The BCD601 battery equalizer safely permits 12 V to be drawn of a 24 V Battery bank. The unit is connected across the 24 V battery bank and its output is connected to the 12 V midpoint of the battery bank. 12 V loads may now be connected to the lower battery and providing the average load is less than the output capacity of the battery equalizer, both batteries will be maintained at the correct voltage. The BCD601 has a capacity of 50 A. Units can be connected in parallel for even greater capacity. The way that these units work is that the output is set to exactly of the input voltage. Then as the load on the lower battery is applied, the unit takes current from the upper battery and feeds it to the lower battery to keep each at exactly of the total voltage. The units are compatible with all 24 V battery chargers and alternators. Available options include a remote control and/or extra wide temperature. We are confident that you will get many years of reliable service from this battery equalizer.