Sunwoda Energy unveils 40 kWh storage system for homes, businesses

<p class="p1"><span class="s1">Chinese manufacturer Sunwoda Energy introduced a modular all-in-one energy storage system with up to 40 kWh capacity and 30 kW output for residential and small commercial use.</span></p><p>Chinese energy solutions company <a href="https://www.pv-magazine.com/2025/04/25/sunwoda-launches-the-worlds-first-10-metre-2-mwh-mobile-energy-storage-system/" rel="noopener" target="_blank">Sunwoda Energy</a> has introduced a modular all-in-one energy storage system (ESS) for homes and small businesses, the company said in a statement. The SunESS Power combines hybrid inverters and lithium-iron-phosphate (LiFePO₄) batteries in multiple configurations.</p>
<p>“At its core, SunESS Power integrates a module-level intelligent energy optimizer that boosts voltage from 51 V to 350–450 V, enabling flexible stacking and parallel operation,” the company said. “This feature allows mixing of new and old battery modules with different states of charge and health without calibration, improving lifetime throughput by more than 25%. Each module operates independently, with faulty modules automatically isolated to ensure uninterrupted performance.”</p>
<p>The system uses inverters with an output of 5–15 kW, and two can operate in parallel to reach 30 kW. Each inverter connects to one to four battery units, each with a capacity of 5 kWh. A single-inverter system can store 20 kWh, while two inverters in parallel double capacity to 40 kWh. All systems reach a maximum efficiency of 97.4% or higher.</p>
<p>“The system achieves 192.3 W/dm³ power density and 105 Wh/dm³ energy density, while being 40% thinner than comparable systems, making it especially suitable for urban homes and businesses with limited space,” the company said. The smallest configuration measures 650 mm in width, 833 mm in height, and 250 mm in depth, with a weight of 96 kg. The largest system, with two parallel inverters, measures 650 mm by 1,778 mm by 250 mm and weighs 252 kg, or 653 mm by 1,498 mm by 189 mm and 221 kg, respectively.</p>
<p>“The product’s robust construction with IP65 protection, corrosion resistance, and active thermal management—including built-in heaters—ensures stable operation across a wide range of climates, from cold winters at -20 C to hot summer conditions,” the company said. “Sunwoda backs the system with a 10-year warranty covering both the inverter and batteries.”</p>