The WF-9580 model provides 80 Amp and a clean, constant 13.6-Volt DC nominal output for reliable operation of electronics and appliances. Automatic 3-stage charging extends the life of your battery with output voltage modes of 13.2-Volt DC range float mode, 13.6-Volt DC range absorption mode and a 14.4-Volt DC range bulk charge mode. The 9500 Series also maintains peace and quiet, as the cooling fan runs only when needed. This product ships in approximately 1 days