Growatt SPF 3500-5000 is a hybrid off-grid inverter, designed for operation with a PV system, a battery, and optionally with the grid or a generator. In practice, this means reliable power supply for homes or off-grid facilities, as well as the construction of backup systems where uninterrupted operation and fast source switching are crucial.
The model philosophy of SPF focuses on flexible power supply and charging priorities - you can set when energy should prioritize loads and when it should charge the storage, facilitating autarky optimization. The series uses 1 MPPT, which performs well in simple setups with modules in one orientation, ensuring effective power tracking under varying sunlight conditions, though without the ability to handle different panel orientations.
High efficiency in real European conditions translates to fewer losses in daily operation and higher energy yields during the transitional seasons. Remote monitoring via WiFi or GPRS and Growatt platform tools for monitoring and configuration are available. The devices are compatible with lithium and lead-acid batteries, and power scaling facilitates parallel operation. The series is primarily targeted at residential and small commercial installations, where energy independence and easy expansion are key, with certification and warranty considerations typically aligned with the distribution market.
Ranking
Specifications
Pros and cons
The SPF series supports parallel operation of up to 6 units (6 × 5 kW = 30 kW) without the need to replace the central inverter. This is a key advantage over the competition in the off-grid segment up to 5 kW, where expansion typically requires a migration to a different hardware platform.
The device allows for independent configuration of energy source priorities (PV first / battery first / utility first) and charging schedules, enabling precise optimization of self-consumption and battery cycle management without the need for an external controller.
SPF 3500 ES accepts up to 80A of MPPT current, and SPF 5000 ES accepts up to 100A at a PV input voltage of 120-450 VDC. This allows for the connection of a PV array with a power of up to 6 kWp for the 5000 ES model, which is a common practice in off-grid installations - intentionally exceeding the inverter's capacity.
The SPF series can operate solely with PV, without an attached battery. This simplifies phased installations: the system starts as a standalone off-grid PV system, and the energy storage system can be added later without replacing the inverter.
The built-in support for WiFi and GPRS modules (Shine Link) and integration with the Growatt ShineServer platform allow for real-time monitoring and reconfiguration of parameters. For residential and small commercial installations, this is a complete solution without the need for additional licenses.
The series only features one MPPT tracker, which prevents the independent operation of arrays with different orientations or tilt angles. In installations with two arrays (e.g., east-west), performance losses of 5-15% compared to inverters with 2 MPPT trackers (e.g., Victron MultiPlus-II with an external SmartSolar MPPT) are unavoidable.
On the DIY Solar Power Forum (threads from 2021-2024), multiple instances of synchronization errors, protective shutdowns, and equipment damage were reported when operating 2+ SPF 5000 ES units in parallel. Growatt requires the presence of batteries to maintain synchronization; disconnecting the BMS can lead to phase displacement and activation of differential protection.
Growatt is not listed on the BNEF Tier-1 bankable manufacturers list for inverters, which is a direct limitation for projects requiring external financing (leasing, investment loans). Competitors such as SMA and Fronius have this status, which translates into easier acceptance by banks and financial institutions.
The standard factory warranty is 2 years (extendable to 5 years for an additional fee). For comparison, Victron Energy offers a 5-year warranty standard, and SMA Sunny Island offers a 5-year warranty. A shorter standard warranty period increases the risk of service costs after the warranty expires, especially in critical applications (backup power for medical facilities, industrial sites).
Alternatives
About the SPF 3500~5000 series
These answers cover the whole series. Where a figure differs, the specification above is this model's own.