Posted January 9, 20232 yr Hi All, Currently I have 12x 410W panels installed. 6x panels in series connected to the first input on MPPT1 and 6x panels in series connected to MPPT2 first input. Thus has room for a second string for MPPT1 input 2 and MPPT2 input 2. I am looking at another set of 12x455W panels, 6 in series and then connected to input 2 at MPPT1 and MPPT2. My question, will the fact that the VOC and ISc differ between the 410W and 455W cause any issues when connecting a 410W panel sized string to MPPT1 input 1 and a 455W panel sized string connected to MPPT1 input 2 and same for MPPT2? Any one done this before? Edited January 9, 20232 yr by schalkvstaden
January 9, 20232 yr 27 minutes ago, schalkvstaden said: Any one done this before? If the 6S2P 410W panels are withing specs for the MPPT1 then run those together and, run the 6S2P 455W panels on MPPT2 if their Voltage and combined current are within specs. Running 6S 410W together with 6S 455W, where the Voltages differ is generally not a great idea, you will get less out of the combined parallel string than the individual strings are capable of.
January 9, 20232 yr 36 minutes ago, schalkvstaden said: Hi All, Currently I have 12x 410W panels installed. 6x panels in series connected to the first input on MPPT1 and 6x panels in series connected to MPPT2 first input. Thus has room for a second string for MPPT1 input 2 and MPPT2 input 2. I am looking at another set of 12x455W panels, 6 in series and then connected to input 2 at MPPT1 and MPPT2. My question, will the fact that the VOC and ISc differ between the 410W and 455W cause any issues when connecting a 410W panel sized string to MPPT1 input 1 and a 455W panel sized string connected to MPPT1 input 2 and same for MPPT2? Any one done this before? Just move the 6x410w on MPPT2 input to the 2nd input on MPPT1. This gives the same as 6S2P. Then add the 6S x 455W on input 1 on MPPT2 and the other 6 x 455W to the 2nd input of MPPT2.
January 9, 20232 yr Author sound like a plan. will check the solar panel values and if within range will connect as per the recommendation. thanks alot
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