Power outage can be a common occurrence during a severe rain storm. The sump system in a home typically relies on a heavy duty AC primary pump to discharge water entering the home through its drainage system. To compensate for the possibility of a power outage, the sump pit may include a battery-operated DC or AC driven pump in addition to the primary pump. How do these AC/DC pumps differ in function and performance?
A DC based back up system typically consists of a DC pump, a 12 volt deep cycle battery (2 batteries if a 24 volt system), and a charger. Most DC pumps used as part of a back-up system were initially designed to be bilge pumps for boats and are not heavy duty, but some work well. A characteristic of a DC system versus an AC system is that the rate that it discharges is related to the degree that the battery power source is charged. A fully charged 12 volt battery will power the DC pump to its maximum capability. As the charge of the battery is consumed, the pumping rate of the DC pump diminishes. For example, a given pump will discharge at the rate of 30 gallons per minute with a fully charged battery, but may only be pumping at 15 gallons per minute when half of the charge is still left with the battery. At the end when the battery is about to be depleted, the pump may be discharging at less than five gallons per minute. DC systems efficiently consume DC current and can run continuously for several hours (up to 10 hours continuously and intermittently for several days).
12 Volt Drill
An AC based back-up system typically consists of an AC heavy duty pump, a 12 volt deep cycle battery (or two batteries if a 24 volt system), and an inverter with a battery charger). An inverter converts the DC power of the battery to its AC counterpart. Unlike a DC pump, an AC pump will run close to its maximum potential capability until the battery charge is depleted. For example, if the AC pump can pump at a rate of 50 gallons per minute, it will continue at close to this rate (with minimal loss over time) until the battery power source is depleted. It is important to select an AC pump with efficient amperage rating (3-7 amp hours), otherwise the system will not run long enough before the battery source is depleted and the system shuts down. An efficient AC pump can discharge as much as the best DC system because it is discharging at a greater rate than most DC systems even though it shuts down faster than a good DC pump system. The key advantage of going with an AC system is that it is easier to match it up with its primary pump counterpart. Since the AC system requires an inverter, it is typically more expensive than DC systems which do not require an expensive inverter for its operation.
The best way to compare different available systems is to compare the total amount of gallons discharged with a given battery (beginning with a fully charged battery recommended by the manufacturer) and that the data, ideally determined by an independent testing agency, represents the time and performance until the system shuts down). The values should have been generated at an 8-10 ft. head. The head is the distance that the pump discharges vertically (in a basement, it is usually 8-10 ft).
For the most part, A DC system will discharge at a rate less than the primary pump can discharge. Whether this is good enough is something that the homeowner and/or contractor must make a judgment call on. An AC system can be matched more effectively to the performance of the primary pump. The best scenario is that the homeowner has determined how effectively his primary pump has performed during a major storm and matches that performance with that of the back-up system, whether it be an AC or a DC system.
Special Price!!! Hitachi DS12DVF3 12-Volt Ni-Cad 3/8-Inch Cordless Drill/Driver Kit
Nov 08, 2011 11:41:33
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Hitachi DS12DVF3 12-Volt Ni-Cad 3/8-Inch Cordless Drill/Driver Kit Feature
- Class leading 230 in./lbs of torque to power through the toughest jobs
- 22-stage clutch for high torque and/or precision driving; soft, non-slip elastomer grip for increased user comfort
- Convenient 5-position belt hook features an integrated bit holder
- Includes drill, flashlight, two 1.4Ah batteries, quick charger, carrying case and driver bit
- Compact and lightweight-only 7.5 inches in length and 3.3 pounds; 5-year warranty
Hitachi DS12DVF3 12-Volt Ni-Cad 3/8-Inch Cordless Drill/Driver Kit Overview
Compact and comfortable best describe this 12V drill from Hitachi that delivers 230 in. lb. of torque while weighing only 3.3 lb. The RPM range on this tool is 0 to 350 in low speed and 1 to 1050 in high speed with a 22 stage torque adjustable clutch. Soft grip handle and convenient belt hook keep the drill comfortable and convenient. This tool comes with 2 batteries, charger, bit set, flashlight, and carrying case.Hitachi DS12DVF3 12-Volt Ni-Cad 3/8-Inch Cordless Drill/Driver Kit Specifications
The Hitachi DS12DVF3 12-Volt, 3/8-Inch Driver Drill Kit with Flashlight offers professional-grade performance in a convenient package. The drill has a two-speed transmission and 22-stage clutch that make it ideal for working in wood, plastic, mild steel, and aluminum. And with a compact, lightweight design, the drill reduces user fatigue and fits into tight spaces. In addition to the drill, the DS12DVF3 kit includes a bit set, flashlight, quick charger, and more.
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 22-stage clutch offers easy adjustments for driving in wood, plastic, steel, and aluminum. View larger. |
 Kit includes high-quality flashlight, battery charger, and seven-piece bit set. View larger. |
The DS12DVF3 Driver Drill offers class-leading maximum torque of 230 in/lbs, so you can power through wood up to one inch thick. And two-speed transmission is controlled by a one-touch speed knob that lets you choose the right setting for your job--either 0-350 RPM or 0-1,050 RPM.
Also, a 22-stage clutch offers easy adjustments for high torque and precision driving in wood, plastic, steel, and aluminum. And with tool-less clutch adjustment, this drill handles precision fasteners, such as drywall screws, without damaging walls.
Compact, Ergonomic Design for Easy Handling
The DS12DVF3 has all the power you need and is still lightweight and compact enough to provide superior handling. At just 7-3/4 inches in length and weighing just 3.3 pounds, this tool reduces user fatigue and can be used on a ladder or in tight spaces where larger cordless drills can't reach. An added bonus, a non-slip elastomer grip provides comfort and safety.
Adding to this drill's easy-handling features is a 3/8-inch keyless chuck that allows for easy bit changes, as well as a patented five-position belt hook--with two bit holders--that saves time and adds convenience.
Everything You Need in One Package
The DS12DVF3 Kit includes more than just the cordless driver drill. It also includes a high-quality flashlight and a seven-piece bit set to get you started immediately. For further convenience, a protective carrying case stores it all for easy portability from job to job.
Long-Lasting NiCD Batteries Charge in 30 Minutes
The DS12DF3 kit's driver drill and flashlight run on 1.4-Ah nickel cadmium (NiCD) batteries (included), which offer longer runtimes and fewer charges than traditional batteries.
The kit's quick charger fully charges the batteries in just 30 minutes, and you can expect about 300 charges over the life of each battery. An added bonus, the charger is compatible with other Hitachi tools that use NiCD rechargeable batteries (up to 18 volts).
The Hitachi DS12DVF3 Driver Drill Kit with Flashlight is backed by a five-year warranty.
What's in the Box
DS12DVF3 Driver Drill, driver bit, seven-piece bit set, flashlight, two 1.4-Ah batteries, quick charger, and carrying case.
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Limited Offer Today!! Hitachi DS12DVF3 12-Volt Ni-Cad 3/8-Inch Cordless Drill/Driver Kit Black Friday and Cyber Monday Deals
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