Water Miser Caps venting water [RE-wrenches]

[Windy Dankoff, Dankoff Solar]

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>Wrenches,
>
>Is it normal for Water Miser caps (or Hydro Caps) to vent water out of the
>top? I've seen water pooling on top of my client's batteries, and we're both
>wondering if this is normal (my client thinks not, and believes the caps may
>have gone bad). You may be wondering what the bulk and float voltages are.
>My client's nominal 24-volt IGB's run around 29.2 and 26.4 volts
>respectively.
>
>I don't have experience with these caps, and only know that my own ancient
>T-105's (no caps) do frequently have water on the top. I wipe 'em off and
>fill 'em up now and then.
>
>Thanks,
>
>Gary


Gary,

Overflow not normal, and is very undesirable, with any type of cap. A 
slight amount of moisture accumulation is all that should occur.

It sounds like the batteries are getting overfilled. They should be 
filled only to the bottom of the filler neck that protrudes down from 
the top (that's typically about 3/4" down from the top).

The liquid expands as the battery charges, so if the battery is low 
in charge when it is filled, it can overflow later. If a low-charged 
battery needs water, keep the level low in anticipation of its rising.

Windy

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