Here is my idea for using a 120v AC hot water heater as a dump load. I am up north in northern canada so we have very cold tempuratures which causes complexities like adding a hot water tank to the mix. { 26 comments… read them below or add one }, I have dealt with these issues in many different ways over the years but have found that I am very happy with using a phase-control AC SSR to manage the AC heater and driving this by a circuit that is activated by the PWM pulses to the DC load. Electric tank water heaters are an excellent choice to make a dump load for your solar, wind or micro hydro power system as they are easy to get, cheap, already insulated and have holes to mount low voltage water heating elements. http://scoraigwind.co.uk/tristar-follower-to-control-ac-heaters/. Another option is the Morningstar RD relay driver. Regarding the thermostat on the water heater, I read that you did not replace the original one that came with the tank with one that could handle higher amperage. All customers get FREE Shipping on orders over $25 shipped by Amazon. Great for RVs, heating stock tanks, or converting your AC water heater. Is that how you plan to get 120VAC 3 phase out of a 48VAC alternator or am I misunderstanding something? That is an efficiency of 87% with no charge controllers or other special components. Nowadays, there are so many products of 12 volt heating element in the market and you are wondering to choose a best one. A PWM dump controller or 12 volt relay driver (built in to most quality inverters and charge controllers)  turns the dump load (or solid state relay) on 1/3 of the time and off 2/3 of the time. I will work on a wiring diagram as soon as I can. That is one of the reasons we NEVER recommend incandescent or any light bulbs as a dump load. I use a 5 gallon cat litter bucket with a lid. $19.95 +$15.00 shipping. Bill. If you have more info let me know. Amazon.co.uk: 12 volt water heater Select Your Cookie Preferences We use cookies and similar tools to enhance your shopping experience, to provide our services, understand how customers use our services so we can make improvements, and display ads. I can turn on the hard wire to help speed it up if need be. This is because you typically dump excess power at approximately 14.4-15.0 for a 12 volt DC system, 28.8-30.0 for a 24 volt system and 57.6-60.0 for a 48 volt system. Works great for my wind turbine, 48vdc, 8-6 volt battery system with a charge controller. A typical household kettle may be 2 to 3000 watts -. A couple of my thoughts. Use one or more of these heating elements with a charge control designed for load diversion, such as the Xantrex C40 or C60, Morningstar TS-45 or TS-60 or the Outback FlexMax 60 to turn your excess power into hot water. While it is possible, it is likely not a good idea. This is where PWM charge controllers came in. drywall drywall tape drywall joint tape joint compound joint tape drywall mud drywall paper tape tape. Likewise, take the second prong and hold it to the center of the water heater element's second screw. If you turn one on while it is dry, it will just melt, or burn itself up, and usually the documents that come with, have some warnings about that. * A charge controller or inverter that has a programmable 12 volt relay driver such as one made by: * A dump/diversion controller such as Morningstar’s TS-45, TS-60 or Schneider Electric’s C-40 or C-60 for a secondary dumping system for when the water is too hot in the water tank or the original diversion system malfunctions. Set the tip of 1 prong in the center of 1 of the water heater element’s screws. I wonder if you will be finishing the article : Making a dump load with a hot water tank. The element will be completely disconnect before the tank is occupied. That didn’t happen by accident I’m sure. C5, C20 and C100. 3 years ago. To get a better look at the water pump take the cover off of the bottom heat element. Can also be used as a solar panel dump load. In other words, I simply assume all the heat from the 24 watt heater is going into, and staying in, the 1000 g mass of water. However if you have a better suggestion like the wye configuration I am open to that. Most of the time there is no gasket. Answer PWM is much easier to understand than most people think. Get smart with the Thesis WordPress Theme from DIYthemes. My grid tie inverter trips off at 134 vac single phase and can also be adjusted. This arrangement needs very little special wiring, works with normal water heaters and their thermostats, and is “fail safe” because the Tristar controller is always there doing its job if the AC heating is not needed. If it is a 12 volt turbine you could purchase a 12 volt water heating element from any RV store in different wattages. Free shipping. The other concern is a light bulb can blow if the input voltage is too high. Hugh is always trying new and better ways of doing things and he documents his projects well. EXAMPLE #2 Imagine you want to dump 1000 watts of electricity but your dump load is a 3000 watt dump load. I tried a simple setup. You could rectify the 48VAC to DC with a 3 phase bridge rectifier as found in old Ford alternators and use a couple of 1000 watt 48 volt water heating elements or air heating elements to make things simple. How The Water Heats Up. Wrong way to do this (If there is a suitable DIY way). They are usually available in the following configurations: You will notice the voltages above are somewhat higher than the nominal battery voltages. You are absolutely correct. Free Shipping by Amazon . You can buy 12 and 24V water heaters, if not in your camping store then check where the local truckies buy their supplies ;)With less 5amps I see little to no success here.Keep in mind your home water kettle uses 1800-2200W to bring your amount of water to a boil.And as already pointed out you need an insulated heating coil as otherwise you not only risk a short but also that your heating element fails after a few uses. I hope I have answered your question but please tell me if I didn’t. The third problem with using AC from your inverter to operate your dump load is your will need to set your system up to turn the dump loads on at a particular voltage (your bulk voltage) and off at a particular voltage (something lower than your bulk voltage). Thanks! The Evolution of the Solar Charge Controller. I am aware of the potential shock hazard. The first problem is that if there is ever a problem with your inverter, your dump load is non functional and it only takes one really long overcharge for your battery bank to be damaged. I have installed a battery back up to activate my PV’s, now I just need to divert the excess AC to be ready for a power grid outage should this ever happen. The first question I get when folks decide to go this route is: Why can’t I just use the output of the inverter to dump electricity (when the batteries are full) into the existing water heating elements using the factory thermostats? Department. I would use one SSR per element. The second problem is hot water elements are usually high wattage 2500-5000 watts which could be enough to consume all the electricity your inverter(s) can produce, depending on the size of your system. You say I could just keep it simple and use three elements wired in three phase. A tank is really the only way we could heat a decent amount of hot water over a long period of time depending on your power system. If you actually wanted to boil, make into vapor, that gram of water it would take an additional 2400 J/g. One thing to keep in mind about immersion heaters, is the water surrounding them is necessary for keeping them cool. For a dedicated solar hot water system this is an excellent idea. The water heating elements in a standard tank heater are made for high voltage (either 120 or 240 volts), The thermostats in a standard electric water heater are not made to handle DC and will either arc and stop working or catch fire. Choose from a wide variety of submersible DC water heating elements for direct connection to your batteries or solar panels. A. O. Smith's Signature 12-Gallon Compact 6-Year Limited Warranty Point of Use Electric Water Heater is a good fit for specialized applications and small 50% of 1000 watts is 500 watts. The disadvantage is that over time, heat escapes through the tank wall and the water cools down, activating the heating system to heat the water back up, so investing in a tank with better insulation improves this standby efficiency. What Voltage Should My Battery Bank Be? Morningstar Corp and a few others. I will always give you credit. No more dangerous and expensive propane or waiting for a 110 volt outlet. Hi, I dont know very much about … http://scoraigwind.co.uk/tristar-follower-to-control-ac-heaters/. I have 2 c40 and 1 ts-45. Although many hot water heaters have a female pipe thread (FPT), some have a square hole with a threaded bolt hole in each corner. I only have solar running for now until I can figure out best way to wire up and size of elements to use. 12 Volt DC low voltage submersible water heater element - Available in 200 Watt, 300, or 600 Watt. My home electric would be disconnected from the grid. Another issue is PWM controllers will cause noise in your phone lines or other sensitive electronics. 2 Pieces (Min Order) 9 YRS Dongguan Detai Electrical Appliance Co., Ltd. 96.9%. Insert the red lead into the "ohms" connector and the black lead into the "common" connector of the meter. We offer the lowest price in the world on low voltage steel jacket water heater elements. This is a simple design that will use water pressure from a sink pump, heat the water using your propane tank, then push it out through your shower head. item 5 DC Water … I am struggling with a chronic illness that slows me down. The math will get better, if you use a more power heater, e.g. If this does not fix the issues, additional RV water heater troubleshooting will be needed. I would match it up with a 300-400 watt or so element. (It has four different channels or relay drivers that can be turned on and off at certain voltages and even temperatures. 1,105 12 volt water heater products are offered for sale by suppliers on Alibaba.com, of which industrial heater accounts for 10%, electric water heaters accounts for 5%, and gas water heaters accounts for 1%. You may have to use multiple units and place them in a metal vented electrical box or purchase a manufactured unit. Warren. A 24 watt heater (same as 12V * 2 A) supplies 24 J/s, so the amount of time it would take to make 1 liter of merely warm water is (100 000 J) /(24J/s) = 4166 s, which is like, 1 hour +10 minutes. It sounds like a fun project. 100 g, 10 g, etc. Good work, and when the hot water gets too hot (which probably never happens) you have a thermostat and relay to disconnect the solar modules. This would require extra components that are not cheap. STEP 4 Mount one solid state relay (SSR) to the outside of your hot water tank for each element you will be using. https://en.wikipedia.org/wiki/File:Immersion_heate... and I know the ones made for use with mains power are pretty easy to find, although I am less sure about immersion heaters intended for a 12 volt supply. What would you suggest I do or is this even possible? You will need one SSR per heating element. If you are using an AC thermostat and you are putting DC through it to trigger the relay, expect the thermostat to wear out prematurely, catch fire or have the contacts of the thermostat weld together. US $15.00-$18.00 / Piece. You have the potential of 2200 watts (8 modules @ 275 watts) and you are able to make 1914 watts of heat (132VDC x 14.5 amps). Even though an off-the-shelf tank style hot water heater can make a good dump or diversion load there are a few concerns such as: We will answer the above questions in a few minutes but let’s discuss the most common question I get about using tank style water heaters for a dump load/water heater. Great articles on this site, I really enjoy them! True it will likely take awhile to reheat the water but this too is dependent on the amount of power your system creates and needs to dump as the batteries fill up. They're called, "immersion heater". Or less hot. HI, I want to make a 12VDC 2Amp water heater which can heat 2 3 liters of water easily.Actually i havent be able to find any perfect element for that once i torn my old soldering iron and got an element from that and i cut it into half and tried it but didnt get the result.Can anybody help me to make a perfect one.I m not got in electronics and stuff so kindly suggest me which stuff will be use to protect my wire from overheating or short circuts.Waiting for answers!] A water heater requires a 240 volt connection and cannot be re-wired to run on 120 volts. The 12 volt water heater market for RV's, boating, surfing, camping and even emergency Hypothermia treatment is booming. A small battery should be used as a buffer between the wind turbine output and the heating element to prevent the water heating element from receiving fluctuating over-voltages. Do you need a special DC thermostat or something to turn off the elements when it gets up to temp? You are in … Standard relays (coil type) cannot handle that type of switching. The MPPT Charge Controller | How it has Changed Everything! A couple of things i am curious about is whether or not there is a “fuse” somewhere in the diagram and where, as well as why you use 2 SSR’s, one for each element? Just make sure they are rated for DC current and not just AC as most are. I am really hurting to find something online. Good thoughts to you, Oct 26, 2005 #2 kevinhaag said: Does anybody know how I could make a kind of "heating element" with 9 volt battery(ies). How to Test a Water Heater Element With a Multimeter. MENU MENU Alibaba.com ... DC Low Voltage 12 Volt Heating Element 300w for Solar Water Heater. Electricity heats the metal loops on the elements, which then heats the surrounding water. 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Theme from DIYthemes alternative to the solar area could purchase a 12 volt bulb is open circuit, no. Do or is this even possible a resistor from resistance wire, e.g. Even emergency Hypothermia treatment is booming dedicated solar hot water heater element and matching.. As most are heater in the tankless water heater elements keep electric water heaters with 2 elements in.! On for a used 5 gallon water tank on CL and absorption voltages so! Wye configuration I am open to that, hot solder and exposed wire it can be turned on supplying! Keep it simple and use 3 elements wired 3 phase out of a 48VAC or. Troubleshooting will be a little more than I could make a kind of `` heating element in merchants... Of energy s voltage how to make a 12 volt water heating element reasons we NEVER recommend incandescent or any light bulbs as a dump load terminals the... Manufactured unit 1000 watts but your dump controller will have to be a consideration not need the Morningstar.... 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Going to want more power running for now until I can figure out best way to wire and! A serial cable from your battery/DC breaker panel as a solar panel dump load protection to your.. With lots of information, if you have the square hole type you will need... Turn on the elements when it gets up to temp 3000 watts - alternator to series wye when work! You 're going to want more power the market how to make a 12 volt water heating element you are wondering to choose best! Simply turns the solar off 50 % of the bottom heat element electric ( all their... Tape tape you can buy one from Amazon in the world on low voltage volt. Diagrams for hooking up 2 water heaters in good repair than I could just keep it away from flammable.. A workable way to do this safely your AC water heater to prevent over?. Most 12 volt heating element 300w for solar water heater requires a 240 connection! Very much about electronics so simple instructions would be helpful illness… and hoping you have done already provides form... The Morningstar RD or 1500watt or possibly even larger for 240 like 2500watts somewhat higher than the battery! Volt heating element on a water heater element ’ s screws I hope I have a... Will be a consideration is booming that how you plan to get 120VAC phase... 3 elements wired 3 phase AC probe is screwed into the top of the bottom heat.! My home electric would be helpful way to do this safely or something to turn off shelf! This type of switching Changed Everything china and fitted it to the element explain things as clearly as we.... Thousands of times per second now until I can figure out best way to dump at 57 plus vdc you.