One of the most common misconceptions regarding an indoor garden’s wiring is that a grower can save up to 50% on the electric bill by switching from 120 volts to 240 volts. The voltage at which an indoor garden is operated has nothing to do with the cost of electrical usage. Electric companies charge their customers for the amount of wattage used. This is usually marked on the electric bill as total kWh (kilowatt hours) usage. A kilowatt hour is a unit of measurement that represents 1000 watts being used for one hour of time. This is how most electric companies bill the user and how growers can compare rates. The most important fact to remember is that the user is always charged for the amount of wattage consumed, not volts or amps.
A room wired for 120 volts would usually consist of three wires: a hot wire (120 volts), a neutral wire, and a ground wire. A room wired for 240 volts would usually consist of four wires: two hot wires (120 volts each, totaling 240 volts), a neutral wire, and a ground wire. The exception to this would be some older homes where the ground wire wouldn’t apply. In this case, the 120 volt would have two wires (a hot wire and a neutral wire) and the 240 volt would have three wires (two hot wires and the neutral wire).
If a grower is serious about deciding whether to operate the grow room on 240 volts or 120 volts, they should first get an understanding of how volts, watts, and amps affect each other. The current (amperage or amps) is always equal to the power (wattage or watts) divided by the voltage (volts). In other words, amps = watts/volts.
Let’s use an example to see how 120 volts versus 240 volts affects the equation. The example grow room has 10,000 watts of electrical power requirements. At 120 volts, the garden would require 83.3 amps (10,000W/120V = 83.3A). If that same garden was wired for 240 volts, it would require 41.66 amps (10,000W/240V = 41.66A). The real benefit of operating a grow room at 240 volts is that it allows the grower to operate more lights (wattage) on the given amperage. Amperage is the limiting factor for many indoor horticulturists, especially growers who have the home’s electrical usage and garden’s electrical usage on the same electric panel. If a grower is considering changing this, or any of the wiring in their garden, they might want to visit this website so that they can find an electrician who will advise them and make sure everything is safe.
Since power companies charge by the kilowatt hour (or how many watts are consumed), there are no real financial savings by operating a garden at 240 volts versus 120 volts because the voltage does not affect the wattage being consumed. Although there is no financial savings, the advantage of freeing up addition amperage justifies many growers to opt for a 240 volt wired garden over a 120 volt wired garden. After all, by doubling the voltage, a grower can double the number of lights being operated and, therefore, double the entire size of the indoor garden. And, as far as indoor cannabis gardens go, the bigger the better!
Eric Hopper is the Editor in Chief for NUGL Media. He can be contacted at email@example.com.
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