RobO

Not looking for guys to agree but connecting 16 cells as 4S4P you can use this cheap PSU to save time. Cannot charge the series bank over 13.8V=3.45V average but do it under supervision if some cells charge quicker. I prefer to 1st check all 16 cells to decide which are connected together. 
https://www.robofactory.co.za/power-adaptors/690-360w-12v-30a-power-supply-with-fan.html
Once at that level all an go in parallel for final charging with the previous mentioned adjustable PSU to 3.65V. This saves a lot of time and bucks. For the last 10% the 10A PSU should not take too long. 
This way you are already balancing the 4 parallel banks. 
You can also use a 24V 20A for 8S2P 

Hi. 
I use this one:
https://www.robotics.org.za/HPS3010D?search=power supply

Hi. 
I use this one:
https://www.robotics.org.za/HPS3010D?search=power supply

Because your inverter is hybrid capable of pushing power back into the grid it has to synchronise with the grid frequency and voltage  (similar to how eskom has to first synchronise a power plant to the grid frequency and voltage before it can connect that plant to the grid). Therefore, while the grid is present the frequency and voltage that the inverter will output will be the same as Eskom.
When the grid is not available it will output whatever you set it to.

From my experience I can confirm the following:
 
1. When Eskom is on, the voltage and frequency output on the essentials side of the inverter will equal that of Eskom.  Only during load shedding will the inverter give out that voltage that you set in the settings.
 
2. Yes it is normal for the lights to dip for an instant when certain loads kick in, especially during load shedding.  I see it when my fridge compressor kicks in, when my washing machine is running, and when my gardener uses the lawnmower during load shedding.
 
3. You shouldn't have a permanent earth-neutral bond, you should have a relay installed that only does the bond when the inverter goes off-grid.  I'm not knowledgeable enough to know what exactly the dangers are though...

Thanks to Steve at PowerForum who gave me the number of RV Solar. They replied within a day and came and sorted everything out for me.
For future reference - the floating neutral and lack of earth leakage was due to no earth-neutral bonding. The DB at the inverter was also wired completely wrong. I don't know enough about electrical to give all the details, but along with the lack of earth-neutral bonding, the circuit breakers and surge protectors in the DB were all wired incorrectly, some of them into each other in strange ways, and everything was just a mess and dangerous. Frankly, not even sure how it ran at all...
But RV Solar sorted me out quickly and easily - no problem.
For anyone looking for installers - particularly in the Durbanville area - I would recommend you stay away from MacroClear Solar. They are very quick to take your money and install something... but they don't have any form of after sales service, and frankly their install was unsafe and they never even gave me a CoC.
They are supposedly a Master installer with Sunsynk... but that shows you what that classification means... not much.

I've also found another approach that works.
Instead of defining settings as "sensors", they can instead be defined as numbers (and probably also switches for binary sensors). Using the same code above, the setting's value updates when you change its value in home assistant.
Here is the ESPHome yaml code for a number component. Once again I'm sure this can be neatened up.
number: # 219 Setting Low Battery %   - platform: modbus_controller     modbus_controller_id: sunsynk     name: "Low Batt Percent Setting"     id: sunsynk_setting_low_batt     register_type: holding     address: 219     lambda: "return  x * 1.0; "     write_lambda: |-       esphome::modbus_controller::ModbusController *controller = id(sunsynk);       std::vector<uint16_t> lowbatt_data = {uint16_t((x))};       esphome::modbus_controller::ModbusCommandItem set_lowbatt_command = esphome::modbus_controller::ModbusCommandItem::create_write_multiple_command(controller, 0x00DB, 0x0001, lowbatt_data);       controller->queue_command(set_lowbatt_command);       return x;

If you want to try this card in home assistant follow these steps.
1. Create a new directory under www/community/ and name it sunsynk-card. If you don't have HACS installed you can create directory directly under www and reference in step 3 below.
2. Copy the attached sunsynkcard.js into the directory
3. Add the resource to your Dashboard 

4. Add the Custom: Sunsynk Card to your Dashboard view. Select Show Code editor

5. Replace all the code with the contents from the card configuration file card configuration.txt

6. Scroll down to bindings and replace the sensors with your own
bindings: - bind: return hass.states["sensor.pv1_power"].state + ' W' selector: '#pv1_power_186' type: html - bind: return hass.states["sensor.pv2_power"].state + ' W' selector: '#pv2_power_187' type: html - bind: return hass.states["sensor.sunsynk_totalsolar"].state + ' W' selector: '#pvtotal_power' type: html - bind: return hass.states["sensor.battery_voltage"].state + ' V' selector: '#battery_voltage_183' type: html - bind: return hass.states["sensor.battery_soc"].state + ' %' selector: '#battery_soc_184' type: html - bind: return hass.states["sensor.battery_output_power"].state + ' W' selector: '#battery_out_190' type: html - bind: return hass.states["sensor.inverter_output_power"].state + ' W' selector: '#inverter_out_175' type: html - bind: return hass.states["sensor.inverter_output_current"].state + ' A' selector: '#inverter_out_164' type: html - bind: return hass.states["sensor.aux_output_power"].state + ' W' selector: '#aux_power_166' type: html - bind: return hass.states["sensor.sunsynk_essential_load"].state + ' W' selector: '#ess_power' type: html - bind: return hass.states["sensor.grid_inverter_voltage"].state + ' V' selector: '#inverter_grid_voltage_154' type: html - bind: return hass.states["sensor.load_frequency"].state + ' Hz' selector: '#inverter_load_freq_192' type: html - bind: return hass.states["sensor.grid_inverter_load"].state + ' W' selector: '#inverter_load_grid_167' type: html - bind: return hass.states["sensor.grid_external_power"].state + ' W' selector: '#grid_external_power_172' type: html - bind: >- return parseInt(hass.states["sensor.grid_external_power"].state) - parseInt(hass.states["sensor.grid_inverter_load"].state) + ' W' selector: '#non_ess_power' type: html Maybe someone smart can package this as a proper HACS frontend resource

Instead of posting my esphome configs here, I'm uploading them to github (partly just for keeping for my own backup)
 
Recently added all the setting values
 
https://github.com/jacauc/SunsynkEsphome

The issue ended up being the actual cable itself.
Guy from the installer company came out and tested and we found the actual cable itself was not working.
So I just gave him an existing ethernet cable and he chopped off the ends and he re-crimped and tested to make sure it works.
Just for anyone who reads this later, it's Pin 4 and 5 on the inverter side and Pin 7 and 8 on the battery side. (4 to 7 and 5 to 8 )
For whatever reason, a normal straight-through LAN cable didn't work. Even though the doc screenshots above seem to suggest that it should work.

Yes I heat up my geyser exclusively on the AUX output. I have setup the Aux as an output. When the battery is 100% SOC the AUX switches on and at 96% SOC it switches off.

Hi, if you choose a Sunsynk inverter there is a great way to save on your geyser power by utilising the AUX as an output. When the batteries are 100% SOC the AUX switches on and heats the geyser until 96% SOC (a selection). Of course one needs a RCD to protect anyone getting electrocuted at the geyser. If there is a cloudy day it is a simple ticking of the Aux under settings to force the Grid to heat the geyser. This is useful on both cloudy days and when one has a house full of guests using hot water. My electrical account for usage varies between R24.00 to R75.00. The R75.00 was during 4 days of massive rain and flooding in KZN with visitors in the house. (This is usage and has to include a basic charge of R294.00)
10 x 390W JA East West configuration
8KV Sunsynk Inverter
2x5.5KV Hubble batteries

Hi Guys. So sorry to jump in. We bringing in great cells into the country. They will be available in the new year right away . 
I hope this helps.
Sincerely
Jason

I bought 32 pc B-grade BYD 320AH cells from ROWEN in China, through Alibaba. They offer DDP price (includes transport, fees and customs). My set costed 2650USD all in. I received them three weeks ago well packed (8 boxes) and perfectly balanced (voltage and internal resistance). I installed them straight away in 16S (48V) with a JBD BMS and Xiaoxiang bluetooth monitoring app (admin version). They promised 260 to 270AH real capacity. It looks like they have at least 270AH. All cells seem to be in good health. I will keep you posted on further experiences. 
Hartelijke groeten uit Portugal.
 

Hi
My first project from laptop batteries, used or damaged.
Finally 45kWh 5040 cells
 
 
 
More Info:
https://photos.app.goo.gl/frBY7v1aT5d2QNFb9 

https://www.facebook.com/groups/pw.tech
 
https://6394943b4b212.site123.me
 
https://6394943b4b212.site123.me/moje-urządzenia-i-program-partnerski