The Easun Power iSolar SPH series consists of off-grid inverters designed for autonomous operation with batteries and PV systems - ideal where energy independence matters (homes, cabins, farms, small commercial buildings). In practice, they stand out due to their simple, clear configuration via the display and stable operation with pure sine wave, enabling seamless cooperation with sensitive electronics and standard home appliances.
This series employs MPPT, which helps maintain high energy yields under varying sunlight conditions. This is especially beneficial in case of partial shading or suboptimal module positioning, as the power-point tracking system can better utilize available sunlight.
A further advantage is WiFi monitoring - in practice, remote viewing of the system's operation and basic parameters via the SolarPower app. The manufacturer also offers standard protection and service within the warranty scope (typically 12-24 months, depending on the sales channel).
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Specifications
Pros and cons
The pure sine wave output (THD <3%) ensures safe operation with sensitive devices: household appliances, medical equipment, and pumps with inverters. This is an advantage over cheaper models that produce modified sine waves, which can damage motors and electronics.
The SPH series supports the parallel connection of up to 9 inverters, which allows the system's power to be scaled from a few kW to approximately 50 kW without the need to replace equipment. This is a practical advantage for facilities with increasing energy needs (farms, workshops).
The integrated Wi-Fi module and SolarPower app (Android/iOS) allow for remote monitoring of system parameters without incurring additional costs for a communication gateway - while competitive brands (e.g., Victron) offer Wi-Fi/GSM modules as a paid option.
The SPH series supports both lead-acid (AGM, GEL, Flooded) and lithium-ion (LiFePO4) batteries, with a configurable charging profile - which makes it easy to upgrade existing systems without replacing the entire system.
Operating parameters (priority of power sources, charging thresholds, UPS mode) are set directly from the built-in display and keyboard - eliminating the need to connect a laptop or install software, which lowers the barrier to entry for users without technical expertise.
The standard Easun Power warranty is 12 months (as confirmed in the product documentation). Major competitors in the off-grid segment - Victron Energy (5 years), Growatt (5 years), and Deye (5 years) - offer significantly longer coverage, which translates into a real risk of service costs after one year of operation.
On the DIY Solar Power Forum (in the thread 'SolarPower, SmartESS, WatchPower mostly down'), users reported frequent server outages, delays in data retrieval (updates every 5 minutes), and the inability to remotely restart the WiFi module. This significantly limited the functionality for users who relied on remote monitoring.
The SPH 3KVA model is equipped with a PWM controller (Voc PV max. 80 V, PV power max. 1200 W), not an MPPT controller - even though the entire SPH series is marketed with MPPT technology. The PWM controller recovers approximately 10-15% less energy in shaded or suboptimal mounting angle conditions compared to an MPPT controller of the same power class.
Users on elektroda.pl and DIY Solar Power Forum report a zero-power consumption of 40-50 W for 5-6 kW models (approximately 1.0-1.2 kWh/day). When using an off-grid system powered solely by batteries, this translates to a real daily capacity loss even when there is no load.
Alternatives
About the iSolar SPH series
These answers cover the whole series. Where a figure differs, the specification above is this model's own.