Renewable-energy water supply – with a backup

GRUNDFOS SQFLEX BATTERY BACKUP SYSTEM
Renewable-energy water supply
– with a backup plan
SYSTEM SET-UP AND SIZING
SQFlex Battery Backup Systems
Battery backup systems can be used with an SQFlex pumping system. These systems are typically used in
applications where the pump will not be running during most of the peak sun hours of the day, or where it is
impossible or imprictical to store large volumes of water. Examples include remote homes or cabins, automatic
livestock waterers, and very low-yielding wells.
System Set-up
The system will be wired as shown in the accompanying diagram.
• Power will be provided by the calculated number of solar panels wired to produce 48 VDC (nominal)
• Power from the solar panels will feed into a 48 VDC charge controller, which will regulate the current
fed to the batteries
• From the charge controller, power passes into the battery bank, which consists of the number of
appropriately sized batteries, wired in series to achieve 48 VDC (nominal) output
• Power is drawn from the battery bank and routed through an SQFlex control box (IO 100/101, or CU 200)
• Power is run from the control box to the SQFlex pump
For domestic water supply applications
The CU200 pump control box should be selected, since it includes terminals for a pressure switch, which will
control the pump’s on/off operation via the pressure in the storage tank. The pressure switch should be of a
normally-open configuration, where the contacts within the switch are in the open position when the pressure
is below the maximum set-point. When the pressure in the system rises to the maximum desired pressure, the
contacts will close, signaling the pump to shut off.
Battery Backup System Diagram
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Performance range:
System pressure:
Inlet pressure:
Suction lift:
Liquid temperature:
Ambient temperature:
Nominal voltage range:
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Weight:
Dimensions:
Thermal protection
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Flow up to 20 gpm
Head up to 139 ft
Up to 109 psi
Max. 45 psi
Max. 26 ft
32°F to +95°F
32°F to +113°F
1 x 110 - 120 V or
1 x 220 - 240 V
29 pounds
12.6 x 22.4 x 8.7 (in)
Yes
> Charge Controller
Morning Star PS15M-48V Charge Controller includes
connections for solar input, battery output, and load
output to the CU 200 and SQFlex
> Battery Bank
Batteries used should be marine or other type of
deep-cycle battery
Sizing guidelines are provided for the pump, solar panels, and battery bank.
Follow the given instructions to size your system.
Selecting the Pump Model
1.
2.
3.
Calculate the total dynamic head (TDH) of the system as you would for a normal water supply application
Determine the required flow rate
(Refer to Chart A). Locate your calculated total dynamic head in the “Head” column on the left. Follow
the chart to the right and select the pump model which provides the desired flow rate at that head.
Sizing the Solar Array
1.
Enter the number of run-time hours per day (for normal household use, enter 2)
2.
Multiply by 8.4 for maximum pump current draw and battery losses
3.
Enter average sun hours per day in your area (from chart B)
4.
Divide line 2 by line 3 to get total solar amps required
5.
Enter peak amp rating of solar panel (2.07 for GF65C)
6.
Divide line 4 by line 5
7.
Round up to next higher whole number
8.
Enter number of panels in series needed to achieve 48 VDC (2 for GF65C)
9.
Multiply line 7 by line 8. This is the total number of solar panels required
x 8.4
=
=
=
=
=
Sizing the Battery Bank
1.
Enter the result from line 2 above
2.
Enter number of consecutive days without solar power you need
3.
Multiply line 1 by line 2
4.
Multiply by 2 for allowable depth of battery discharge
5.
Determine lowest temperature batteries will be exposed to during use
Enter temperature correction factor (from chart C)
6.
Multiply line 4 by line 5. This is the total battery capacity in Amp-hours for each battery required
7.
The total number of batteries required is equal to 48V divided by the voltage output of each battery
(4 for 12 VDC battery)
=
x2
=
=
Being responsible is our foundation
Thinking ahead makes it possible
Innovation is the essence
Chart A
Head (ft)
Chart B
Flow (gpm)
3 SQF-2 6 SQF-2 11 SQF-2
20
40
60
80
100
120
140
160
180
200
220
240
260
280
300
320
340
360
380
400
2.4
2.4
2.4
2.4
2.4
2.4
2.4
2.4
2.4
2.4
2.3
2.3
2.3
2.3
2.3
2.3
2.3
2.2
2.2
2.2
5
5
5
5
4.8
4.8
4.8
4.6
4.4
4
3.8
3.4
3.2
3
2.8
2.6
2.4
2.2
2
1.8
11
11
10.5
10
8.5
7
6
5
4.5
3.5
2.5
2
1.5
0.5
0
0
0
0
0
0
Chart C
Temperature
Correction Factor
80 F
70 F
60 F
50 F
40 F
30 F
20 F
1.00
1.04
1.11
1.19
1.30
1.40
1.59
State
AK
AK
AL
AR
AZ
AZ
CA
CA
CA
CA
CA
CO
CO
DC
FL
FL
FL
GA
HI
IA
ID
ID
IL
IN
KS
KS
KY
LA
LA
LA
MA
ME
ME
MI
MI
MN
MO
MO
MS
City
Average sun hours/day
Average
State
Fairbanks
Anchorage
Montgomery
Little Rock
Tucson
Phoenix
Santa Maria
Sacramento
Fresno
Los Angeles
San Diego
Grand Lake
Grand Junction
Washington
Miami
Gainesville
Tampa
Atlanta
Honolulu
Ames
Boise
Twin Falls
Chicago
Indianapolis
Manhattan
Dodge City
Lexington
Lake Charles
New Orleans
Shreveport
Boston
Caribou
Portland
Sault Ste Marie
Lansing
St. Cloud
Columbia
St. Louis
Meridian
3.99
3.55
4.23
4.69
6.57
6.58
5.94
5.1
5.38
5.62
4.77
5.08
5.85
4.23
5.62
5.27
5.67
4.74
6.02
4.4
4.92
4.7
3.14
4.21
4.57
5.79
4.94
4.93
4.92
4.63
3.84
4.19
4.51
4.2
4
4.53
4.73
4.38
4.43
www.grundfos.com
Canada
Grundfos Canada, Inc.
2941 Brighton Rd.
Oakville, Ontario L6H 6C9
Telephone: (905) 829-9533
Fax: (905) 829-9512
City
Glasgow
Great Falls
Albuquerque
Lincoln
Omaha
Cape Hatteras
Greensboro
Bismark
Sea Brook
Las Vegas
Ely
Binghampton
Schenectady
Rochester
Columbus
Cleveland
Stillwater
Oklahoma City
Corvallis
Medford
Pittsburg
Newport
Charleston
Rapid City
Nashville
Oak Ridge
San Antonio
Brownsville
El Paso
Midland
Fort Worth
Salt Lake City
Richmond
Seattle
Richland
Spokane
Madison
Charleston
Lander
Average
5.15
4.93
6.77
4.79
4.9
5.31
4.71
5.01
4.21
6.41
5.98
3.16
3.55
3.31
4.15
3.94
4.99
5.59
4.03
4.51
3.28
4.23
5.06
5.23
4.45
4.37
5.3
4.92
6.72
5.83
5.43
5.26
4.13
3.57
4.44
4.48
4.29
3.65
6.06
Chart B (Canada Locations)
Province
City
Average
Province
City
Average
AB
AB
BC
BC
BC
MB
MB
NB
NL
NL
Edmonton
Suffield
Kamloops
Prince George
Vancouver
The Pas
Winnipeg
Fredericton
Goose Bay
St. Johns
3.75
4.10
3.29
3.14
3.14
3.56
4.02
3.56
3.33
3.15
NT
NT
NS
ON
ON
PE
QC
QC
SK
YT
Fort Smith
Norman Wells
Halifax
Ottawa
Toronto
Charlottetown
Montreal
Sept-Isles
Swift Current
Whitehorse
3.29
2.89
3.38
3.70
3.44
3.56
3.50
3.50
4.23
3.10
L-SQ-SL-021
Rev. 7/05
PRINTED IN USA
U.S.A.
Grundfos Pumps Corporation
17100 W. 118th Terrace
Olathe, Kansas 66061
Telephone: (913) 227-3400
Fax: (913) 227-3500
MT
MT
NM
NE
NE
NC
NC
ND
NJ
NV
NV
NY
NY
NY
OH
OH
OK
OK
OR
OR
PA
RI
SC
SD
TN
TN
TX
TX
TX
TX
TX
UT
VA
WA
WA
WA
WI
WV
WY
Mexico
Bombas Grundfos de Mexico, S.A. de C.V.
Boulevard TLC #15
Parque Industrial Stiva Aeropuerto
C.P. 66600 Apodaca, N.L. Mexico
Telephone: 011-52-81-8144-4000
Fax: 011-52-81-8144-4010