Get the VAT back on installations before the end of 2016. Installing solar PV qualifies as a home improvement under the scheme. Solar Electric are an approved contractor so, on projects above €5,000 on your own or a tenanted property, you can reclaim the VAT through your tax code:

Finance Bill (No. 2) 2013 provides for a Home Renovation Incentive (HRI) scheme which will run from 25 October 2013 to 31 December 2016. The incentive provides for tax relief for Homeowners by way of a tax credit at 13.5% of qualifying expenditure on repair, renovation or improvement work carried out on a principal private residence.

For more information see: http://www.revenue.ie/en/tax/it/reliefs/hri/index.html