It's a disconnect, as recommended in correspondence on this site. It allows select 1, 2, or both.
When not using my trailer the batteries will serve another purpose. That's why I chose battery boxes that have external posts.
The space available on the tongue led me to the end-to-end arrangement. I hadn't considered side-to-side and haven't built the rack yet, but I don't think that will fit. I'll evaluate that possibility.
The box in the middle minimizes the distance from the switch to the battery post. It has a snap-on top and will also serve as a storage box. I'll mount that box permanently to the rack. The others will be removed after each trip for storage (and use) at home.
The new batteries are a matched pair of group 27 deep cycles. The original is a group 24 dual purpose. Most trips don't involve dry camping. If I can't sell the G24 I may carry it, alone.
The switch makes that easy. It also allows using and charging a mixed pair without burning out the smaller one. That was the original plan.
I later decided to buy the second new battery for long-term maintenance reasons. Left on a continuous charger at home, together, it seems that a matched pair requires less attention than a mixed pair, to avoid potential damage. It also gets me greater capacity between charges for longer dry-camping trips.
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Chris Cowles, Gainesville, FL
- 2014 Shamrock 21DK
- 2005 Dodge Durango Hemi Limited 4x2