The Outback Power FM80 solar charge controller is a high performance MPPT controller which converts a solar array’s output (up to 150VDC, 64 amps) down to charge a 12, 24, 36, 48, or 60 volt DC battery string using a high efficiency switching buck converter and an extremely flexible microprocessor control system. It is field programmable from the front panel and can be linked to other system components using Outback’s communication buss and the MATE controllers for system logging and remote control.
It is extremely well built, and solid as a rock.
More photos below…
First off, here’s the back of the display board, and the large thick fin extending off the front cover which serves as a heatsink for the power switching transistors. Note that the entire metal casting which serves as the front of the unit is a big solid heatsink. The small cable running upwards goes to the plug for the user-replaceable cooling fan, which is inside a small removable enclosure at the top (not pictured here).
The entire board, showing the transistors; these are held to the heatsink/top cover with a copper heat spreader strip that secures with… well, a lot of screws. The thermal design is excellent. The inductors appear to be wound with many parallel strands of nylon coated copper wire.
The board viewed from above. Note the size of the inductors! The small vertically mounted board contains the microprocessor and control logic.
The big heatsink fin. The gray pad is a compliant (squishy) phase-change (melty) thermal gasket.
MPPT charge controllers aren’t cheap, but with this one, you seriously get your money’s worth. I highly recommend the Outback controllers!