---
title: "Fronius Primo 12.5-1 vs Fronius International Symo Advanced 12.5-3-M - Inverter Comparison | ComparePV"
description: "Compare Fronius Primo 12.5-1 vs Fronius International Symo Advanced 12.5-3-M side by side: what actually differs, efficiency, MPP trackers, battery input and the full specification."
source: "https://comparepv.com/compare-inverters/fronius-international-fronius-primo-12-5-1/fronius-international-symo-advanced-12-5-3-m"
updated: 2026-01-16
---

# Fronius Primo 12.5-1 vs Fronius International Symo Advanced 12.5-3-M

Symo Advanced 12.5-3-M leads on the differences that matter

The largest is max efficiency: 1.1 pp more efficient. 12 of 20 comparable parameters are identical, with 12 more left out because at least one datasheet does not publish them.


## The two inverters


| Attribute | A | B |
| --- | --- | --- |
| Inverter | [Fronius Primo 12.5-1](https://comparepv.com/inverter/fronius-international-fronius-primo-12-5-1) | [Fronius International Symo Advanced 12.5-3-M](https://comparepv.com/inverter/fronius-international-symo-advanced-12-5-3-m) |
| Manufacturer | Fronius International | Fronius International |
| Rated AC power | 12.5 kW | 12.5 kW |
| Type | Grid-tie | Grid-tie |


## Where they differ

Ranked by how much the difference matters, not by datasheet order.


| Parameter | Fronius Primo 12.5-1 | Symo Advanced 12.5-3-M | Difference |
| --- | --- | --- | --- |
| Max efficiency | 96.7 % | 97.8 % | +1.1 pp for Symo Advanced 12.5-3-M |
| Weight | 37.4 kg | 35.4 kg | -2.0 kg for Symo Advanced 12.5-3-M |
| Grid connection | Single-phase | 3-phase | Single-phase vs 3-phase |
| Nominal AC voltage | 240 V | 400 V | 160 V apart |
| Max AC current | 52.1 A | 18.9 A | 33.2 A apart |
| Start voltage | 80 V | 200 V | -120 V for Fronius Primo 12.5-1 |
| Ingress protection | NEMA 4X | IP66 | NEMA 4X vs IP66 |
| Dimensions | 724x511x226 mm | 725x510x225 mm | 724x511x226 mm vs 725x510x225 mm |


## Every compared parameter


| Parameter | Fronius Primo 12.5-1 | Symo Advanced 12.5-3-M |
| --- | --- | --- |
| Rated AC power | 12.50 kW | 12.50 kW |
| Max AC power | 12.50 kW | 12.50 kW |
| Grid connection | Single-phase | 3-phase |
| Nominal AC voltage | 240 V | 400 V |
| Max AC current | 52.1 A | 18.9 A |
| Max PV power | - | 18.80 kW |
| DC/AC ratio | - | 1.50 |
| Max DC voltage | 1000 V | 1000 V |
| MPPT voltage range | 200-800 V | 200-800 V |
| Start voltage | 80 V | 200 V |
| MPP trackers | 2 | 2 |
| Strings per tracker | - | 3 |
| Max input current per tracker | 33.0 A | - |
| European efficiency | - | 97.4 % |
| Max efficiency | 96.7 % | 97.8 % |
| CEC efficiency | 96.5 % | - |
| Battery input | - | - |
| Battery voltage | - | - |
| Max charge current | - | - |
| Backup power | - | - |
| Weight | 37.4 kg | 35.4 kg |
| Weight per kW | 3.0 kg/kW | 2.8 kg/kW |
| Dimensions | 724x511x226 mm | 725x510x225 mm |
| Ingress protection | NEMA 4X | IP66 |
| Cooling | forced-air | forced-air |
| Noise | - | - |
| Max operating temperature | 60 °C | 60 °C |
| Wi-Fi | Yes | Yes |
| Ethernet | Yes | Yes |
| Arc fault protection | Yes | Yes |
| Integrated DC switch | Yes | Yes |
| Warranty | 10 yrs | - |


## Related comparisons

- [Fronius Primo 12.5-1 vs SolarEdge SE12.5K](https://comparepv.com/compare-inverters/fronius-international-fronius-primo-12-5-1/solaredge-se12-5k) - 9 differences, the largest is warranty
- [Fronius Primo 12.5-1 vs SolarEdge SE12.5K (Three Phase)](https://comparepv.com/compare-inverters/fronius-international-fronius-primo-12-5-1/solaredge-solaredge-se12-5k-three-phase) - 8 differences, the largest is max efficiency
- [Fronius Primo 12.5-1 vs Fronius Symo 12.5-3 480](https://comparepv.com/compare-inverters/fronius-international-fronius-primo-12-5-1/fronius-international-fronius-symo-12-5-3-480) - 6 differences, the largest is max efficiency


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Source: https://comparepv.com/compare-inverters/fronius-international-fronius-primo-12-5-1/fronius-international-symo-advanced-12-5-3-m

Not in this file, on the page: a written summary generated on request.