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DC relays for solar panels |
  250VDC 25 amp 400VDC 200 amp These are the big boys Connect big volts and amps to the contacts Operate the coil using 12-24 Volt DC |
DC
to DC relay/ mechanical type
240 Volt DC power relay /26 amp to 200 amp DC Full on-off contacts/ 12 or 24 volt DC coil 250 volt / 25 amp DC load 250V x 25 amp = 6250 watt Connect 12 or 24 volt DC to terminals 3-4; Connect load to terminals 1-2 Buy: Electromechanical DC-DC G9EB-1 relay G9EB-1-B-DC24 24 VDC coil and 400 VDC/ 200 amp contacts Omron relay at online Fuseholder Resources: Omron-DC-DC-relay-Datasheet Omron DC-DC pdf DC power relay spec sheet Convert AC water heater to DC water heater |
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says Normal power relays burn up when they are fed DC power instead of the AC power they are rated at. Relays can be delicate.: I had an issue with relays in my controller box getting destroyed when I switched elements between 240VAC and 120VAC. I solved the issue by turning off the power relay (DPST relay) feeding the 120/240 selection relay (SPDT relay), then flipping 120/240 relay state, then turning the power relay back on. I figured the arc flash between the N and Hot side of the DPST relay was being aided and abetted by the armature moving between contacts while under power. Gene: Blowout relay Magnetic blowout relay |
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 90 mm tall x 50 mm wide/ 25.4 mm per inch 3.5" tall x 1" wide |
Electric
vehicle motor controller/ DC contactor Electric vehicle DC relay Normally closed (normally ON ... must activate to turn OFF) Contacts With blowouts 96 volt max 250 Amp 48 volt max 250 amp Rated 1 million cycles Resource: http://www.schaltbau-gmbh.com/en/Products/Contactors/ AFS series C110B series Specification sheet/ pdf |
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Electric
vehicle motor controller Load contacts: 96 volts DC 200 amp DC 96 volts @ 250 amp http://www.dccontactors.com/Contactors_and_Kits.html http://www.schaltbau-gmbh.com/en/Products/Contactors/ |
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Load
Contacts: 28 volt DC 30 amp DC 9A series W9AS1D52-110/ 30 amp @ 28 volt DC W9AS5D52-110/ 30 amp @ 28 volt DC Online Magnecraft power relays Schneider power relays |
 Coil 12-24 VDC Load contacts 26 VDC 40-50 Amp |
12
Volt DC coil/ power relay
Load Contacts: 28 VDC 40-50 amp DC Buy: 24 volt DC coil/ 40 amp @ 26 VDC 12 volt DC coil/ 40 amp @ 26 VDC 6 volt DC coil/ 40 amp @ 26 VDC 110 volt DC coil/ 40 amp @ 26 VDC W199AX-3 relay W199PX-13/ 50 amp at 26 VDC = 1400 watt X199 Magnecraft relay Magnecraft W199 DC relay Resource: Magnecraft relay / pdf Resource |
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Box
and cover for heavy-duty Magnecraft relay Magnecraft relay with NO NC terminals 120 volt coil or 24 volt coil Buy from my affiliate links Magnecraft 50-1289-1 relay box and cover Resources: How to reverse motor with switch Difference between contactor and relay Relays for DC motors and solar panels Control motor with 2 switches Start two motors at different times |
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DC
relay/ automotive / Input voltage 12 Volt DC
Contacts: 12 Volt DC / 200 amp DC 4 gauge wire Buy: 12 volt 200 amp relay at Amazon Resources: 200 amp DC relay More high amp 12 Volt DC relays |
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24
Volt DC coil
Contacts
90 amp AC/ 3-pole + 1NO/1NC Buy: Dayton 6ECD9 at Amazon |
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DC
relay/ Input 3-28 Volt DC
Contacts: 120 Volt AC / 26 amps Buy: 3-32 volt DC input/ control 120 Volt 25 amp AC Opto relays at Amazon Resources: Solid state relay data sheet Solid state relay DC relay data sheet |
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DC
relay/ Input 3-32 VDC
Contacts 3-phase 25A AC 480 volt Buy: 3-phase solid state relay at Amazon |
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DC200P
5-200 VDC solid state relay
Contacts: 24 VDC 1 amp DC Buy: DC200P 200 volt DC at Amazon Opto relays at Amazon Resources: Solid state relay data sheet Solid state relay DC relay data sheet |
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DC60MP
5-60 VDC solid state relay
Contacts: 24 VDC 3 amp DC Buy: DC60MP 60 volt DC at Amazon Opto relays at Amazon Resources: Solid state relay data sheet Solid state relay DC relay data sheet |
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DC
to DC solid state relays Buy from my associate links 100 volt 25 amp DC Relay 200 volt 25 amp DC relay at Amazon Relay safety cover Heat sink Resource: Convert water heater from AC to DC Electromechanical relay vrs solid state relay/ pdf Switching function solid state relay/ pdf |
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3-pole
contactor wired for DC
loads DC direct current is different than AC alternating current. AC current is a wave that crosses zero volts each time generator rotates 50-60 times per second,. US 60 cycles. Europe Asia 50 cycles. DC current is a straight line. The voltage does not oscillate or vary like AC. Electrons flow through circuit at same voltage at all times. When high voltage AC is turned off, the voltage drops to zero frequently. When AC voltage hits zero, then the arc or spark or heat is easy to extinguish. Result: AC switchgear like contactors last million repetitions without melting the points High voltage DC is different. When high voltage DC is turned off, the electrons keep pushing. Voltage never reaches zero. Result: DC voltage causes arc or spark or heat that is difficult to stop. Basically the electrons keep piling into the contactor. DC switchgear must be rated for DC voltages, and be capable of extinguishing DC arc. Illustration shows one method of extinguishing DC arc using 3-pole contactor. The circuit has 3 parallel switches on the positive wire. With a 4-pole contactor, 3 poles can be used to turn off Positive, and 1 pole to turn off Negative Add resistor in parallel with inductive winding* helps eliminate arcs. *Inductive winding is motor load Buy: 3-pole contactors at Amazon |
 Larger image/ amico timer with dust cover  Dust cover |
CN101
timer/ 12 VDC input
Contacts: 12 VDC 16 amp DC 7 day 17 on-off settings 12-24 Volt DC programmable timer Buy from my associate links: Amico 120 volt 7-day timer 12 Volt/ 16 amp/ DC timer at Amazon CN101 12VDC timer at Amazon 24 Volt/ 16 amp/ DC timer at Amazon Dust cover for Amico timers at Amazon Amico timers at Amazon Transformer: 120-240 Volt to selectable DC voltage Resources: CN101A/ amico timer manual/ pdf with wiring How to wire amico timer Terminals |
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30-60
amp DC safety switches/ fusable Heavy Duty 250 V Dc Voltage; 30 Ampere Buy: Square D 30 amp DC HU361RB Square D 60 amp DC H222AWK Resource: DC safety switches Generic: How to wire safety switch Convert AC water heater to DC water heater DC relays for solar power |
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12
VDC/ 0-3 minute delay timer
Contact rating: 12 VDC 3 amp DC Buy: 12 volt DC relay 12 volt dc relays at Amazon |
 Connect DC directly to water heater |
Photovoltaic
water heater
Electric Solar panel connected to electric water heater If solar panels deliver enough Kw, then the water heater thermostats will melt AC rated elements will work with DC. Ordinary water heater elements will work with DC power Ordinary water heater thermostats will melt with DC power Buy from my associate links: Elements at Amazon DC Element at Amazon Quote: "a photovoltaic water heating (PVWH) system requires neither a battery for energy storage nor an inverter to convert the DC power supplied by the photovoltaic array into an alternating current (AC) power. The DC power supplied by the photovoltaic array is fed to one or more resistive elements that are immersed in a water storage tank." Resource: How to convert AC water heater to DC |
 Question: Is it worth replacing $100-200 contactor or relay each year or two just to make a direct DC water heater vrs converting DC to AC as is typical? Cost analysis not known. Dave says: Omron is cheap relative to the the cost of the solar modules. I think PV direct water heater is still in the game Resource: How to convert AC water heater to DC |
Omron DC-DC relay shown at
top of page is best. 3-pole 90 amp AC with 120 volt coil is next best. ************************** The 48 volt DC 100 amp selling for $100 on Amazon... is same-similar to golf cart DC solenoid and same price. Maybe it will work for diagram on left but not full-blown DC water heater ++++++++++++++++++ Called golf cart guy: Golf cart guy said his 48 volt solenoid will burn out with 96 volts or more. ******************* Golf cart guy says they replace DC solenoids each 5 years on golf cart...each round of golf you turn cart on-off 40-50 times... you play golf 40 times per year ... so we might estimate a DC relay is good for 2000-4000 activations. Can we get same service from 3 pole AC contactor? NO? Can we get same service from Omron DC-DC relay? Spec sheet says Yes ************************** Called auto salvage yard... no such animal as DC solenoid unless yard has hybrid or electric car ... very little demand for electric or hybrid car parts... because repairs are done at dealer.... dealer orders parts from original builder of car who got parts special made for that car. No parts left, no repair. Dealer DC parts would be costly. ****************** The others relays-contactors are too small for direct DC solar water heater ***************** Called DC contactor manufacturer: Salesman very knowledgeable ... They do not sell very many DC contactors... and he laughed .... indicating the demand must be miserable... and he didn't have a price. They do not stock them. They manufacture those contactors to order. They stock the UPS contactor... same rating as golf cart solenoid. Too small for full blown DC water heater *************** Discovered: Manufacturer's can make a DC contactor to exact specification.... salesman can put together a quote for 100 pieces. ****************** Conclusion: If a big company can find profit making DC solar water heater... then the relay will be manufactured, ... and parts available off-the-shelf? Outlook seemed unlikely among folks I spoke with. But history never travels straight line... DC water heater invention is viable if Omron is available and works reliably. |
Multimeter Test for breaks in wire/ Test for voltage Most appliance require 80% rated voltage to function correctly Buy Analog multimeter Multimeters at Amazon Klein multimeter Electric testers at Amazon Clampmeter for testing amp flow on line Resource: 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 electrical repairs Resource: Basic house wiring |
 Non-contact voltage tester Test for power without touching connectors NEVER assume power is OFF Buy: Non-contact voltage tester Amazon Electric testers at Amazon Resource: How to test electric power is off |
 120 volt 15 amp devices
including GFCI, timers, switches, plugs, wifi controls etc can be
installed on 15 or 20
amp
breaker.120 volt GFCI, outlet, receptacle that is rated 20 amp can be installed on 20 amp breaker only, but NOT on 15 amp breaker. Buy 15 amp GFCI 20 amp GFCI  |
Buy Basic electric book Home plumbing/ electrical codes  Or learn about basic household electricity... use and search my site/ Resource Safe electric wiring Basic house wiring |
 Use outlet tester to check for correct wiring on any 120 volt straight-blade outlet. Buy: Klein testers Outlet tester Circuit breaker finder Electric usage monitor |
 Non metallic flexible cables must carry ground wire, but do not have hazard of short circuit causing injury from shock. Armored steel cable can be used as a grounded connection, and will protect wires from damage. Metal can be energized from an insulation failure. All conduit ...metal, plastic ... flexible and rigid ... must be attached to structure, and attached to enclosures, boxes. Movement, damage and deterioration are major cause of electrical failure. Buy: Non-metallic flexible conduit Power whip Armored cable Southwire armored cable cutter Pull boxes |
 Electrical tools must be insulated. Always best to disconnect power, but insulation failure, lack of proper grounding, grounded neutral, lack of GFCI, out-of-code wiring, generator operating without transfer switch, and other problems still pose a risk to anyone working on electric power ... even when breaker is off. Buy: Electrician tools kits KLEIN TOOLS Tools kits IRWIN tools KNIPEX |
Connect wire to screw terminal Use only 600 volt solid copper wire. Do not use stranded wire or extension cord. Do not use solder anywhere on residential 120-240 volt wiring. Attach electric installation to structure. Tighten screws very tight against wire.  Buy: NEC books Dewalt plumbing/ electrical codes Basic electric book National electric code guide/ illustrated Resources: How to twist wire How to select and install twist-on wire connectors |
 Weatherproof
lever switch on outdoor lightsSafely operate outdoor toggle switch Replaces outdoor cover Install over top of ordinary switch Works with single-pole, double-pole, 3PST, 3-way, 4-way switches etc Use weatherproof box for outdoor Can be used indoor or outdoor Buy: Best choice: Cantex lever switch Outdoor lever switches at Amazon Lever switches Resource Cantex-toggle-switch-covers.pdf Cantex-PVC-junction-boxes.pdf |
Buy: |
Push-on wire connectors in place of twist-on connectorsBuy:Push on wire connectors Amazon Red 3P connector for 10-14 gauge wire Lever connectors for stranded wire at Amazon |
 Use nipper instead of pliers or screwdriver for removing staples (and nails). Do not damage cable or wires inside cable. Code -Cable SHALL BE secured without damage to the outer covering. NEC sec. 336-15 Buy End cutting nippers at Amazon |
   When removing insulation from wire, do NOT score or put cuts on surface of copper wire. Doing so increases resistances on wire and creates weak point. Buy tools: Wire strippers at Amazon Linesman pliers Pro linesman plier Needle nose pliers End cutting nippers at Amazon |
 6" Pull box Junction boxes for conduit and wiring Buy: Bud industries 6x6x4 best value/ no KO Raco 6x6x4 metal pull box Wiegman 6x6x4 pull box Hoffman 6x6x4 pull box Adamax raintight enclosure Raintight 6x6x4 box Pull boxes Buy: Pull boxes Polycarbonite boxes Resource: Enclosures and boxes |
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Buy Electronic parts Industrial supplies Tools and home improvement Home and garden Hayward pool Pentair pool Southwire electric |
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Buy
Tools DEWALT Black and Decker Stanley SKIL Makita Porter-Cable Bosch Irwin Hand tools Klein hand tools Fluke electrical testing Dremel hobby tools Campbell Hausfeld air powered Tekton automotive Powerbuilt automotive Saws and saw blades |
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Resource: Compare box timers DPDT timers Intermatic Control water heater w/ Z-wave |
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Resource: Intermatic control centers: and parts Digital control centers and parts Tork control centers and parts Subpanels All control centers and parts Enclosures |
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Resource: Programmable timers Countdown timers Off delay timers On delay timers Timer modules Din rail Twin & one-shot Woods Intermatic Tork |
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Recirculation systems |
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Buy
from my affiliate links every time/ thanks: Amazon Enter Amazon from any link on my site, fill cart with any item ... purchases pay small commission E-mail: geno03245w@gmail.com My response might end up in spam folder, check email folders Waterheatertimer on Twitter Message thru facebook |
