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The actual voltage, matching the car battery's voltage, will be approximately 12.5 volts when dormant (less in cold conditions), approximately 14.5 volts when the engine and the alternator/generator are operating (more when cold), and may briefly drop as low as 5–6 volts during engine start due to the high temporary battery current usage. [12]
Most operate on propane or AC (two-way), while some add 12 volts DC (three-way). Three-way (powered) RV refrigerators draw too much current to be powered by the house batteries, but may run on 12-volt DC power while the vehicle engine is running, a generator is running or the RV is connected to shore power.
A typical 12 V, 40 Ah lead-acid car battery. An automotive battery, or car battery, is a rechargeable battery that is used to start a motor vehicle.. Its main purpose is to provide an electric current to the electric-powered starting motor, which in turn starts the chemically-powered internal combustion engine that actually propels the vehicle.
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Trucks usually have a 24 V supply using two 12 V automotive batteries in series: it is therefore possible to jump-start a vehicle with a 12 V electrical system using only one of the two batteries. [11] Vintage cars may have 6-volt electrical systems, or may connect the positive terminal of the battery to the chassis.
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