The good thing with generating your own electric us that it can be used for any purpose. Where hot water for a parlour is required we install biomass for heating the parlour water and then also feed t farm house which qualifies for the commercial tariff. We have also used the biomass to provide hot air for the parlour for winter. Just enough to stop freezing but it also depends on the design of the parlour. It is very difficult to use 100% of power generated. With carefull planning you can get close. The present technology of solar is up to 20% efficiency the world over. Better ones will be coming but not at the moment.