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RetrofitReady is a free information service. We are not affiliated with SEAI or any government body. Grant figures are indicative only and may change without notice. Always verify current rates and eligibility at seai.ie before signing any contract or starting any work. We do not endorse or guarantee any contractor listed on this site.

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Solar Panel Upgrade Calculator

Already have solar? See how much more you could save by upgrading to higher wattage panels.

Co. Waterford gets 1,150 kWh/kWp/year

Upgrade estimate for Co. Waterford

Extra generation

1,415 kWh/yr

Extra savings

€566/yr

Estimated upgrade cost

€1,200

Payback period

2.1 years

System upgrade: 3.5kW → 5.0kW (+1.5kW) at 943 kWh/kWp/year

Monthly extra generation

Jan
35 kWh
Feb
57 kWh
Mar
99 kWh
Apr
142 kWh
May
184 kWh
Jun
198 kWh
Jul
184 kWh
Aug
156 kWh
Sep
113 kWh
Oct
71 kWh
Nov
42 kWh
Dec
28 kWh

When are you thinking of doing this?

We'll only match you to contractors when you're ready.

Next steps

Solar calculator →Estimate generation and savingsBattery calculator →Add battery storage to your systemFind solar installers →SEAI-registered solar contractorsCheck your home →Full grant assessment
Official SEAI Resource — always verify grant details directly with SEAI before applying.

Last verified: 2026-06-01