How many volts should a power supply output be?

Let's also say your (marginal) power supply output voltage is 24V-3.5%; that is, 23.16V. Both of these conditions together mean that you have a measley 0.24 volts to work with if you're gonna design for worst case. And just to be safe, your voltage drop at maximum load current should not exceed half that value, i.e., 0.12 volts!

What voltage supply should I get?

The best way to go is to get a ±15V supply, unless you really know what you're doing. Asking the question probably means you should just buy (or build) one!

Can I plug my RV in without a power supply?

When you are not at a site where 50 or even 30 amps is available, you can still plug your RV in and use the current electrical system at that site. As long as it is wired for 110-120, you can make a connection. But to make this connection, you need to use up to 2 different adapters.

How many volts does a 50 amp system use?

The total number of volts the 50 amp system will use is 240 but that is if the appliances are using both hot legs at the same time. The appliances are not using 240 volts, but both legs are working at the same time so adding the two 120 volts together and you get 240 volts.

How much power does a 30 amp RV use?

That means, the appliances, etc., in your RV only use 120 volts of power, not 240. It is rare to see anything but a very high-end RV using both legs and 240 volts of power. Just so you know, the 30 amp option only draws around 3,600 watts. How Much Electricity Does a 50 Amp RV Use?

Which Transformer wattage should I buy?

In this example of installing your landscape lights with specific wire gauges as another consideration for which transformer wattage to buy, we can benchmark some calculations knowing that typically, a 300-watt transformer can power 100 feet run using 16 gauge, or 150 feet using 14 gauge, or 200 feet when using the most popular 12 gauge cables.