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DiscoverCircuits.com -- Hobby Corner
Last Updated on:
Tuesday, June 01, 2021 03:06 PM
Hobby Circuits List
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graphics of Discovercircuits.com are copyright protected.
LINK to Dave's circuit, but DO NOT COPY any files to your WEB
SITE server |
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More
Battery Monitors
Indicators |
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Lead-acid Battery Low Voltage
Indicator |
Lead-acid batteries should not be discharged below a certain voltage.
Discharging a cell below about 1.8v and can often damage it, which will result in a
lower Amp-hour capacity. Large battery banks are critical in off-grid energy
storage systems. One bad cell in a series wired string will weaken the whole
bank. The circuits below are designed
to be connected across either a single 2
volt cell or a 6v three cell battery bank. It will alert the user of a weak
cell by turning on a red LED when the cell voltages drop below 1.8v. The
circuit takes advantage of a low voltage LMP2231 op Amp from Nation Semiconductor
and a LM385 voltage reference in the first circuit. In that circuit the red LED must
have a forward voltage of about 1.6v at 5ma, in order to operate properly. In
the second three cell bank circuit, a TLV3701 voltage comparator is used. The
circuits are simple enough that they could be placed on a postage stamp size circuit
board. |
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2v Lead-acid Cell
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6v Lead Acid Battery
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Click on Circuit Below to view PDF of Schematic |
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