Growatt MOD 7000TL3-XH vs Fronius Primo 3.8-1
The Growatt MOD 7000TL3-XH edges ahead in this string-vs-string matchup. It delivers higher efficiency (97.6% vs 96% CEC). For most installations in this power range, the Growatt MOD 7000TL3-XH is the stronger choice.
Key Differences
- • Growatt MOD 7000TL3-XH delivers 7.0 kW AC output while Fronius Primo 3.8-1 delivers 3.8 kW, a 3200W difference.
- • Growatt MOD 7000TL3-XH achieves 97.6% CEC efficiency vs 96%.
- • Both carry 10-year warranties.
Specifications Breakdown
Power Output & Efficiency
The Growatt MOD 7000TL3-XH delivers 7.0 kW AC output at 97.6% CEC efficiency (98.4% peak), while the Fronius Primo 3.8-1 delivers 3.8 kW at 96% CEC (96.6% peak). The 3200W power difference is substantial and determines the maximum solar array each inverter can handle. The Growatt MOD 7000TL3-XH's higher CEC efficiency means it converts 1.6 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 192 kWh more usable energy per year, worth roughly $29 at $0.15/kWh.
MPPT Trackers & Panel Configuration
The Growatt MOD 7000TL3-XH features 2 MPPT inputs while the Fronius Primo 3.8-1 has 2. Matched MPPT counts provide equal flexibility for panel string configuration. Both can independently optimize 2 separate panel groups. The Growatt MOD 7000TL3-XH accepts up to 1000V DC input with a 140-1000V operating range, versus 600V DC and 80-600V for the Fronius Primo 3.8-1.
Monitoring & Communication
The Growatt MOD 7000TL3-XH includes Growatt ShinePhone App (WiFi/Ethernet) monitoring with WiFi / Ethernet / RS-485 communication, while the Fronius Primo 3.8-1 offers Fronius Solar.web (WiFi/Ethernet) via WiFi / Ethernet / USB / Fronius Solar API. 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. Both carry IP65 protection ratings for equivalent environmental durability.
Warranty & Reliability
The Growatt MOD 7000TL3-XH comes with a 10-year warranty while the Fronius Primo 3.8-1 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 | Growatt MOD 7000TL3-XH | Fronius Primo 3.8-1 |
|---|---|---|
| Type | string | string |
| AC Power | 7000W | 3800W |
| Peak Efficiency | 98.4% | 96.6% |
| CEC Efficiency | 97.6% | 96% |
| MPPT Trackers | 2 | 2 |
| Monitoring | Growatt ShinePhone App (WiFi/Ethernet) | Fronius Solar.web (WiFi/Ethernet) |
| Weight | 17.5 kg | 21.5 kg |
| Warranty | 10 years | 10 years |
5-Dimension Head-to-Head Analysis
1. Power Capacity
Winner: Growatt MOD 7000TL3-XHThe Growatt MOD 7000TL3-XH delivers 7.0 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 7000TL3-XHThe Growatt MOD 7000TL3-XH achieves 97.6% 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 7000TL3-XHWeighing efficiency, warranty, and power capacity together, the Growatt MOD 7000TL3-XH delivers the better overall package. Get installer quotes for both to compare actual installed costs in your area.
Growatt MOD 7000TL3-XH
The Growatt MOD 7000TL3-XH is a 7 kW three-phase string inverter with battery-ready functionality, offering 1000V DC input capability and dual MPPT at an aggressive commercial price point.
Pros
- + 1000V DC input allows longer strings and reduces balance-of-system wiring costs
- + Compact three-phase design fits easily in commercial electrical rooms or on exterior walls
- + Strong price-to-performance ratio makes it competitive for budget-constrained commercial projects
- + Battery-ready architecture supports future storage expansion
Cons
- - Three-phase output limits applicability in single-phase residential markets
- - Smaller US service and warranty support infrastructure than SMA or Fronius
- - ShinePhone monitoring is less feature-rich than competing commercial platforms
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
Choose Growatt MOD 7000TL3-XH If...
- ✓ You want maximum energy conversion efficiency to minimize power losses
- ✓ Your system size requires 7 kW+ of inverter capacity
- ✓ Small commercial three-phase installations that need reliable string inversion at the lowest cost per watt with future storage expandability
Choose Fronius Primo 3.8-1 If...
- ✓ Small residential systems of 3-4 kW on homes with two roof orientations needing independent MPPT tracking.
Our Recommendation
The Growatt MOD 7000TL3-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 7000TL3-XH is the stronger choice for virtually every installation scenario.
Frequently Asked Questions
Which is better, Growatt MOD 7000TL3-XH or Fronius Primo 3.8-1?
The Growatt MOD 7000TL3-XH edges ahead in this string-vs-string matchup. It delivers higher efficiency (97.6% vs 96% CEC). For most installations in this power range, the Growatt MOD 7000TL3-XH is the stronger choice.
Which inverter is more efficient?
The Growatt MOD 7000TL3-XH achieves 97.6% CEC efficiency (98.4% peak) versus the Fronius Primo 3.8-1 at 96% CEC (96.6% peak). Growatt MOD 7000TL3-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 Growatt MOD 7000TL3-XH or Fronius Primo 3.8-1 work with battery storage?
The Growatt MOD 7000TL3-XH is a string without built-in battery management. The Fronius Primo 3.8-1 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 Growatt MOD 7000TL3-XH offers 10 years versus 10 years for the Fronius Primo 3.8-1. 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