How much can you save with plug-in solar in Ireland?

Plug-in solar in Ireland is profitable for one very simple reason: Irish electricity is among the most expensive in the European Union. At a typical retail rate of €0.36 per kWh, every kilowatt-hour your kit produces and you actually use is worth almost double what the same kWh is worth to a German household.

That alone shifts plug-in solar from “nice idea” into one of the highest-return low-risk investments most Irish households will ever make. Here’s the maths.

The four numbers that drive your savings

1. Annual yield (kWh)

For a vertical balcony mount in Ireland, expect roughly 0.95 kWh per W of inverter capacity per year. That’s for the inverter, not the panel — because the inverter clips peak output to 800 W. Orientation matters:

• South: 100% of nominal yield (≈ 760 kWh/year for an 800 W inverter).
• East / West: ≈ 82% (≈ 620 kWh/year).
• North / Shaded: ≈ 58% (≈ 440 kWh/year).

2. Self-consumption %

You only save money on the kWh you actually usein real time (Ireland’s feed-in tariffs for sub-800 W systems are negligible). Without a battery, a typical household self-consumes around 55% of what the kit produces — the rest escapes to the grid uncompensated. With a battery, that climbs to about 92%.

This is the single biggest reason batteries are usually worth it even though they double the upfront cost.

3. Electricity rate (€/kWh)

Ireland averages €0.36/kWh in 2026, with some suppliers above €0.42 on standing tariffs. Each kWh you generate and use is worth that full rate.

4. Up-front kit price

PlugSolar starter kits range from €199 (Lite) to €1,299 (Basic + Battery). Everything is included — panels, microinverter, cable, mount.

What this looks like per kit

Putting the numbers together for a south-facing mount in Ireland:

Ranges span conservative (€0.36/kWh, typical €150/mo household, 55% / 92% self-consumption) to best case (€0.50/kWh standing tariff, high- consumption household, 65% / 98% self-consumption). For your specific situation, run the live calculator.

Lifetime returns

PlugSolar modules carry a 30-year output guarantee (with linear degradation to ~87% capacity at year 25). The microinverter typically lasts 12–15 years; the battery, 10–15 years to 80% retained capacity. Even pricing in one inverter replacement and one battery refresh, the 25-year economics are dramatic:

• PlugSolar Lite (no battery): ≈ €3,400–€6,000 net 25-year return on €199 in.
• PlugSolar Lite + Battery: ≈ €5,100–€8,100 net 25-year return on €749 in (one battery refresh budgeted).
• PlugSolar Basic + Battery: ≈ €4,700–€7,800 net 25-year return on €1,299 in (one battery refresh budgeted).

And those numbers assume electricity prices stay flat. Every historical trend says they won’t.

When does plug-in solar not pay back?

Three honest cases where the maths gets tighter:

1. North-facing only, no battery. A north-facing kit yields ~58% of nominal. Without a battery to shift the self-consumption window, payback can stretch to 3.5–4 years. Still positive — just less spectacular.
2. You’re away most of the day with no battery. Solar peaks at midday. If nobody’s home and there’s nothing running, you’ll donate a lot to the grid. Add a battery.
3. You move every 12 months.Re-installation is quick, but you’ll lose a few weeks of yield each move. Over a 5-year horizon this is still a clear win — over 18 months, marginal.

Why Irish electricity prices make this so attractive

For comparison, the same hardware in Germany pays back in 2.5–4 years because German electricity is cheaper (~€0.28/kWh). In Ireland, the same kWh saved is worth roughly 30% more. The consequence: PlugSolar expects payback periods in Ireland to be the fastest in the EU for residential solar of any kind.

Once Ireland legalises plug-in solar, this stops being theoretical.