Fronius Primo 8.2-1 string inverter
inverters

Fronius Primo 8.2-1 Inverter Hands-On Field Test 2026

Fronius Primo 8.2-1: 8.2 kW single-phase inverter, 98.0% efficiency, dual MPPT. Works with Tigo optimizers; Solar.web monitoring included free.

from $1,400

In stock

4.6 (248 reviews)

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Specifications

AC Output Power
8,200 W
Peak Efficiency
98.0%
MPPT Inputs
2 × MPPT
Max DC Input Voltage
600 V
AC Output Voltage
240 V
Warranty
10 years (extendable)
Protection Rating
IP65
Weight
21.5 kg
Display
Integrated LCD with LED status

Fronius Primo 8.2-1 - Overview

The Fronius Primo 8.2-1 is Fronius's 8.2 kW single-phase residential inverter, covering mid-to-large residential systems from approximately 8 to 11 kW peak DC. Fronius is an Austrian manufacturer with a reputation for engineering quality and an unusually open monitoring ecosystem - the Solar.web platform supports third-party optimizers including Tigo TS4 and SMA-compatible MLPE.

Dual MPPT and String Configuration

The Primo 8.2-1 supports two independent MPP trackers, each accepting up to 600V DC. This enables two separately optimised string arrays - useful for east-west split roofs or systems with panels at different tilts. The 600V maximum DC input (higher than SolarEdge's 480V) allows longer string runs, reducing DC cabling losses on larger roofs.

Fronius Solar.web Monitoring

Fronius includes Solar.web monitoring at no additional cost. The platform provides yield data, performance ratio tracking, fault alerts, and an API for integration with home energy management systems. Unlike SolarEdge monitoring (which requires SolarEdge optimizers for panel-level data), Solar.web provides string-level data natively and panel-level data when combined with Tigo TS4 optimizers.

Third-Party Optimizer Compatibility

The Primo 8.2-1 is compatible with Tigo TS4-A-O optimizers and Tigo's Cloud Connect Advanced gateway - making it a strong choice when panel-level monitoring is desired without SolarEdge ecosystem lock-in. The combination of Fronius Primo + Tigo TS4 is one of the most flexible mid-market optimizer-inverter pairings available.

Key Advantages

  • Open ecosystem - compatible with Tigo MLPE optimizers; no proprietary lock-in
  • 600V DC input - longer string runs, less cable loss
  • Fronius Solar.web - comprehensive monitoring included, with API access
  • Field-proven reliability - Fronius inverters have a long track record in European and Australian markets
  • Integrated display - LCD shows real-time production without needing a phone or app

Rating based on 248 installer reviews collected 2021 - 2024.

Related guides: Solar System Optimization: Complete Performance Guide · Tigo TS4-A-O Power Optimizer