Maybe find out if someone can build one for you??
DC/DC Converter, retail, wholesale, off-the-shelf and custom, 5 watts to 800 watts
Edit:
When I was looking at those 60W panels, the BZ -HV units seemed to be in my price range.
I think both the 250 & 500W MPPT -HV chargers chargers will handle 100 Vdc (I think).
MPPT Charge Controls