Electrical units... November 05, 2010, 12:57:50 pm Yahoo Message Number: 118028Here is a quick summary of electrical units and their relationships that we need to concern ourselves with in an RV:A X V = P or I X E =P:Either one means current(amps) X voltage(volts) = power (Watts) A X t = Charge, or A-hr = charge: Current X time = charge, usually with the time expressed in hours, thus amp-hours (A-hr) A-hr X V = energy: the charge a battery holds, times the voltage across the battery, is a measure of the total energy stored in that battery. Also note that energy = A X hr X V = A X V X hr = P X hr. So power X time equals energy. This is why two 6V batteries in series (to give 12V out) rated at 225 A-hr each are the energy equivalent of two 12V batteries in parallel rated at 112.5 A-hr each:225 X (2 X 6) = (112.5 X 12) X 2 = 2700 Watt-hrs Once you get the unit relationships done, it's just arithmetic. Battery specs list their voltage and charge capacity (A-hr). Other specs are not relevant to coach battery calculations, but may affect your choice of type and quality of product.Steve
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Topic: Electrical units... (Read 1 time)
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