WIFI extender that works like 200 or 300 feet?

Update: We have solar panels running our home now, but we need to get WIFI to the control box so then we can monitor the panels and the amount of electricity produced right on our phones. Plus with wifi the company can monitor the panels and make sure things are working properly. Any suggestions for a wifi, possible range... show more We have solar panels running our home now, but we need to get WIFI to the control box so then we can monitor the panels and the amount of electricity produced right on our phones. Plus with wifi the company can monitor the panels and make sure things are working properly. Any suggestions for a wifi, possible range extender that could reach like 200 or 300 feet?
Update 2: Maybe it's more, what is a good solution to get wifi to that spot without getting another modem from the ISP.
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