It is possible with just 8mA current consumption at 12V to have world class sound quality.
An example is the Pleiades 2N3053 - Philips AD5046N combination. Operation is in class A ie electrons flowing all the time. See relevant euroelectron post.
If it is made in a box a small solar panel could be on top. Extreme caution should be exercised in the choice or design of the battery charging circuit for safety. And of course a fuse should alway be in series with battery.
The amplifier can be ready anytime charged even under ambient light conditions. This is a bit unlikely though. As it sounds so nice it may be switched on for most part of a day.
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