RabidBunny

mmm ... Low and behold, can you believe ... ? So I've monitored my logs and it seems that I'm easily pushing between 7kW and 8kW now (in winter on a flat IRB roof)! Enough to carry the home load and charge the batteries, so Eskom has been permanently shutdown 2 days ago! Let me explain in brief: Originally the installers order decent panels (Grade A panels), however the installation was done with fong-kong ^&*%# panels (Grade C panels) as the suppliers sent the wrong panels - according to some knowledge people in the industry. I was invoiced for the Grade A panels, so I wrote a few threatening e-mails and all 28x panels were removed and replace with 28x 400W mono panels (Grade A) - less than the 420W fong-kong %$#%^ panels ... and what do you know my PV production increased by almost 90%

It has increased a little but not by much, went from 3.8kW to 4kW ... but today the load was very low and not normal - I can only compare again tomorrow when the load is pushed

I changed both charge/discharge to 100A If I change from Battery First to Load First then the same [3.8kW limit is reached], but with a twist at the end of the "solar-day" that my batteries are less than 70% charged

have tried, makes no difference - PV still not pushing beyond 3.8kW ...

That's also how I also understood it ... Battery first will push [as much as it can] to charge the batteries first - any excess is diverted to the load Load first will push [as much as it can] to load first - any excess is diverted to the batteries * because my 'Time of Use' is set to 100% battery target between 9am and 5pm, it will after the batteries are full divert any and all it can to the loads However in either configuration, the 11.76kW [theoretical PV limits], should push towards both battery and load [as I have that mother ugly Eksdom breaker turned off] ... 🙂

I paid a premium for this installation, which infuriates me as none of these options were explained to me. I assumed they would mount them correctly! I have more than enough space for additional panels, the issue is I am almost [capped] on the inputs for DC Inputs (based on panel ratings).

Results, according to having configured my setup / roof angle, etc...

"I knew beforehand going into my setup" ~ I was not explained this and I did not even think to ask as I assumed the installer would know these things beforehand - if pushing up the angle would resolve this issue, then surely the installer should know this and have correctly installed them?

Thanks, I will install the app and verify. Thanks for clearing that up as I understood the discharge to be at 230V, since the result of the discharge is pushed back into the "load".

That makes sense in terms of amps vs 48V system (to calculate the kW), however 60 amps is 60 amps (regardless of voltage) - again correct me if I'm wrong? The 10 degree tilt (not that far off from many other installations) is the roof itself running at this angle and I think may potentially affect the efficiency, but surely not as much as 60% ... that seems to be quite a lot?

BMS is communicating via CAN, batteries are communicating via parallel (their own internal protocol). My understanding is that the master battery (as per PIN configuration dictates where the charge is flowing). I have confirmed with battery manufacturer that 4x batteries in parallel should be set to 70A/80A (manual say BAH/*units in parallel* ~ inverters are capped at 115AH), master/slave, both connected to banks to share loads, i.e. Battery 1 = master, slave 1 ... slave 3 (master battery connected to master inverter, slave 3 battery connected to slave inverter) - therefor my understanding of 60A × 2 both inverters charging at the same time should produce 120A charge / discharge - (correct me of I am wrong)?

I confirmed with Battery manufacturer ... House wiring is max 63A so I can't push beyond that in any case (for the discharge). Charging is a little on the low side ... max 70A/80A recommend for 4x batteries in parallel (60A charges all 4 in around 2 hours) - extends battery life ...

Stats with 7x panels per string ...

Stats when we had 8x panels on PV 1 ...

Hi All, I'm new here and just had an installation completed and the system seems to be performing very poorly! 2x 5kW Deye Hybrid Inverters (Master/Slave) 28x 420W Mono Panels - 10.15Amp / 41.6V, connected in series 4x 5.1kW Lithium Battery Bank (Connected through CAN communications & Parallel). * PV Strings are wired with 6mm wiring at max 30 meter distance per string From the outset things had been very weird, since I had an installer sent out to do the installation and it seemed a little sketchy at first as I could never push my PV beyond 3.5kW when my load was between 5kW and 7kW. I've let the load continue for about an hour on many occasions the past week and a half since installation. I've raised these concerns with the solar shop, and they sent a second installer through to verify and re-wire where things may have gone wonky. The installer added 4x panels as I originally had 3x strings installed of 8x panels each (according to Deye - which was a 'No-No', as they suggested 7x max per string). They were then changed to 4x strings of 7x panels each - with the slave inverter now running 2x strings and not just 1x. I've contacted Deye, who performed a full system upgrade relating to getting both inverters updated with the latest Firmware and Software versions (however I can't seem to confirm this as I don't have access to the devices - having requested access twice now), and who verified the remainder of my configuration (need access to confirm). Now the issue I am stuck with is that no matter what I do I can't seem to push my PV beyond 3.8kW ... originally this used to be 3.5kW before having had the 4x panels added. My installation is done on a IRB roof facing 5 degrees from North (to East), at a 10 degree angle. I don't have any trees, or obstructions that would interfere with the panels generation capabilities. Technically, my system should be capable of generating at least 9kW during peak hours of the day (taking into account we are in the winter period and shaving off around 20% of efficiency), but it keeps on "capping" or limiting my input towards 3.8kW and drawing the remaining {X}kW from batteries! I just cannot get the panels to push beyond 3.8kW and when we test them with the multimeter they produce 294V (exceeding their capacity of 289.4V); however the max amp rating I managed to get is 4 amps during the past week and a half (only 1x cloudy day, but even then it "capped"). I'm therefor puzzled as to why their output in operating conditions perform so poorly? Any help and/or advice would greatly be appreciated, thanks!