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 TechLuck Solar Hybrid Hot Water Controller Other Tests

Solar Hybrid Hot Water Controller Other Tests


We have tested a number of different water heating elements in several configurations.

• 1500W 120V Water Heater Element (Home Depot) using 400W of "48V" configured 12V series connected solar panels, meaning 84V open circuit max. and also up to 750W (3 x 250W in series and bigger box). MPPT worked perfectly with the standard Solar Hybrid Hot Water Controller as shipped. Total daily power output to the water is only a little more efficient (mornings) than a standard 240V 4500W element but may not be worth the drain and changeout of the element for 750W input. Note that 1500W elements are found on some smaller size tanks that use 120V. This was mostly a low power test at 400W for people who want to run a small tank, like maybe 20 gallons. The 750W test (with bigger box) shows that you might get a little more power in the mornings etc.. on a bigger more normal tank, and the heatsink temps are still within limits. WARNING - DO NOT GO ANY HIGHER WATTAGE WITH THIS ELEMENT !!

• 2000W 120V Water Heater Element (Home Depot) using 500W (2 x 250W and Eaton box only). MPPT worked perfectly with the standard Solar Hybrid Hot Water Controller as shipped. Total daily power output to the water is a little more efficient (mornings) than a standard 240V 4500W element but may not be worth the drain and changeout of the element. Note that 2000W elements are found on some smaller size tanks that use 120V. This was mostly a low power situation at 500W for 1 person who does not use much hot water. Working on a 50 gallon tank for months (still going). 500W is great with this element for low very conservative use in a more off grid situation, like using a generator or grid with a MANUAL, HAND PLUG IN (2 socket setup, one solar side) for more than a few bad solar days, connected to the normal top connection on the tank so the upper element comes on first, both elements changed out. WARNING - DO NOT GO ANY HIGHER WATTAGE WITH THIS ELEMENT!! This means DO NOT TRY IT ON 750W - The controller gets too hot! DO NOT GO THERE EVEN WITH A BIGGER BOX! You don't need to do this at 750W anyway so DON'T DO IT! You want to smell smoke?

• 200W 12V Immersion Heater for RV or a 200W 12V Car Heater using 200W of "24V" solar panels, meaning 42V open circuit max. This was just an experiment but the fan did run at about the same speed as normal. These heaters are sold to defrost windshields on cars where the defroster isn't working and plug into a car cigarette lighter socket. MPPT worked perfectly with the standard Solar Hybrid Hot Water Controller as shipped. Due to the lower voltages, a really good larger heat would be needed, like a 1/16 thick or better metal plate backing the Eaton box (box flattened in back) to increase heat sink area when using a 12V element, there is a heat issue and more wattage input will over temp the unit! This was only for testing. Please do not do this with the standard controller. If this is truly your application for the SHHWC, please contact us and we may be able to build you a custom unit for this special application.

If you use your imagination and a little creativity in special situations you could maybe use a space heater (like the car heater above) or other resistive element device (with only a heating element, no motors) to heat things, like maybe heating a horse water trough or barrel to keep it from icing over in the winter. It doesn't have to be water that you are heating. Please contact us and we may be able to build you a custom unit for special applications. Please contact us before doing crazy things, you don't want a dead controller and we don't want to have to fix it.

Remember that all of the above tests were not done for a extended period. Meaning it's up to you to monitor heat sink temps when increasing wattage or doing experiments like the above ones. The best tested setup including customer feedback is the recommended 4500W 240V standard water heater element and a "48V" set of panels (minimum setup + grid backup), or 750W (3 panels in series + grid backup) with a bigger box for more heat sink area. Do not exceed the Solar Hybrid Specs

Please read the FAQ.

Always use a thermostat on any element! A professional installer or electrician should be used for any install.

Custom designs, programming and modifications are available along with Engineering Services for other designs and needs..

















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Solar Hot Water Controller
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· Solar hot water the easy way, no plumbing


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· Keeps your batteries charged any extra goes to a Grid Tie Inverter
· Run a 600W GTI at higher voltages for less wire loss and better performance


Wind Turbine PWM Dump Load Controller
· Keeps your wind turbine within set limits without wasting power


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Solar Space Heating Sys
Educational Project Idea

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· Heat a room or area directly with Solar PV
· FREE ENERGY ROOM HEATING IS HERE !
(this is now just for info)






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