Fronius Primo 3.8-1 vs Growatt MOD 10000TL3-XH
The Growatt MOD 10000TL3-XH edges ahead in this string-vs-string matchup. It delivers higher efficiency (97.5% vs 96% CEC). For most installations in this power range, the Growatt MOD 10000TL3-XH is the stronger choice.
Key Differences
- • Fronius Primo 3.8-1 delivers 3.8 kW AC output while Growatt MOD 10000TL3-XH delivers 10.0 kW, a 6200W difference.
- • Growatt MOD 10000TL3-XH achieves 97.5% CEC efficiency vs 96%.
- • Both carry 10-year warranties.
Specifications Breakdown
Power Output & Efficiency
The Fronius Primo 3.8-1 delivers 3.8 kW AC output at 96% CEC efficiency (96.6% peak), while the Growatt MOD 10000TL3-XH delivers 10.0 kW at 97.5% CEC (98.6% peak). The 6200W power difference is substantial and determines the maximum solar array each inverter can handle. The Growatt MOD 10000TL3-XH's higher CEC efficiency means it converts 1.5 percentage points more DC solar energy into usable AC electricity. On an average 8 kW system producing 12,000 kWh annually, this efficiency gap translates to approximately 180 kWh more usable energy per year, worth roughly $27 at $0.15/kWh.
MPPT Trackers & Panel Configuration
The Fronius Primo 3.8-1 features 2 MPPT inputs while the Growatt MOD 10000TL3-XH has 2. Matched MPPT counts provide equal flexibility for panel string configuration. Both can independently optimize 2 separate panel groups. The Fronius Primo 3.8-1 accepts up to 600V DC input with a 80-600V operating range, versus 1000V DC and 200-1000V for the Growatt MOD 10000TL3-XH.
Monitoring & Communication
The Fronius Primo 3.8-1 includes Fronius Solar.web (WiFi/Ethernet) monitoring with WiFi / Ethernet / USB / Fronius Solar API communication, while the Growatt MOD 10000TL3-XH offers Growatt ShinePhone App (WiFi) via WiFi, RS485. Different monitoring ecosystems mean different mobile app experiences, data granularity, and integration options with third-party energy management systems. Reliable monitoring is essential for detecting production drops, identifying panel-level issues, and maximizing system uptime over the inverter's lifetime. The Fronius Primo 3.8-1 carries an IP65 enclosure rating versus IP66 for the Growatt MOD 10000TL3-XH, which affects outdoor installation suitability.
Warranty & Reliability
The Fronius Primo 3.8-1 comes with a 10-year warranty while the Growatt MOD 10000TL3-XH offers 10 years. Matched warranty durations mean equal long-term manufacturer protection. Consider budgeting for a potential inverter replacement during the 25-30 year lifespan of your solar panels.
Specification Comparison
| Specification | Fronius Primo 3.8-1 | Growatt MOD 10000TL3-XH |
|---|---|---|
| Type | string | string |
| AC Power | 3800W | 10000W |
| Peak Efficiency | 96.6% | 98.6% |
| CEC Efficiency | 96% | 97.5% |
| MPPT Trackers | 2 | 2 |
| Monitoring | Fronius Solar.web (WiFi/Ethernet) | Growatt ShinePhone App (WiFi) |
| Weight | 21.5 kg | 23 kg |
| Warranty | 10 years | 10 years |
5-Dimension Head-to-Head Analysis
1. Power Capacity
Winner: Growatt MOD 10000TL3-XHThe Growatt MOD 10000TL3-XH delivers 10.0 kW versus 3.8 kW. This is a significant capacity difference that determines the maximum solar array size each can support.
2. Conversion Efficiency
Winner: Growatt MOD 10000TL3-XHThe Growatt MOD 10000TL3-XH achieves 97.5% CEC efficiency versus 96%. Every percentage point of efficiency translates to approximately $100-200 in additional energy production over a 25-year system life on an average 8 kW system. This efficiency gap is substantial and meaningfully impacts lifetime ROI.
3. Features & Architecture
Winner: TieBoth are strings with 2 MPPT trackers. Matched MPPT counts mean equal roof configuration flexibility.
4. Warranty & Reliability
Winner: TieBoth carry 10-year warranties — equal long-term protection.
5. Overall Value
Winner: Growatt MOD 10000TL3-XHWeighing efficiency, warranty, and power capacity together, the Growatt MOD 10000TL3-XH delivers the better overall package. Get installer quotes for both to compare actual installed costs in your area.
Fronius Primo 3.8-1
The Fronius Primo 3.8-1 is the entry-level SnapINverter for small US residential systems, featuring dual MPPT, wide 80-600V DC range, and Fronius's signature Austrian build quality. Predecessor to the GEN24 series.
Pros
- + Dual MPPT handles two roof orientations independently
- + Wide 80-600V voltage range — SuperFlex design for flexible string sizing
- + SnapINverter mounting for quick disconnect and service
- + IP65 outdoor rated with -40°C cold start capability
- + WiFi and Ethernet monitoring built-in
Cons
- - No battery integration — pure string inverter only
- - 96.0% CEC efficiency lower than newer HD-Wave and GEN24 platforms
- - 10-year warranty shorter than Enphase 25-year
- - Discontinued model — replacement parts availability declining
Growatt MOD 10000TL3-XH
The Growatt MOD 10000TL3-XH is a high-efficiency 10kW three-phase string inverter optimized for commercial and large residential installations. With 98.6% peak efficiency, 1000V DC input, and dual MPPT trackers, it delivers excellent energy harvest from large solar arrays.
Pros
- + Industry-leading 98.6% peak efficiency minimizes conversion losses
- + 1000V DC input supports long string configurations
- + Lightweight 23kg design for easy single-person installation
- + IP66 rated for harsh outdoor environments
Cons
- - Three-phase output not suitable for most US residential (split-phase) homes
- - No built-in battery management capability
- - Limited US certifications — primarily EU/international market
Choose Fronius Primo 3.8-1 If...
- ✓ Small residential systems of 3-4 kW on homes with two roof orientations needing independent MPPT tracking.
Choose Growatt MOD 10000TL3-XH If...
- ✓ You want maximum energy conversion efficiency to minimize power losses
- ✓ Your system size requires 10 kW+ of inverter capacity
- ✓ Three-phase commercial or international residential installations requiring high-efficiency string conversion
Our Recommendation
The Growatt MOD 10000TL3-XH is the decisive winner in this inverter comparison, outperforming the Fronius Primo 3.8-1 in 3 of 5 dimensions. Unless you have a specific requirement that the Fronius Primo 3.8-1 uniquely addresses, the Growatt MOD 10000TL3-XH is the stronger choice for virtually every installation scenario.
Frequently Asked Questions
Which is better, Fronius Primo 3.8-1 or Growatt MOD 10000TL3-XH?
The Growatt MOD 10000TL3-XH edges ahead in this string-vs-string matchup. It delivers higher efficiency (97.5% vs 96% CEC). For most installations in this power range, the Growatt MOD 10000TL3-XH is the stronger choice.
Which inverter is more efficient?
The Fronius Primo 3.8-1 achieves 96% CEC efficiency (96.6% peak) versus the Growatt MOD 10000TL3-XH at 97.5% CEC (98.6% peak). Growatt MOD 10000TL3-XH converts more DC solar power to usable AC electricity. CEC efficiency is the more realistic measure, accounting for varying power levels throughout the day.
Can Fronius Primo 3.8-1 or Growatt MOD 10000TL3-XH work with battery storage?
The Fronius Primo 3.8-1 is a string without built-in battery management. The Growatt MOD 10000TL3-XH is a string without built-in battery management. Both require an AC-coupled battery system (like Tesla Powerwall) for storage, or replacement with a hybrid inverter.
Which has a better warranty?
The Fronius Primo 3.8-1 offers 10 years versus 10 years for the Growatt MOD 10000TL3-XH. Both offer identical warranty terms. Paid warranty extensions are typically available from both manufacturers.
Which inverter type is better: string or string?
Both are strings, so the comparison comes down to specifications, brand ecosystem, and pricing rather than architecture. Compare efficiency, warranty, monitoring quality, and installer support when choosing between these two strings.
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Last updated: February 2026