9. When charge is complete replace vent plugs.
The Relation Between Various Sizes of Westinghouse Farm Light Batteries and Work to be Done
The size of the battery furnished with complete farm lighting units vary greatly. Sometimes the battery size is varied with the size of the engine and generator, while again the same size of battery may be used for several sizes of engines and generators. In making replacements, while it is always necessary to retain the same number of cells, it is not necessary to retain the same size of cells.
Usually increasing the cell size increases the convenience to the owner and prolongs the life of the battery to an amount which warrants the higher cost.
With a larger battery, danger of injury through overcharging is lessened, the load on the battery is more easily carried and the engine and generator operate less frequently.
In order to give an idea of various battery capacities, below is a table showing the number of 32 volt, 25-watt lamps which may be lighted for various lengths of time from sixteen cells. The number of hours shows the length of time that the lamps will operate.
Table A
| Type | 3 Hours | 5 Hours | 8 Hours |
| G-7 | 22 Lamps | 14 Lamps | 10 Lamps |
| G-9 | 28 Lamps | 19 Lamps | 13 Lamps |
| G-11 | 32 Lamps | 24 Lamps | 15 Lamps |
| G-13 | 41 Lamps | 29 Lamps | 19 Lamps |
| G-15 | 47 Lamps | 33 Lamps | 22 Lamps |
| G-17 | 54 Lamps | 38 Lamps | 25 Lamps |
Note:—Based on 32-Volt 25-Watt Lamps.
For example — The table shows opposite G-7 that, with the battery fully charged, twenty-two lamps may be lighted for three hours, fourteen lamps for five hours and ten lamps for eight hours, by a sixteen cell G-7 battery, without operating the engine and generator.