Just out of curiosity, have you tires the 30Q in a 4S2P configuration?
No I have not tested it. But I do believe that it works well for a chill photography flying style. Power consumption in hover with 4S3P with gimbal and camera was about 290w (max 22A). 4S2P being about 190g (or 10%, with AUW 1900g) lighter, power consumption in hover is also at least 10% less and should be about 260w (max 20A @ 13V).
Nice job! Yes, it works with Li-Ion (2.5 - 4.2V) cells because they have the same upper voltage limit as LiPos (3 - 4.2V). But since LiPos have a higher minimum voltage, the Solo BMS will tell you to RTH / land the drone based on cell voltage, when actually with LiIon cells you still have a little more flight time left. But anyway this little more
flight time is not so important and it does stress the battery less if you don't fully discharge it every time.
RTL can be triggered in three ways with the Solo BMS:
- Pack voltage (if the voltage is less than 14V for more than 10s)
- individual low cell voltage (I don't remember this value, but it must be at around 3.5V per cell)
- used capacity in mAh (if used capacity is more than 4900mAh, or less, depending on the health of the battery)
I would recommend to test a LiIon battery in hover 1m above ground and observe how to drone behaves when the battery is low. Keep in mind that the metal case of the LiIon cells dpoes influence the compass of the drone thus you need to disable the internal compass (with 4S3P I had to do that, maybe with 4S2P you don't, I don't know)