Long Term Storage in humid area

[Navy Bob]

We have stored our Cedar Creek from mid March to early December for 4 years in an RV park in central Florida. We have not been able to hook up to electricity but now we will be another RV park where we will have electric. We used many things in past to fight mold/mildew. Kitty litter, natural charcoal, Damp Rid ( a lot) and Home Zone and have never had a problem.
My questions - with electric -
1. I was thinking of buying a dehumidifier, putting it on the kitchen island and draining it down the sink. Do you think it would fill the gray tank in 9 months? Do you see a negative?
2. To keep the coach batteries charged should I just run the inverter/charger as normal or should I connect batteries to a Battery Tender (or similar) to have more refined charging?

[Rich5117]

Answer to first question Yes. We use a Eva Dry 4000 all year long, while out and while at home, many times it will do a gallon a day depending on just how humid it is. If it is possible I would try to find a way to get the hose outside or get a fitting to attach a garden hose to your gray tank and see if you can keep it open to drain it. When our slides are in I can push a 3/8 inch hose out the bottom corner of our slide out. The Eva Dry keeps it at 45 to 50 %.

This is just my opinion, when we are home I use a battery tender plus. The when we are gone I switch it to our other vehicle. Takes care of both, been doing this for several years while we are south in winter.