Growatt SPH BL-UP hybrid inverters are for home installations, combining grid connection with energy storage and backup power. In practice, this means smooth self-consumption management - excess from PV can go to the battery instead of the grid, and when the power fails, the inverter can switch to backup power, maintaining critical circuits. The applied independent MPPT facilitates optimization of yield even with panels at different angles or partial shading - each string of modules can operate at its maximum power point. High European efficiency translates into significantly better energy production in typical operating conditions, not just in laboratory measurements. Plus convenient monitoring and communication via WiFi or Ethernet modules and the app, making it easier to track battery consumption and operation. The series is compatible with energy storage systems (including LiFePO4) and usually offers a long warranty - often up to 10 years, depending on configuration.
Ranking
Specifications
Pros and cons
The datasheet confirms a peak efficiency of 97.2% and a European efficiency of 97% with MPPT tracking accuracy ≥99.5%. These figures are on par with the mid-range Fronius Symo GEN24 (~97.3% EU), translating to measurably lower conversion losses across a typical daily generation cycle.
The Emergency Power Supply switchover time is below 10 ms, meeting IEC 62040-3 Class S UPS requirements and ensuring uninterrupted operation of sensitive loads - routers, NAS devices, and small appliances - without resets or reboots.
Two independent MPPT trackers with a DC input voltage up to 550 V allow two strings with different orientations or tilt angles to be connected without power optimizers, reducing system CAPEX and minimizing potential failure points.
The inverter supports up to four GBLI 6.5 kWh modules (26 kWh total) or up to six ML33TRA 3.3 kWh modules (19.8 kWh), with native LiFePO4 chemistry support - enabling storage capacity to be expanded without replacing the inverter as energy needs grow.
The IP65-rated enclosure allows outdoor and garage installation without additional weatherproofing. The onboard Wi-Fi module - alongside optional Ethernet/RS485 connectivity and the ShinePhone app - enables full real-time performance monitoring and seamless integration with energy management systems.
Growatt does not appear on the BloombergNEF Tier 1 Power Inverter Manufacturers list (confirmed by manufacturer data: tier_1_bankable: false), unlike Sungrow, Fronius, or SolarEdge. This may present a barrier when seeking project financing for commercial and C&I installations where lenders require Tier 1 inverter status.
The base manufacturer warranty is 5 years; extension to 10 years is available but depends on the distributor or a separately purchased service package. By comparison, Fronius includes a 5+5-year warranty as standard and SolarEdge offers 12 years - placing the SPH BL-UP below the premium segment without additional cost.
The 42-59 V battery voltage range (48 V nominal) results in high charge/discharge currents - approximately 100 A at 5 kW - requiring cable cross-sections of ≥50 mm² and introducing greater resistive losses. Competing solutions such as the Huawei LUNA2000 and BYD HVS operate on high-voltage (HV) architectures (200-550 V), significantly reducing current levels and thermal losses.
Alternatives
About the SPH BL-UP series
These answers cover the whole series. Where a figure differs, the specification above is this model's own.