Basement Watchdog Big Dog Computer-Controlled AC/DC Battery Backup Sump Pump System-BWD12-120C at The Home Depot

Basement Watchdog

Model # BWD12-120C

Internet # 100065446

Store SKU # 130781

Big Dog Computer-Controlled AC/DC Battery Backup Sump Pump System

Basement Watchdog Big Dog Computer-Controlled AC/DC Battery Backup Sump Pump System

This item has been discontinued.
The Home Depot no longer carries this specific product.

$497.00 / each


Model # BWD12-120C

Internet # 100065446

Store SKU # 130781

Store SO SKU # 1000895759

The powerful Basement Watchdog Big Dog Computer-Controlled AC/DC Battery Backup Sump Pump System pumps 3,500 GPH at 0 ft. of lift or 2,200 GPH at 10 ft. of lift. This convenient pump fits next to the main AC pump and automatically begins pumping during power outages when the main pump fails or when water flow exceeds the capacity of the main pump. This reliable sump pump system features a 20 Amp charger that recharges the battery quickly and runs the pump with AC current instead of the battery if the power is on.

  • Pumps 2,200 gph at 10 ft. Lift and 3,500 gph at 0 ft. Lift
  • User-friendly control panel lights up with a warning and describes what to do for easy maintenance
  • A sensor monitors battery fluid levels for increased piece of mind
  • Runs pump once per week to ensure operation and backup pump will run directly on a/c power if available
  • Corrosion-resistant thermoplastic housing
  • Includes a dual float switch for added protection
  • Includes powerful 20 amp charger that recharges the battery quickly and shuts off completely to prolong battery life
  • Backup pump will run directly on ac power if available
  • Increase the run time by connecting two 7.5 Hour Batteries (30HDC140S) using the Basement Watchdog Parallel Jumper Cable (PJC – Available online). Additional acid pack (Z-Pack) required

Info & Guides

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Amperage (amps)  10  Assembled Depth (in.)  10.9 in 
Assembled Height (in.)  8.25 in  Assembled Width (in.)  8.75 in 
Batteries Included  No  Battery Life (hours)  7.5 h 
Battery Type Required  30HDC140S - 7.5 Hour Basement Watchdog Deep Cycle Battery  Certifications and Listings  SSPMA Certified 
Discharge Flow @ 0 ft. (gallons/hour)  3500  Housing Material  Thermoplastic 
Manufacturer Warranty  2 Years  Number of Batteries Required 
Product Depth (in.)  Product Weight (lb.)  5 lb 
Returnable  90-Day  Voltage (volts)  12 


Rated 4.1 out of 5 by 29 reviewers.
Rated 5 out of 5 by Saved my basement many times This was the second system I have purchased and it has earned it's keep several times over. I live on 2 1/2 acres that are surrounded by wetlands. I have drain tile around the inside of my foudation so my sump pumps fill and drain about every 3 mins 24/7. So when the power goes out, which it has I can flood my basement 4" deep in 45mins. best thing I ever bought for the house besides the drain tile. Alarm goes off to tell me when the power goes off or there's a problem with the main pump. Only 1 problem. DON'T wait for the low water sensor to tell you when to fill with water. Do it once a year, trust me. I waited and we had a tornado that knocked out power for 4 days. Smoked the battery. Other than that, you can't go wrong. I own 2 systems. Well worth it. June 29, 2011
Rated 5 out of 5 by A Great Buy but..... EVERYONE READING THIS.... make sure you UNDERSTAND THAT THIS DOES NOT COME WITH A BATTERY OR ACID. I wish Glentronics would simply package the battery with this. Its sort of dumb.... you need a battery since the system will not work w/o it. Yet they sell it seperate. I ended up using a marine battery from my boat until I got time again to go to home depot to pickup the Glentronics / Watchdog battery. (Another $100). This is a great system. I have put it in unfortunately after the fact. Will the lesser models work.... yeah I imagine they would but when I saw the water pouring in over the sump pump cover after the power went out, it was scary to see how much water was coming in. Within 2 - 5 minutes, our basement (approx 2000+/- sq ft) was covered in about 2" of water. Soooo that being the case, I opted for the most GPH pump. I was thinking about putting in a generator but decided on this for the interim. This unit also gives you more information feedback than the other 2 lesser models. It also tells you how much more battery life is left. October 3, 2006
Rated 5 out of 5 by A must have for basements with sump pits This product has saved my basements on several occasions. The system has a powerful pump, charger, several monitoring features and easy to follow step by step instructions on how to install and troubleshoot the system. The company also has outstanding customer service. I used two 7.5 hour Watchdog batteries (in parallel) for each system which provides days pumping capacity. You would need a parallel jumper cable which I bought from the manufacturer. One piece of advice…although the system monitors the battery fluid levels, which works very well, I like to check mine when I turn the clocks back or just before going on vacation. Overall great product!!! December 30, 2009
Rated 5 out of 5 by BONUS--it's compatible with an AGM battery DItto other Excellent reviews. The only thing I'm adding is the fact that the electronics on the Big Dog model (as well as the inexpensive BWE ) are fully compatible with an Absorbed Glass Mat (AGM) battery according to Tech Support. Why is that important? Because, AGM batteries don't produce hydrogen gas when they charge--so pilot lights and other ignition sources in the basement pose no problems! They won't leak or spill even if they're broken, they survive most freezes, and warranties are twice as long as a lead -acid design. (I am NOT an advertiser--just a very happy camper) April 14, 2010
Rated 3 out of 5 by Deceptive description Describing this product as an AC/DC battery system is not accurate since the battery and acid to power the system is not included in this kit. I spent an additional $125 for a battery and $25 for acid to put in the battery. There is a censor that needs to be installed and the electrical path so the battery only runs when the home power is off can be confusing. I had a plumber install this system ($125) including adding the acid to the battery just to be sure it was installed correctly. I live on the waterfront and need a dependable pump for daily use. This is the 2nd system I've had to install in 11 years. August 5, 2014
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