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Input and Output Terminals
There are two sets of Input and Output
terminals. The Input terminals are on the
left side and the Output terminals are on the
right side of the unit. The Red terminal is +
or positive while the Black terminal is – or
negative. You must observe the correct polarity
when hooking up batteries, solar panels, wind
turbines or fuel cells to the terminals.
Specifications
The Renewable Energy Monitor will measure
electrical parameters up to the following limits:
Voltage:
0 - 28 VDC
Current:
0 - 1 amp DC
Power:
0 - 28 watts
Resistance: 0 - 999 ohms
Energy:
0 - 65535 Joules
RPM:
200 - 2500
Note: very low and very high RPM speeds
cannot be accurately measured. Even though
the wind turbine may be spinning the electronic
circuitry is only capable of measuring a certain
range of RPM speeds. Low voltage outputs
from the WindPitch wind turbine may also affect
RPM accuracy.
Common Equations
The Renewable Energy Monitor uses the
following common equations internally to
measure and compute voltage, current,
resistance and power.
V = I * R where V = voltage
I = current
R = Resistance
P = V * I where P = power
V = voltage
I = current
J = P * T where J = Joules
T = time in sec
Operating Tips
Electrical Fundamentals – Refer to the REES
Experiment Manual for an explanation of the
fundamental electrical parameters such as
voltage, current, power, resistance and more.
Measuring Resistance – A voltage must be
applied across the Input terminals in order to
measure the resistance attached to the Output
terminals.
Also, the resistance will vary depending on the
voltage and current produced in the circuit. The
Renewable Energy Monitor uses Ohm's Law
to compute resistance, so any small variations
in voltage and current will affect the resistance
reading.
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