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The Growatt SPA 4000TL3 BH inverter is a great choice for a battery energy storage system, and can be used as a stand-alone inverter or in combination with an existing solar inverter. It has a rated power of 4000 W. Thanks to its Uninterruptible Power Supply (UPS) function, it provides a continuous power supply. Compatible with a variety of batteries over a wide voltage range (100-550V).