My parents have a new off grid installation in Spain (no grid available where they live). The installation was installed August 8th 2020. I haven't physically been able to and check their installation (due to covid restrictions).
I am not at all a Victron specialist, but have installed my own Solar system, and I am very much into LiFePO4 batteries/ DIY powerwalls / off grid systems in general.
I believe their system isn't working as it should, based on my experience, and therefore I started to study the parts used in their installation in order to help them find the problem (because the installer treats my parents as retired old people and says everything is working as it should). But, wait...
* 39 solar panels:
- 12 280W panels connected to Victron MPPT150|60-TR Bluesolar charge controller
- 27 280W panels connected to a 5kW SMA sunny boy (sb5.0-1av-41 905). I don't know how the sunny boy is connected to the system. It's an "on grid" invertor according to SMA (= grid tie), therefore it would suffice to connect the SMA AC to the juntion box and it should regulate/synchronize it's output wave based on the Quattro AC (i suppose that the Quattro will act as the "grid").
* Quattro 48/10000/140-2x100
* 6 x 2.4kWh = 14,4kWh pylontech pack of batteries, good stuf
* Venus GX
The dashboard, at the moment, looks like this:
* Let's say that it's 1400hrs, the sun is shining bright, and the batteries are @ 60% and charging. Then, all of a sudden, the SMA stops putting electricity on the "grid". Often, the SMA sunny boy stops working for say 1 or 2 hours, losing critical energy in the winter and the end result is a battery that is say 80% charged instead of 100% at the end of the day.
So I checked out the statistics @ the moments that this type of scenario takes place (almost every day), check this out:
My father notices, for example December 13 (but this happens every day) that the Sunny Boy isn't putting power to the grid (He checks the Victron dashboard regularly, so he notices this quite soon), and he let's me know. So I start digging... And I notice this:
I notice that there are gaps in the production of the sunny boy.
I check the SMA error page, and at the moments that there are gaps in the production, I get frequency related errors:
So I go the the VRM-app, and dig into the frequency statistics:
To me it's clear that something is causing ripples in the AC frequency (from for example 11AM-> 1300hrs, 53Hz, which isn't just a ripple).
My parents state that their bulbs start flickering, change brightness when these peaks/gaps occur.
* Initialy the installer installed a 6KW SAJ invertor, but this invertor got so terribly hot, that after a week or 2 it died. The installer then replaced the SAJ with a 5kW Sunny Boy. I told him (through my parents, I didn't actually get to talk to the installer) to install a 6kW invertor, because my parents paid for a 6kW, and 27 panels in Spain cán in fact generate more that 5kW. But the installer said that that is non sense, a 5kW was just fine.
-> What the F*c#??
* The installer installed a 3-way switch for 'solar system', "off" and "generator".
When my dad connected the generator and sets the switch to generator, all lights inside the house started to shine brighter, a couple of LED-stripts/bulbs "exploded", and the quattro started clicking like a maniac (must be relays trying their best to regulate something).
i believe they miswired the generator connection to the system. I think that my dad is putting 220V onto the system (with the generator), but the quattro is the master, not a grid tie invertor. Therefore the quattro doesn't synchronise it's 220V with the generators. The result is, I believe, constructive and destructive interference and as a result the bulbs exploded due to the AC peaks.
Does this seem likely to be the cause/what's happening?
What my parents want:
* to have as much and as stable of a 220V system as possible
* to have the invertors charge the batteries as fast as possible, without devices stalling for no reason (because the loose precious daylight in the mean time)
* to be able to connect my parents 6KW generator to the system to power the house and charge batteries in dark weeks without a lot of solar power;
That's it, and that's what's promised by the installer.
Please give my your thoughts. I'm watching all that is to be watched on YouTube, reading datasheets, etc. but actual help/opinions of guys witch real Victron knowledge would be invaluable.
Thanks in advance.