6 hours ago, Coulomb said:

Edit: Duh. I now realise that warning code 07 (as opposed to fault code 07) can happen in bypass/line mode. In this case, it is telling you that it can't go back to battery even if settings allowed, because of the present load. So in bypass/line mode, warning code 07 isn't a big concern, and can be safely ignored.

 

 

Thank you @Coulomb for sharing your knowledge. I will ignore the warning ( when 07 flashes). I have setting for program 12 at 48 v and program 13 at 50v whilst program 29 is set at 46 v.   I hope these are ok. 

11 hours ago, Coulomb said:

Hello Coulomb
Need some help.
After reading your post below, it seems the closest situation I am facing.
Please be kind enough to assist with the following scenario:
I am using a PHOCOS 5KW-230V Inverter with 2 x US3000 Pylontechs and 14 x 410W Panels (2 strings of 7)
The PHOCOS software seems very similar to AXPERT, so the settings menus look almost identical and hence the below will be familiar to you.

I am having a problem with SBU Mode.
Menu 01 = SBU

Menu 02 = 70a (changeable, but pylon overrides this value according to circumstance....ive seen it at 10a, 20a or 70a)

Menu 05 = PYL (pylontech)
Menu 06 = Automatic Restart if AC output overload occurs - Enabled

Menu 07 = Automatic restart when over-temp occurs - Enabled
Menu 12 = 48Vdv (not changeable, as pylon overrides any changes)
Menu 13 = 52Vdc
Menu 28 = SGL

Menu 29 = 27Vdc (not changeable, as pylon overrides any changes)
 

Scenario:

Pv Input = 1.8Kw
Ac Output = 1.6Kw

The LCD will initially show PV & Battery Powering the load, which is correct as per SBU status.
Then randomly, it goes to GRID MODE.  Load.   On some occasions the MPPT points to Battery / or sometimes no PV arrows show at all.

Firstly, why does the status of powering the load change frequently from Off Grid Mode to Grid Mode, despite all conditions favouring Solar and Battery status.
And after it goes to Grid Mode....it stays on Grid mode either for 10 minutes at a time or sometimes  indefinitely.  Please explain the conditions of switching over to Grid Mode....and returning back to OffGrid.   Assuming battery voltage has never gone below the Menu 12 value of 48V.

My SOC is always above 70% and mostly remains on 80%.  Hence no chance of low voltage.
I am using a BMS Cable specifically for PHOCOS-PYLON, we know that they are communicating.

Following the above scenario, another anomaly:  the LCD screen shows
Utility powering the load only.
PV is available 1.8kw
Battery is available 53.1v
Yet neither sources are shown to be powering the load (despite being in SBU mode) 
Battery charging on LCD shows 0 Amps
Battery Status Indicator is flashing which suggests battery should be charging. So if it charging there should be some amps charging the battery and not zero.

Looking at the Phocoslink app simultaneously for the above scenario...it shows PV input, Ac input, and Battery being charged.

So all in all, the above situation is baffling and I'm failing to figure out what is causing this

Looking forward your feedback

Regards

 

 

 

No, that depends on the instantaneous strength of your battery (SOC, time of day, temperature), and your settings, especially setting 12 (back to grid voltage), and sometimes setting 29 (low DC cutoff voltage). I was trying to say that the danger zone is between 2 and 4ish kW (depending on load power factor) for a paralleled pair of inverters; it's not high enough to switch to utility (that's the problem; utility would save it), so the inverters stay with battery, the battery BMS will disconnect (may take some time, but it won't allow that sort of power continuously), and that's when the damage is likely to happen (if at all).

I had a quick re-read of the firmware, and it seems to me that (at least in version 73.00 which I have studied the most), fault code 07 never happens in bypass/line mode, so only battery mode. So it relates only to the inverter power and/or VA limits (I think both are checked). So I take back my "now I get it" comment. I note that warning code 07 happens at 110% or more overload for 500ms, and fault code 07 with:

• 110% power for 10.5 seconds, or
• 150% power for 5.5 seconds, or
• 200% power for 200 ms (0.2 seconds).

So I'm confused as to why switching to bypass doesn't solve your problem, saving the need to buy and extra inverter, and the battery and likely PV that needs to go with that.

Edit: Duh. I now realise that warning code 07 (as opposed to fault code 07) can happen in bypass/line mode. In this case, it is telling you that it can't go back to battery even if settings allowed, because of the present load. So in bypass/line mode, warning code 07 isn't a big concern, and can be safely ignored.

 

 

 

I believe that I've answered this on AEVA here.

On 2020/06/17 at 3:09 AM, Coulomb said:

<snip>

My version of the above table has a few crossings out:

 

Apologies for "high jacking" your thread Jason.

 

Coulomb, may I ask why you set the Float and Bulk charging voltages to 51.8V and 52.5V, rather than 53,2V as is often recommended?

 

Edited July 7, 20205 yr by [email protected]

3 hours ago, [email protected] said:

Coulomb, may I ask why you set the Float and Bulk charging voltages to 51.8V and 52.5V, rather than 53,2V as is often recommended?

It's a bit of reading, but you can find quite a bit of background info in this thread

5 hours ago, [email protected] said:

... why you set the Float and Bulk charging voltages to 51.8V and 52.5V, rather than 53,2V as is often recommended?

Thanks for the above link, Wolfandy. In brief: the higher voltages lead to faster degradation of the cells, and with overshoots may lead to the battery BMS disconnecting the battery as a last resort. The lower voltages that I recommend do result in lower usable battery runtime, but the amount is very small.

Thanks Wolfandy and Coulomb

Makes sense

I will go read the thread for the full details