Battery Calculations and Hookup Sequence

Ordinary 12 volt car batteries, when hooked up in series are capable of supplying very high (and lethal) voltages. Yoi can in actual fact run a high voltage all-electric home off only a bank of 12 volt car batteries and your alternator power unit connected up for battery re-charging - no other major generating equipment is necessary.

Before scoffing at this idea, read the chapter on 'Battery Facts'. You will learn about buying good batteries for a dollar or two, and techniques to add 12 - 18 months extra life to each battery, so a bank of 20 batteries is quite reasonable and practical.

Your alternator will fast charge these batteries quite rapidly, arid the actual stored battery power, i.e.: battery capacity in amp hours is enormous if you connect them in'parallel' at low volts.

Also remember that you can run most things, i.e.: lights, heaters and brush type motors on DC. In fact an ordinary 240 volt electric drill for example will run just as well on DC. If you happen to have only 120DC, then the drill simply runs at half speed and half power. A good solid bank of batteries is practical and useful, particularly if your drive motor or alternator fails unexpectedly. There are three ways to hook up the batteries. These are:

1. In Series - This steps up the voltage, but the amp hour capacity remains the same. For example two 12V batteries of 100 amps hours each, hooked up in series gives 24 volts with 100 amp/'gr capacity. Ten 12 volt batteries give 120 volts, but still retaining the original 100 amp/hr capacity.

2. In Parallel - This method steps up the capacity, but the voltage remains the same. For example, two 12 volt 100 amp/hr batteries in parallel gives only 12 volts, but 200 amp/hr capacity,

3. Combined "In Series "¡"In Parallel" - This method gives any desired combination of either a specific voltage, or a specific capacity. For example four 12 volt 100 amp/hr batteries can combine to supply either 48 volts at 100 amp/hr, 12 volts at 400 amp/hr, or 24 volts at 200 amp/hr. The hook-up sequence is as follows:

"In Series" - Four 12 volts = 48 volts. Amp/hr capacity remains the same as a single battery.

"In Parallel" — Voltage remains the same but amp increases, e.g.: 4 x 100 amp/hr = 400 amp/hr at 12 volts.


Connect positive to positive, negative to negative (like the jumper leads on a car). Combined "In Series"/"In Parallel" — Voltage and/or amp capacity can be varied.

DIY Battery Repair

DIY Battery Repair

You can now recondition your old batteries at home and bring them back to 100 percent of their working condition. This guide will enable you to revive All NiCd batteries regardless of brand and battery volt. It will give you the required information on how to re-energize and revive your NiCd batteries through the RVD process, charging method and charging guidelines.

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  • SUVI
    How to hookup 20 12 Volt Batteries together?
    7 years ago

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