![]() ![]() If it has a 3.3 kW (3,300 watts) the maximum current it can draw at 240 volts is 3300/240 = 13.75 Amps, so a 16 Amp charger on a 20 amp 240 volt outlet will provide plenty of power. In some cases, the vehicle’s onboard charger is the limiting factor, while in other cases the EVSE or electrical circuit it is plugged into is the limiting factor.įor example, older Nissan Leafs may come with a 3.3 kW charger, or a 6.6 kW charger if you paid extra for the DC fast charge port or the “charging package”. Your vehicle’s charger will automatically work with any EVSE, regardless of the number of amps it provides. How much this will cost you depends upon a lot of factors, and in this post I will outline all of the different options. The smallest size branch wire allowed is 14 gauge wire with a maximum circuit breaker size of 15 amps.Did you have an electric vehicle and want to start charging it with a Level 2 (240 volt) EVSE (charger) instead of the Level 1 EVSE (120 volt trickle charger) that came with the vehicle? Note: Branch circuit wires follow the same rules. All wiring between the generator 50-amp outlet and the transfer switch must be rated for 50 amps and no less, even if the load connected to the transfer switch is less than 50 amps. Note: A 50-amp outlet on a generator will have a 50-amp breaker. ![]() For example, even if your generator supplies less than 30 amperes, safety and NEC codes still require the use of 10-gauge wire or larger wire for a 30-amp inlet box. If the inlet is rated at 50-Amps, you must use wire rated for 50-amps. The wires from the inlet box to the transfer switch much meet or exceed the minimum wire size for a 30-Amp or 50-Amp breaker depending on the receptacle rating. Note: Most inlet boxes have a 30-Amp or 50-Amp Receptacle. This protects the outlet, the generator cord from the outlet to the inlet box, the inlex receptacle, and the wiring from the inlet receptacle to the transfer switch. A short circuit causes it to trip instantly. If the current through any outlet exceeds the outlet’s circuit breaker maximum for more than two or three seconds, the breaker trips. The row of pushbutton breakers protect the 30-amp 120-volt outlet, and the two 120-volt 20-amp GFCI household duplex outlets. The far left double pole 30-amp breaker controls the 120/240-Volt 30-Amp outlet that is second from left. On the control panel below, the large double pole 50-Amp circuit breaker located second from the right controls 240-Volt 50-Amp outlet on the far left. On most generators, the outlet is a 30-Amp or 50 Amp 120/240-Volt outlet and connects to a 30-amp or 50-amp 120/240-volt inlet box receptacle. For example, install a 50-Amp transfer switch and inlet box if your generator has a 50-Amp outlet and use a 50-Amp Generator Cord.Ī circuit breaker on the generator protects the outlet, generator cord, inlet box, inlet box wiring, and the transfer switch from an overload. It’s a good idea to pair the largest outlet on the generator to the inlet box and transfer switch. These outlets require a 120/240-Volt Plug on a Generator Cord for connection to the inlet box. ![]() Many Portable Generators have a 30-Amp or 50-Amp 120/240-Volt Outlet, or both. Transfer Switch Importance in Portable and Standby Generator Systems Generally, unless the homeowner is a certified electrician, local building departments may not permit the homeowner to install a whole house transfer switch without the help of a certified or licensed electrician. Yet another possibility is a manual transfer switch at the service entrance that allows a portable generator to feed the main service panel. When the power goes out, the generator supplies power through the manual transfer switch to the circuits selected at installation. Other transfer switches have the sub-panel built into them. Another single-load option is a critical appliance like a furnace or air conditioner. These control a sub-panel that distributes power to selected circuits by switching the sub-panel from utility power fed from the main service panel to portable generator power from the inlet box. Some manual transfer switches only supply a single load. Portable Generator Manual Transfer Switch Basics If that is the case, you may need more than one manual transfer switch for the home to make full use of the generator’s power capability. ![]() Very large portable generators like the Generac GP17500E watt may have multiple 30-Amp and 50-Amp receptacles. Typically, a portable generator that supplies a house will have a single 120/240-volt receptacle rated at 50-amperes or 30-amperes. The primary consideration is the amount of power the portable generator can supply and the available power outlets on the generator. The manual transfer switch that you select will depend on several factors. ![]()
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