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.
Get it installed
Find SEAI-registered installers for the SunPower Maxeon 3 400W
Tell us what combination you need — solar only or a complete renewable upgrade with battery, EV charger and heat pump. We match you with up to 3 SEAI-registered installers in your area. Free and no obligation.
☀️ Get matched with local installers
Up to 3 SEAI-registered installers in your area will contact you within 1 business day with system recommendations and pricing.
💶 Get quotes
3 local installers · 1 business day
💬 Get advice first
Free assessment · no obligation
Your details are only shared with SEAI-registered Irish solar installers. No spam — ever.
✅
Request sent!
We're matching you with up to 3 SEAI-registered solar installers in your area. Expect contact within 1 business day.
De Energy Hub
More power to youTM.
🏨 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.
