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.
Get it installed
Find SEAI-registered installers for the JA Solar Deep Blue 4.0 Pro 420W
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 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.
