Message from discussion new idea

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Subject: new idea
From: "m...@weathersystemsonline.co.uk" <m...@weathersystemsonline.co.uk>
To: Solar Chat Plus <solar-plus@googlegroups.com>
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I was wondering if it was possible to use a inverter connected to a
battery that feeds power to a battery charger via an controller that
in turn tops up the battery thereby if my calculations are right, the
battery never run down and yet get about 150w spare capacity from an
300w Inverter  (FREE ELECTRICITY)?