TDA9151 ground pin function and maintenance data | parameter table
| Foot number | symbol | Normal voltage / V | Function Description |
| 1 | HFB | 0.9 | Reverse input |
| 2 | DSC | 0.9 | Sandcastle pulse input/output |
| 3 | PROT | 0.9 | Overvoltage protection input |
| 4 | AGND | 0 | Analogue |
| 5 | LLCS | 0 | Line trivial clock selection eight |
| 6 | EWOUT | 2.5 | Pincushion correction output |
| 7 | EHT | 4.4 | High pressure compensation |
| 8 | ROOHV | 3.9 | External resistance change |
| 9 | FLASH | 0 | Quick detection input |
| 10 | VOUTB | 1.2 | Field output B |
| 11 | VOUTA | 1.1 | Field output A |
| 12 | VA | 0.1 | Field information input |
| 13 | UA | 0.4 | Line information input |
| 14 | LLC | 1.8 | Line lock clock input |
| 15 | DGND | 0 | Digitally |
| 16 | VCC | 8.8 | powered by |
| 17 | SDA | 3 | Bus data input/output |
| 18 | SCL | 3 | Bus clock input |
| 19 | OFCS | 3.2 | Center offset correction output |
| 20 | HOUT | 3.6 | Line pulse output |
The On-grid system is connected with utility grid and this system would work only if the grid is available. In case of a power cut, the system will not work and hence the On-grid system is also termed as a Grid-tied system. Grid is required since the inverter needs to be provided a reference voltage and the inverter needs to sync with the grid in order to export energy back into the grid.
On grid systems make sense for locations with no daytime power cut or with less than 2 hrs of daytime power cut. This type of system is apt for reducing your electricity bills since it is cheaper than a Battery based system and there is no recurring cost of replacement of panels.
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