Bests & Worsts Reviews from Amazon

I set up this charge controller to work on two solar panels of 37.5V open circuit voltage and max current of 10A, hence why I selected 75V / 15A. First weekend of use, I connected via bluetooth to the unit and found out the state was OFF and the panel was shorted directly to the battery, providing full 10A overcharging the battery to 16.6V. Batteries are permanently damaged, luckily the electronics connected to the batteries did not fail. Problem is in the design and marketing of this thing. This is a simple step down buck converter, it has two power switches and it steps down from panel voltage to battery voltage. Problem is that Victron designers used IRFB3607 mosfets (power switches) rated for 75V maximum! Electrical engineers de-rate this voltage by a certain percent (e.g. 20%) to operate away from breakdown voltage. Not Victron... the datasheet specifies that maximum voltage is 75V and I connected 75V, driving the switches to the limit of failure. And failed they did, and the failure was catastrophic, it shorted the panels directly to the battery (no protection there either) overcharging and damaging the batteries. They should have specified a lower PV maximum voltage (62.5V or so) or designed the components inside with some safety margin (100V switches). Probably OK if you keep this in mind. Another thing to keep in mind is that if this fails, the outcome will likely be the same: panel shorted to the batteries with no protection whatsoever to your batteries or loads.