Define retrorockets. retrorockets synonyms, retrorockets pronunciation, retrorockets translation, English dictionary definition of retrorockets. n. A rocket engine used to retard, arrest, or reverse the motion of a vehicle, such as an aircraft, missile, or spacecraft. n a small auxiliary rocket...
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A typical portable combined VCR/TV might use 55 Watts. That means it draws 55/12 = roughly 4.5 Amps. 50/4.5 = 11 hours. If you want the battery to last, call it 6 hours.OK, now you can work it out for your own battery and equipment. Downlighters come in various Wattages so you need to decide how bright you need them first of all. Usually 5 Watts, 10 Watts or 20 Watts.ssume an inverter efficiency of 80%. That means it draws 2.5 Amps from the battery. Assume the battery rating is 60 Ampere Hours but it is 2 years old so reduce that to 50 AH. 50/2.5 = 20 hours.