensive from the grid (I have real time pricing), I can just use my batteries to power the house instead. I don't want to sell any power back to the grid. Just use my batteries when its expensive to buy from the grid.
Thanks for the info!
Absolutely. The SMA Sunny Island will allow you to stay off the grid, even when grid tied, and just connect to the grid based on state of charge, load, time of day. Go to the site below and enter your zip code to find someone near you that sells those things. SMA sells the most reliable inverters in the industry.
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