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.
JA Solar · Residential Solar Panel · Ireland 2026
JA Solar Deep Blue 4.0 Pro 420W — Ireland 2026
N-type bifacial TOPCon — captures reflected light from the roof
The Deep Blue 4.0 Pro is a bifacial N-type TOPCon panel — meaning it generates electricity from both the front and rear surfaces. Light reflected off the roof surface (albedo) hits the rear glass and contributes additional output. On light-coloured or metal roofs this can add 5–15% to total energy yield. One of the most affordable bifacial options available in Ireland.
420W21.8% efficiency30-yr performance warrantyN-type TOPCon BifacialSEAI grant
⚙️ Specifications
Wattage
420 W
Efficiency
21.8%
Cell technology
N-type TOPCon Bifacial
Dimensions
1722 × 1134 × 30 mm
Weight
21.0 kg
Temperature coefficient
−0.30%/°C
Product warranty
12 years
Performance warranty
30 years
Annual degradation
0.4%/yr
Low-light performance
Very Good
Frame
Silver
💰 Pricing & SEAI grant
☀️ This panel — Step 1 of system
~€162 per panel
You still need: inverter (~€950–1,800) · mounting · installation
Est. panel cost — 24 panels (4kWp)~€3,888
SEAI Solar PV Home Grant (max €1,800)− €1,800
Panel cost after grant~€2,088
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
🔄
Bifacial — power from both sides
The rear glass captures reflected light from roof surfaces — on a light or metal roof this adds 5–15% additional energy output
🔬
N-type TOPCon
Zero Light Induced Degradation — full rated power from day one, with 0.4% annual degradation over 30 years
💶
Most affordable bifacial in Ireland
At ~€162 per panel the Deep Blue 4.0 Pro brings bifacial technology at standard panel pricing
🚗 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
5–15% additional yield from rear-side generation on suitable roofs
30-year performance warranty
Competitive price for a bifacial N-type panel
⚠️ Worth knowing
Bifacial benefit limited on dark-coloured roofs
Standard 12-year product warranty
Silver frame only
📐 System sizes & SEAI grant
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
5 kWp
12 panels
~4,500 kWh/yr
€1,800
6 kWp
15 panels
~5,400 kWh/yr
€1,800
⚡ Compatible inverters
The Deep Blue 4.0 Pro 420W 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 Deep Blue 4.0 Pro 420W 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 Deep Blue 4.0 Pro 420W is Step 1 of a complete solar installation. Here's what you need next:
🧠 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 Deep Blue 4.0 Pro 420W 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
JA Solar Deep Blue 4.0 Pro 420W — 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 EV fleet operators & leasing companies
Manage your entire charging fleet — across sites, with energy rate control
Fleet operators can manage charging across multiple sites through a single app. Assign Pure Energy chargers for green-fleet reporting, Smart Energy for cost efficiency, or Boost Energy for fast overnight turnaround. Drivers see live energy rates before booking — maximise charger utilisation, eliminate reception overhead.
☀️ Pure Energy🔄 Smart Energy🚀 Boost Energy
🚐
Vehicle category routing
Car, Minibus, Van, Truck — drivers filtered to chargers rated for their vehicle class
⚡
Energy rate per charger
Assign Pure, Smart or Boost Energy per charger — green fleet compliance tracking built in
🔑
Self & guest bookings
Fleet managers book for drivers who don't have the app — drivers notified and guided through check-in
❓ Deep Blue 4.0 Pro 420W — frequently asked questions for Irish buyers
A fully installed 4kWp system using the JA Solar Deep Blue 4.0 Pro 420W costs approximately €4,770 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 €2,970. 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 JA Solar Deep Blue 4.0 Pro 420W requires 10 panels (each at 420W). 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 (12–15 panels).
The JA Solar Deep Blue 4.0 Pro 420W comes with a 30-year performance warranty and a 12-year product warranty. The performance warranty guarantees that the panel will still output at least 87–88% of its original rated power at year 30. The product warranty covers manufacturing defects. Annual degradation is 0.4% — lower than standard PERC panels due to the N-type cell technology.
Yes — the JA Solar Deep Blue 4.0 Pro 420W is well suited to Ireland's climate. Its low-light performance is rated Very Good, which matters because Ireland receives a high proportion of diffuse, overcast light rather than direct sunshine. The temperature coefficient of −0.30%/°C means it loses NaN% efficiency per degree above standard test conditions — in line with industry standards. A 4kWp system in Ireland generates approximately 3,600 kWh/year despite our cloud cover.
N-type TOPCon Bifacial (dual-sided power generation) 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 (0.4%/yr vs 0.5–0.6% for PERC), meaning more cumulative kWh over the 30-year warranty period. For Irish conditions, the difference over 25 years is typically 3–5% more lifetime energy yield.
Adding battery storage to a JA Solar Deep Blue 4.0 Pro 420W 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.
Yes — bifacial panels generate additional power from light reflected off the roof surface (albedo). The gain depends on roof colour: light-coloured roofs (white, light grey, cream, metal) reflect more light and give gains of 8–15%. Dark-coloured roofs (black or dark grey slate, dark tile) give smaller gains of 2–5%. Even on a dark Irish slate roof, the bifacial gain is positive.
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 residential solar panels in our Irish directory.
