That's a nice module.
What's the output voltage range?
Have you measured the current?
How long does the battery last for?
"What's the output voltage range?"
the module itself can take 40V input and give 36 output ( didn't check it though as I don't have that voltage )
for my unit it gives an output of 0V to 16.6V at fully charged batteries.
"Have you measured the current?"
I did, it is accurate enough, my dummy load blew up so I can't test it extensively
"How long does the battery last for?"
what is your current consumption ? it all depends on your loads