I think I have a SiteMonitor II with a problem, as I always thought that
the two power sensors (PWR1 and PWR2) were independent of each other, and
should have a pretty high impedance between then.
We set up a new solar site, and put our load on PWR1 and the batteries on
PWR2. As soon as we hook up either one of the sense wires, the breaker to
the batteries (30 amp) pops, and all the lights go out.
We can monitor one voltage on PWR1, or the same or different voltage on
PWR2. However, if both are connected we blow the 30 amp breaker to the
batteries.
We've checked the polarity (both voltages are negative ground), and they
are both "about" the same voltage (although we have monitored radically
different voltage in the past (like 12V on one and 48V on the other). This
is a 48VDC system, so we are seeing ~~ 56V on both right now,
BTW, when we hook up just one of the sensors and leave the other open, we
see ~~ 43 volts between PWR1 and PWR2. I haven't checked other
SiteMonitors, but this doesn't seem right to me.
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bp
part15sbs{at}gmail{dot}com
