---
title: "SMA Solar SB2.5-1VL-40 (Sunny Boy 2.5) vs Sungrow SG2.5RS-S - Inverter Comparison | ComparePV"
description: "Compare SMA Solar SB2.5-1VL-40 (Sunny Boy 2.5) vs Sungrow SG2.5RS-S side by side: what actually differs, efficiency, MPP trackers, battery input and the full specification."
source: "https://comparepv.com/compare-inverters/sma-solar-sb2-5-1vl-40-sunny-boy-2-5/sungrow-sg2-5rs-s"
updated: 2026-01-16
---

# SMA Solar SB2.5-1VL-40 (Sunny Boy 2.5) vs Sungrow SG2.5RS-S

SG2.5RS-S leads on the differences that matter

The largest is european efficiency: 0.5 pp more efficient. 14 of 24 comparable parameters are identical, with 8 more left out because at least one datasheet does not publish them.


## The two inverters


| Attribute | A | B |
| --- | --- | --- |
| Inverter | [SMA Solar SB2.5-1VL-40 (Sunny Boy 2.5)](https://comparepv.com/inverter/sma-solar-sb2-5-1vl-40-sunny-boy-2-5) | [Sungrow SG2.5RS-S](https://comparepv.com/inverter/sungrow-sg2-5rs-s) |
| Manufacturer | SMA Solar | Sungrow |
| Rated AC power | 2.5 kW | 2.5 kW |
| Type | Grid-tie | Grid-tie |


## Where they differ

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


| Parameter | SB2.5-1VL-40 (Sunny Boy 2.5) | SG2.5RS-S | Difference |
| --- | --- | --- | --- |
| European efficiency | 96.7 % | 97.2 % | +0.5 pp for SG2.5RS-S |
| Max input current per tracker | 10.0 A | 16.0 A | +6.0 A for SG2.5RS-S |
| Max efficiency | 97.2 % | 97.8 % | +0.6 pp for SG2.5RS-S |
| Max PV power | 5.00 kW | 3.75 kW | 1.25 kW apart |
| DC/AC ratio | 2.00 | 1.50 | +0.50 for SB2.5-1VL-40 (Sunny Boy 2.5) |
| Weight | 9.2 kg | 6.0 kg | -3.2 kg for SG2.5RS-S |
| Weight per kW | 3.7 kg/kW | 2.4 kg/kW | -1.3 kg/kW for SG2.5RS-S |
| Start voltage | 80 V | 50 V | -30 V for SG2.5RS-S |
| MPPT voltage range | 160-500 V | 40-560 V | 160-500 V vs 40-560 V |
| Dimensions | 357x460x122 mm | 225x320x120 mm | 357x460x122 mm vs 225x320x120 mm |


## Every compared parameter


| Parameter | SB2.5-1VL-40 (Sunny Boy 2.5) | SG2.5RS-S |
| --- | --- | --- |
| Rated AC power | 2.50 kW | 2.50 kW |
| Max AC power | 2.50 kW | 2.50 kW |
| Grid connection | Single-phase | Single-phase |
| Nominal AC voltage | 230 V | 230 V |
| Max AC current | 11.0 A | 11.4 A |
| Max PV power | 5.00 kW | 3.75 kW |
| DC/AC ratio | 2.00 | 1.50 |
| Max DC voltage | 600 V | 600 V |
| MPPT voltage range | 160-500 V | 40-560 V |
| Start voltage | 80 V | 50 V |
| MPP trackers | 1 | 1 |
| Strings per tracker | 1 | 1 |
| Max input current per tracker | 10.0 A | 16.0 A |
| European efficiency | 96.7 % | 97.2 % |
| Max efficiency | 97.2 % | 97.8 % |
| CEC efficiency | - | - |
| Battery input | - | - |
| Battery voltage | - | - |
| Max charge current | - | - |
| Backup power | - | - |
| Weight | 9.2 kg | 6.0 kg |
| Weight per kW | 3.7 kg/kW | 2.4 kg/kW |
| Dimensions | 357x460x122 mm | 225x320x120 mm |
| Ingress protection | IP65 | IP65 |
| Cooling | natural | natural |
| Noise | 25 dB | - |
| Max operating temperature | 60 °C | 60 °C |
| Wi-Fi | Yes | Yes |
| Ethernet | Yes | Yes |
| Arc fault protection | - | Yes |
| Integrated DC switch | Yes | Yes |
| Warranty | 5 yrs | - |


## Related comparisons

- [SMA Solar SB2.5-1VL-40 (Sunny Boy 2.5) vs Growatt 2500-S](https://comparepv.com/compare-inverters/sma-solar-sb2-5-1vl-40-sunny-boy-2-5/growatt-growatt-2500-s) - 10 differences, the largest is european efficiency
- [SMA Solar SB2.5-1VL-40 (Sunny Boy 2.5) vs GoodWe GW2500-XS](https://comparepv.com/compare-inverters/sma-solar-sb2-5-1vl-40-sunny-boy-2-5/goodwe-gw2500-xs) - 11 differences, the largest is european efficiency
- [SMA Solar SB2.5-1VL-40 (Sunny Boy 2.5) vs Growatt MIN 2500TL-X](https://comparepv.com/compare-inverters/sma-solar-sb2-5-1vl-40-sunny-boy-2-5/growatt-min-2500tl-x) - 11 differences, the largest is max input current per tracker
- [Sungrow SG2.5RS-S vs Growatt MIC 2500TL-X](https://comparepv.com/compare-inverters/sungrow-sg2-5rs-s/growatt-mic-2500tl-x) - 9 differences, the largest is max dc voltage


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Source: https://comparepv.com/compare-inverters/sma-solar-sb2-5-1vl-40-sunny-boy-2-5/sungrow-sg2-5rs-s

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