I think we've determined that this particular SiteMonitor is defective.
One last test we did after my post was we had all the breakers off
(battery, load, panel), and when we connected battery to the SiteMonitor
PWR2, all the loads fired up. This is with the load breaker still turned
off. This tells me the load was getting back-fed through the PWR1
connector, effectively bypassing the load breaker.
Kind of a surprise.
bp
<part15sbs{at}gmail{dot}com>
On 5/10/2017 12:18 AM, Forrest Christian (List Account) wrote:
Which charge controller are you using?
On the base unit the following pins are tied together:
PWR1 -
PWR2 -
One side of the switch input.
The remaining pins are all reasonably isolated from each other, with
varying amounts and types of isolation.
For instance, PWR1+ and PWR2+ have no direct connection to each
other. Measurement-wise they are both very lightly tied to ground
through around 310K of resistance. The power to the rest of the
circuit is through two blocking diodes which should effectively
prevent cross-shorting as long as there isn't more than around 100V of
difference between the voltage inputs - which are rated at 60V, so
that should never occur.
The reason why I asked about the charge controller is that many now
have the following warning:
Inline image 1
The other question has to do with what voltage is the panel running at?
Barring that, maybe you have a defective unit. If you have an
ohmmeter, can you measure the resistance between Vin1+ and Vin2+?
On Tue, May 9, 2017 at 4:31 PM, Bill Prince <[email protected]
<mailto:[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
--
*Forrest Christian* /CEO//, PacketFlux Technologies, Inc./
Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602
[email protected] <mailto:[email protected]> |
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