Find Out Exactly How to Cut Your Irish Electricity Bill.
No sales calls, no lead-gen forms, and zero guesswork. Compare all 19 Irish smart tariffs, size solar & home batteries, or test EV night boost charging with your real smart meter data.
“I have my ESB Smart Meter file—or want to cut my electricity bill.”
- ✓Instant Bill Audit: Compare all 19 Irish smart tariffs against your real half-hourly usage.
- ✓Spot Hidden Waste: Uncover your 24/7 “Sleep” standby bill and 5pm–7pm “Dinner Rush” penalty.
- ✓100% Private: Parsed in local browser RAM. MPRN & serials are stripped instantly.
Drop ESB CSV here or browse your device
Supports HDF_calckWh (30-min kWh), HDF_kW & Daily files
“I’m thinking about Solar Panels and want to know if my roof pays back.”
- •Sweet-Spot Panel Sizing: Model 2.0 kWp–6.0 kWp arrays across all 26 Irish counties with the statutory 2026 €1,800 SEAI grant.
- •Diverter vs. Cash Export: See whether heating domestic hot water (Eddi) or taking 18.5c–24c/kWh tax-free export cash wins.
- •€400/€800 Tax Cliff Check: Protect your earnings under the Revenue Section 216D tax exemption limit.
“I’m considering a Home Battery or EV and want to see if it pays back.”
- •EV Night Boost Matcher: Test 7.2 kW home charging across 2-hour (02:00–04:00) vs. 4-hour (02:00–06:00) super-off-peak plans.
- •Honest 10-Yr Battery Payback: Uncompromising math factoring in 88% round-trip efficiency, 2%/yr degradation, and the €600 SEAI grant.
- •63A Main Fuse Safety: Prevent grid cutout trips during simultaneous heat pump, shower, and EV charging draws.
“I don’t have my smart meter file yet—just give me a quick ballpark.”
Why Irish Homeowners Trust WattMatrix
100% Local In-Browser RAM
Your ESB file never leaves your device. Parsed entirely in browser memory; your MPRN and meter serial numbers are stripped immediately.
Zero Sales & Zero Commissions
We do not sell solar panels, capture phone numbers for installers, or take referral kickbacks from electricity suppliers. Unbiased mathematics only.
Statutory Irish Calibration
Enforces 9% domestic VAT, Revenue Section 216D (€400/€800 tax-free CEG cap), SEAI 2026 grants (€1,800 solar / €600 battery), and ESB NC6 6.0 kVA limits.
Deterministic Decision Engines
Smart Meter Tariff Analyzer
Upload your raw ESB Networks 30-minute interval CSV. Evaluate your actual consumption across 11 Irish smart tariffs, isolate 2am–4am and 2am–6am EV night boost windows, and calculate CEG solar export credits.
Hot Water Diverter vs. Export
Should surplus solar heat your water or export to the grid? With CEG export tariffs paying up to 24c/kWh, heating water with solar immersion often costs more than kerosene or heat pump heating.
Rooftop Solar & Battery Sizer
Model seasonal solar yield across all 26 Irish counties, SEAI grant deductions (up to €1,800 solar / €600 battery), and inverter export clipping at the statutory ESB NC6 6 kVA single-phase cap.
EV Dynamic Smart Charging
Simulate EV mileage costs comparing petrol ICE against 7c–9c/kWh night boost charging. Verify coincident peak load to protect your 63A ESB domestic supply fuse.
Heat Pump & HLI Readiness
SEAI heat pump capital grants (-€6,500) require a statutory Heat Loss Indicator (HLI) ≤ 2.0 W/K/m². Input your dwelling type and insulation age to verify eligibility.
Home Battery Shootouts
Head-to-head engineering showdowns between the leading residential battery systems: Sigenergy SigenStor, Tesla Powerwall 3, Huawei LUNA2000, and GivEnergy All-in-One.
QUICK HARDWARE SANDBOX // 3-SLIDER ESTIMATORInteractive Solar PV, Battery & Demand Estimator
Looking to test rough ballpark hardware figures without an ESB file? Expand this sandbox to test solar kWp, battery storage, and annual kWh demand.
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Interactive Solar PV, Battery & Demand Estimator
Looking to test rough ballpark hardware figures without an ESB file? Expand this sandbox to test solar kWp, battery storage, and annual kWh demand.
Calibrated to Official Irish & European Grid Standards
⚡Looking for portable power station runtimes or backup battery sizing?▾
WattMatrix originally launched as an open portable generator and LFP power station runtime calculation matrix. All 12 power stations, discharge curves, and appliance surge specs remain preserved in our dedicated comparison matrix.