The Fronius Tauro ECO is the premium 50kW commercial string inverter — Austrian manufactured for 30-year operational projects where European build quality and the Fronius Solar.web monitoring platform are specified by the client or engineer. At 98.5% efficiency and IP66 rating, it matches the Sungrow SG50CX on headline numbers but with fewer MPPTs (6 vs 10) — the trade-off for tighter integration and the Fronius Solar.web commercial monitoring platform, which provides 20-year data archiving and automated performance ratio alerting. Specified on schools, healthcare facilities, council buildings and premium agricultural projects across Ireland.
50kW98.5% efficiency7-yr warrantyIP663-PhaseGrid-tie onlyPremiumSEAI grant
⚙️ Technical Specifications
Inverter type
3-Phase Commercial String
Rated output
50 kW
Power range
25–100 kWp
Efficiency
98.5%
MPPT inputs
6
Phase
3-Phase
Battery compatible
No — grid-tie only
Backup power
✗ No
Monitoring app
Fronius Solar.web
WiFi included
✓ Yes
Warranty
7 years
IP rating
IP66
Suitable for
Commercial / 3-Phase
💰 Pricing & grants
⚡ This inverter — Step 2 of system
~€6,500 supply price
You still need: panels · mounting · installation labour
💰 Irish solar grants for commercial installations
SEAI Non-Domestic Microgen grant · SEAI TAMS III for agri buildings (up to 60%) · Accelerated Capital Allowance (full year-1 write-off). Always verify eligibility at seai.ie before contracting.
When public bodies, schools, and healthcare facilities in Ireland specify solar, Fronius Tauro is commonly the engineer-specified inverter — its 40-year heritage, IP66 rating, and Fronius Solar.web monitoring satisfy procurement and facilities management requirements
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Fronius Solar.web — 20-year data archive
Best-in-class commercial monitoring with automated daily reports, performance ratio (PR) alerting, yield prediction vs actual, and a full 20-year generation data archive — critical for commercial solar asset management
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Austrian manufacture — European supply chain
Manufactured in Sattledt, Austria — European component sourcing, EU production standards, and a physical Austrian headquarters for warranty support and technical escalation. Preferred by procurement specifications that require European manufacture
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Strong track record on premium Irish projects — schools, council, healthcare
Best suited for long-term projects requiring 30-year operational performance data
⚠️ Worth knowing
Most expensive large commercial inverter (~€6,500 vs ~€4,500 for Sungrow SG50CX)
7-year warranty — shorter than the Sungrow SG50CX's 10 years
Only 6 MPPTs vs 10 on Sungrow SG50CX — less suited to highly complex multi-section roofs
No battery storage capability
Fewer certified Irish commercial installers vs Sungrow
📐 System sizes — indicative cost & payback
Estimated generation at 900 kWh/kWp/yr. Commercial system costs include panels, this inverter (~€6,500), mounting and installation. Payback based on a mid-range commercial electricity rate of €0.28/kWh.
System
Panels
Est. generation
Solar only (after grant)
Est. installed
Est. payback
30 kWp
52 panels
~27,000 kWh/yr
~€29,000
~3.8 yrs
50 kWp
87 panels
~45,000 kWh/yr
~€44,000
~3.5 yrs
100 kWp
173 panels
~90,000 kWh/yr
~€71,500
~2.8 yrs
200 kWp
345 panels
~180,000 kWh/yr
~€136,500
~2.7 yrs
Indicative payback by sector
🏢 Retail & Office
Rate ~€0.22–0.26/kWh. High daytime usage aligns well with solar generation.
Payback: 3–5 years
🏭 Warehouse & Manufacturing
Rate ~€0.26–0.32/kWh. Large roof + high daytime load = strongest commercial ROI.
Payback: 2.5–4 years
🌾 Agriculture (TAMS III)
Rate ~€0.18–0.24/kWh. TAMS III grant up to 60% transforms payback. Apply via Teagasc.
Payback: 1.5–3 years(with TAMS)
Estimates are indicative. Actual payback depends on your electricity tariff, usage profile, system size, roof orientation and applicable grants. Always obtain a site survey and financial model from a qualified commercial solar installer.
🔧 Complete your solar system
The Tauro ECO 50kW 3-Phase is Step 2 — you need panels before it and most Irish homeowners now add battery storage after. Here are the most popular pairings in 2026:
💡 Commercial tip: Most Irish commercial solar installations use LONGi Hi-MO 7 (580W) or JinkoSolar Tiger Neo (580W) panels with this inverter. Fewer panels per kWp means lower mounting and labour costs at scale.
The Tauro ECO 50kW 3-Phase is compatible with all major solar panel brands available in Ireland. See the Solar Panel Directory to compare specifications, pricing and SEAI eligibility for all 13 panels.
This is a grid-tie only string inverter — it cannot be retrofitted with battery storage. If battery storage is in your future plans, consider the hybrid inverters in the directory instead.
❓ Questions about the Tauro ECO 50kW 3-Phase
Yes — the SEAI Solar PV Home Grant of up to €1,800 applies to the total installed system cost, which includes the Fronius Tauro ECO 50kW 3-Phase, panels, mounting hardware, cabling and labour. The grant is not awarded per component. Apply at seai.ie before installation begins and receive a Letter of Offer before work starts. A SEAI-registered contractor is required.
The Fronius Tauro ECO 50kW 3-Phase carries a 7-year product warranty from Fronius. In practice, quality inverters from Fronius frequently operate for 15–20 years before requiring replacement. The key factors for longevity are: installation in a cool, shaded, well-ventilated location (not in direct sunlight); proper cable termination torque during installation; and regular firmware updates through Fronius Solar.web.
Fronius Solar.web is a comprehensive platform with a 20-year data archive, automated performance ratio (PR) alerting, and daily generation reports. The interface is designed for long-term data management — better suited to professionals and serious solar optimisers than casual daily checking. A dedicated mobile app is also available.
No — the Fronius Tauro ECO 50kW 3-Phase is a grid-tie only string inverter with no battery port. To add battery storage later, you would need to replace the inverter with a hybrid model (approx. €1,000–1,500 extra). An AC-coupled battery (a separate battery inverter installed in parallel) can be retrofitted without replacing the main inverter, but this is less efficient and more costly than a native DC-coupled hybrid solution. If battery storage is a possibility within the next 5–10 years, choosing a hybrid inverter from the outset is strongly recommended.
Check your electricity meter and the main circuit breaker in your distribution board. A single-phase supply has one live wire (brown), one neutral (blue) and one earth (green-yellow). A 3-phase supply has three live wires (brown, black, grey), one neutral and one earth — and your main breaker will be a 3-pole or 4-pole type. Most Irish commercial properties, farms, industrial units and larger homes above ~200m² are 3-phase. Your ESB Networks connection agreement will also confirm this. If uncertain, ask a RECI-registered electrician to check before ordering your inverter.
Multiple schemes may apply: the SEAI Non-Domestic Microgen grant for smaller commercial systems; TAMS III providing up to 60% grant aid for qualifying agricultural buildings; and Accelerated Capital Allowance (ACA) through Revenue allowing the full capital cost (including the Fronius Tauro ECO 50kW 3-Phase) to be written off against corporation tax in year one. The SEAI Better Energy Communities scheme may also apply for community projects. Verify current eligibility at seai.ie before contracting — grant values and thresholds are updated annually.
A string inverter converts DC solar energy to AC for immediate use or grid export — but cannot charge a battery. A hybrid inverter does the same, and also includes an integrated battery management system (BMS) that can charge and discharge a connected battery storage unit. The Fronius Tauro ECO 50kW 3-Phase is a grid-tie string inverter — no battery storage is included or retrofittable. If battery storage is in your plans, start with a hybrid inverter. The cost gap between hybrid and string inverters has narrowed significantly — most Irish installers now default to hybrid for all new residential installations.
Choose Sungrow SG50CX if: you need 10 independent MPPTs for a complex roof, you want 10-year warranty coverage, cost is a significant factor (Fronius is ~€2,000 more), or your installer has stronger Sungrow commissioning experience. Choose Fronius Tauro ECO if: the client or specification requires EU/Austrian manufacture, the Fronius Solar.web monitoring platform is specified (schools, healthcare, council), or the project requires 30-year documentation support and the Fronius brand name is meaningful to the buyer. Both deliver IP66 and equivalent efficiency — the choice is primarily about specification, monitoring platform preference, and installer expertise.
The Fronius Tauro ECO carries a 7-year standard warranty vs Sungrow's 10 years — a genuine trade-off. Fronius typically offers extended warranty options (up to 10 years) at additional cost through authorised distributors. For long-term projects where 10-year warranty coverage is a procurement requirement, either negotiate an extended Fronius warranty upfront, or consider the Sungrow SG50CX. The Fronius inverters manufactured in Austria have one of the best long-term reliability records in the industry — the shorter standard warranty reflects a commercial decision, not an inferior product.
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