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How to Convert 24V BCM to 36V

The main difference between the 24v and 36v versions of the battery condition meter (BCM) is that the reference zener diode is changed. On the 24v version, a 9v1 zener is used. For 36v operation this is changed to 20v.

Minor adjustment of the centre point is done by altering R7: for 24v operation this is 330 Ohm. For 36v it is 270 Ohm.

Be aware that zener diodes can vary in accuracy and R7 can be altered as necessary to compensate.

R7 alters the centre-point of the display range. The span of the meter is fixed by the LED voltage drops and cannot be altered.

BCM5 layout