RVs use a lot of power and with all of our devices and added appliances, this power load increases. But you can't just use the power straight out of the shore power outlet for many of these electrical devices. RVs use two power systems, 12V DC power and 110V AC power. Converters are used to change the 110V AC power from the shore power to 12V DC power for your RV appliance and items such as lights, fans, vents, and more. The converter also works to recharge your batteries when you are hooked up to shore power, which means your batteries won't drain, further extending their lifespan. And since having access to battery power is so important for RV life, having a converter to charge the battery is equally important. DC output voltage (no load) approx.: 14.6/13.6/13.2V Fan control: proportional Dimensions: 7.8 x 9.5 x 3.5 Weight: 8 pounds Charges battery or powers 12V equipment Exact replacement for WF-9800 "Switch mode" type: 3-stage charging and fixed single output modes series Temperature controlled quiet internally mounted fan cooling Reverse polarity, overload, and thermal protection Works with both lead batteries and lithium batteries Includes LED indicator light Can also be wired in series or parallel to reach even higher power outputs Read more 35 Amps 45 Amps 55 Amps Max amp output continuous: 35 Amps 45 Amps 55 Amps Max power output continuous: 510 watts 650 watts 800 watts Max AC Current: 8 amps 9 amps 11 amps Typical efficiency: more than 85% more than 85% more than 85% 60 Amps 75 Amps 100 Amps Max amp output continuous: 60 Amps 75 Amps 100 Amps Max power output continuous: 875 watts 1095 watts 1460 watts Max AC Current: 11 amps 13 amps 15 amps Typical efficiency: more than 85% more than 85% more than 93%