GeoffCapes
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PV are also useful for getting power to places where its difficult to install a cable or the volts drop make it too expensive. Road signs for example. I've dabbled with PV myself and even just charging phones or powering low current items such as the BT WiFi box do reduce the bills.
I also need to recommission the solar hot water system fitted to my roof as raising the temperature of the water from cold to lukewarm will reduce the gas demand to raise it further.
Every little bit helps...
Once our domestic unit is ready (almost is) you can get one fitted to your boiler and it will reduce your gas consumption by 20%. Shouldn't cost more than 200 quid fitted.
As you say, every little helps.