Maintenance
Manual_Grid_Power_FNC_en_V3_0
42
4. Close the top opening of the glass tube with the index finger and remove it from the cell.
1 = Glass tube for measuring
2 = MAX electrolyte level
3 = Top of separator
4 = MIN electrolyte level
H1 = Height from open cell plug to
MAX electrolyte level
H2 = Reserve of electrolyte between
MIN and MAX label
H3 = Measurable electrolyte height
range
The following table shows the measured electrolyte level according to the cell type
(distinguished by the enclosure height):
Enclosure
height [mm]
Level measured
with the glass tube
[mm]
Description
217
5
Middle between Min and Max
19
Maximum level
276
15
Middle between Min and Max
36
Maximum level
373
22.5
Middle between Min and Max
55
Maximum level
5. If the level is higher than the middle between minimum and maximum level no further
action is necessary. Otherwise, you have to refill the electrolyte levels with distilled water
to the to the maximum level, refer to
10.6 Fill up the Electrolyte Level with Distilled Water
on page 46.
ATTENTION!
Use only distilled water in accordance with EN 60993 for topping up the battery cells.
Filling the cells with acid or acidic water destroys the cells of the grid|power FNC
®
batteries.
Tap water impairs the battery performance.
6. Close or remount the plugs.
7. Clean the battery system if necessary, see
10.5 Cleaning on page 45
