I have a Newpowa 24V/210W panel I think should be perfect fit for the AC50s.
Vpm 33.54V
Imp 6.24A
Voc 39.66V
Isc 6.55A
It will be mounted flat so on van roof never get perfect conditions.
Am I correct about the match?
I did a quick test in heavy overcast and got just 8 Watts charging. Not unexpected.
Hopefully tomorrow I can test in sunlight.