I think you would be surprised how long they might last....30 minutes or 2 hours depending on what you are drawing off of them. You might do a test and plug in a lamp with a 60w bulb. Let the unit charge for 24 hours or more then unplug it. I might do the same as I think I have about 4-5 of these sitting in my garage. Like you said, might be good way to get some temp power to charge a radio or light in a storm. Let us know how it works for you.
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