These can combine in a lot of ways. For example, I can play mandolin with my hands, drums with my feet (kick / hi-hat), and then use the breath controller to play something jawharp like controlling pitch with head tilt.
Let's go through some of the pieces:
Even though seven of these are possible, the only ones you generally run into in traditional music are major (I), minor (VI), mixolydian (V), and dorian (II).
Another way to think of these is as adding flats:
But what if we added a second bag, under the player's other arm, which powered the drones? Now the player can intentionally modulate the pressure on the drone bag to make the drones vary rhythmically:
Alternatively, instead of chaining the bags you could pipe the player's air into both of them directly, allowing them to vary the pressure on the chanter as well. My impression is that this is less useful, because when pipers play with just their chanter I've always seen them keep a steady pressure instead of using variation in pressure to add expression. Or maybe bagpipe culture is just anti-expression, and the instrument is actually quite capable? Or am I paying too much attention to British Isles piping and other traditions do involve varying bag pressure for rhythmic accentuation?
Other people I've talked to with similar experiences:
He's operated under many business names:
To tell how full an AGM battery is, you let it rest for at least four hours and then measure the voltage. This isn't all that accurate, but it should be enough to keep from drawing the battery down too far. You can also measure the voltage under load, but this is even less reliable.
I tested with a box fan on "high", which drew about 70W (75W counting the inverter), and recorded the voltage every so often: