Important to hold by following procedures:

1. Check correctness of the panel/battery.
2. Check for eventual mechanical damages
3. Clean the dust and other dirt.
4. Open cover on the lid of the panel.
5. Pouring through opening of the lid sulphuric acid density (1.28+0.01,-0.01)kg/l and (1.23+0.01,-0.01)kg/l kept at room temperature
   
6. All batteries and panels are soaked to level 20-25mm above the separators.
7. Filled battery or panel needs to be stationed for not less than 3 hours, not to soak the electrolyte.
8. After 3 hours, check the level of electrolytes and asses corrections with sulphuric acid.
• Remark: When measuring density and level of sulphuric acid, when needed undo the lid. After the measurements are finished close the lid.
9. After the corrections are done, battery or panel needs to be dried and cleaned.
10. Connect positive pole of the battery/panel with positive rectifier hatch and negative pole with negative source of the electric circuit.