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Message: <blockquote data-quote="binky" data-source="post: 558709" data-attributes="member: 490">You would need a small field of solar panels to power the CT. It is possible to do what you want with batteries charged from solar/ or off peak . You are probably better off with just charging batteries in off peak rates, and no solar for that.  You are also probably better off keeping the CT as a separate issue, and possibly as a totally seperate electric supply, the way it pulls power doesn't really suite PV, and this allows it to be run off a different tariff to the rest of the practice. The energy use of the practice will absorb just about everything a roof array can generate on the size of property you describe. Batteries are therefore probably a bit pointless, but it may well be worth installing hybrid inverters to allow battery fitment at a later date to the solar panels. The monitoring software that comes with inverters these days will tell you if that's a viable idea.</blockquote>