---
title: "Fronius Primo 3.8-1 vs Sungrow SG3.6RS - Inverter Comparison | ComparePV"
description: "Compare Fronius Primo 3.8-1 vs Sungrow SG3.6RS 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-3-8-1/sungrow-sg3-6rs"
updated: 2026-01-16
---

# Fronius Primo 3.8-1 vs Sungrow SG3.6RS

SG3.6RS leads on the differences that matter

The largest is max dc voltage: 400 V apart. 8 of 21 comparable parameters are identical, with 11 more left out because at least one datasheet does not publish them.


## The two inverters


| Attribute | A | B |
| --- | --- | --- |
| Inverter | [Fronius Primo 3.8-1](https://comparepv.com/inverter/fronius-international-fronius-primo-3-8-1) | [Sungrow SG3.6RS](https://comparepv.com/inverter/sungrow-sg3-6rs) |
| Manufacturer | Fronius International | Sungrow |
| Rated AC power | 3.8 kW | 3.68 kW |
| Type | Grid-tie | Grid-tie |


## Where they differ

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


| Parameter | Fronius Primo 3.8-1 | SG3.6RS | Difference |
| --- | --- | --- | --- |
| Max DC voltage | 1000 V | 600 V | 400 V apart |
| Max input current per tracker | 33.0 A | 16.0 A | +17.0 A for Fronius Primo 3.8-1 |
| Max efficiency | 96.7 % | 97.9 % | +1.2 pp for SG3.6RS |
| Rated AC power | 3.80 kW | 3.68 kW | 0.12 kW apart |
| Weight | 21.4 kg | 10.0 kg | -11.4 kg for SG3.6RS |
| Weight per kW | 5.6 kg/kW | 2.7 kg/kW | -2.9 kg/kW for SG3.6RS |
| Max AC power | 3.80 kW | 3.68 kW | 0.12 kW apart |
| Start voltage | 80 V | 50 V | -30 V for SG3.6RS |
| Ingress protection | NEMA 4X | IP65 | NEMA 4X vs IP65 |
| Nominal AC voltage | 240 V | 230 V | 10 V apart |
| MPPT voltage range | 200-800 V | 40-560 V | 200-800 V vs 40-560 V |
| Dimensions | 627x429x206 mm | 270x410x150 mm | 627x429x206 mm vs 270x410x150 mm |
| Cooling | forced-air | natural | forced-air vs natural |


## Every compared parameter


| Parameter | Fronius Primo 3.8-1 | SG3.6RS |
| --- | --- | --- |
| Rated AC power | 3.80 kW | 3.68 kW |
| Max AC power | 3.80 kW | 3.68 kW |
| Grid connection | Single-phase | Single-phase |
| Nominal AC voltage | 240 V | 230 V |
| Max AC current | 15.8 A | 16.0 A |
| Max PV power | - | 5.40 kW |
| DC/AC ratio | - | 1.47 |
| Max DC voltage | 1000 V | 600 V |
| MPPT voltage range | 200-800 V | 40-560 V |
| Start voltage | 80 V | 50 V |
| MPP trackers | 2 | 2 |
| Strings per tracker | - | 1 |
| Max input current per tracker | 33.0 A | 16.0 A |
| European efficiency | - | 97.0 % |
| Max efficiency | 96.7 % | 97.9 % |
| CEC efficiency | 95.0 % | - |
| Battery input | - | - |
| Battery voltage | - | - |
| Max charge current | - | - |
| Backup power | - | - |
| Weight | 21.4 kg | 10.0 kg |
| Weight per kW | 5.6 kg/kW | 2.7 kg/kW |
| Dimensions | 627x429x206 mm | 270x410x150 mm |
| Ingress protection | NEMA 4X | IP65 |
| Cooling | forced-air | natural |
| 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 3.8-1 vs SolarEdge EV Charging Single Phase Inverter SE3680H (aka H3680SE / SE3680H)](https://comparepv.com/compare-inverters/fronius-international-fronius-primo-3-8-1/solaredge-solaredge-ev-charging-single-phase-inverter-se3680h-aka-h3680se-se3680h) - 10 differences, the largest is max dc voltage
- [Fronius Primo 3.8-1 vs SolarEdge SE3680H (HD‑Wave, single phase)](https://comparepv.com/compare-inverters/fronius-international-fronius-primo-3-8-1/solaredge-solaredge-se3680h-hd-wave-single-phase) - 11 differences, the largest is warranty
- [Fronius Primo 3.8-1 vs Fronius Primo 3.6-1](https://comparepv.com/compare-inverters/fronius-international-fronius-primo-3-8-1/fronius-international-fronius-primo-3-6-1) - 9 differences, the largest is max input current per tracker
- [Sungrow SG3.6RS vs SMA Solar SB3.6-1AV-41 (Sunny Boy 3.6)](https://comparepv.com/compare-inverters/sungrow-sg3-6rs/sma-solar-sb3-6-1av-41-sunny-boy-3-6) - 10 differences, the largest is european efficiency


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Source: https://comparepv.com/compare-inverters/fronius-international-fronius-primo-3-8-1/sungrow-sg3-6rs

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