The Complete Book of Boondock RVing by Bill Moeller

Author:Bill Moeller [Moeller, Bill]
Language: eng
Format: epub, pdf
ISBN: 0071594868
Publisher: McGraw-Hill Education
Published: 2008-04-15T04:00:00+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)

You can also use a table, such as Table 8-6 on page 88.

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