Found this in the manual.
Q; How many Amps do I get out of my 125W Solar Mat and what can I run?
A: A 125W kit can supply between 5 and 6 Amps in optimal conditions on a sunny day or for most of the sunlight hours
of the day. There are many variables, but let’s assume that we can achieve 6 to 7 sunlight hours in a day, anymore
sunlight hours would be considered a bonus.
Provided it is not too cloudy, the solar mat is moved every now and again to best track the sun’s path and the solar
mat is kept out of the shade, it is safe to assume that the solar mat can supply between 5 and 6 Amps per
charging hour.
So my 5.7a might not be that bad given the time of year. They also state their figures on 125w at 17.6v and 6.82a. Only 14v coming out of the panel into the regulator.
Even so, thinking of getting another to use separately or paralleled.