question

Dear Jleroux, is not perhaps because the system gets too warm and needs to decrease the DC current to prevent overheating and shutting down completely?

@jleroux

Hey all; a short ess trouble shooting guide (I’m on my phone typing; this is all very sparse):

- start with checking firmware versions (needs to be latest). And when asking questions; report used firmware versions.

- check battery type/brand. If lead then answer/warn unsuitable and probably broken because of the heavy cycling.

- if some unknown unsupported canbus battery; then too bad; not supported; change battery. And believe me; there is a technical reason for not easily supporting all sorts of brands. Lots of work; as is troubleshooting such systems.

Then; if PV is not used enough to power loads;

- check for the # reason codes; see bottom of ccgx manual.

- check wiring: lots of voltage drop between mppt and multi will prevent the system from effectively powering ac loads from solar power

- test with and without SVS enabled.

- next, check mppt charge current limit during the time that it is not used enough. MPPT CCL is supposed to be high always; even when battery full. Unless there is a temperature issue.

- now check mppt Charge Voltage setpoint. Its supposed to be above actual battery voltage.

Note that those last two setpoints are determined by softeware; and calculated based on the setpoints sent by the (canbus connected) lithium battery: you cant change change them manually. Looking at them however does help understanding why certains things are happening;

Thats all I can think of right now; that you need to reset it is strange; you really think its some software reset that makes it work again? Or is it because the battery is discharged slightly while doing that; causing a change in CCL and Max Charge Voltage as sent by the battery.

Hi all, thanks for all the responses. I would like to apologize for not responding to this thread. I have no idea how I missed your responses.

I have disabled DVCC in the mean time and my system is running very stable and nice. But I would like to enable it again, and will do so in order to respond to your questions.

Some of the questions I can answer at the moment:

• I do not have a PV inverter connected to the output
• Firmware versions:
  • Quattro: 431
  • Venus: 2.23
  • MPPT: v1.37
• Batteries: 4x 2.4Kw Pylontech

When you change the mode, to what do you change it? One the Venus I go to ESS and change the Battery Mode from Optimized (With Battery Life) to Optimized (Without Battery Life) and then immediately back again.

I do no think the system gets to warm, reason is I have no issue when DVCC is disabled.

Thanks! Will give an update again as soon as I have enabled DVCC and the issue occurs again.

Hi all, another update on this, and getting really desperate

So DVCC is enabled

I check PV, and it is again not working

What I do to correct it is change the ESS Mode

That results in PV generating again:

Temperature:

PV Graph:

Anyone with a clever idea of what is wrong here?

Hi @jleroux

I notice ESS modes:

#1 SOC low

#2 BatteryLife is active.

Can you show what your bms is sending to the Venus? (parameters), this might be a clue.

Also: Why are you using BatteryLife?? that's for Lead Acid batteries.

Hi all, some feedback.

I think I got to the bottom of this. It looks like the problem occurs when you set the SOC to 95%. After changing my SOC to 90% I don't have the issue anymore, and the system performs as expected

@Boekel thanks for your question about why I'm getting ESS #1. That made me think!

Hi @jleroux

Is your PV shutdown issue still solved by changing the minimum SOC from 95 down to 90?

I'm asking because I've a very similar issue but at lower SOC limits. Very spontaneous issue like yours.

As I was not aware of your thread I've opened another one "feed in excess power not working in absorption phase".

Your answer is highly much appreciated!

Best regards,

Matthias