Comparing the Battery With Other Power Sources

7/27/2019 Comparing the Battery With Other Power Sources

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Comparing the Battery with other Power Sources

This article begins with the positive traits of the battery, and then moves into the limitations when compared with other power sources.

Energy storage

Batteries store energy well and for a considerable length of time. Primary batteries (non-rechargeable) hold more energy than secondary (rechargeable), and the

self-discharge is lower. Alkaline cells are good for 10 years with minimal losses. Lead-, nickel- and lithium-based batteries need periodic recharges to compensate for lost

power.

Specific energy (Capacity)

A battery may hold adequate energy for portable use, but this does not transfer equally well for large mobile and stationary systems. For example, a 100kg (220lb) battery

produces about 10kWh of energy an IC engine of the same weight generates 100kW.

Responsiveness

Batteries have a huge advantage over other power sources in being ready to deliver on short notice think of the quick action of the camera flash! There is no warm-up,

as is the case with the internal combustion (IC) engine; the power from the battery flows within a fraction of a second. In comparison, a jet engine takes several seconds to

gain power, a fuel cell requires a few minutes, and the cold steam engine of a locomotive needs hours to build up steam.

Power bandwidth

Rechargeable batteries have a wide power bandwidth, a quality that is shared with the diesel engine. In comparison, the bandwidth of the fuel cell is narrow and works

best within a specific load. Jet engines also have a limited power bandwidth. They have poor low-end torque and operate most efficiently at a defined revolution-per-minute

(RPM).

Environment

The battery runs clean and stays reasonably cool. Sealed cells have no exhaust, are quiet and do not vibrate. This is in sharp contrast with the IC engine and larger fuel

cells that require noisy compressors and cooling fans. The IC engine also needs air and exhausts toxic gases.

Efficiency

The battery is highly efficient. Below 70 percent charge, the charge efficiency is close to 100 percent and the discharge losses are only a few percent. In comparison, the

energy efficiency of the fuel cell is 20 to 60 percent, and the thermal engines is 25 to 30 percent. (At optimal air intake speed and temperature, the GE90-115 on the

Boeing 777 jetliner is 37 percent efficient.)

Installation

The sealed battery operates in any position and offers good shock and vibration tolerance. This benefit does not transfer to the flooded batteries that must be installed in

the upright position. Most IC engines must also be positioned in the upright position and mounted on shock- absorbing dampers to reduce vibration. Thermal engines also

need air and an exhaust.

Operating costLithium- and nickel-based batteries are best suited for portable devices; lead acid batteries are economical for wheeled mobility and stationary applications. Cost and

weight make batteries impractical for electric powertrains in larger vehicles. The price of a 1,000-watt battery (1kW) is roughly $1,000 and it has a life span of about 2,500

hours. Adding the replacement cost of $0.40/h and an average of $0.10/kWh for charging, the cost per kWh comes to about $0.50. The IC engine costs less to build per

watt and lasts for about 4,000 hours. This brings the cost per 1kWh to about $0.34. Read more about the Battery Against Fossil Fuel.

Maintenance

With the exception of watering of flooded lead batteries and discharging NiCds to prevent memory, rechargeable batteries require low maintenance. Service includes

cleaning of corrosion buildup on the outside terminals and applying periodic performance checks.

Service life

The rechargeable battery has a relatively short service life and ages even if not in use. In consumer products, the 3- to 5-year lifespan is satisfactory. This is not

mparing the Battery with other Power Sources Batte... http://batteryuniversity.com/learn/article/comparin

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acceptable for larger batteries in industry, and makers of the hybrid and electric vehicles guarantee their batteries for 8 to 10 years. The fuel cell delivers 2,000 to 5,000

hours of service and, depending on temperature, large stationary batteries are good for 5 to 20 years.

Temperature extremes

Like molasses, cold temperatures slow the electrochemical reaction and batteries do not perform well below freezing. The fuel cell shares the same problem, but the

internal combustion engine does well once warmed up. Charging must always be done above freezing. Operating at a high temperature provides a performance boost but

this causes rapid aging due to added stress. Read about Discharging at High and Low Temperatures.

Charge time

Here, the battery has an undisputed disadvantage. Lithium- and nickel-based systems take 1 to 3 hours to charge; lead acid typically takes 14 hours. In comparison, filling

up a vehicle only takes a few minutes. Although some electric vehicles can be charged to 80 percent in less than one hour on a high-power outlet, users of electric

vehicles will need to make adjustments.

Disposal

Nickel-cadmium and lead acid batteries contain hazardous material and cannot be disposed of in landfills. Nickel-metal-hydrate and lithium systems are environmentally

friendly and can be disposed of with regular household items in small quantities. Authorities recommend that all batteries be recycled.

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Comments

On August 1, 2011 at 2:59am

hoh wing tuck wrote:

Hi, I manage all the UPS installation across the Asia Pacific region.

I notice we have slightly different voltages for different sites. The charging voltages range from 13.32 - 13.70 volts [per battery block]. According to some of the UPS manufacturers, the

charging voltage should be 13.65 Volts and not lower.

We use mainly Valve Regulated Lead Acid battery for our UPS systems

How can I determine what is the optimum charging voltage for the systems.

What will happen is the charging voltage is too low or too high. What is too low and too high.

On March 20, 2012 at 5:10pm

Frank Nichols wrote:

Q: My home security system came with a 12-volt 4ah rated battery ... is there a problem if I use a 12-volt 5ah battery to replace? Both are sealed acid type batteries. Thanks.

On October 29, 2012 at 3:21am

alyas wrote:

hellow

i have a question about battery element tester

can i now , how work the element tester?

what about riplle and level on the battery element tester?

thanks

On February 27, 2013 at 1:55pm

eric wrote:

Hello, I was wondering how many cordless drill batteries are sold in the united states. I am doing a project on cordless drill batteries and needed to know statistics and the market for cordless

drill batteries. Thank you

On June 26, 2013 at 8:11pm

Cori wrote:

I am designing a solar panel to charge a 12 volt 6 watt battery that will in turn charge an outsides flow meter. (must be rechargeable) It will experience freezing temperature to high temperature

of 99 Farenhiet. It will experience humidity. It will only have have a few hours to recharge due to optimal sunlight conditions. I want the battery to last a least a year to two years instead of its

initial 4 months. The battery will be in constant use. What is the best type of battery for me? I have a decent budget, but it is not that large.

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Comparing the Battery With Other Power Sources