>> I don't worry about the computer battery but then I never worried about
>> catching the flu from a pig.... I don't think I want the batteries in the
>> kitchen (I don't have a basement).
There are more expensive batteries that are sealed, thus do not need vented for gassing. But the cost is very expensive, about 3x golf cart batteries. We can do a battery closet, well vented and done if you have a spare closet that could be used.
>> Is it ok to have them outside where the temp swings from maybe 10F in
>> the winter to 90f in the summer. And I worry about moisture in the
>> cabinet as the inverter will put out heat inside when
>> it might be cold outside.
Man, it's really not good. Maybe if we were in the south it would be a better option. We would basically make a cabinet that was moisture sealed and well insulated. We would need to add some temperature controls to fan and a heating element. I can have small fan relays that work by thermostat, a heating element that does same. Just enough to take the edge off the extremes.
Although this isn't ideal, it is a very worthwhile path to blaze. If we can succeed at creating an outdoor system, it's going to benefit allot of folks.
Here's a post about the project:
Outdoor Battery Cabinet Project