# Photo Voltaic System

## Electrical Diagram

- The home is connected to the inverter's backup output.
  In case of inverter failure, the home can be powered directly from the grid by switching the "Photovoltaic - Grid selector".
- The heat pump is powered directly from the grid.
  The heat accumulated by the house is sufficient to survive day-length power outages.

```
      Main switch                        Photovoltaic - Grid selector
GRID o----/  ----+-----------------------------------o
                 |                                     
                 | Inverter switch    +----------+      o------o HOME 
                 +-------/  ----------| Inverter |---o /
                 |                    +----------+ 
                 |
                 | Heatpump switch    +----------+
                 +-------/  ----------| Heatpump |
                                      +----------+
```

## Turn off

1. Inverter on/off
2. AC Circuit Breaker
3. Battery Storage
4. DC Isolator

## Turn on

1. AC Circuit Breaker
2. Battery Storage
3. DC Isolator
4. Inverter on/off

## Inverter

- Model: *Solis S6-EH3P12K02-NV-YD-L*
- Version: *060008-080005* (14.08.2025)

### Battery related configuration

- *Force Charge 5%* – Regardless of everything else, once the battery reaches this level,
  it will be charged from the grid up to the level specified by *Recovery 25%*.
- *Over Discharge 10%* – At this level, the inverter stops drawing energy from the battery
  and also cuts off the backup output in the event of a grid failure.
- *Batt Reserve 20-100%* – At this level, the inverter stops drawing energy from the battery, unless there is a grid failure,
  in which case it will supply the backup output until *Over Discharge* is reached.
- *Max Charge SOC 100%* – I allow the battery to be charged to full capacity.
- *Allow Grid Charge ON* – The battery can be charged from the grid if needed.
  the inverter will still charge it from the grid.
- *Battery Saving ON* – When the SOC is below Batt Reserve, the inverter draws energy from the grid for its own needs,
  without using up my reserve.

### Storage modes

- `BIT00` - Self-Use mode switch - Storage Mode "Self use"
- `BIT01` - Time of Use switch - TODO
- `BIT02` - Off-Grid mode switch - Storage Mode "Off-Grid"
- `BIT03` - Battery wake-up switch - TODO
- `BIT04` - Back-up mode switch - Battery Reserve Switch "ON/OFF"
- `BIT05` - Allow charging from the grid - Allow Grid Charge "ON/OFF"
- `BIT06` - Feed-In priority mode switch - Storage Mode "Selling first"
- `BIT07` - Night battery over-discharge hold - TODO
- `BIT08` - Dynamic regulation enable when force-charging - TODO
- `BIT09` - Battery current correction enable - TODO
- `BIT10` - Battery treatment mode - TODO
- `BIT11` - Peak-shaving mode switch - Grid Peak Shaving "ON/OFF"
- `BIT12` - Reserve
- `BIT13` - Reserve
- `BIT14` - Reserve
- `BIT15` - Reserve  

> Either Self Use or Feed In Priority mode must be turned ON, turning one on will automatically turn the other off.
> Backup mode can be turned on independently of Self Use and Feed In Priority as this mode determines how the system
> will behave when the grid goes down.
> Off Grid mode should only be turned on if the system is installed with no grid connection at all.

Examples for "Self-Use" mode:

- 1 (decimal), 0000 0000 0000 001 (binary) - grid charge OFF
- 17 (decimal), 0000 0000 0001 0001 (binary) - grid charge OFF, back-up mode ON
- 49 (decimal), 0000 0000 0011 0001 (binary) - grid charge ON, back-up mode ON,

Examples for "Feed-In" mode:

- 64 (decimal), 0000 0000 0100 0000 (binary) - grid-charge OFF
- 80 (decimal), 0000 0000 0101 0000 (binary) - grid-charge OFF, back-up mode ON
- 112 (decimal), 0000 0000 0111 0000 (binary) - grid-charge ON, back-up mode ON

Documentation:

- [Energy Storage Operating Modes](https://usservice.solisinverters.com/support/solutions/articles/73000560490-energy-storage-operating-modes)
- [Self-Use mode](https://usservice.solisinverters.com/support/solutions/articles/73000558744-11-of-20-energy-storage-operating-modes-self-use)
- [Feed-In mode](https://usservice.solisinverters.com/support/solutions/articles/73000558755-12-of-20-energy-storage-operating-modes-feed-in-priority)

### Time of Use

Self-Use Mode:

- "discharge slot" - battery -> grid
- "charge slot" - doesn't matter if charging from grid isn't allowed
- "out of defined slots" - solar -> load -> battery

Feed-In Priority Mode:

- "discharge slot" - battery -> grid
- "charge slot" - solar -> battery (but load from grid only)
- "out of defined slots" - solar -> load -> grid

## Data logger

- Model: *S2-WL-ST*
- Version: *100121d0*

## Battery

- Sunwooda Atrix LV, 20kWh

## Solar Panels

- AIKO-A450-MAH54DW, 6.3kWp