Using Solar battery for DAC and Pre-amp

I bought a solar battery pack with inverter. 12V to 110V pure sine wave. The batter is Li battery which is very light and provide very constant  DC voltage.

Using Lithium might be convience, due to being light & portable and has a capability to last longer.   In my experiences using DC,  I feel AGM deep cycle type battery will give you a better choice in dynamic and transients.  

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.