Delaware does not get all that cold, so freezing a battery is not as big of an issues as it is in other parts. I am not familiar with your on board converter. There should be a model number on it, probably right inside the cover. Google the make and model and you should find all the info you need. If it is a three stage you will be fine. If you cannot determine if the charge is a three stage, you could pull the fuse at the battery, then every few months put the fuse back in and charge the battery up for a few days. Then remove the fuse and disconnect the shore power.
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