The Sigenergy Sigen Hybrid Inverter SP2 5.0kW 1-Phase (manufacturer model code Sigen Hybrid 5.0 SP2) is Sigenergy's 2nd-generation single-phase hybrid inverter, engineered under the brief "Slim. Silent. Strong." It is built around an industry-slimmest, fanless die-cast metal body just 99mm deep — described by Sigenergy as roughly the depth of "a deck of cards" — and converts and coordinates solar power, battery storage, and home loads for residential energy storage and backup scenarios.
With no internal or external fans, the SP2 delivers an ultra-low noise level of just 25dB, described by Sigenergy as a "soft whisper," making it suitable for mounting close to living or sleeping spaces. It is future-ready for battery integration: supplied as a cost-effective standalone PV inverter, it can be upgraded into a full storage and backup system at any time by adding a Sigen Battery Controller (SigenStor BC) and one or more Sigen Battery (SigenStor BAT) modules, without replacing the inverter itself.
5.0kW
AC Output Power
2 MPPT
Trackers
99mm
Ultra-Slim Depth
25dB
Super Silent
98.3%
Max Efficiency
200%
Off-Grid Peak Power
Single-Phase Model
This is a single-phase hybrid inverter, suited to properties with a single-phase electricity supply, which covers the large majority of UK homes. Properties with a three-phase supply should specify the equivalent Sigen Hybrid TP2 three-phase model.
When to Use This Inverter
The mid-range model in the SP2 lineup, this size fits the majority of typical UK family homes. It suits 3–4 bedroom properties with a PV array in the 5–9kWp range and moderate-to-high daytime electricity use (electric showers, dishwashers, EV charging). Its slim 99mm-deep enclosure makes it easy to fit in garages and utility spaces where wall depth is at a premium, and its near-silent running suits installations on walls shared with living or sleeping areas.
Using This Inverter With SigenStor
This Sigen Hybrid Inverter (SP2) is a genuinely standalone product: on its own, it works purely as a solar PV inverter, feeding generated power to the home and grid with no battery involved. Unlike Sigenergy's earlier all-in-one Energy Controller range, the battery management and EMS intelligence for this 2nd-generation platform live in a separate unit — the Sigen Battery Controller (SigenStor BC) — rather than inside the inverter itself. To build a full storage and backup system, this inverter, a Sigen Battery Controller, and one or more Sigen Battery (SigenStor BAT) modules (1–6 per controller) are wired together as a stack, with the BC coordinating charge/discharge and energy flow between solar, battery, home, and grid. Once storage is added, the system also supports Sigen AI mode with dynamic tariffs and VPP participation via the mySigen app, alongside smart load integration.
Ultra-Slim, Fanless Body
Just 99mm deep die-cast metal enclosure with enhanced heat dissipation and no internal or external fans, for a compact wall footprint and long-term mechanical reliability.
25dB Whisper-Quiet Operation
One of the quietest hybrid inverters in its class at just 25dB, suited to installation near bedrooms, home offices, or living spaces without disturbing the household.
Industry-Leading Efficiency
Up to 5.0 nominal output with maximum efficiency figures at the top of the single-phase hybrid inverter class, helped by advanced power electronics design.
200% Off-Grid Peak Output
Delivers 2× nominal output power for 10 seconds when off-grid, giving a strong instantaneous boost for motor start-up loads such as pumps or compressors during a backup event.
Future-Ready Battery Integration
Battery-ready and future-proof: begin with solar-only generation and add a Sigen Battery Controller and Sigen Battery modules later to unlock storage, backup, and smart tariff features without swapping the inverter.
IP66-Rated, Wide-Range Enclosure
Fully weatherproofed to IP66 and rated for continuous operation from -30°C to 60°C, suiting exposed or unheated UK installation locations.
DC Input
Max. PV power
10000 W
Max. DC input voltage
600 V
Nominal DC input voltage
350 V
Start-up voltage
100 V
MPPT voltage range
50 – 550 V
Number of MPPT trackers
2
PV strings per MPPT
1
Max. input current per MPPT
16 A
Max. short-circuit current per MPPT
22 A
AC Output (On-Grid)
Nominal output power
5000 W
Max. output apparent power
5500 VA
Nominal output current
22.7 A
Max. output current
25.0 A
Nominal output voltage
220 / 230 / 240 V
Nominal grid frequency
50 / 60 Hz
Power factor
0.8 leading – 0.8 lagging
Total current harmonic distortion (THDi)
< 3%
Max. efficiency
98.3%
European efficiency
98.3%
AC Output (Backup)
Peak output power (10 seconds)
2× nominal output power
Nominal output voltage
220 / 230 / 240 V
Nominal output frequency
50 / 60 Hz
Power factor
0.8 leading – 0.8 lagging
Total voltage harmonic distortion (THDv)
< 3%
Disruption time of backup switch
0 ms (with Sigen Energy Gateway, Battery Controller & Battery)
Battery Integration (Requires Separate Components)
Battery controller model
SigenStor BC (sold separately)
Battery module model
SigenStor BAT series (sold separately)
Number of battery modules per controller
1 – 6 pcs
Battery module voltage range
300 – 600 V
Protection
Safety features
DC reverse polarity protection, insulation monitoring, residual current monitoring, arc fault circuit interrupter, AC over-current/over-voltage/short-circuit protection, Type II DC/AC surge protection, anti-islanding protection
Do I need the Sigen Battery Controller (BC) to use this inverter?
No, not to begin with. The Sigen Hybrid 5.0 SP2 operates on its own as a standalone grid-tied PV inverter straight out of the box. The Sigen Battery Controller (SigenStor BC) is a separate unit you add only when you want to connect Sigen Battery (SigenStor BAT) storage modules — on this 2nd-generation platform, the battery management and EMS functions live in the BC, not in the inverter itself.
What's the difference between this inverter and the Sigen Battery Controller?
They are two different products designed to work together. The Sigen Hybrid Inverter handles solar generation and grid/AC conversion. The Sigen Battery Controller (SigenStor BC) is a separate wall-mounted unit that sits between the inverter and the battery packs, managing battery charge/discharge and energy flow. Both are required, along with at least one Sigen Battery module, to build a complete storage-and-backup system.
How many solar panels can I connect?
That depends on your panel wattage and array design, but the inverter's DC/AC oversizing ratio of up to 2.0 means the connected PV array can significantly exceed the inverter's AC output rating. An MCS-certified installer should confirm string sizing against the MPPT voltage window and your specific panels.
Can this inverter provide backup power during a grid outage?
Backup/off-grid operation requires the inverter to be paired with a Sigen Battery Controller and at least one Sigen Battery module. To achieve a 0ms load-side disruption time, a Sigen Energy Gateway is also needed alongside the inverter and battery. As a standalone PV-only installation, the inverter will not export or supply loads during a grid outage, in line with normal anti-islanding protection.
How quiet is this inverter in practice?
Sigenergy rates the SP2 at 25dB, achieved through a fully fanless design with no internal or external moving parts. This is comparable to a quiet library and suits mounting on walls close to bedrooms or living areas.
Where can this inverter be installed?
Its IP66 ingress protection rating and -30°C to 60°C operating range make it suitable for wall-mounting outdoors, in a garage, or in a plant room. Its slim 99mm depth also makes it easier to fit in narrow utility spaces than bulkier inverter designs.
