question

4 x 60 cell panels (147V) in series is WAY TOO CLOSE to the strict 150V limit which will damage the charge controller. It can go over 150V in cold weather.

If you have 4 panels, you need to reconfigure them to be in 2 series and 2 parallel. Configure your panels using this MPPT sizing calculator to help with the correct configuration:

https://www.victronenergy.com/solar-charge-controllers

Have you verified nothing is shading any of the panels? In good sun you should definitely be seeing more than 218 watts from a 1200 watt array. That's only 18% of your capacity. Even at winter solstice with the panels completely flat on a horizontal roof you should be able to hit 60% of the arrays capacity in good sun. When my panels were new I was exceeding 100% of their rated power the first few months I had them on good clear days.

The fact that the voltage drops from 147 down to 99 from only 2.2 amps of current implies there's a significant voltage drop across a panel somewhere. What kind of panels are they? Do they have bypass diodes installed? Are you sure no part of any panel is shaded by anything on your roof?

You might want to test each panel individually. Most multimeters can handle up to 10 amps of current. This makes it very easy to test two aspects of each individual panel: Voc (Voltage Open Circuit) and Isc (Current Short Circuit). These numbers should be published by your panel manufacturer. It sounds like you have four 36 volt panels at 300 watts each? If so each panel should have a max current rating of around 8 amps or so.

Keep in mind you won't achieve 100% of the published numbers unless you're in an ideal configuration, such as perfectly clear sky, summer solstice at high solar noon and the perfect angle for your latitude. That said: Voc should come very close and Isc should be at least 60-70% of the published figure in good strong sun.

The bulk and absorb LEDs flashing is of some concern to me. It susggests either the factory calibration settings are lost (bad) or that the current sensor has an issue (also bad). Any of the aforementioned issues would cause erroneous readings.

I don't know of any way to troubleshoot the blinking LEDs on the MPPT. As far as I can tell, it's installed correctly and very simply. Panels to controller to shunt(-) to batteries. There is no documentation on troubleshooting the controller. Anybody have ideas?

After more and extensive troubleshooting, this is what I currently have come up with.

The MPPT 150/70 seems to be working correctly. The blinking Blue Bulk LED was the issue when it is in charging state and it appears there is NO reason for it to blink. As the manual says:

"Note (*1): The bulk LED will blink briefly every 3 seconds when the system is powered but there is insufficient power to start charging."

Here is what I found. When networked to the BMV 712, the MPPT will blink the bulk LED every three seconds when in bulk charge mode. All the numbers look correct, though and it should not blink.

When the BVM 712 is disconnected from the network, via the app, the blinking stops AFTER a reboot of the MPPT (kill all power to it, wait three minutes, power back up).

As for WHY? I have no clue. I did not make this stuff, but all the hookup is absolutely correct and the voltages and numbers are where they should be. No panel shorts, sun outages, shading, incorrect cable sizing, distances, poor connections, voodoo, sun eclipses, nuclear fallout, acts of God or anything else appears wrong.

Just a question, when you say networking - how have you connected the Mppt unit to the BMV unit that you mention.

the only way the mppt should have any connection to the BMV is via the Shunt and the neg and Pos Battery connections.

also could you screen shot the settings page under the battery selection

Also a few shots of the history page as well please

Here are the screen shots today in 32 degrees Latitude, full sun, southern exposure, no shading, panels mounted flat. 4 panels 2 + 2 parallel / series. Each panels is 300W, 37 VOC, 9A ISC. Tested each panels individually this morning with no load. Each panel performs as the specifications show. Tested them in series and and parallel configuration. Numbers are exactly right on to where they should be due to time of day and angle to sun. 74.3V and 7.68A Input to the charger with no load.

The error in the one pic of the history was me shutting it down via the breaker.

Hmm, all you can do now is more testing,

I see that you have the maximun charge current set at 56 amps, this should be 70 amps for this charger so change this setting to 70 and see how you go.

this would be why your peak watts is on 770 watts which is 59 amps depending on battery voltage at the time.

or

try 2 panels in series and see what you get then add another and another until you figure out why its so low in output.

check all connections for hot spots as well

56 amps is the battery manufacturers specification for maximum charge current. It never gets that high on the MPPT output, anyway. I checked all the connections and outputs building the panels in series and parallel and all the numbers check out to the specifications of the panel (VOC) and ISC (low for this time of year and the panels mounting flat to the horizon).

From looking at the demo library in the the Victron Connect App for the MPPT 150/70 unit it says it should be 70

I understand that you are saying the battery bank charge limit is 56A but just try the 70 for a short test and see what you get.

also your max PV in your picture says 770w so based on a voltage of 13.56 thats 56.78 amps which is what you have limited it to

so you will never get anything more that 770 W or there abouts.

So maybe change this to 70 and see what happens. as the charger is being limited to a max output of 56 amps at any voltage at this stage. ie 12V x 56 A would give you a max watts of 672

and even at 14V x 70a the max output of the controller is 980 watts

To get the Max out of your 1200w panels you would need a 100 amp Mppt regulator based on a min battery voltage of 12 volts. and the min on that day was 11.68

you could get a secound 150/70 and put the two Regs in Parallel (but this would then exceed your advised max battery charge current)or even adding a 100/50 unit as the secound reg and splitting the array out to two regulators 1 x 150/70 and one by 100/50 unit would work and thus give you the full array output (I suggest the 100/50 as these are cheaper and you already have the 150/70 unit. This would only apply if you increased your battery bank size.)

The above are just suggestions but change the 56A limit to 70A and see what you get. (change it back to 56 after the tests)

also when you do a change let the reg settle in and do the readings after say 2 or 3 min