2010 Design of an outdoor Solar-Inverter. The Mastersol CS20TL is a 20-KW solar inverter with a very high efficiency of more than 98%. The device can be mounted in an outdoor environment, thanks to an IP65 sealed electronic compartment. During installation the device is easy to handle, thanks to the integrated handlebars, which also provide the product the required ruggedness. The "optima cooling system" provides improved efficiency and a long life. The electric fans are fitted in a detachable frame for easy servicing. The product won the German IF-design award in 2010.