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SRNE Odd MPPT Charging Behavior - Pause Every 12 Minutes?

The Victron MPPT SCC seem to operate the same way.

So, clearly on a beautiful cloudless sunny day these sweep do nothing.

On the other hand, during a day with a very change weather with sun and clouds we could gain in power.

But it's possible to make more efficient algorithm.

A parameter that might be useful would be to enter the max Vmp voltage of the string to prevent the MPPT from searching so high to find nothing.

Change MPPT Tracking Refresh Interval - Victron Community

community.victronenergy.com community.victronenergy.com
 
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During a mixed day with little sun, the power losses are less visible on the "PV Power" curve and I would even say that the sweep is beneficial if we look at what is happening at 13:54:10 when a sweep begins.

1676581118159.png

1676581061479.png

1676581176985.png
 
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Aerial Gopher said:
The array was 610 ( 2x310 ) and now is 1500 watt with more panels, it has been doing this before as well as now.
The max PV input is 1600 watt, and max Voc is 100vdc which the panels and set up is below both those limits.

So I have had a small array, and one that near maxes out the charge controller.

On a 170 watt load on the inverter, the total draw from batteries is between 80 - 90 watts more to run the inverter. Was not happy about that.
Im in talks with the seller on Aliexpress, and they claim all of this is normal, but we have all been down that road before.
Click to expand...
Could you help on how you wired your panels...a string of 2 panels in series and parallel?
 
Some people don't like seeing this MPP tracking every 30 minutes.

Below is what a Deye Hybrid does not do.

Same string, just a different inverter.

EAsun 27.05.2023 :

11_PV_MPPT_Power_Curve_27.05.2023.png

11_PV_MPPT_with_shadow_27.05.2023.png

Deye 06.09.2023 - Very nice curve but...

MPPT Power Curve.png

Production loss !

MPPT shadow Production loss.png

Deye test of 08.09.2023 :

MPPT shadow Power.png

MPPT shadow Voltage.png
 
Sleeper85 said:
Production loss !

MPPT shadow Production loss.png
Click to expand...

Each one of those chart grid squares is equivalent to ~ 42 Wh. I estimate approximately nine squares worth between your estimated pink missing production line and the actual yellow production line, which is 0.375 kWh.
 
mirekcafa said:
SRNE (SMXII 5,6KW) the problem is software V6.17. With software V6.35 the curve is already fine
Click to expand...

Interesting, so how does he react in the presence of shadow?

Actually it's not a problem, it's just that it searches for a better MPP every 30 minutes.

If with 6.35 he no longer does it then perhaps he is no longer looking for a better point or is he doing it differently?
 
Hello, I can add some information here as I actually designed some additional software for my inverter to do this sweep periodically, thread here
The primary purpose is of course to jog the mppt off of false maximum power points when the shading diodes are in action, for my array typically at the beginning and end of the day. Your are right some production is lost although I don't know why there sweeps are so long, mine are done in about 30 seconds! The upside is the mppt isn't locked onto a fake peak for sometimes up to an hour.
I have never found the need to further tune my installation as IMOP for me it's about right as it is (PRF ~10-12 mins) but for a commercial product I would certainly expect it to be tunable. Hope the thread is helpful :)
 
mirekcafa said:
Yes it works like that, but even when the weather is nice it takes 25% grid and the rest solar.
When the appliance (water heater) is switched off, it releases energy to the grid for a few seconds.
Click to expand...
Thanks for information!
The same thing with model SMX-II-3.6Kw !
I don't know how it does it, but it actually mixes power from mains and PV (with software 6.67, without battery).
On the other hand, there is not any actual "bypass", mains power goes through the inverter, even if PV not active.
 
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