Automatic three-stage charging provides superior 12V system performance, while maintaining the ideal charge and maintenance of your battery. WF-8740-P model converters provide 40 Adc output and a highly reliable nominal 13.6V with or without a battery. No extra filtering is required. WFCOUs three-stage battery charging results in longer battery life and is totally automatic. Nominal voltage output modes are a 13.2V range float mode, 13.6V range absorption charge mode, and a 14.4V range bulk charge mode. Short-circuit and reverse polarity protection provide you with further reliability and peace of mind. The cooling fan for the WF-8740-P operates only when needed and ensures quiet operation. Front-cooled fan installation does not create additional installation space requirements.This model is designed to comply with FCC Class B, which means that the converters do not cause interference with televisions, radios or other signals. It also brings you the convenience of built-in AC and DC distribution. 30A main AC breaker and a total of up to five 20A branch AC circuits can be installed. Six DC branch circuits include LED lights that illuminate to indicate open circuits other signals. Output Power: 40A DC output Input: 105-130 VAC, 60 Hz Output Ranges: Nominal (Absorption Mode) 13.6V (includes charging and load) Boost (Bulk Mode) 14.4V Trickle (Float Mode) 13.2V (after 48 hrs.) Dimensions: 11-3/4"W, 8-1/4"H, 5"D.