Since it’s winter, it seems like a good time to answer questions about storage. A reader recently asked about keeping his Airstream hooked up all the time, since he uses it all winter in the Pacific Northwest. He commented:
I built an RV pad on my property with 50amp, water and sewer hookups. I use a thermostatically controlled water hose to avoid that freezing. Trailer is always plugged in with full time heat and dehumidifier running. I do not disconnect the battery, and I use the trailer daily, like a full-timer.
“I do not winterize, but I do not store water in the tanks with the exception of the black which includes a 12v heater i keep on sub freezing days.
“Question is, am I doing this wrong? Are my water lines OK being that the trailer is always heated and on city water hook ups with the heated hose? Should I disconnect my battery via the storage kill switch when hooked up all winter?”
No worries, you’re doing everything right—and you’re lucky to be able to keep your Airstream stored at home with hookups! Since you live in a mild climate and keep the trailer warm, there’s really no risk of the plumbing freezing and there’s no need to winterize. The heated water hose you are using will prevent that from freezing up, too.
You definitely should not disconnect the battery if you are using the trailer. The battery provides a valuable function in the 12 volt system and the converter/charger is designed to be connected to a battery when the trailer is plugged in, even if you aren’t actually relying on the battery for power.
Turning on the “kill switch” (battery disconnect) won’t help preserve the battery—quite the opposite, actually. Disconnecting the battery means it won’t get any power from the converter and will slowly self-discharge. The disconnect switch is intended for storage situations when shore power isn’t available to keep the battery charged.
Sometimes people are concerned about the electrolyte (acid) in the battery “boiling off” as a result of a single-stage battery charger being plugged in constantly. The simple fix for this concern is to check the level of electrolyte in the battery every month or two and top it up with distilled water as needed. Take care when doing it, as you don’t want to splash acid on anything, including your skin, and always have some baking soda/water mixture on hand to neutralize a spill.
One thing to be cautious about on a freezing day: don’t try to operate the dump valves if they might be frozen. You can tear the rubber seals, which will cause the valves to leak forever after. (In this case, you’d need to replace the valves—a slightly unpleasant task.) It’s best to just wait for warmer temperatures before operating the dump valves. In a pinch, you could use a hair dryer to warm them up.
You’re smart to run a dehumidifier. In humid climates like the Pacific NW and the Gulf States it’s important to let the humidity out by opening the windows or running a dehumidifier. Long-term, excessive humidity will damage lots of things in the Airstream and leave unsightly stains on the curtains and walls.
Even in the drier northern states humidity can be a problem in the winter because people tend to keep the windows tightly shut to retain the heat. Unfortunately humidity from people, animals, cooking, and washing builds up, so if you don’t have a dehumidifier it’s a good practice to keep a window and a roof vent cracked slightly.