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People say here that it is completely OK to have panels/string max power current quit a bit greater than mppts max current. They say Mppt will only take what it can handle. I.e. mppt will limit current from the panels on this situation and everything will be fine. Correct? Similar situation...

Thanks very much Z. For voltage reduction I found this paper: https://www.researchgate.net It seems to show that cell voltage drops from 0.64V to 0.58v at 45C. 0.58/0.64=0.906 So I guess for my panels with Vmax power=29.7V I should expect 29.7*0.906=26.9V per panel 4 panels should give me 107.6V...

Thanks everybody for constructive input. I totally agree that bviously installing 4 additional panels costs more than replacing inverter to have lower working and starting voltage. Calculations show that at any angle of the sun here in Glasgow (and any time of day as well) the 2 vertical panels...

Yes. That's what I did if u look in the table Sun 10 degrees : limited by 4 roof panels 2 bottom panels produce the same as 1 roof panel; Total the same as 5 roof panels at 10 degrees. Sun 33 degrees: Current Limited by roof panels. The bottom 2 panels produce the same as 1 roof panel. Total...

Thanks Hedges. I absolutley agree that simply replacing inverter for one with working voltage below say 100V (for my 120V 4 panels) and using 2 MPPTs is cheapest and most productive thing to do. It will give me max possible power from both sides etc. But just out of interest i did some calcs...

What i have is simply 8 panels inseries to 1 mppt. Problem is 4 of them are on S roof and other 4 are on E roof. Hope this helps

Sorry - i am not clear again: 1)I already have system working as 8 panels in series connected to 1 mptt at 240 V BUT 4 on E and 4 on South roof. I am stuck with inverter and 8 panels already there. 2) I suggest 2 possible improvements (which would require 2 or 4 extra panels) to my badly...

Thanks Hedges. 1)Did i get it right that mixing a vertical panel (facing straight south) in 5-in-series string with 4 panels in the roof facing straight south) is a 'small difference' and should work just fine? 2)Do you think that connected 2 verical wall panels in parallel and THEN...

Yes one string of 8 in series connected to 1 mptt. MPTTs voltage range is 120-450V. Starting voltage is also 120V. Thats my problem. I can't have 4 panels producing 30v each (29.7 at full sun) with my mptt. But i do not have space for 5th panel on the roof :-( And panels already installed and...

sorry - i meant to have 1 string which would consist in 4 panels in series which will be connected in series with with (2 vertical panels in parallel). So the total voltage for my panels producing arounfd 30 V will be around 150 V. Te idea is that 2 vertical pannels connected in parallels will...

Installer connected 4 S + 4 E in series to make one string of 8 on 1 MPPT. Second MPPT is not used ATM. Thats pretty bad i know

And another thought - would it be better if i have 2 vertical panels on South wall in parallel connected to 4 on South roof in series? This might help with degradation when sun is high and vertical panels are about 30-40 degrees to sun direction (as opposed to ideal angle of 90 degress)? Might...

I think i do not have enough panels (4 panels with max working voltage of 29.7V) on my south facing roof for my invertor. Invertor is Growatt SPH3600TL BL-UP - and invertors working voltage is 120V-450V. So ATM my installer connected 4 panles from straight East roof with 4 panels from straight...

The growatt SPH3600TL BL-UP invertor has minimum volatage of 120V and start Voltage range from 120 V I have 4 DMEGC DM410M10-54HBB Full Black Solar PV Panel 410W panels which have following working voltages (right 2 columns) - max power voltage 29.72V (NOCT - 800 w/m2). Question: would these...