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ECET425L Lab 1: SLA Batteries Objectives:
Parts List:
Introduction: Sealed Lead Acid (SLA) batteries or valve regulated lead acid (VRLA) have been used for over forty years. They are one of the most economical batteries to use. They are used in mobility (wheelchairs), backup power (alarm systems) and in many solar applications. The basic principles of batteries can be used for multiple chemistries. Step 1: Battery Definitions Define the following: DOD (Depth of Discharge) Capacity Battery Cycle Battery Cycle Life SOC (State of Charge) Puekert Effect Cyclic Battery Applications (wheelchair) Standby Battery Applications (alarm) Step 2: Questions about the SLA Battery Spec Sheet (45565) Note: A 5 amp-hour battery does not mean the battery will output a current of 5 amps for one hour. Standard SLA capacities are measured at C/20 with C being the amp-hour rating of the battery. 1. At what current will the battery have a capacity of 5 amp hours? 2. At a current of 3 amps what is the run time and the capacity? 3. What is the maximum charging current for the battery? 4. What is the maximum charging voltage for the battery? 5. How many cycles can we get at a 100% DOD? 6. How many cycles can we get at a 50% DOD? 7. How many cycles can we get at a 30% DOD? 8. At a temperature of 0 degrees F what is the capacity at C/10 or .1C? Step 3: Procedure 1. Measure the battery voltage and from this voltage state the battery capacity. Use the open circuit voltage vs. the residual capacity graph on the second page of the spec sheet. 2. Connect the 30 ohm resistor and the G4 LED lamp across the battery and measure the current through each one. 3. State how long the resistor and the G4 LED would operate at a 100% DOD and a 50% DOD. Step 4: Calculations and Series Parallel Connections 1. A 48VDC, 120VAC 60 hertz inverter would require how many 6 volt batteries in series to operate it? 2. A typical 4000 watt sine wave inverter would require how much current from a 12 volt battery at full output power? Assume 100% efficiency. Remember Power=Voltage*Current 3. If two 12 volt 100 amp-hour batteries are used. What is the voltage and capacity if the batteries are in parallel? What is the voltage and capacity if the batteries are in series?
Design a combinational logic with 3 inputs x, y and z and three outputs A,B C. When the binary input is 0,1,2 or 3 the binary output is two greater than the input. When the binary input is 4,5,6,7 the binary output is 3 less than the input.
build a circuit for a parking deck where a binary counter counts up when a car comes in and down when one leaves. There can only be a maximum of 40 cars in the parking deck before an LED turns on to notify the parking deck is full.
a). Find the resistance of the aluminum wire 1 m long and 1 mm in diameter. For aluminum, resistivity is 2.8e-6 ohm-cm. b). What is the voltage drop across the wire for a current of 1 A The strength of the electric field inside the wire
how many bits are required to represent the decimal numbers in the range from 0 to 999 using straight binary code?
Operational amplifier - Finding the offset voltage, An operational amplifier has a gain of 20. The input voltage is 125mV and the input bias current is zero.
A circuit has a Thevenin equivalent circuit consisting of a voltage source of 10 V and an output resistance of 20 O. A non-ideal voltmeter is used to measure the source voltage. What will be the measured voltage if the voltmeter has an input resis..
What is the de Broglie wavelength of an electron at 150eV. what is the wavelength for electrons at 10keV, which istypical of electron microscopes. Comparing this to visiblel light,comment on the advantages of electron microscopes.
A generator provides the following voltage signal: v(t) = 2 + 3 sin(100pi) + 4 cos(250pi). Find the average value of the function. Note: pi = 3.1416 in this equation.
The capacitance of a capacitor formed by two parallel metal plates each 200 cm2 in area separated by a dielectric 4 mm thick is 0.0004 microfarads. A p.d. of 20,000 V is applied. Calculate (a) the total charge on the plates
Compare the three rectifier ( half wave, full wave and bridge rectifier) to design a 20 V supply with 1V ripple for a 1Kiloohms load. In the comparison look for the filter capacitor, transformer turn ratio n and the PIV of the diodes.
Explain Using artificial aggregate productions methods
A 12-v automobile battery has an output capacity of 100 ampere-hours(Ah) when connected to a head lamp that absorbs 200watts of power. the battery voltage is constant. a) What is the current supplied by the battery
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