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A 24-volt battery is one that provides electrical voltage at 24 volts. It may be a single battery or a combination of two 12-volt batteries connected in series.
Regular lead-acid batteries are common because they are generally cheaper. However, more expensive battery types offer certain advantages over them. AGM batteries have a longer lifespan and are fully sealed to prevent the possibility of acid leakage, making them virtually maintenance-free. Alternatives are gel type, suitable for deep discharging, and lithium-ion batteries, which last the longest.
A 24-volt battery pack usually comprises two 12-volt batteries with their terminals connected in series. Don't mix different battery types. Make sure all the connected batteries are of the same type to prevent damage. Besides the batteries having a total voltage of 24 volts, users will need a power cable and a connector cable, also called a jumper wire. Normally, an 8-gauge (AWG) DC wire is sufficient, but a thicker 6-gauge one is needed to minimize the voltage drop if the 24-volt battery wiring extends beyond 20 feet. Cables with red and black wires are normally used for the positive and negative connections, respectively.
Two or more batteries are joined together in series by connecting their unlike terminals together. For example, making a 24-volt battery pack using two 12-volt batteries requires a connector cable or 24-volt battery jumper to connect one battery's positive terminal to the other's negative terminal. Place the two batteries adjacent. Only one jumper wire is required for each pair of batteries. The other power cable connects to the remaining end terminals of each battery. Connect the red wire to one battery's positive terminal marked with a plus (+) sign and the back wire to the other battery's negative terminal marked with a minus (-) sign. The power cable's other ends connect to the appliance being powered.
A 24-volt battery charger is essential equipment for charging vehicle batteries quickly. Otherwise, users would have to rely on the vehicle's alternator, a UPS, or a solar panel. Attach the charger's red cable to the battery's positive terminal and its black one to a metallic part of the vehicle's engine. Set the voltage to match the required 24 volts or 12 volts if charging separately. Set the amperage level to at least 2A or up to 10% of the battery's rated capacity in amp-hours. Generally, a higher amperage will enable quicker charging. A 24-volt battery maintainer is another useful instrument to have when storing batteries. It helps preserve their charge by providing a slow trickle charge at intervals.
When testing the battery pack using a 24-volt battery tester, set it to DC volts and attach the probes to the two end terminals of both batteries to which the power cable is connected. The reading should be close to 24 volts while powered off or a little higher when the appliance is running. If the reading is less, the batteries may need recharging. If it is significantly less, check each battery individually for whether it gives 12 volts by attaching the probes to both terminals of the same battery. If recharging has no effect, the battery may be weak and need replacing.
