My battery is completely dead at 10.5 volts. Anything lower than that will damage the battery. I just emailed the company who made my solar charge controller to make sure they support AGM batteries. I'll find out soon if I'm destroying yet another battery (this is my 3rd). AGM is typical for solar applications so I hope it supports it.
I tested it outside of the car on the first day I owned it. Laid it on my driveway on a reasonable day. Produced ~1.2 amps. I've honestly never measured it again. I think part of the problem may be that we're dumping the power into agm batteries. That kinetic battery I see in your trunk is AGM, right? I believe I read somewhere that solar charge controllers kill them if not designed for AGM, and I can attest to the fact that my Optima blue top's life is SIGNIFICANTLY reduced - like my stuff only lasts a few hours on it before the battery reads 6 volts, but that may be because of several significant unnoticed discharges. Might want to ping OldSpark on this one since he seems to be the most knowledgeable about battery tech on this forum.