Hi everyone.
I am new to Midnite and jsut finished my installation with the following:
2 strings of 4 Solarword 240w PVs with the following specs:
Voc: 37.2
Vmpp 30.2
Isc 8.44
Impp 7.96
So a total of 1,920w / 148.8v
Going into a combiner box with 15amp breaker for each string.
Charging a 5 strings in 24v of RA12-105 batteries with the following specs:
105ah
12v
Connected in parallel to a common busbar using 1/0 wire with 24" in length.
For a total of 525ah at 24v
(I know that more than 2 strings in parallel are not recommended, but I had no other option and took as many precautions as possible)
My problem is that I am seeing 14v of input on the MNGP even with the PVs breaker off and at night time. To confirm this reading, I measured the voltage using a voltmeter at the PV+ and PV- on the classic and they were showing the same.
If I turn off the Battery output breaker, the Classic 150 obviously turns off and the voltmeter show 0v when reading directly.
What could be causing volts from Battery crossing to the PVs and showing as input voltage?
I am attaching the readings as of 11/23/2017 9:30pm with PV breaker off.
Same issue when I first started using the Local App
http://midniteftp.com/forum/index.php?topic=3865.msg37620#msg37620
you will see that idiosyncrasy as long as you own the Classic.
there is a reason it holding onto ~ 1/2 of the last incoming voltage but I don't remember it right now.
hth
normal to see that voltage at night or with no PV
Larry
that "stray" voltage from the batteries lights up the SPD on my pv array at night
Quote from: Matrix on November 23, 2017, 09:06:17 PM
Same issue when I first started using the Local App
http://midniteftp.com/forum/index.php?topic=3865.msg37620#msg37620
Thanks Matrix and all the other.
I was kind of worried that some current was crossing back to the PVs. Have a good and sunny day!!!
Normal
No Worries
VT