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 Solar battery for DAC and Pre-amp
I did a minor science project yeasterday. I used Solar panel to charge my solar pure sine wave inverter battery at day time. Then I used the battery to power my Oppo 205 anb Sennheiser earphone amp. The result is super. A day sun shine will charge 100% of battery. Then I have 5 hr of of energy to power my audio equipments. The 12V to 110V pure sine wave inverter battery gives much clean power source (no noise for power grid) and it's 100% carbon free clean energy. I urge audiophile to explorer this option of new energy source: clean and pure.