Planning on getting these panels: https://static.csisolar.com/wp-content/uploads/2022/09/06160941/CS-Datasheet-TOPBiHiKu6-TOPCon_CS6W-TB-AG_v1.8_EN.pdf

I will create two strings of 10 panels each, each on its own MPPT (no parallel).

Following are the output values with different bifacial gains: 

The voltages will be within range for both inverters, however, i'm unsure about the current

Infini 10KW datasheet mentions Max input current 2x 18.6A...so that should be ok?

Here's Deeye 12KW hybrid datasheet:

Can someone please confirm, both inverters will work fine with these inverters? (assuming bifacial gain of 20%)

Bearing in mind that

1. In both cases you would be over-panelling relative to the inverter's AC output, and

2. On the Deye you would be exceeding the 13A limit on the second MPPT, causing clipping of output.

Even if it may technically function and give you more power in lower light conditions, you will likely not see the full benefit of the bifacial gain of up to 690W on all panels at the peak of day.

3 hours ago, GreenFields said:

2. On the Deye you would be exceeding the 13A limit on the second MPPT, causing clipping of output.

Does 26A+13A mean that one MPPT supports 26A and other 13A? I thought 26A was in 2x configuration? At least, the clipping would be only on one string, and only under ideal circumstances when string is outputting STC amps (NOCT amps are 10.72amps).

While reviewing the Voltronic datasheet, I noticed there are two MPPT ranges:

In my case each string will have 10x 575w panels, Voc = 406V (NOCT). If I go by Full Load MPP range, then string will be on lower end, OTOH, its within MPP voltage range. So is this string config good?

Edited January 14, 20242 yr by LionKing

1 hour ago, LionKing said:

Does 26A+13A mean that one MPPT supports 26A and other 13A? I thought 26A was in 2x configuration?

Yes, the 1st MPPT supports up to 2 strings in parallel, while the second MPPT has an input for a single string.

1 hour ago, LionKing said:

In my case each string will have 10x 575w panels, Voc = 406V (NOCT).

No it's the Voc that's 49.2V, so at 492V the sytem should start up comfortably enough, and be clear of shutting down at 300V. The Vmp of 406V means you're only just in the window of where the inverter is operating normally at peak generation conditions. I won't say it won't work, but normally you want to be ideally closer to the nominal for most efficient operation which in this case is 720V. 

7 minutes ago, GreenFields said:

Yes, the 1st MPPT supports up to 2 strings in parallel, while the second MPPT has an input for a single string.

No it's the Voc that's 49.2V, so at 492V the sytem should start up comfortably enough, and be clear of shutting down at 300V. The Vmp of 406V means you're only just in the window of where the inverter is operating normally at peak generation conditions. I won't say it won't work, but normally you want to be ideally closer to the nominal for most efficient operation which in this case is 720V. 

I can just comment on my Solis grid tied 4g inverter. It has a operating range of 50-500V. Over nearly 5 yrs and starting with only 2x270W panels and adding 1 panel at a time I got the same output per panel from 2 to 6 X 270W under the same conditions. 

May be it is specific to this inverter or different on hybrids. 

Also I never got my 2x270W to stop producing even if the PV voltage was just above 50V on bad days. 

22 hours ago, GreenFields said:

No it's the Voc that's 49.2V, so at 492V the sytem should start up comfortably enough, and be clear of shutting down at 300V. The Vmp of 406V means you're only just in the window of where the inverter is operating normally at peak generation conditions. I won't say it won't work, but normally you want to be ideally closer to the nominal for most efficient operation which in this case is 720V. 

My conundrum is that I want to maximize solar output but I can only fit 20-22 panels on my roof. So if I split 20 panels into two strings of 10, then I end up with 492V - and face some clipping. If I go with two strings of 11 panels, then I get 541V which is much better efficiency wise but now I end up with even more clipping during peak hours.