Classic powers up, but dead short at input

[MadScientist267]

Haven't gotten that far yet, but wanted to note that I took a peek just for curiosity... It's been floating at least since today's reset @ midnight... at present, it's got Vin at ~19.2V, and has the Voc registered as 16.2V. Found that rather peculiar.

I'll also do a run here shortly to see what it says at various points. Just wanted to make a note of that for posterity.

[boB]

Haven't gotten that far yet, but wanted to note that I took a peek just for curiosity... It's been floating at least since today's reset @ midnight... at present, it's got Vin at ~19.2V, and has the Voc registered as 16.2V. Found that rather peculiar.

I'll also do a run here shortly to see what it says at various points. Just wanted to make a note of that for posterity.

Do you log certain registers ?

You can also check  modbus address   4121  which is another form of Voc.  (Register 4122)

There is also modbus address  4223  (register 4224)   which is Voc before actually coming out of resting.

And   address  4230  (register 4231)  which I think is what is displayed on the MNGP.

[boB]

Steve, try this....   Tap/push (lightly-ish) on the top of the PCB while watching the PV input voltage.
Use an insulated somethingOrOther like a pencil eraser.  You don't have to have it running or
even have an input source...  It should provide around 2/3 of battery voltage reading all by itself
with the input disconnected.  See if the input voltage changes/rises/lowers.
The components here would especially be the input voltage divider resistors (part of it anyway)
to the left of the microprocessor (100 pin IC),  R20, R21.

R86 and R24 are also in the circuit but they are series and not shunt to negative so would cause an
opposite effect of there is a bad solder joint.

Thanks,
boB

[MadScientist267]

My apologies for the slow response...

It held 7.2-7.3V the entire time

From the sounds of other communications, I guess that's that then eh? I'll jump in the email loop shortly.

Thanks for all the assistance.

Steve

[boB]

My apologies for the slow response...

It held 7.2-7.3V the entire time

From the sounds of other communications, I guess that's that then eh? I'll jump in the email loop shortly.

Thanks for all the assistance.

Steve

7  to  8 volts is about what it should measure on the input terminals when there is no input connected except for the 12 volt battery