NWS Heating Element
HumMichael
Registered Users Posts: 26 ✭✭
I have some extra panels and was looking at our host's dc heating element which are significantly expensive than other ones I can find.
I don't mind paying extra if I know why it costs more.
It will be just for pre-heating purpose before going into main water heater.
Anyone wants to share this brand experience?
I would like to stay 24 or 48v setup.
Thanks
Sincerely
Michael
I don't mind paying extra if I know why it costs more.
It will be just for pre-heating purpose before going into main water heater.
Anyone wants to share this brand experience?
I would like to stay 24 or 48v setup.
Thanks
Sincerely
Michael
Comments
-
You can get a high wattage element from a hardware store and use it at lower voltages/currents:
http://www.homedepot.com/p/4500-Watt-240-Volt-Low-Watt-Density-Watt-Fold-Back-Screw-In-Stainless-Steel-Alloy-Water-Heater-Element-15011/204834493- P=I^R=V^2/R=V*I
- R = V^2/P = 240v^2 / 4,500 watts = 12.8 Ohms
- P = V^2/R = 24^2 / 12.8 Ohms = 45 Watts
- P = V^2/R = 48^2 / 12.8 Ohms = 180 Watts
http://www.homedepot.com/s/water%20heater%20elements?NCNI-5
Also, lower rated voltage / wattage (AC input) does not mean lower power at lower DC voltages:
http://www.homedepot.com/p/1500-Watt-120-Volt-High-Watt-Density-Screw-In-Water-Heater-Element-15024/204834407- P at voltage = element rating at AC power * DC volts ^ 2 / AC volts ^2 = 1,500 Watts * 48v^2 / 120v^2 = 240 Watts
-Bill
Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset -
Thanks Bill. I've done search function and have read other folks trying to do the same.
I was just curious if our host's listing was much different than Hurricane solar guy's items.
I am assuming that SSR is necessary when using "waste-not" auxillary function on my Midnite Classic.
Thanks
Sincerely
Michael -
I don't work for NAWS, and I rarely talk with them (just details about the forum).
I would guess that elements are Similar between vendors (and there are good and bad).
Low volume stuff (solar only stuff) is going to be more expensive.
If you have questions, please give our host a call. They have more information than I.
-BillNear San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset -
Maybe wire the thermostat (or any thermal switch) and the aux output in series and then to the input of a DC SSR.
I am available for custom hardware/firmware development
-
Bill, I certainly didn't think you had any affiliation with NWS.
You have been a great moderator for a short time I have been on. Thank you.
Sincerely
Michael
-
Michael,
No problem... Sometimes new folks may not understand why I do not speak for NAWS. I don't work for them--I am just a volunteer here.
-Bill
Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset -
I think Bill does a great job.
I am available for custom hardware/firmware development
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