The Complete Book of Boondock RVing : Camping Off the Beaten Path: Camping Off the Beaten Path by Bill Moeller

Author:Bill Moeller [Moeller, Bill]
Language: eng
Format: epub
Tags: Sports & Recreation, Camping
ISBN: 9780071490658
Google: nRtMmAEACAAJ
Publisher: Mcgraw-hill
Published: 2007-10-12T19:54:59.485230+00:00

Calculate the State of Charge

To calculate the state of charge, you need to convert your specific gravity readings to volts:

1. Compare the readings of the cells. If the reading of any individual cell varies by more than 50 points from the other cells, the cell may be bad; you should replace the battery.

2. Otherwise average the readings and add 0.84 (a constant) to this number.

3. Multiply this figure by the number of cells in the battery.

4. The resulting voltage is the state of charge.

Here is an example using a 12-volt wet-cell battery with six cells. If the average specific gravity equals 1.265:

1.265 (specific gravity) + 0.84 (constant) = 2.105

2.105 × 6 (number of cells) = 12.63 V (state of charge)

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