The Easun Power SMP inverter series are off-grid solutions designed for the independent operation of PV installations in homes, on plots, on farms, and anywhere reliable power matters, especially during grid outages. These are all-in-one constructions combining a sinusoidal inverter with a battery charger and an MPPT regulator, simplifying installation and making cabling more organized. The use of MPPT allows for better utilization of module yields under real-world conditions - such as partial shading, different roof orientations, or uneven sunlight exposure. High European efficiency means the inverter operates effectively not only under ideal conditions but primarily under the typical load ranges found in Poland, translating to more useful energy throughout the year. Depending on the version, the series offers convenient monitoring via WiFi and remote parameter viewing in an app, as well as communication for integration with BMS, facilitating cooperation with energy storage systems. This is an excellent choice for users seeking stable performance, user-friendly operation, and practical safety features, especially in residential and small commercial projects.
Ranking
Specifications
Pros and cons
The SMP series combines a sinusoidal inverter, an MPPT charge controller, and a battery charger into a single unit. This eliminates the need to purchase and wire a separate charge controller, which, in a typical 5 kW off-grid installation, reduces component and labor costs by approximately 300-600 zł compared to modular systems (e.g., Victron MultiPlus + SmartSolar).
In an independent comparative test (diysolarforum.com), the SMP 5KW model generated 12% more energy in a day than Growatt and 6% more than Victron under similar weather conditions. It also demonstrated a faster start time (6:12 vs 6:30 Victron and 6:45 Growatt). The technical documentation indicates a tracker efficiency of >99%, with a DC input range of 120-500 V.
The option to parallel up to 9 SMP inverters (with an optional communication kit) allows for the creation of off-grid systems up to 45 kVA without the need to replace the inverter when expanding the installation - this is a significant advantage over the Chinese all-in-one segment, where parallel operation is rarely available at a premium price.
Remote monitoring via WiFi with parameter viewing in a mobile app, and communication with BMS (compatible with lithium and LiFePO4 batteries), are standard features available in the SMP series without additional costs. In contrast, competing brands (e.g., Studer, Victron) charge separately for communication modules, typically ranging from 200 to 500 zł.
Easun Power maintains its own warehouses in Poland and Germany (verified on easunpower.com), which reduces delivery times to 3-7 business days and eliminates the risk of import duties for customers in the EU - a significant advantage over brands that only sell from China (e.g., PowMr, MPPSolar).
Multiple documented cases on Trustpilot (2024) and diysolarforum.com: no service response for over a month, charging fees for defective replacement parts (~$35 for a replacement screen), ceasing communication during an active warranty claim. One user reported 3 consecutive defective units from 10 purchases. Lack of an authorized service network in Poland.
The SMX II model, with a power output of 5.6 kW, consumes approximately 50 W in standby mode (≈1,200 Wh/day), which, in off-grid systems with limited winter production (e.g., in Poland, December-January), could result in a daily battery discharge of 10-15% of a 100 Ah/48 V battery's capacity. The Victron Quattro 5 kVA model consumes approximately 25 W.
On DIY forums (diysolarforum.com, elektroda.pl), failures were reported in SML/SMX series models after 3-6 months of operation (requiring daily restarts, sudden inverter shutdowns). Easun Power does not manufacture its own components - the level of quality control is limited, and clones bearing the Easun brand are circulating on the market, which makes it difficult to assess the actual reliability of the SMP series.
Alternatives
About the SMP series
These answers cover the whole series. Where a figure differs, the specification above is this model's own.