Alientek EL15 DC Electronic Load | 150W Programmable CC CV CR CP Load. . Alientek The Alientek EL15, a compact yet powerful 150W programmable DC electronic load designed for power supply testing, battery capacity testing, charger testing, and DC-DC converter validation. The EL15 supports Constant Current (CC), Constant Voltage (CV), Constant Resistance (CR), and Constant Power (CP) modes, along with dynamic load testing, automatic testing, battery capacity measurement, and DC internal resistance