| I knew electronics where finicky but this is ridiculous...
My small on-grid PV system includes a BZ MPPT500 charge controller and a Xantrex Prosine 2.0 inverter/charger. Recently the BZ malfunctioned, it passed the PV current through but failed to do the voltage-conversion trick (50V panels, 12V batteries). I sent it to BZ and they returned it, fixed, hopefully. So I re-installed it this evening, hoping for sunshine tommorrow to check it out. To make room in the batteries for a charge, I turned on the inverter. Other than a soft glow of the backlight in the remote display, it shows nothing, no LEDs light up, and it does not respond to any of the switches. Last time I used it, a couple of weeks ago (AFTER the BZ failed) it worked fine, both as inverter and as charger. Now the only sign of life, other than the glow, is: if I plug it into grid power, after several seconds I hear the transfer relay clicking. So perhaps the main unit is OK, and only the display is not? Tried replacing the communications cable (it's a standard 4-wire telephone cable), same thing. What to do now? I bought the Prosine used, so I don't expect a warranty?
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