Surefire Stove Sentry SF 512, Battery Backup

Item #: SF512

The Surefire Stove Sentry interfaces between a pellet stove or kerosene heater and the AC electrical supply.

When electricity is present the Surefire Stove Sentry charges a battery and surveys the power line. At the instant that a power failure occurs, the Surefire Stove Sentry converts the energy stored in the battery to AC power. This assures operation of the pellet stove or kerosene heater without interruption during the absence of electricity.

When AC utility power is restored, the Surefire Stove Sentry reinstates AC utility power as the prime energy source to operate the pellet stove or kerosene heater. Simultaneously and automatically the Surefire Stove Sentry commences the recharging of the battery, to return it to full capacity in preparation for the next power failure.

At sites where utility power is not present, the user should determine if there is a sufficient reserve of battery capacity to enable the pellet stove or kerosene heater to operate for the desired time period. Consult the Surefire Stove Sentry operating manual for data relating the size and number of batteries needed.

Figure 1 illustrates the interconnections between the pellet stove or kerosene heater, Surefire Stove Sentry and battery.

In the absence of electricity, Pump Sentry will convert power from a deep cycle marine battery of 180 minutes reserve capacity, to operate a 1/3 horsepower sump pump. Under typical duty cycle conditions such operation can be maintained for approximately two days. If more time is desired, a larger battery or multiple batteries can be used

Electrical Specifications
Input Voltage Range : 100-128 VAC
Input Current: 5.5A
Charging Current (max): 12A  
Recharge Time (max): 13 Hrs

Backup Mode Operation
Maximum Back Up Power: 550 Watts
Maximum Input Current: 55 A
Factory Warranty: 1 year

Size: (inches) 12H x 7W x 3L
Weight: 12lbs
 

More backup operating time can be realized through the use of multiple batteries connected in parrallel. Such a connection is illustrated in figure 2.
Here's How Pump Sentry Works

Pump Sentry interfaces between a pump and the AC electrical supply.

When electricity is available, Pump Sentry charges a battery and monitors the power line to detect a power outage. At the instant that power failure occurs, Pump Sentry draws the energy stored in the battery and converts it to AC power. This AC power is automatically channeled to the pump to maintain its operation in the absence of electricity.

When AC utility power is restored, the Pump Sentry reinstates AC utility power as the prime energy source to operate the pump. Simultaneously and automatically Pump Sentry commences the recharging of the battery, to return it to full capacity in preparation for the next power failure.

Figure 1 shows how easily Pump Sentry can be installed.

 

In the absence of electricity, Pump Sentry will convert power from a deep cycle marine battery of 180 minutes reserve capacity, to operate a 1/3 horsepower sump pump. Under typical duty cycle conditions such operation can be maintained for approximately two days. If more time is desired, a larger battery or multiple batteries can be used (see Figure 2). The operating time is directly proportional to the battery capacity.

 

 
Two Pump Sentry Models from which to Choose

 
Electrical Specifications
Model 812 PS
Model 1612 PS
Normal Mode Operation:
 
 
Input Voltage:
100-128 VAC
100-128 VAC
Input/Output Current (max.)
11 A Continuous
16 A Continuous
On Motor Start Up
15 A Peak
22 A Peak
Max. Battery Charging Current
12 A
 
12 A
Max. Recharge Time
13 Hrs.
13 Hrs.
(For recharging a 180 minute reserve battery that has been depleted to 10.5 Vdc)

 
 
Back Up Mode Operation:

 
Maximum Back Up Power
1200 Watts Cont.
1600 Watts Cont.
Maximum Input Current
120 A Cont.
180 A Cont.
Size: (inches)
3H x 8W x 17L
3H x 8W x 21L
Model 812 PS will operate most pumps whose continuous current draw does not exceed 11 A.

Model 1612 PS will operate most pump combinations whose continuous current draw does not exceed 16 A.

Pump Sentry Selector Guide**

 
Manufacturer
Pump Model
812 PS
1612 PS
Submersible Types
 
 
 
Hydromatic
SD 25A
X
X
Jacuzzi
3SPP
X
X
Stevens
SS45F
X
X
Zoeller
M 53
X
X
Tecumseh
T157
X
X
Column Types
Any Brand  
X
X
**Models other than those listed above may operate properly with Pump Sentry



 
How to Calculate Operating Time During Power Outage

Operating time will depend on the following:

a) The size of the battery bank i.e. its total Ampere-Hour (A-hr) capacity.
Ampere-Hour capacity is calculated by adding the A-hr ratings of all the batteries in the battery bank where the batteries are connected in parallel.
(For Parallel Connection See Fig. #2)

b) The current draw for the pump in Amps (C).
This can be read off the nameplate on the sump pump

c) The average operating duty cycle of the system
The duty cycle of a system is the ratio of its "on" time to its "on" time plus "off" time e.g. if a pump will work for 10 seconds and is then off for two minutes (120 seconds) its duty cycle is calculated as follows:

 
Duty cycle = 10/(10+120) = 0.077
 

Once (a) (b) and (c) are known the operating time of a pump sentry in hours can be calculated by the formula:

 
T= A - hr/(C x 10 x D)
 

e.g. for a system with 1 battery rated 90 A-hr.
1) 1 battery rated 90 A-hr., A-hr = 1 x 90
2) A sump pump that draws 9 Amps, C=9
3) Duty cycle which operates 10 seconds "on" followed by 3 minutes (180 seconds) "off", D = 10/(10 +180) = 0.053

 
T (Hours) = (1 x 90)/(9 x 10 x 0.053) = 19
 

In 10 seconds the average 1/3 hp. sump pump will evacuate approximately 10 gallons of water.


 
Features and Benefits of Pump Sentry

 

Operates with existing equipment translates into;
- optimum performance
- does not impose the introduction of an additional pump

Not restrictive to a single brand or pump style

Easy Hook Up
(No special tools or wiring necessary, plugs into standard wall outlet)

Automatic Power Transfer
(You do not have to be present to make it work)

Automatic Recharge
(You do not need to remember to recharge the battery)
(You do not need an additional battery charger)


Silent and Clean Operation
(Can be kept in home basement or utility room)

Enables the combination of column and submersible pumps without special additions
(No check valves or switches)

Maintenance Free Operation
(Needs no fuel, has no moving parts)

Comprehensive Instruction Manual and Factory Support
(Unconditional 1 Year Warranty on Pump Sentry only)
(No warranty is implied for misapplication - see instruction manual for correct usage)



 
A Comparison with Competitor's Specifications
 
 
812 PS Pump Sentry in System
12 VDC Auxiliary Systems
Pumping Capacity
(gal/hr. @ 10 ft.)
Up to 3000 gal./hr. with 1/3 HP AC Pump
768 - 1600 gal./hr.
(varies with brand)
Pumping time Flexibility
Multiple batteries may be connected in parallel to increase pumping time capacity
(see Figure 2 above)
Unspecified
Charger Capacity
13A
0.4A to 10 A
(varies with brand)
Recharge Time
10 Hours when using a single 90 A-hr Battery
10 Hours to 170 Hours with recommended battery
(varies with brand)