Quote:
Originally Posted by sourdough
I've had a watering system on my trailers for several years with no ill effects or worries of freezing. All the cells of the batteries are connected by tubing that is fed by a longer tube with a squeeze bulb on it. You immerse the end of the feed hose into a bottle of distilled water and pump water in until it's full - it has a one way in live valve that prevents water from backing out under pressure. When the cells are full (bulb will not compress) you just pull the hose from the distilled water jug, disconnect the lower fill line and drain then depress the one way valve to drain the lines at the batteries. There is no water to freeze anywhere other than what's in the battery being charged. It is hands down (light years) better than trying to top off batteries the "old fashioned way".
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There's two (maybe even more) types of "battery watering systems".
The one you have is a manual system, squeeze the bulb to add water.
Another type is the "fully automatic type" that uses gravity to keep the battery cells filled with water from a "always connected tank".
That's the type I was referring to. With a container of distilled water sitting above the batteries, as soon as the temperature falls below freezing, all the lines will be "solid ice" and the watering system will stop working.
Here's a couple of figures to show the difference. Yours, no problem with cold weather. The gravity system, however..... NOPE...