Thanks to the 72 MultiCell technology (commercially available solar modules are only equipped with 36 cells), this series of modules guarantees optimal charging of the on-board battery(ies) at all times. Independent comparison tests have shown that doubling the number of cells not only brings about a significant increase in performance under optimal weather conditions, but also under adverse weather conditions and in partial shade. A sturdy junction box, resistant to pressurised water, is installed on the back of the module. A surrounding aluminium frame and specially hardened glass protect the modules even under the most adverse operating conditions. Performance guarantee 25 years.