Sunsynk (DEYE) Hybrid Inverters

I purchased 2 X 8kW Deye inverters and mounted them in my Garage. They can get noisy on full charge or when supplying 5kW+ to the house, but no issue with them in the garage. They are setup in parallel and share both the load and charge (both are connected to the battery common busbar). In theory, I can charge at 280A from grid.
As my meter box is also on my external garage wall I ended up installing a new primary CU in my garage and an industrial changeover.
I have a large DIY battery.
To echo @SD_DRACULA I would recommend putting everything in the garage, you will need the room.

Thing is also I will probably have to get an NC7 if I am expanding..my wife works as a manager in ESB Networks and I have to be above board on this😕….. That saying if I do go down the NC7 route it has its advantages in that I can upgrade my MEC and maximise FIT payments. I have a 16kVA connection and the transformer for my house is just for my house its not shared.

Did some research today about the 16kW Deye inverter and it might be harder to get approval for that then maybe two standard enough 8 kWs.

Things are going to get expensive…need to write a business case at this stage..

I have one which is per hour and dumps if above a particular % each hour, dropping by 15% each hour.

So 9 - 10 will only discharge down to 60%, 45% by 11, 30% by 12, and 15% by 1am, leaving 15% for the last hour.

So if the % is below a level for that hour, it won't discharge.

So it stops over discharging throughout the evening, especially now that I have a heatpump

I've been doing this, but I noticed last night that if the home load exceeds the discharge rate on the battery, it's pulled from the grid. When I enable export, I'm setting the export limit to 2kw. Is there a better way, or should I just let it export a greater amount?

I guess I was initially trying to figure out what minimum SoC I needed to get from midnight to 2 am and was exporting at a lower powe but have a good idea now, thanks for the advice!

Very clever - is done on the inverter or through HA?

Another option is solar assistant: https://solar-assistant.io/

I'm running it on a raspberry pi zero. I like that it's separate to home assistant as I'm always messing with home assistant and I don't want the risk of messing up the inverter config/schedule.

I send the data from solar assistant to home assistant through mqtt.

The schedules are easy to build in home assistant.

Has anyone successfully connected the output of a Solis (or other) inverter to the generator port of a Deye inverter without any issues exporting all the power to the grid? The manual doesn't provide clarity on this.

Their website has very good instructions for installing on the raspberry pi(or purchase an orange pi with solar assistant already installed), connecting the lead to the inverter and configuring the software:

https://solar-assistant.io/help/getting-started/prepare-device

Once it's all connected the charts will already be working. And then you can setup the automations.

Something to manage this would be ideal for me too. I'm limited to my original inverters export 4kw but can produce 6-7kw now. I have different automations plus an eddi crudely managing anything over 4kw on export basically, if I'm exporting more than 4kw for > 30 secs, the eddi must be full, so I enable battery charging and divert up to 2kw there but that can leave similar to your pic above with just 2kw going to the grid and 2.5kw to the battery .

The Deye can run completely off the grid, you need to do the sums to determine if you will have sufficient panels and solar to charge during the winter months. The Deye can take a generator input too so that may work as a plan B if needed. If you're willing there's plenty of info on how to DIY a battery and kits available locally that are as good as the off the shelf batteries and for substantially less without the wait and hassle of importing direct from China.

You would want a seriously large solar array to power a car in winter offgrid, much bigger then a 8.5kw invertor can handle. Makes more sense with some other input, like Hydro or wind. And in the end, there is zero chance it's not significantly cheaper to hook up to the grid and use the overnight EV rates.

I already have large array and battery for house, this carport is just for 9months of year so as house is fully self sufficient and export to grid, taking cars off house supply greatly helps things ,