MPPT 100/30 producing 0 watts 0 amps

Question

question

kking asked Jun 18, '21

MPPT 100/30 producing 0 watts 0 amps

Hello,

I set up my solar system a week ago and have not been able to receive any watts or amps from the system.

Setup:

2, 100 W panels wired in series

100/30 MPPT charge controller, wired to + and - bus bar

2, 200 AH AGM batteries - 1 year old

Victron battery monitor

The battery voltage will drop below 11V and the panels still do not produce any power. I have disconnected the wires and reconnected, checked all the connections, and checked the fuses on each end of the system. Here are some pictures of the current readings.

It also will read the battery voltage at 13.8V on the Smart Solar, but on the battery monitor it reads 10.8V.

battery charging MPPT SmartSolar mppt charging

29b445ed-9824-4aea-bf10-ab154d83688e.png (202.9 KiB)

2577e442-3be8-4319-9231-e85f755cbfd2.png (183.9 KiB)

92badc5f-47b3-46c9-b87a-41454dcf2f8c.png (202.6 KiB)

e5542bfe-518e-4353-a971-78f1929b10b1.png (221.0 KiB)

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Modifications Space

Node Red Space

Answer 1 · 2021-06-18T15:46:37Z

Matthias Lange - DE answered · Jun 18, 2021 at 03:46 PM

There are many other questions about this topic, please use the search function.

In most cases it's a bad/loose connection, open switch or a blown fuse somewhere between the MPPT and the battery.

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Answer 2 · 2021-06-18T16:15:35Z

wkirby answered · Jun 18, 2021 at 04:15 PM

It's almost certain that the battery is not connected to the MPPT for one of many reasons. This evidenced by your statement that the MPPT will show 13.8V (which is it's programmed target Voltage for Float) and the BMV is showing 10.8V. At night the BMV and MPPT most likely show the same battery Voltage.
You can see the difference in readings which would not be possible if both the MPPT and BMV were properly connected to the battery.

Connections may look OK but a high resistance terminal or connection can be decieving.
Check fuses, check that circuit breakers are actually operating and making a connection when closed. Check terminations are sound.

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

question