Couple weeks back I posted about the wacky beeping/lights flashing charging issues I (and others) occasionally have with the M1A.
I am aware of the "reset" instructions and have made sure my charger is working (red light on when plugged in).
This weekend I stumbled upon either a coincidence or the actual trigger to the problem.
Usually I leave the charger plugged into a wall outlet and attach the Solo when I want to recharge after every use. If I keep recharging in this order, all is fine.
Occasionally, I move things around or am going portable, and when I set up to recharge I plug the Solo into the charger first and THEN put the plug in the outlet.
Almost exclusively, my unit only seems to go out of whack when I plug into a wall outlet as the FINAL step.
And when I need to get the Solo to "reset" by holding down both buttons, it only goes back to "normal" when I plug into a wall outlet as the FINAL step.
To keep it running OK, I can then go back to the "plug into wall outlet FIRST" method (until I forget and have to reset all over again).
I am not an electronics whiz. Is this possible? Can the order you power up the charger be a factor?
Comments?
Holy crap dude I think you just helped me figure out something that's been having me pull my hair out the whole time I've been working on my new battery packs for the Solo.
This IS totally possible, in fact it's not only totally possible but now that I think about it; it actually makes sense that it happens when you plug in the devices this way.
I discovered a while back that the Solo has a very particular and sensitive protection system that is completely external to the usual power protections that are supposed to exist on electronics like battery protection cells and power supply protections. This is good because it means nothing is going to break in it if you plug in the wrong charger type or if your charger blows up it shouldn't (shouldn't - dosen't mean it won't) take it out. I've also noticed you can totally destroy the protection circuit by accidentally connecting reversed voltage; but whatever, that was my fault.
Anyways, what I'm getting at here is that the Solo independently checks the voltage of the current coming into it to make sure it wants to subject the rest of the unit to that power. Now, the chargers that we have a set voltage and current that they are supposed to output, but they take a couple of microseconds to actually ramp up to a point where it can supply the rated voltage persistently.
Since your plugging in the charger, with a load already connected to it, that load is going to pull power from the charger regardless of whether it ramped up all the way or not. And when the solo polls that voltage, it isn't what it is expecting and drops the line, and flashes at you (I assume it's three yellow lights right? That seems to be the undervolt debug indicator)