Battery stores surplus solar · EMS maximises self-consumption · add ~10–25% more savings
Panel costs exclude inverter (~€950–1,800) + mounting + installation (~€2,000). SEAI grant covers all solar components except battery. Apply at seai.ie before work begins.
SunPower · Premium Solar Panel · Ireland 2026
SunPower Maxeon 3 400W — Ireland 2026
World's most efficient rooftop panel — 40-year performance guarantee
The SunPower Maxeon 3 is the benchmark for premium solar — the highest-efficiency rooftop panel in this directory, a 40-year performance guarantee that no other manufacturer matches, and the lowest annual degradation rate available (0.25%/yr). IBC technology places all electrical contacts on the rear of the cell, eliminating shading from front-side grid lines. The choice for homeowners investing long-term who want maximum output from a limited roof area.
400W22.6% efficiency40-yr performance warrantyIBC (Interdigitated Back Contact)🖤 All-BlackSEAI grantPremium
⚙️ Specifications
Wattage
400 W
Efficiency
22.6%
Cell technology
IBC (Interdigitated Back Contact)
Dimensions
1690 × 1046 × 40 mm
Weight
19.0 kg
Temperature coefficient
−0.27%/°C
Product warranty
25 years
Performance warranty
40 years
Annual degradation
0.25%/yr
Low-light performance
Excellent
Frame
All-Black
💰 Pricing & SEAI grant
☀️ This panel — Step 1 of system
~€380 per panel
You still need: inverter (~€950–1,800) · mounting · installation
Est. panel cost — 25 panels (4kWp)~€9,500
SEAI Solar PV Home Grant (max €1,800)− €1,800
Panel cost after grant~€7,700
Grant applies to the full installed system cost — panels, inverter, mounting and labour. Apply at seai.ie and receive a Letter of Offer before installation begins. Must use a SEAI-registered contractor.
Key highlights
🏆
40-year performance guarantee
SunPower guarantees at least 88.25% output at year 25 — the longest warranty in the global solar industry
🔬
IBC — no front-side grid lines
All electrical contacts are on the rear of the cell — nothing shadows the front surface, maximising light capture across the entire panel area
📉
0.25% annual degradation
The lowest degradation rate available — after 30 years the Maxeon still produces 92.5% of its original output
🚗 Pair with an electric car — charge from your own solar
Solar panels and an EV are the most powerful combination for Irish homeowners. Your roof generates free electricity — your EV turns it into free kilometres. A 4kWp solar system covers approximately 30,000km of free driving per year when you charge at home. See the full EV Vehicle Directory — 205+ electric vehicles available in Ireland.
⚡ How many free kilometres does your solar system give you?
☀️ 4kWp solar/yr
3,600 kWh
generated free
🚗 Free driving
~30,000 km
in an average EV/yr
💶 vs public charging
~€1,200/yr
saved on charging
A myenergi Zappi EV charger automatically uses surplus solar before it exports — in Eco+ mode, your EV only charges when your panels are generating more than your home needs. The solar generates free electricity; the Zappi makes sure it fills your car first.
View myenergi Zappi →
Featured electric cars — most popular in Ireland 2026
Estimated annual generation based on Ireland's average irradiance of ~900 kWh/kWp/yr. SEAI Solar PV Home Grant applies to the first 2kWp (€900/kWp, max €1,800). Installed cost estimate includes panels, inverter, mounting and labour.
System
Panels
Est. generation
SEAI grant
3 kWp
8 panels
~2,700 kWh/yr
€1,800
4 kWp
10 panels
~3,600 kWh/yr
€1,800
⚡ Compatible inverters
The Maxeon 3 400W is compatible with the following inverters — click any to see full specs, pricing and system cost estimates. See the Solar Inverter Directory to compare all 15 inverters available in Ireland.
✅ The Maxeon 3 400W is compatible with all major Irish inverter brands. Your installer will recommend the best pairing based on your roof size, usage and budget — hybrid inverters (Huawei, Fronius, Sungrow, SolarEdge) are recommended for any home that may want battery storage now or in future.
🔧 Complete your solar system
The Maxeon 3 400W is Step 1 of a complete solar installation. Here's what you need next:
☀️ Step 1 — You are here
SunPower Maxeon 3 400W
~€380/panel · 400W · IBC (Interdigitated Back Contact)
🧠 Energy Management Systems — get more from your solar
Solar panels generate electricity — an energy management system makes sure it's used at the right time and never wasted. EMS devices can reduce grid import by 10–25% beyond the panels alone, by coordinating generation, battery charging, hot water heating and EV charging. See the full Smart Energy Directory for all EMS products in Ireland.
💡 Why add an EMS to your solar system? Without an EMS, your solar system exports surplus energy to the grid at low export rates (typically €0.09–0.18/kWh via the Clean Export Guarantee). An EMS diverts that surplus to a hot water cylinder, battery, or EV charger — capturing value at your household electricity rate (€0.33–0.36/kWh) instead of the export rate.
🌡️ Pair with a heat pump — maximise your SEAI grants in Ireland
Solar panels and a heat pump are the most powerful renewable combination available to Irish homeowners today. Solar generates free electricity — a heat pump converts that electricity into heat at 3–5× efficiency. Both qualify for substantial SEAI grants. See the full Heat Pump Directory for all models available in Ireland.
💰 Combined SEAI grant opportunity — apply together
☀️ Solar PV Grant
€1,800
max residential
🌡️ Heat Pump Grant
€12,500
max (incl. bonus)
🏆 Total available
€14,600
in SEAI grants
How the heat pump grant breaks down (from 3 Feb 2026):
Heat Pump Equipment Grant (all qualifying homes)€6,500Central Heating Upgrade Grant (if radiators need work)+ €2,000Renewable Heat Bonus (switching from oil/gas/solid fuel)+ €4,000Maximum total heat pump grant€12,500EV Home Charger Grant (SEAI)+ €300Maximum total combined grant€14,600
💡 Apply BEFORE installation begins. Both the Solar PV and Heat Pump grants require a SEAI Letter of Offer before any contractor starts work. You can apply for both in the same process — ask your installer to coordinate a combined application. Also check: 9% VAT applies to heat pump supply and installation (reduced from 23% since 1 Jan 2025).
☀️ Why solar and a heat pump are the perfect pair: A heat pump runs entirely on electricity — and a solar system generates free electricity from your roof. A typical 4kWp solar system generates ~3,400–3,800 kWh/year. A heat pump for an average Irish home uses ~3,000–5,000 kWh/year for heating and hot water. With both installed, your solar covers a large portion of your heat pump's electricity use — at zero cost. The combination is the highest-savings renewable upgrade available to Irish homeowners today.
🔌 Pair with an EV charger — charge your car from your own solar
Solar panels and an EV charger are the second half of your home energy system. A smart charger draws from your panels first — turning free solar electricity directly into free kilometres. The SEAI Home Charger Grant (€300) applies on top of your solar grant.
🔌 Solar + EV charger: the complete home energy pairing
A solar-compatible smart charger like the myenergi Zappi draws directly from your panels in Eco+ mode — your car charges on electricity you generated for free before it exports to the grid. The SEAI Home Charger Grant covers €300 of your installation cost, and can be claimed alongside your solar grant in the same application.
The Maxeon 3 400W is the starting point of a complete renewable system. Most Irish homeowners install solar alongside at least one other technology — a heat pump + solar + battery combination delivers the highest savings available on the Irish market today, and both qualify for separate SEAI grants you can apply for together.
☀️
Solar panels
SunPower Maxeon 3 400W — SEAI grant up to €1,800
⚡
Solar inverter
Hybrid inverter — Huawei, Fronius or Sungrow recommended
🔋
Battery storage
Store surplus solar — use it after dark and cut grid import by 40–60%
🔌
EV home charger
Charge your EV for free from your own solar — myenergi Zappi Eco+ mode. SEAI EV Home Charger Grant: €300
🌡️
Heat pump
Run home heating from solar electricity — SEAI grant up to €12,500
🧠
Smart energy management
Coordinate all systems automatically — maximise self-consumption
💡 Most popular Irish combination in 2026: LONGi or JinkoSolar panels + Huawei SUN2000 hybrid inverter + Huawei Luna2000 battery + myenergi Zappi EV charger. Ask your installer to quote the full system — not just the panels. SEAI grants apply separately to solar (€1,800), heat pump (up to €12,500) and EV home charger (€300) — a total of up to €14,600.
📲 Park & Charge
Download De Energy Hub app
Search for parking and EV charging by location, book a session in advance or scan the QR code on arrival, then check in via the app, all from your phone. Get De Energy Hub free on the App Store or Google Play.
📲 Get De Energy Hub app
Download De Energy Hub to search for parking and EV charging by location, book in advance or scan the QR code on arrival, then check in via the app.
Free to download. Search, book and check in for parking or charging, all from your phone.
De Energy Hub
More power to you®.
🏨 Built for hotels, guesthouses & hospitality
Turn your car park into a guest amenity — fully managed
Add EV charging as a guest service without the headache. Set your energy rate — Pure Energy from your solar, Smart Energy balancing grid and renewables, or Boost Energy for maximum speed. Issue complimentary promo codes for guests on arrival. Eliminate first-come-first-served with advance booking — just like your meeting room.
☀️ Pure Energy🔄 Smart Energy🚀 Boost Energy
🎟️
Complimentary guest codes
Issue promo codes at reception — guests manage their own charging from check-in to check-out
📅
Book in advance
Guests reserve a charger before they arrive — no queuing, no reception involvement
⚡
Pure Energy badge
Guests see your charger runs on 100% solar — a selling point for eco-conscious EV drivers
A fully installed 4kWp system using the SunPower Maxeon 3 400W costs approximately €6,950 before grants — covering 10 panels, a compatible hybrid inverter, mounting and installation. After the SEAI Solar PV Home Grant of up to €1,800, the net cost is around €5,150. System cost varies by county, roof type, installer and whether you add battery storage. Get 3 quotes through the form above for accurate local pricing.
For a typical Irish home (3–4 bedrooms, ~4,000–5,000 kWh/year electricity use), a 4kWp system using the SunPower Maxeon 3 400W requires 10 panels (each at 400W). This generates approximately 3,600 kWh per year in Ireland — enough to cover 60–80% of average household consumption. Homes with EVs or heat pumps typically benefit from a 5–6kWp system (13–15 panels).
The SunPower Maxeon 3 400W comes with a 40-year performance warranty and a 25-year product warranty. The performance warranty guarantees that the panel will still output at least 87–88% of its original rated power at year 40. The product warranty covers manufacturing defects. Annual degradation is 0.25% — lower than standard PERC panels due to the N-type cell technology.
Yes — the SunPower Maxeon 3 400W is well suited to Ireland's climate. Its low-light performance is rated Excellent, which matters because Ireland receives a high proportion of diffuse, overcast light rather than direct sunshine. The temperature coefficient of −0.27%/°C means it loses NaN% efficiency per degree above standard test conditions — among the best available, making it particularly effective in Ireland's mild temperatures. A 4kWp system in Ireland generates approximately 3,600 kWh/year despite our cloud cover.
Maxeon IBC Gen 3 (Interdigitated Back Contact) is a premium cell technology that offers two key advantages over standard PERC panels. First, it has no Light Induced Degradation (LID) — standard PERC panels lose 1–2% output in their first months of operation; N-type panels produce full rated power from day one. Second, the annual degradation rate is lower (0.25%/yr vs 0.5–0.6% for PERC), meaning more cumulative kWh over the 40-year warranty period. For Irish conditions, the difference over 25 years is typically 3–5% more lifetime energy yield.
For Irish homeowners where kerb appeal matters — heritage properties, Victorian terraces, properties visible from the road — all-black panels like the SunPower Maxeon 3 400W are worth the premium (typically €220–€235 more per panel than silver-framed alternatives). The all-black finish (black frame, black backsheet, black cells) is virtually invisible on a dark slate or tile roof. The minor efficiency trade-off from increased heat absorption is less significant in Ireland's cool, mild climate than in warmer countries.
Adding battery storage to a SunPower Maxeon 3 400W system is recommended for most Irish homes. Without storage, surplus solar generated midday is exported to the grid at €0.09–0.18/kWh (Clean Export Guarantee rate) while you buy grid electricity in the evening at €0.33–0.36/kWh. A battery stores that surplus for evening use, increasing self-consumption from ~30% to 70–90%. A typical 10kWh battery (Huawei Luna2000, BYD) adds €3,200–€4,500 to the system cost and has a payback period of 4–7 years alongside the panels.
It depends on your priorities. The Maxeon 3 costs roughly 2–2.5× a standard panel (~€380 vs €160–175) but delivers: 0.25% vs 0.4–0.55% annual degradation (more lifetime kWh), a 40-year vs 25–30 year performance warranty, and 25-year vs 12–15 year product warranty. For a homeowner who plans to be in the house long-term and values maximum output from a limited roof area with the lowest possible maintenance risk, the premium is justifiable.
Yes — eligible for the SEAI Solar PV Home Grant of up to €1,800 when installed by a SEAI-registered contractor. Apply at seai.ie before installation begins.
☀️ Also consider
Other premium solar panels in our Irish directory.
