fopoku2k2
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- Joined
- Aug 20, 2020
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What does the spec mean by PV Array MPPT Voltage Range = 120Vdc~430Vdc
View attachment 72707
ooh ok. thats good to know. I have 4 panels of one brand (38.86Voc) and 8 panels of a different brand (42.15Voc). Can I still do 6S2P?View attachment 72713
I just noticed something... The new v4.0 manual upped the max Amp input to 22A!
Software change? I dunno, but if that's the case, then a 6S2P configuration should work perfectly for you with your setup.
ooh ok. thats good to know. I have 4 panels of one brand (38.86Voc) and 8 panels of a different brand (42.15Voc). Can I still do 6S2P?
ooh ok. thats good to know. I have 4 panels of one brand (38.86Voc) and 8 panels of a different brand (42.15Voc). Can I still do 6S2P?
I can not connect all 12 panels in parallels. If I do so I would go over the voltage limit. Find below the spec sheet for the panel. It is a 375w panel. I think I can only connect 10 of the panels in parallel.
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yes I am running a battery system. No they are all connected to the growatt from the combiner box.Whoh.... You didn't say anything about different panels.
Personally I would do 8s with the higher wattage panels.
What are the full specs of the other 4 panels? You running a battery system I would suspect? Separate MPPT for those 4?
Thanks for your additional advice. Since I do not have any additional CC I would stick with the 8S configuration. Seems to be giving me all the power I need to fully charge the batteries each day.Your best bet is to do 8s into the Growatt, and 4s into a separate charge controller for charging your batteries.
From my understanding, if you combine the different panels, you are going to be essentially turning your 375w panels into 350w panels, but I am by no means up to speed on the implications of mixing panels. Normally, you never mix panels. They are pretty close, but at any given moment will be producing different voltages and amperages. Might want to do some research here on that subject.
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Edit... Came across this link in another thread here.
DIY Solar - Wiring Different Solar Panels w/ Same Watts | altE Solar Blog
altE's Solar Queen demonstrates what happens when you wire up mismatched solar panels - same watts, with different volts & amps.www.altestore.com
Based on that video, I'd say if you want to wire them all into the Growatt, I'd do 4 375w panels, + 2 350w Panels on each string and do your 6S2P configuration, *IF* you can confirm the Growatt will take 22A input. Otherwise, you can do 10S with 8+2.
8 panels, Vmp = 34.41v, Imp = 10.90A
- What is the Vmp, Imp of the 8 panels?
- What is the Vmp, Imp of the 4 panels?
I have been using the Growatt SPF 5000 ES since September of this month. I recently noticed that solar generation goes off for an hr to 3 hrs each day. When this happens the inverter is able to read voltage from the panels but no current. I have 12 panels connected to the inverter in 3 strings of 4 panels each.
Total voltage of my PV setup ranges from 120vDC to 150vDC. Total current also ranges from 10amps - 35amps. I just went over the manual again and noticed that it is written on page 39 that the Max. PV input current is 18amps. Am I over heating the inverter with my 35amp panel configuration?
Thanks for reading and your contribution
@sunshine_eggo got a question for you. can I do a capacity test with this inverter?
Get an external shunt.I meant how do I read the results of the capacity test on the inverter. the readings on the inverter are quite confusing
I suspect that’s an either or option. Like 320V at 18AI dunno.... They say you can put 6000w of PV into it, but also say 450v max and 18a max, which is 8100w,
so it seems there is some ability to overpanel a bit if you can work out the panels to hit close to those max values.
In this case, a 12S config should be around 450v, 11.5A based on what we know. I'm sure the open circuit voltage is going to be way too high once we see the actual panel specs.
Yeah, contacted Growatt and they confirmed that it will not use more than 6000w - it's a hard limit.I suspect that’s an either or option. Like 320V at 18A
Or I 450v at 13Amps.