I upgraded the battery to a single 12 V 10ah sealed battery a few months ago. I just had this unit down at our off-grid cabin in New Mexico last week. I ran my laptop a few hours each day and would top off the laptop’s battery by plugging into this. We also used this to power our “stereo” system which consists of a pair of 12Volt Bose Computer speakers and an Ipod, on one of the days we were there we ran the “stereo” for over 8 hours…first some music while I was putting in the rest of the cabin LED’s Ceiling lights, and then later we listened to an audio book for about 4 hours…The entire time the voltage never dropped below 12 volts on the battery…..In other words the charge was maintained at 95% or better for the 4 days we were there.
We will be taking this on our up-coming road trip to the Grand Canyon and Zion National parks…Zion has a “no generator” policy. We camp in tent sites without hook ups…so this unit will be great for letting us upload pics from the digital cameras and keep up with our blogs and journaling. All in the perfect peace and quiet that solar provides. The other unit that I have for sale and posted about here has 24 ah of storage, (nearly 2.5 times the storage of my laptop unit) it has two 6 volt 12 ah batteries wired in series, that unit also has a 300 watt inverter as part of the “package”, it is also set up in a simpler configuration with dual 12V sockets, and is single switched (on/off). For our up coming road trip we can use the 300 watt inverter I keep in my truck for any minor AC loads.