Here are my measurements:
Nanostation Loco M2
24V 170mA peak, 130mA
12V 320mA peak, 230-240mA
9V 430mA peak, 310-320mA
5V 790mA, 550-560mA
4.5V no
if you are looking for great off the shelf mppt solar charger check
out this one:
https://www.ebay.com/sch/i.html?_odkw=mppt+charge+controller&_sop=15&am…
You can configure it to use Pb or Lithium batteries, it is really great.
If you are looking for a more advanced DIY solution check out this
awesome open hardware MPPT solar charger:
https://soldernerd.com/mppt-solar-charger/
Cheers,
Valent