According to their website WFCO converters provide 12 vdc even without a battery:
WF-9855 55 Amp Power Converter
The WF-9800 Series converter/chargers are versatile, advanced power source solutions. The WF-9855 model provides 55 amps of clean, reliable DC power, which is ideal for powering electronics and appliances. The 9800 Series provides clean power, even without filtering from a battery. Quiet operation is assured as the cooling fan runs only when needed.
Another advantage is FCC Class B compliance for the WF-9855 model, which means that the converter does not cause interference with televisions, radios or other signals. Automatic three-stage battery charging maintains your battery’s life with three nominal voltage output modes: 13.2 Vdc range “float” mode, 13.6 Vdc range “absorption” mode, and a 14.4 Vdc range “bulk” charge mode. Electronic current limiting automatically shuts down the power during overload or short-circuit conditions.
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