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Topic: Solar/PhotoVoltaic DC Wattage to 208VAC 3-Phase Amps

User: franklinmanklin, Location: Michigan

Asked on: Wednesday, April 6, 2011 at 7:15 am EDT
Answered on: Tuesday, May 14, 2024 at 3:50 am EDT

Question: I am trying to find the correct calculation for 31kW Solar Panels in DC to amperage in 3-Phase 208VAC.Is this the correct formula?A=W/208 x 1.73whereas A = amps and W = wattsThank you in advance...

Incorrect Formula

The formula A = W/208 x 1.73 is incorrect for calculating the amperage in 3-Phase 208VAC for a given DC power of 31kW.

Correct Formula

The correct formula for calculating amperage in a 3-Phase system is:

A = W / (√3  V  PF)
where: A = amperage W = power in watts (31kW = 31,000W) √3 (square root of 3) ≈ 1.732 (for 3-Phase systems) V = voltage in volts (208V) PF = power factor (assumed to be 1.0 for unity power factor)Calculating Amperage

Plugging in the given values:
A = 31,000 / (1.732  208 * 1.0)
A ≈ 88.2 amps
Therefore, the amperage in a 3-Phase 208VAC system for 31kW of solar panels in DC is approximately 88.2 amps. Flag for review

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