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Portable Generator Familiarization & Troubleshooting Guide
Section 2 • Generator Components & Systems
Battery Charge Circuits
Some portable generators may have battery charge
capability. If so, the stator assembly will include a battery
charge winding in addition to the (AC) power and excitation
(DPE) winding.With the engine running, a charging current
will be delivered to the unit's starting battery (electric start
units) or to a 12VDC receptacle on the receptacle panel
(manual start units). Measured battery charge winding (AC)
output is approximately 8-9VAC (RMS).To find "Root Mean
Square," multiply 8 - 9 x 1.414 = 12.762.The (AC) output
from the stator battery charge winding is changed to direct
current (DC) by one or more diodes in the circuit.
Early production units were equipped with battery charge
circuits, as shown in Figure 2.61, consisting of a single
winding and a single diode.
Figure 2.61 — Battery Charge Windings (BCW)
Later production generators may be equipped with dual
battery charge windings and a pair of diodes
(Figure 2.62).These units are equipped with dual stator
windings and dual diodes, to provide "full-wave" rectification.
Some battery charge windings are made up of four "multi-
tap" windings. Leads 66 and 77 (brown) are used for 12VDC
output to a charging receptacle on the unit panel.
GENERATOR SYSTEMS
10
Figure 2.62 — Electric Start Unit
Leads 66A and 77A (yellow) are used when the winding
output is delivered to the generator's own battery
(Figure 2.63).
Figure 2.63 — Multi Tap Battery Charge Windings
41
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