Realistically, no — not space heating directly off the panels in the Irish climate. The fundamental mismatch is timing: you get most generation in summer when you don't need heat, and least in winter when you need the most. So the idea of running electric radiators straight off solar to heat the house doesn't add up across the year; you'd save a lot in summer (when you don't need it) and almost nothing in the depths of winter (when you do).
What does work is using solar to reduce heating costs indirectly. Surplus solar (or cheap night-rate electricity) can heat your hot water cylinder, and if that hot water also feeds underfloor heating or efficient radiators, you offset some space-heating cost. Pairing solar with a heat pump is the stronger play — the heat pump does the heavy lifting efficiently, and solar plus a battery chips away at its running cost. Many all-electric, heat-pump homes see meaningful offset this way.
The honest framing: solar PV's clearest win is electricity and hot water, with space heating being a secondary, partial benefit best achieved through a heat pump and good insulation rather than electric resistance heating off the panels. If your priority is cutting heating bills, the order is usually insulate first, then heat pump (with SEAI grants for both), then solar to shave the electricity cost — not "panels to power electric heaters."