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5.1.1 Outputs - Energy measurements – PowerBOX 4Kx only
PowerBOX 4Kx measures the following electrical parameters every 500ms for Output 1, 2, 3 and 4.
The values in the web interface are updated every 5 seconds.
Figure 13 – Measured values
Load in watts [W] corresponds to the immediate current and voltage (P = U * I * TPF). It respects the
direction – positive value if the connected device consume the energy or negative value if the
connected device deliver the power back to the power grid (e.g. solar power system).
Current in amps [A] shows the immediate current flowing through the output. Always positive value.
Voltage in volts [V].
TPF (True Power Factor) shows the ratio of active and apparent power, or the ratio of resistance
and impedance. TPF is the ratio of the active power to the apparent power at the power outlet. TPF
shows what portion of apparent power is converted by the load to active power. TPF can be viewed
as the sum of useful power and losses. TPF, unlike PF (Power Factor), also takes into account non-
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