LJ93

Hi @Multiwatt

I hope you don't mind me asking, but what do you plan on powering with this system?

HV is mainly there for the commercial/Industrial/agricultural sector and most of these businesses tend to power huge water pumps,CNC machines, injection moulding etc, which would lend themselves more to LF inverters given the system is specced correctly.The HF inverters like Sunsynk for example would generally struggle with these inductive loads (especially if several of these need to be stopped and started one after the other) as you won't get the same flywheel effect one would get from the transformer based (LF) inverters like Victron (some installers like using several of the 15kva Quattros) and the likes of Atess, where they predominantly focus their product around the commercial sector.

I agree with @Steve87 ,in that R&D is mostly based on feedback.And if your feedback comes mostly from residential installations where your product makes more sense, then that is where you most likely going to make the largest progress in terms of rolling out new features or even a new product.Without gradually going up in the weight class and taking on the commercial sector starting off on a fresh piece of blank paper, then Sunsynk would be like a lightweight boxer getting into a ring with Mike Tyson in the heavy weight division...one would be asking for a knockout lol.

Hi @Multiwatt
Firstly what kWh level are you trying to reach? Secondly what Voltage are you trying to reach ? There are other battery options & other inverter options that make your requirement possible...ATESS & FreedomWon.
Sunsynk will not answer your question neither will Herholdts. Sunsynk are not the OEM so they a middle man, Herholdts are also a middle man. Trying to communicate with 2 middle men is difficult. Deye are the OEM communicate directly with them, they know the product well, as they produced it. 
Unfortunately, these guys want to play in the HV market with commercial power. But Commercial power needs proven concept & engineering, you simply cannot do this on a fly & you need good amount of R & D before you roll out. Unfortunately, from what I have seen these guys are still thinking in the residential market. They think they can release a product that they can solve with firmware once it's out in the wild. 
A very good way to burn your fingers in the Commercial market!!

Must say this is exactly the sort of conversation I thought we would have. My team that works with me is broad & diverse. From a youngster that does a lot of roof planning & PV installing all the way up to a semi retired railway signalling engineer. 
We are better than the sum of our moving parts but alone we are but mere individuals. We all support each other & we are all open to ideas on how to accomplish a task. Because we have learnt it's about perspective. You have a different angle of view so hence can have a good suggestion. We carried out that installation of 100kW Inverter system with 96 solar PV modules on a 3 storey roof with a team of 6 including myself & accomplished commissioning according to spec in 11 working days. 
 

So here is the PV Db as of today, better?

There are 2 factors that is going to influence the Voc(Stc) and Isc(Stc) that is on the data sheet, temperature and solar radiation. When designing solar arrays the temprature characteristics bottom right should also be considered. The Voc at 0°C will not be 494v for the 10 panel string but rather 494 x (25x 0.26%)=526v then the 500v Isolator should rather be 600v dc rating or even better 1000vdc. Isc at 0°C would then be 14.12A Fuse rating should be Isc x 1.56 and then select closest standard dc fuse size. 2nd factor is if irradiance would exceed 1000wm² that could happen due to cloud edge. Use max series fuse rating on data sheet if in doubt. The installation site will determine temp factors.

What's so funny about this thread is that, yes you need a Wireman & yes you need someone to certify & test AC circuits. Given the fact that Solar tech is so new & has boomed, there are so many guys that took it on as electricians & what's also funny is that electricians know AC circuits pretty well. However, & a big however, Solar Systems contain so much more than AC circuits etc. 
They contain a large portion of DC circuits on the roof in the form of PV as well as batteries & HV batteries for Commercial sites. The PV arrays can get up to 850V and so can the batteries in DC. So we start playing with potentially life hazardous DC power to which a lot of electricians are not equipped nor experienced with. Let's not paint everyone with the same brush, a lot of them have also good DC experience. 
It doesn't stop there. Commissioning is another subject. Good to connect it all up but it will require some system knowledge & that usually borders on IT with CANbus & RS485 as well as working & crimping RJ45 cables with pin outs. Then you have the collective idea of someone who possesses the skills of mechanical knowledge of what works on roofs & safety on roofs. 
Let's just say I think it requires a lot of disciplines mixed into one person & that person is not really ideally an electrician as a must. 
I hope this gives confidence to a lot of ppl but I also hope it keeps ppl honest enough that if you don't know something or you are not sure there is no embarrassment to ask or seek answers. The best of us & the worst of us don't all know the same things.