MarcoPolo

@GTP  You can go more than the "Max PV array power = 6500w" although the inverter will not use the extra power. 
It is useful for overcast days to still make enough power to run your essentials. 
You CAN NOT go more than the 425V per string voltage or you will end up with smoke and fire!! Is a very good idea to stay well away from the limit. 
Amps can be controlled by the inverter by increasing internal resistance in the inverter, Volts cannot. 
Is also important to note that panels can sometime show higher voltages that specced when they are very cold. 
I would leave the 6 x 330W panels on one string (maybe add 2 extra's) and maybe have a look for some slightly larger panels that will get you close to 11A max current for max efficiency from your inverter. 
 
8 x 330W panels = 2640W
11A x 400V = 4400W - so quite a lot of space for some extra power if you can find the right panels.
Maybe speak to your supplier and find out what other options that they have. 
 

Hi Guys,
 
I've been reading up on many posts before and have studied the manuals from top-to-bottom ... but to-date I cannot find a "reasonable" answer as to the correct information I am seeking in terms of "PV Array / String Calculations" per MPPT Tracker [using multiple strings], etc.
 
I have the following setup:
 
2x Deye 8KW Hybrid Inverters ~ connected in parallel
24x 400W Mono Panels ~ strings are connected in series
 
Specifications for the Deye 8KW Hybrid Inverters:
Max. DC Input Power                     - 10400W
PV Input Voltage                            - 370V (100V~500V)
MPPT Range                                  - 125V ~ 425V
Start-up Voltage                            - 150V
PV Input Current                            - 22A + 22A
No. of MPPT Trackers                   - 2
No. of Strings Per MPPT Tracker - 2 + 2
 
Specifications for the 400W Mono Panels:
Maximum Power - Pmax (W)               - 400W
Positve Power Tolerance                     - 0 ~ +5W
Open Circuit Voltage - Voc (V)            - 49.76V
Short Circuit Current - Isc (A)              - 10.3A
Maximum Power Voltage - Vmpp (V)  - 41.19V
Maximum Power Current - Impp (A)    - 9.74A
 
Here is how I calculated the maximum PV Array Input Strings:
 
1. Deye 8KW Hybrid Inverter [PV Array Max - 10400W] / 400W Mono [PV Panel Max - 400W] = Max. 26 Panels ~ per Inverter
2. Max. 26 Panels / 2 (MPPT Trackers) = Max. 13 Panels [per MPPT]
3. [each MPPT Supports 2x Strings], therefore each string can theoretically be Max. 13 Panels [per MPPT] / 2 = 6.5 ~ Max. 6 Panels per String (rounded-down) [2x Strings per MPPT, 4x Strings per Inverter]
4. In order to balance the Strings - [i.e. 6x Panels per String] = Max. 12 Panels per MPPT ~ Max. 24 Panels per Inverter
 
Now let's verify the MPPT Range:
49.76V * 6 [volt increases in series connection] = 298.56V [theoretical V limit per String]
10.3A * 1 [amp does not increase in series connection] = 10.3A [theoretical A limit per String]
 
HERE is where I am stuck:
*each MPPT = 22A (max) or 500V (max) - if you will*
 
I *assume* that each string will be "combined" inside the internals of the Inverter itself, i.e. the Voltage will stay roughly the same [usually the lower of the two Strings], but the Amperage will double [since they will be connected in "Parallel"]?
 
Please can someone confirm for me whether the above logic is correct, are the Strings indeed "Paralleled" when each string is connected to A MPPT Tracker, or are they kept in "Series"?
 
The manual, online resources, searching countless hours, etc. ... nothing had produced any favorable results in terms of getting to the end-result of my *assumption*.