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This is useful, for example, at RV parks where TT-30 ("Travel Trailer" - 120 V, 30 A) receptacles are common. These allow charging at up to 24 amps. However, this level of 120 V charging has not been codified into J1772. Another extension, supported by the North American Charging System, is Level 2 charging at 277 V.
On trucks, the voltage of the power outlet may be near 24 V DC. The 12 V power circuit is protected by a car fuse , often rated at 10 to 20 amperes, which provides 120 to 240 watts of power. Large appliances such as hair dryers or toasters draw too much power to be fed from an auxiliary power socket.
Brake controller A device used to control the electric brakes on the trailer. Taking power from the tow vehicle's battery, it is activated by sensing voltage to the brake lights. Upon this signal it sends power, through the seven-way plug at the rear, to the electromagnets inside the trailer's brake drums, activating the brakes.
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The NEMA TT-30 (TT stands for Travel Trailer) connector is a 120 V 30 A recreational vehicle standard (hot-neutral-ground), also known as RV 30. The TT-30R receptacle is commonly available in nearly all RV parks in the United States and Canada, and all but the largest RVs manufactured since the 1970s use this plug to connect to power feeds.
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RV-C is based on Controller Area Network, and operates at a bus speed of 250 kbit/s.Data is contained in packets consisting of a header and eight data bytes. The header contains an 8-bit Source Address and a 17-bit Parameter Group Number, as well as a few additional bits.
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