WFCO/Arterra WF-8955-MBA Replaces the lower power converter section of any WFCO 8900 Series converter. Installs easily with only four screws and five wires, so you'll be up and running again quickly. All WFCO converters including main board assemblies are provided with three stage electronic switch mode design. Output: absorption 13.6V DC range (includes charging and load) bulk 14.4V DC range float 13.2V DC range.