Not necessarily. The 2026 grant is up to €1,800 (€700 per kWp for the first 2 kWp, plus €200 per kWp up to 4 kWp). The 2027 level is expected to change, but nothing is confirmed until Budget 2027 on 6 October 2026, so treat any 2027 figure you see before then as a forecast.
What matters is your grant offer. The rate that applies to you is the one in the offer SEAI gives you, and you then have 8 months from the offer to complete the work. So if you're otherwise ready, choose an SEAI-registered installer, apply and get the offer, then get the job and the paperwork (including the post-works BER) done inside the 8 months. Installers get busy and storms can push installs back, so build in some buffer rather than aiming for the last week. It isn't a reason to rush a decision you're unsure about.
The grant stacks with the 0% VAT on domestic solar, and a battery supplied and installed with the panels under the same contract also gets 0% VAT, though the solar grant doesn't fund it. A €600 battery grant is also expected in the Budget, but it isn't confirmed and its rules aren't published yet.