Model # BWD12-120C

Internet #100065446

Store SKU #130781

Store SO SKU #1000895759

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

Basement Watchdog

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

$497.00 /each

Frequently Bought Together

Product Overview

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
  • Click here for more information on Electronic Recycling Programs

Info & Guides

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Warranty / Certifications

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Customer Questions & Answers

is battery included with this system?

Asked by: newhome
This is incorrect this system does not include battery or acid. The system comes with the controller and pump. The box is included for the battery but the actual battery does need to be purchased separately. Please contact us directly at 800.991.0466 ext 3 for customer support if you are in need of further assistance
Answered by: Glentronics
Date published: 2016-06-20

Can I purchased the battery only for the Watch big Dog unit , what model is it ?

I just need a replacement battery.
Asked by: mikeeg
The correct battery for the "Big Dog" system is the Basement Watchdog 7.5 hour standby battery. The model number for that one is 30HDC140S. Be sure to purchase the box of battery acid that goes with it. Usually the boxes of battery acid our sold in stores right next to the batteries themselves. If your local store doesn't have the acid in stock you would need 6 quarts of 1.265 specific gravity battery acid.
Answered by: Glentronics
Date published: 2016-10-04

how long does a good battery last

Asked by: admiral
First one lasted 14 years
Answered by: Bones
Date published: 2017-04-05

If all battery cells have water , why would the alarm still be going off? We have tried to reset the alarm without succ.

Asked by: Betty
There are many different reasons for the system to alarm. Even though all of the battery cells are full, there may be another problem, which would be identified by a red warning light. I would recommend contacting our customer support team so we can help you figure this out at 800-991-0466, option 3. We are available to take incoming calls from 9am - 5pm CT Monday through Friday.
Answered by: Glentronics
Date published: 2017-03-01
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Customer Reviews

Big Dog Computer-Controlled AC/DC Battery Backup Sump Pump System is rated 3.9 out of 5 by 34.
Rated 5 out of 5 by from Purchased this unit in 2001. The only thing we've replaced in 16+ years was the battery. Once. We... Purchased this unit in 2001. The only thing we've replaced in 16+ years was the battery. Once. We use this unit as it is intended for. A backup in case the power goes out. We have two sump pumps and this is a secondary pump. We have lost power many times and have faith in this unit.
Date published: 2017-01-10
Rated 4 out of 5 by from I bought one about 10 years ago and the control module went out. Had to buy a whole new unit whic... I bought one about 10 years ago and the control module went out. Had to buy a whole new unit which is not good you would think they would have parts available.
Date published: 2017-03-28
Rated 5 out of 5 by from 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!!!
Date published: 2009-12-30
Rated 5 out of 5 by from 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.
Date published: 2011-06-29
Rated 5 out of 5 by from 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.
Date published: 2006-10-03
Rated 5 out of 5 by from 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)
Date published: 2010-04-14
Rated 5 out of 5 by from I bought the Watch Dog battery back up system last summer after installing drain tile in my constantly wet basement. My sump pump now runs 24/7/365. We had so many power outages last summer that I flooded the basement several times. I purchased the Watch Dog system and have been dry for the first time since moving here 9 years ago. It has saved me from bailing water from the pump well to renting a generator numerous times. Last week the main pump failed and it was 3 days before someone could come and replace it. The Watch Dog took over, running on A/C electrical from the house and when the company came to replace the main pump he told me with the amount of water we have it's a good thing I bought that system. Awesome Product!!
Date published: 2009-04-11
Rated 1 out of 5 by from Unit quit working after 1 year and manufacturer refused to warranty it. I spent over $500 for the big dog system and the company would not warranty it because it was coming up as an older serial number. Apparently you need to check the number of the unit you buy. Bad customer service.
Date published: 2016-01-19
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