Table B
| H.P. of Motor | No. of Watts | Corresponding No. of 25-Watt Lamps |
| 1/8 | 93 | 4 |
| 1/4 | 185 | 7 |
| 1/2 | 373 | 15 |
| 3/4 | 559 | 22 |
| 1 H.P. | 746 | 30 |
From table B it will be seen, for example, that a one horsepower motor draws from the battery 373 watts or the same power as do fifteen 25-watt lamps. Then referring to table A, it will be found that a G-11 battery could operate 15 lamps or this motor alone for 8 hours.
Due to the fact that a motor or electric appliance may become overloaded and therefore actually use many more watts than the name plate indicates, it is not advisable to operate any motor of over 1/4 H. P. or even an appliance of over 186 watts on the G-13 or smaller sizes unless the engine and generator are running.
It is safe, however, to operate motors or other appliances up to 375 watts on the G-15 or G-17 batteries without operating the engine and generator.