A Bitaxe Gamma typically operates in the neighborhood of 18–22 watts, depending on configuration and tuning.
At that power level, inverter and PSU overhead becomes significant.
In our testing and typical SolarAxe use cases, powering a small miner through an AC inverter and then through its AC-to-DC power supply can add approximately 10–12 watts of conversion overhead.
Think about what that means.
If your miner needs approximately 20W to hash, an additional 10–12W of conversion overhead is equal to roughly 50–60% of the miner's own operating load.
Instead of drawing around 20W from your available energy, the complete AC power chain may need roughly 30W or more to accomplish the same job.
When you're plugged into the electrical grid, that difference may seem small.
When you're mining from a 100W solar panel, 10 watts is valuable.
That is power that could have been running your miner, charging your battery, extending your evening runtime, or keeping you online through passing clouds.