backfeed to the load side, since in Lebanon most generators piggy back on the EDL Neutral (common), and most buildings don't have seperate earths, then only path for leakage is the Neutral side. keep us posted.
When the PV inverter is at full power, supplying a big load, or charging a big battery bank. Then, suddenly and at once, this load is switched off, or alternatively a PV input joins as a source with high VOC (which generally takes place early mornings & especially in cold weathers when VOC...
YES indeed, clipping is a common occurence, in those rare occasions of Super sunny days where your PV strings MIGHT max out for an hour (give or take), but you get the benefit of a wider bell-curve for the rest of the day resulting in a higher kWh energy yield throughout the year. IMHO, a tiny...
i would like to highlight a design handicap in the above that no one has raised in this thread so far. The above PV array is 11KWp, which can yield up to high 50's kWh (or more), while your battery is just a tad shy over 10kWh.
Unless you have heavy loads that might benefit from all that...
i was answering one question posted by a user confused as to why his SPF5000 was faulting with an OV only once during early hours, provided his system was rated with upwards of 450V for VOC, and he only had 12 panels outputting 36.5V @OC.... the whole thread ramified since then.
Long story...
I agree to almost all of what you've stated above, and you make excellent sense. However the original thread was opened with an AIO as the main inverter, specifically the SPF5000, which means:
1) the string is not connected to a standalone charge controller, but rather to an AIO inverter which...
1) it matters, because the SPF can operate without batteries (albeit i don't have it connected that way due to power outages in my area, but still). Therefore, whenever batteries cut-off, they must "Auto-recover" or "auto restart" the moment charging input is present (be it utility or PV's)...
can you share some details such as no of panels, strings, PV's VOC's, etc...?
On a side note, i probably forgot to mention, the installation i referred to previously runs 24/7 & is built with Tubular lead acids, so in a nutshell, a load is ALWAYS present as the lead acid constantly draws a...
I love how you attempt trolling your way into winning an argument that you seem to not have fully comprehended for the entire internet to give you a standing ovation.
I did not/ will never, get people to ignore published warnings of any brand of equipment, PERIOD! the discussion was way back...
True, however engineering systems design are aimed at addressing the worst "Possible" scenarios, not EVERY thinkable scenario on the planet, unless you're building a space shuttle where the unknown is pretty much anything.
For instance, i'm designing a system installation for a house, that...
you're right, my math was off by a decimal! sorry for that, i fixed it, final figure is Delta T of 69.6 (which translates to roughly -44.6 degrees after redacting the 25 STC).......
Still,
1) Do you get to -45 where you live?
2) Even if you did get to -45, you still haven't tackled the part...
Agreed, albeit "non-trivially" doesn't apply to this thread. The user "carpediem80" who initiated the thread lives in a place near my childhood house (happy coincidence) where temperatures never go below freezing, & very rarely near freezing. My answer was customized to his specific scenario. we...
thank you for the graph, pretty neat actually. Which inverter is that? and is that from webview or app?
may we know a bit about this system's components/ architecture? starting with the strings arrangement, passing through the main components, all the way to the battery. And while you're at it...
Incorrect...
you're answering to a totally different scenario called "VOC".....i.e. when panel is not connected To ANYTHING! just a voltmeter! then, you would take TC into consideration. This is typically during installation or repair, not NORMAL OPERATION.
i'm answering to when the PV is...
seems this is the method, in case all goes south! As you said, worth a try, albeit, try this time changing laptops (probably to a Win7 one, and a tad older)?
Wow, thanks for the details! would love to see a photo of that beast of a battery bank once you're done hooking it up.
Notice the following:
your VOC (uncorrected) = 398.4V
your VOC (corrected for lowest temp) = 415.13V
your Voltage in your graph =...
try pressing the up & down together for 5 secs, then set the number in the middle to 305, click Enter, you should see reset menu with 034, click enter to confirm, then esc to exit.
I'm glad to hear you've upgraded your capacity bank as of now. 15kWh is a great start, i guess you know over the course of a few months how it goes, and pick it up from there.
On a side note, may i know where is this installation located? i ask because i'm curious about the fog in the...
Noted.
i have almost 1 year data from my installation in Lebanon with 10 Trina Panels whose VOC is 49V (TOTAL OF 490v VOC) well beyond the 450V limitation of Growatt's SPF5000ES' VOC. I have not had a single instance of OV fault registered, EVER! & that installation is on a 900m high mountain...
what you highlighted (100A) is the max DC charger current OUTPUT, while what @carpediem80 was referring to is RAW MAX current output from PV strings, 2 very different things.
Of course he is, and in anticipation of such answers, i mentioned both corrected (-20C) & uncorrected (STC, i.e. 25C), to both of which my answer stands! (............Far, far from VOC!)