$$ Price: Based on data from Solar Choice's network of solar installers, the average price for an installed SolaX battery is $900–$1,050 per usable kWh, making it one of the lower-cost batteries available on the market. 3 kWh (T63) is a high-performance, high-voltage lithium battery designed for seamless residential energy storage. Using advanced NMC high-density solar battery technology, this compact unit offers a robust 6. 3 kWh capacity while maintaining a sleek, space-saving footprint. This helps reduce reliance on the grid, maximize self-consumption, and optimize renewable energy use for homes and businesses. Compare prices for solar products with one click and save on every purchase. This product has no reviews yet. Priced between €5,000 and €7,000 in European markets like Germany, this 6.