Himal

@Nexuss it's 545w panels, didn't think it would produce more then 4360w. @PowerUser no specific reason, they initially wired two strings of 4 panels and then had to subsequently make it one string.

@Nexuss you were spot on, no watt limit per mppt. System works great with all the panels on one mppt. Thanks for the advise. The installer and Sunsynk had a chat and agreed to try the 8 panels on one string for me.

Spoke to Sunsynk - they advised each MPPT will only pull 3300w max

thanks guys for the above - just wanted to confirm that if you put 8 x 540w panels on one MPPT = 4320w, then the inverter will only pull 3300w (6600w/2 - 5kw Sunsynk inverter) from that string? Everyone notes voltage is an issue but no one speaks of watt limit per MPPT

cool - but i will only use the other MPPT if i need more solar capacity in the future and if so i can just add 5 panels to the second string to realize the efficiency. is the efficiency benefit significant when use two MPPT instead of one?

thanks @YellowTapemeasure - the table i shared above are as per the calculations from the link you provided. For 8 panels the max VOC is 435v at -10 degrees and 275v at 40 degrees. I'm definitely within the MPPT voltage range. Learnt alot over the past week. @iiznh agreed - i'm going with 8 panels on one string to maximum the efficiency and i got a string available for future upgrades (hopefully not needed). Guess got to wait 4 weeks now for the installer.

cool thanks @Nexuss. My panels will be facing north - so i could probably do 8 x 540 panels = 4320w (within the MPPT voltage range) instead of 2 strings of 4 panels and i will do 2180w on the second MPPT in the future to reach the 6500w. Please let me know if you guys have any other aspects i need to consider - its been a great help!

thanks @PowerUser - the calculations in my table are as per your formulas in the thread you shared above.

@Scorp007 - thanks for the explanation, understood. @I84RiS - thanks - voltage is the main concern for the MPPT - i have created the table below which shows the VOC in different conditions (STC,NOC, -10 degrees Celsius) and 40 degrees Celsius) for a 8 panel string. Based on the results it seems the VOC will be within the MPPT range of 125v- 480v per the Sunsnynk data sheet. Does this look reasonable to you? Further is the single string of 4320w a issue? As i'm assume MPPT1+MPPT2=6500W max, the 6500w doesn't not have to be split proportional (i.e. 3250w per string). Also out of interest someone told the inverter can handle more then 6500w of panels, is that true? if so how much more can you add above 6500w? 8 panels on one string will be great as i will have a MPPT slot to use in the future, where i can pick different panels.

thanks Nexuss - that's on a 5kva inverter? to be honest i just dont want to damage the inverter, which leads to downtime if they need to fix it up.

Thanks guys - @iiznh - to confirm you running 12 540w on a 5kw Sunsynk inverter? sorry dumb question what you mean by "clip the excess current"? wont damage the inverter. @Buyeyedoes the inverter not have a 3250w max rating per mppt (thats what i was told by Sunsynk)? 8 panels will take it 4320w but the volts will only be between 320-400 , which is within the MPPT range of 120v-425v

Hi Guys, Please can you assist me - i'm looking to get a 5kv Sunsynk inverter, a 5.5kw Hubble battery and solar panels. My monthly usage 400-500 kw units. For the solar panels i have contacted two installers and each recommended different solar panels. The one installer recommended 8 x 455 solar panels (one single string) and other recommended 8 x 540w solar panels (2 strings of 4 each). The 540w panels do produce more power and will hopefully not need to buy more panels in the future, but i have concerns that this might not be the optimal panels for the invertor. However with the 455w, i will have an extra string to full up in the future. Also if a add another 5.5kw battery in the future - would i need to get additional panels depending on the panel i choose? Not sure which solution would be the best optimal solution? would really appreciate your views and recommendations. thanks