[image: Inline image 1] On Wed, May 10, 2017 at 8:41 AM, <[email protected]> wrote:
> blasphemy > > -----Original Message----- From: Sorin Esanu > Sent: Tuesday, May 9, 2017 9:49 PM > To: [email protected] > Subject: Re: [AFMUG] SiteMonitor II: Independence of PWR1 & PWR2 > > > We’ve experienced this exact same behaviour last week. It seems like PWR1 > and PWR2 are acting like one now. > We are in process of replacing all the SiteMonitor II devices with Tycon > TPDIN-Monitor-WEB2, which can monitor more things and it’s a lot smarter. > > > On 10 May 2017, at 01:31, Bill Prince <[email protected]> wrote: >> >> 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. >> >> >> -- >> -- >> bp >> part15sbs{at}gmail{dot}com >> > >
