Growatt's SPA series is a hybrid energy storage inverter designed for expanding PV-plus-battery systems - even if you already have an operational PV inverter (AC-coupled variants). Its standout feature is the UPS function, which enables seamless power supply to selected circuits during a grid outage, valued by single-family homes and small businesses.
Depending on the version, the series offers 2 MPPT, translating to better performance with differently oriented roof panels, string segmentation, and partial shading - the inverter can independently optimize the operation of two generator sections. High European efficiency ensures significantly better results in typical Polish climate conditions, not just in ideal laboratory settings.
Daily convenience is ensured by the Shine monitoring via an application and integration with communication modules (WiFi, and depending on configuration, wired solutions). The SPA series supports cooperation with energy storage systems (lithium and lead-acid), has required grid connection certificates for the European market, and includes the standard manufacturer's warranty, with the option for extension.
Ranking
Specifications
Pros and cons
The SPA (SPA 4000-10000 TL3 BH-UP) series is one of the few available on the European market for three-phase AC-coupled inverters, allowing for the integration of energy storage into an existing PV system without the need to replace the existing inverter. This represents real savings of between 2,000 and 4,000 zł compared to replacing the entire system with a DC-coupled hybrid system.
The switching time to battery power is less than 10 ms, which meets the requirements of sensitive devices (e.g., NAS, routers, Class I medical equipment). Competitive AC-coupled inverters (e.g., SolarEdge Energy Hub in AC backup mode) claim switching times of up to 20 ms, so SPA offers a real advantage in this area.
Compatibility with both major battery chemistries allows installers to choose more affordable lead-acid batteries when budgets are limited, or modern lithium-ion batteries (e.g., Growatt GBLI6531, BYD HVS) when higher energy storage requirements are needed - without needing to replace the inverter.
Two independent MPPTs (for the PV-input version) allow for the use of arrays with different orientations or partial shading, which, in the context of Polish pitched roofs, translates to an annual energy yield of 3-7% higher compared to a single-MPPT system with non-uniform strings.
The series includes connection certificates for European networks (VDE-AR-N 4105, EN 50549), which eliminates the risk of rejection by the local grid operator (OSD). The ShineServer platform and the Shine mobile application offer remote monitoring, alerts, and data export - without any additional subscription fees.
Growatt is not listed on BloombergNEF's bankable list, which means that obtaining external financing (such as leases or investment loans) for installations using this brand would be challenging. Companies like SolarEdge, Huawei FusionSolar, and SMA do have this status, which gives them an advantage in projects that require bank guarantees.
An AC-coupled configuration requires a double conversion of current during battery charging from a PV source (DC→AC via an existing inverter, AC→DC via a SPA), which reduces the charging/discharging cycle efficiency to approximately 88-91% compared to 95-97% in DC-coupled systems (e.g., Growatt SPH, Fronius GEN24 Plus). For systems with large daily cycles, this difference translates to a real annual loss of 2-4%.
Users and installers in Polish service providers (elektroda.pl, fotowoltaikaonline.pl) report occasional disconnections of the ShineServer, inaccurate data within the app, and delays in synchronization - a common issue affecting the entire Growatt platform, not just the SPA series. This is not a hardware failure, but it can make remote energy management more difficult.
Alternatives
StorEdge AC Coupled Single Phase Inverter (HD‑Wave) – SE5000H / H5000SE
5 kW
99.0%
-
9.0 kg
+1.8 pp efficiency, 21.0 kg lighter
About the SPA series
These answers cover the whole series. Where a figure differs, the specification above is this model's own.