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12 / 24 Volt AC or DC photo eye

12 volt AC-DC photocell 12 Volt AC/DC photocell/ coil rated for 12 volt DC
10 amp
Buy::
12 V DC-AC photocell at Amazon
12 V DC mighty mule photo eye
All 12 VDC photocells
12 Volt DC products at Amazon


12 volt AC-DC photocell 12 Volt DC photocell for 12 VDC car battery

Buy::
12 V DC photocell at Amazon
All 12 VDC photocells
12 Volt DC products at Amazon

Resource:
Reverse photocell so it turns off at night and on at day
ST01C           
          Larger image             

CR2 battery  ST01 uses CR2 battery
6-12-24 volt photo eye
ST01/ battery-operated/ dawn-to-dusk or dusk-to-dawn/ astronomic or programmable timer/ works with 12-28 Volt AC or DC/ requires no power to operate timer except internal CR2 battery

Use dawn-dusk programming.
Connect 12V DC to Black and Blue wires

To reverse operation so load is ON during the day... connect blue and red wires together

ST01 and Ei600 timers are battery operated
These timers do NOT require connection to 120 Volt power
Free standing timer, replaceable CR2 battery
DC Loads 4A 12V dc, 2A 28V dc
Buy:
Intermatic ST01c timer at Amazon/ 1 year warranty
Intermatic ST01 timer
Ei600 5-year warranty timer at Amazon
CR2 replacement battery at Amazon


Resources:
Load ratings for Intermatic timers/ pdf
Load rating for ST01 timer: 120V ac, 6A, 208-277V ac; DC Loads 4A 12V dc, 2A 28V dc; Motors 1HP 120VAC, 2HP
240V ac, Ballast 16A 120V ac, 208-277V ac; Resistive 20A 120-277Vac.
ST01 timer
Red-Blue-Black-green wires
LED display is not illuminated
Why is this timer a photo eye?
Because it can operate dawn-to-dusk or dusk-to-dawn.
The timer automatically adjusts for time zone. The dawn dusk setting can be adjusted slightly longer or shorter.
The timer can be connected to delay timer to turn off earlier than dusk or dawn
Choose dawn-to-dusk by connecting blue and red wire together.
Choose dusk-to-dawn by capping red wire
Why is this timer 12 Volt DC
Because the timer is battery-operated. Battery lasts 2-3 years.
Because the timer does not need to be connected to 120 Volt AC or 240 Volt AC power to operate. Just the battery is needed
Timer can be located inside electric box, anywhere outdoors-or-indoors. Can be located in shaded or dark location without affecting operation.
ST01 timer is rated DC Loads 4A 12V dc, 2A 28V dc
Resources:
How to program and wire ST01 timer
solar water heater
Larger image
ST01 timer controls PV solar panels
Concept illustration.
Not tested as drawn with solar panels.
Following information about ST01 timer is tested:
ST01 timer is rated 4A 12V dc, 2A 28V dc
Install 2 amp fuse as shown
When ST01 timer red-and-blue wires are connected, then programming is reversed. Dusk-to-Dawn become Dawn-to-Dusk
Buy:
DC-DC heavy amp relay with 12-24 Volt DC coil, contacts rated 250 VDC 26 amp
DC-DC heavy amp relay with 12-24 Volt DC coil, contacts rated 400 VDC 200 amp
Intermatic ST01c timer at Amazon
ST01C
Larger image
LCD display is not lighted

Intermatic ST01C buttons
All Intermatic timers
ST01C  7-day/ battery operated no neutral required / single-pole or 3-way
Ei600  / same as ST01 except 5 yr warranty instead of 1 yr warranty

/astronomic or programmable/  single-pole 3-way/ 1 yr warranty/ No neutral/ uses CR2 battery
Programmable or Astronomic dawn-dusk/ 6 ON and 6 OFF settings per 7-day week
Incandescent, CFL, LED, motors, ballast, DC loads/ AC and DC loads 24V up to 277Volt.
Permanent override/ No loss of memory in power outage or battery change

Buy:
Intermatic ST01c timer at Amazon
Intermatic ST01 timer
Ei600 5-year warranty timer at Amazon
CR2 replacement battery at Amazon
CFL bulbs at Amazon
Manuals/ resources:
ST01C manual
Sell sheet with model numbers
Ei600 manual
Sell sheet with model numbers
How to program ST01c and Ei600 timers
How to wire ST01C and Ei600 timer diagrams
Control any 240volt load with ST01c or Ei600 timer
How to wire this tim
er to control water heater or any heavy-amp load

Buy:
12 Volt DC products at Amazon
12 volt DC power supply12 volt DC power supply 12 volt DC power supply
60 watt
120 volt AC to 12 volt DC

Buy::
12 V DC 60 watt power supply
12V DC 10A power supply
All 12 volt DC power supplies


To wire this as a photoeye, connect ordinary 120 volt AC photoeye to the electric cord going to power supply.

Buy::
120 volt Photo eyes


12 Volt DC photoeye
12 volt DC photoeye
Buy::
12 volt DC photoeye
solar water heater
Larger image
Use DC timer to control solar water heater
How it works:
When water inside tank is cold, then lower thermostat turns ON
12-24 Volt power supply provides electricity to lower thermostat
Thermostat turns ON, then DC relay turns ON, letting solar power flow to lower element.
At same time, power is sent to ST01 timer, waiting for timer programs to activate
ST01 is battery powered, and keeps time and will operate relays even is 12-24 VDC does not arrive from lower thermostat.
With this specific illustration, the lower thermostat must be ON before 12-24 VDC travels to ST01 timer
When timer is ON, and lower thermostat is ON, then timer turns ON upper element

When solar power is not full strength, then you want to activate lower watt, higher-resistance element to maximize solar output.
In this illustration, the lower watt element is the upper element on water heater
Set timer so it is ON from 6 AM to 10 AM
Set timer so it is OFF from 10 AM to 3 PM
Set timer so it is ON from 3 PM to 9 PM

Resources:
Convert AC water heater to DC water heater


Multimeter
Test for breaks in wire/ Test for voltage
Most appliance require 80% rated voltage to function correctly
Buy:
Multimeters at Amazon
Electric testers at Amazon 
Resources:
How to test and replace element
How to test thermocouple
Element tests for 120 volts
How to test wire
Safety when testing wires:
Never touch wet or previously flooded appliance.
Never stand on wet surface when working on electric.
Never stand on bare soil, put down dry boards.
Tape tester leads to wood sticks to keep hands away from power.
Use non-contact voltage tester before touching wires.
Never touch or lean into any made of metal.
Remove metal objects from pockets.
Do not use oxygen or fuel accelerants in same room as electrcial repairs

Resources:
Basic house wiring

Non-contact voltage tester
Test for power without touching connectorss
NEVER assume power is OFF
Buy:
Non-contact voltage tester Amazon
Electric testers at Amazon
 
Resources:
How to test electric power is off
wire connector assortment
Twist-on wire connector assortments
Do not reuse old connectors 
Buy:
Connector assortment at Amazon
Connector assortment at Amazon

Resource
How to select and install twist-on wire connectors
Weatherproof wire connector
Weatherproof wire connector
Connector cavity is full of silicone
Built-in cover keeps silicone in place
Protect from water, dust etc
Buy: from my affiliate links
Weatherproof size 14 to 6 Amazon
Weatherproof size 22 to 8 Amazon

Resource
How to select and install twist-on wire connectors
Wire connector wrench
Wrench to apply wire connectors
Tighten connector 
Buy:
Wire connector blaster
Twist connector wrenches at Amazon

Resources:
How to twist wire
How to select and install twist-on wire connectors

linesman pliers
Buy: tools:
Wire strippers at Amazon
Linesman pliers
Utility knife at Amazon
End cutting nippers at Amazon

Fire inside timer caused by stranded wire
Keep enclosure door closed at all times
Push on wire connectors
Push-on wire connectors in place of twist-on connectors
Buy:
Push on wire connectors Amazon
Red 3P connector for 10-14 gauge wire
Lever connectors for stranded wire at Amazon

Resources:
How to install terminals
Treminals
Terminals
Buy:
Terminal kit
Blue for 16-14 wire
Yellow for 12-10 wire
Read about terminals

Orange 10 gauge 30 amp


Orange/ #10 gauge for for 30 amp circuits including water heater
with ground
Buy:
10-2 gauge/ 30 amp
10-3/ 30 amp

NMB is house wiring
UF is underground

Yellow 12 gauge 20 amp


Yellow/ #12 gauge wire for 20 amp
with ground
Buy:
12-2 gauge/ 20 amp
12-3/ 20 amp

Rolls of stranded wire

NMB is house wiring
UF is underground
White 14 gauge 15 amp


White/ #14 gauge wire for 15 amp
with ground
Buy:
14-2 gauge/ 15 amp
14-3/ 15 amp

NMB is house wiring
UF is underground

Copper ground wire
Use same size as other wire in circuit

Buy:
Spools of ground wire
Ground rods at Amazon
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Buy: water heaters  from my associate links:
50 gallon Gas water heaters at Amazon
40 gallon gas water heaters at Amazon
50 gallon Electric water heaters at Amazon
40 gallon electric water heaters at Amazon
Hybrid / heat pump/ water heaters at Amazon

Resources:
How to install gas water heater
How to install electric water heater
Troubleshoot gas water heater
Troubleshoot electric water heater
Point of use water heaters
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box timers Compare box timers

Control water heater w/ Z-wave
Intermatic control centers Control centers:
+ manuals and parts


All control centers and parts

Including Z-wave
Resource:
Compare programmable timers
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Delay timers
Modules

Din rail
Twin
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Resources:
Replace element
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Troubleshoot electric water heater
Remove old element
Marathon elements
Figure volts amps watts
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