krugerjq

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I use the one you posted and it definitely saves water. It is a good quality head also. Can be opened and cleaned. If you have good pressure the head feels good. 

Would need 4 strings of 5 which is not ideal, VOC would be an issue with 2x10. 3x8 would probably be better but would need 4 more panels, depending on the roof direction. 

Inverters would definitely need to be in parallel and on the same software version - else he will have weird issues
Ideally the batteries would link to a central busbar - quantity isn't as much an issue - it depends how much backup they need as a household.
Panels would need to be split across the inverters as well - possibly 10 per inverter based on roof direction etc

Hi,  I just installed a new Deye inverter 27th of Feb 2023. My info for firmware is the same however the MAIN: shows 3381-1515.  You sure it is 3382-1515

I think that's your most realistic option, and leaves some room for some extra panels to be added per string. Voc of those panels is just short of 50V, and Ioc is 14A. That inverter probably has a max PV amp of 13A and volt per series of 450V. Your other option would be to use one less panel and have one 9-panel string (if all facing the same way), which might be more efficient than 2 smaller strings that are both far off the MPPT sweet spot with their respective low string voltages. Perhaps others with first hand experience will chime in on these two options. However, if using only one string (assuming that works optimally for your roof), you may be limiting yourself for further expansion on the unused string, or would need to re-cable later. 

Agree with @Kalahari Cruiser Rather put 1 string with 8 or 9 panels. Do the exact math to make sure you stay under the 450V limit of the MPPT

A few considerations (while roof direction, sun, shading etc) all play an important role. But in terms of the basic specs (including some double-counting here):
1. check inverter max PV input (6600W?)
2. check MPPT voltage limit (absolute max I think is 500V on yours)
3. check the MPPT input spec and range: (think yours is 370V (100V-500V).
4. voltage sweet spot is (I think) 370V, give or take. Absolute max is 500V, but your string sizing working max would leave some room for spikes, i.e. 450V, i.e. do not add 10 panels in series with a VoC of around 50V. 
5. divide your panel's open circuit volt spec into this number (i.e. 450/49.5 = 9 panels). that's max string size. 
6. actual power and current will be less, but the above is for planning / sizing purposes. 
7. look at the minimum voltage required (seems like 100V). That means your realistic minimum size string is 3+ if you split your array
8. so yes, 2 strings of 5 panels will work, each string Voc spec will be around 250V each (but actual considerably lower), but the question then is: you're far off the MPPT sweet spot of 370V, will you be getting more out of your two strings than if you rather go for a single 9-string setup. But as mentioned earlier, while you can oversize the total array (but I don't know by how much, on your inverter), you "may" be better off starting off with 9 panels on one string, and then if and when you expand, to perhaps go for 2 strings of 6-7 panels each. Of course, if the intention is to perhaps add another panel or two per string soon, then you may as well start off with the 2x 5S setup that you proposed.  Array output oversizing may give you better returns on marginal days, but how much you can oversize the total array by, others will be in a better position to say. 

Deye supplies a straight Ethernet cable with the inverter, for parallel communication when inverters are setup in parallel : not the custom cable you need ...
Looks like another cowboy "installer" who can't read manuals.
Anyway, without the proper cable (easy to do if you have an RJ45 crimp tool & spare connectors on hand ...), You need to leave the inverter manage the batteries with percentage or voltage. Percentage being very approximate untill you fully discharge & fully charge the batteries for the inverter to figure out a more precise %. Easier to use voltage to avoid inverter reporting 40% when the battery is actually closer to 80% or the other way around ...

Looking at your battery manual, you may be able to use a straight cable after configuring the dip switches for CAN-L and CAN-H on your battery ...
Sw1 : 1 & 2 up (enables CAN)
Sw4 (CAN-L) : 5 up (wire # 5 on the Deye side)
sw5 (CAN-H) : 4 up (wire #4 on the Deye side)
Should work

Yes. The cable provided with the inverter (should be yellow ...) should be straight.

Hi @krugerjq welcome, that system components you have in mind are pretty solid, good luck with going forward and keep us posted. 

Hi everybody
My name is Jacques and I am from Witbank. Have been reading a lot on this forum and decided to join. I am also interested to start with a solar system at my house. Looking at a Sunsynk 5Kva, Greenrich battery and some panels.