Good for you junzhang10! Nothing better than battery power for a low-current device!
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I think there was someone on here that uses a batter power supply and solar to power their whole system. if memory serves He used a goal zero Yeti and clamed it was very good. and powered his system for many hours.
it intrigues me as i have bad power in my building and the thought of being off grid for my system is an intriguing thought.
just want to add a few notes to this topic. Using solar to charge and using battery to power your systems is a wonderful idea. My only concerns here is how are you going to regulate that power so that you can use it. Dc is great but dc do fluctuate at a certain voltage. Your regulator has to provide constant voltage and amperage. Just my opinion.
Batteries give an exceptionally flat DC power supply....,..But getting it to a usable voltage for your equipment (AC or DC) is the tricky part. Most transformers / inverters rely on some kind of switching circuit that messes up the "pure" current you started with.
Just because an inverter says pure sine wave doesn’t mean that it is and a true "audiophile" grade inverter (if they even make then) will be extremely expensive. Which model are you using? Did you research what the sine waves really like like on an oscilloscope?
PS. I know there are many things people claim to hear that can not be measured by state of the art equipment. But power coming in is not one of them. The DC voltage is either perfectly flat or its not. And AC is a perfect sine wave with the proper voltage or its not. You can see this to the microvolt with the proper scope.