Deye 3 kW vs 5 kW Hybrid Inverter: SUN-3K-SG04LP1-EU vs SUN-5K-SG04LP1-EU
The SUN-3K-SG04LP1-EU and the SUN-5K-SG04LP1-EU are two single-phase hybrid inverters from the same Deye series: the same 330 × 433 × 228 mm cabinet, the same 17 kg, the same 97.6 % maximum efficiency and the same 40–60 V battery voltage range. The SUN-3K-SG04LP1-EU has a rated AC output power of 3000 W and the SUN-5K-SG04LP1-EU a rated AC output power of 5000 W, and the difference does not stop at the output: the 5 kW unit has two MPPT inputs where the 3 kW unit has one, accepts more PV power, and moves more current to and from the battery. This comparison reads the two product records row by row, so you can see which rating your loads and your roof need.
Specifications side by side
Every figure in this table is read from the product’s own record — the same rows each product page shows.
| Specification | Deye 3 kW Single-Phase Hybrid Solar Inverter SUN-3K-SG04LP1-EU | Deye 5 kW Single-Phase Hybrid Solar Inverter SUN-5K-SG04LP1-EU |
|---|---|---|
| Rated AC Power | 3000 W | 5000 W |
| Max Efficiency | 97.6 % | 97.6 % |
| Number of MPP Trackers | 1 | 2 |
| European Efficiency | 96.5 % | 96.5 % |
| Max AC Apparent Power | 3300 VA | 5500 VA |
| Max PV Array Power | 6000 W | 10000 W |
| Max PV Input Power | 4800 W | 8000 W |
| MPPT Voltage Range | 150 ~ 425 V | 150 ~ 425 V |
| Peak / Surge Power (W) | 2× rated | 2× rated |
| AC Grid Connection Type | L+N+PE | L+N+PE |
| AC Coupling Support | Yes | Yes |
| Supported Battery Type | Lead-acid or Lithium-ion | Lead-acid or Lithium-ion |
| Battery Voltage Range | 40 ~ 60 V | 40 ~ 60 V |
| Max Charge Current | 70 A | 120 A |
| Max Discharge Current | 70 A | 120 A |
| Max PV Input Current | 13 A | 13 A |
| Max PV Input / Array Open Circuit Voltage | 500 V | 500 V |
| MPPT Efficiency | 99 % | 99 % |
| Rated AC Output Current | 13.6 A | 22.7 A |
| Grid / AC Frequency | 50/45-55, 60/55-65 | 50/45-55, 60/55-65 |
| Nominal AC Voltage | 220/230 | 220/230 |
| Start-up Voltage | 125 V | 125 V |
| Strings per MPP Tracker | 1 | 1 |
| THD / THDi | 3 % | 3 % |
| Warranty | 10 years | 10 years |
| Phase | L+N+PE | L+N+PE |
| AC Voltage Tolerance (xUn) | 0.85 ~ 1.1 | 0.85 ~ 1.1 |
| Battery Parallel Support | Yes | Yes |
| Charge/Discharge Time Periods | 6 | 6 |
| Charging Strategy | Self-adaption to BMS | Self-adaption to BMS |
| Topology | Non-Isolated | Non-Isolated |
| Max AC Output Current | 15 A | 25 A |
| Pass-Through / Bypass Current | 35 A | 40 A |
| Max PV Short-Circuit Current | 17 A | 17 A |
| Number of Battery Inputs | 1 | 1 |
| Max. Parallel Units | 16 | 16 |
| Adjustable Power Factor Range | 0.8 ~ 0.8 | 0.8 ~ 0.8 |
| MPPT Nominal Voltage | 370 V | 370 V |
| Dimensions (W×H×D) | 330×433×228 mm | 330×433×228 mm |
| Weight | 17 kg | 17 kg |
| Derating Start Temperature | 45 °C | 45 °C |
| IP Rating | IP65 | IP65 |
| Noise Level | 30 dB | 30 dB |
| Operating Temperature | -40 ~ 60 °C | -40 ~ 60 °C |
| Max Altitude | 2000 m | 2000 m |
| Relative Humidity | 0 ~ 100 % | 0 ~ 100 % |
| Cooling | Natural Cooling | Natural Cooling |
| Over-Current Protection | Yes | Yes |
| Over-Voltage Protection | Yes | Yes |
| AC Short-Circuit Protection | Yes | Yes |
| Anti-Islanding Protection | Yes | Yes |
| DC Component Monitoring | Yes | Yes |
| DC Reverse Polarity Protection | Yes | Yes |
| Generator Support | Yes | Yes |
| Protection Features | Yes | Yes |
| Overvoltage Category | OVC II(DC), OVC III(AC) | OVC II(DC), OVC III(AC) |
| Residual Current Monitoring Unit | Yes | Yes |
| AC/DC Surge Protection | TYPE II(DC), TYPE II(AC) | TYPE II(DC), TYPE II(AC) |
| Communication Interface | RS485, RS232, CAN | RS485, RS232, CAN |
| DC Switch | Yes | Yes |
| Display | Colorful Touch LCD | Colorful Touch LCD |
| Monitoring Module | GPRS, Wi-Fi, Bluetooth, 4G, LAN (optional) | GPRS, Wi-Fi, Bluetooth, 4G, LAN (optional) |
| Over-Temperature / Thermal Protection | Yes | Yes |
| Additional Note | DC Injection Current (% of In): <0.5 | DC Injection Current (% of In): <0.5 |
AC output: 3000 W or 5000 W
The SUN-3K-SG04LP1-EU has a rated AC output active power of 3000 W and a maximum apparent power of 3300 VA; its rated AC output current is 13.6/13 A. The SUN-5K-SG04LP1-EU has a rated AC output active power of 5000 W, a maximum apparent power of 5500 VA and 22.7/21.7 A. Both records state the same peak power — twice the rating for 10 seconds — and the same 220/230 V output on an L+N+PE connection. The continuous AC pass-through current is 35 A on the SUN-3K-SG04LP1-EU and 40 A on the SUN-5K-SG04LP1-EU. Add up the loads that run at the same time: if they pass 3000 W, the smaller inverter is not the one to buy.
Solar input: one MPPT or two
This is the row that separates them most. The SUN-3K-SG04LP1-EU has 1 MPPT with one string, a maximum PV input power of 4800 W and a maximum PV access power of 6000 W. The SUN-5K-SG04LP1-EU has 2 MPPTs with one string each, 8000 W of PV input power and 10000 W of PV access power. Each MPPT input takes a maximum operating current of 13 A. The voltage limits are identical: 500 V maximum PV input, an MPPT range of 150–425 V and a 125 V start-up voltage. Two MPPTs let you wire two roof faces separately; with one MPPT every panel sits in a single string.
Battery side: 70 A or 120 A
Both inverters work with a lead-acid or lithium-ion battery in a 40–60 V battery voltage range, both have one battery input, and both adapt their charging to the battery's BMS. The SUN-3K-SG04LP1-EU has a maximum charge current of 70 A and a maximum discharge current of 70 A. The SUN-5K-SG04LP1-EU has a maximum charge current of 120 A and a maximum discharge current of 120 A. Both records list six charge/discharge time periods, AC coupling support, diesel generator support and up to 16 units in parallel.
What does not change with the rating
The SUN-3K-SG04LP1-EU and the SUN-5K-SG04LP1-EU share a maximum efficiency of 97.6 % and a European efficiency of 96.5 %. Both are IP65, naturally cooled and rated below 30 dB; both operate from -40 to 60 °C with derating starting at 45 °C, up to an altitude of 2000 m. Both carry a colour touch LCD, RS485, RS232 and CAN interfaces, a DC switch and a 10-year warranty. Nothing about the enclosure, the installation or the monitoring changes with the rating.
Which one for which load
Choose the SUN-3K-SG04LP1-EU when the loads you run together stay under its rated output power of 3000 W, your array fits one string, and a maximum charge current of 70 A is enough for your battery. Choose the SUN-5K-SG04LP1-EU when loads reach toward its rated output power of 5000 W, when the panels sit on two roof faces or need a second string, or when you want a maximum charge current of 120 A. Because the cabinet and the weight are the same, wall space is not a reason to pick the smaller one.
Where each one fits, and where it does not
Deye 3 kW Single-Phase Hybrid Solar Inverter SUN-3K-SG04LP1-EU
Best for
- Buildings on a single-phase supply
- Battery backup through power cuts, with solar stored for the evening and night
- Lithium or lead-acid battery banks
- Sites that also run a diesel generator
- Apartments and small homes
- Outdoor installation (IP65 enclosure)
Deye 5 kW Single-Phase Hybrid Solar Inverter SUN-5K-SG04LP1-EU
Best for
- Buildings on a single-phase supply
- Battery backup through power cuts, with solar stored for the evening and night
- Lithium or lead-acid battery banks
- Sites that also run a diesel generator
- Apartments and small homes
- Outdoor installation (IP65 enclosure)
Winner
SUN-5K-SG04LP1-EU for two roof faces, a larger array and loads up to 5000 W; SUN-3K-SG04LP1-EU for a single string and loads under 3000 W
Conclusion
Between these two the records decide quickly. The SUN-3K-SG04LP1-EU offers a rated output power of 3000 W, one MPPT and a maximum charge current of 70 A; the SUN-5K-SG04LP1-EU offers a rated output power of 5000 W, two MPPTs and a maximum charge current of 120 A — in the same 17 kg cabinet, with the same efficiency and the same 10-year warranty. Match the rating to the loads you run at once and the MPPT count to your roof. The price shown on each product page is the price you pay.