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Forum Index : Windmills : water heating
| Author | Message | ||||
| Gunt Newbie  Joined: 31/10/2023 Location: IrelandPosts: 3 |
Hi New to post but read alot here so far . so to lay it out , we will have pv solar near 8kw but to subadise this for water heating , i had planned to build a low cost wind mill using an newer altinator , 300amp jsut so you know where i'm comming from , on a comercial unit we have a 45kw mill and ther is a feature for water heating where 1 phase power is bypassed from being rectified and sent straight to the element unrectified , this allows the full energy volts and amps to flow free , with the benefit of gusts , and we can see anything to 3xxv and carzy amps flow resulting in heating 600l of water in 20min , as the water can take the spiks and shocks so my thoughts [ i know volts are easier to manage ] but 300amps would be serious heat so the questions are anyone know of an element that can take 24v 300amps , or will the std 240v work wired only direct to the alt and i want to wire this straight to the element , wing spans required and any blade company recomended , should i remove the rectifier / regulator or should i rethink in 240v Cheers |
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Revlac Guru  Joined: 31/12/2016 Location: AustraliaPosts: 1020 |
A little over 7Kw, haven't seen anything like that for 24v, perhaps one could be made. A 240v heater would be available even if it requires more than one element for that high power level, perhaps some others could chime in? Cheers Aaron Off The Grid |
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Clockmanfr Guru Joined: 23/10/2015 Location: FrancePosts: 429 |
I use these........ 1ohm resistor or these 2.2ohm They can be parelled up. I use them to dump 9Kw at 48 to 60vdc, but 24v, your cables to each are going to be huge and thick for that kind of amperage.  Edited 2023-11-05 19:17 by Clockmanfr Everything is possible, just give me time. 3 HughP's 3.7m Wind T's (14 years). 5kW PV on 3 Trackers, (10 yrs). 21kW PV AC coupled SH GTI's. OzInverter created Grid. 1300ah 48v. |
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| Gunt Newbie Joined: 31/10/2023 Location: IrelandPosts: 3 |
thanks for getting back to me for got to say , its heating a multi element 2-3000 lit buffer tank and a 300lit hot water cylinder , the 3000lit only is required to be 40 deg c but the 300lit will be for hot water , so 70 or so deg thats a 12v altinator , you will find them in 10yr old mercs , advice welcome |
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| mab1 Senior Member  Joined: 10/02/2015 Location: United KingdomPosts: 209 |
You can get 12v and 24v elements, but they tend to be pricey, and lower power ratings. Technically, you could connect a 240v element to a lower voltage a.c., but the power is proportional to the voltage squared: i.e. if you connect a 240v 3000w element to 24v it would only heat at 30w. I think most people find it most practical to convert power to a higher voltage to use the standard elements:- ie, feed your power from the mill into a battery and inverter for 240v. |
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| Gunt Newbie Joined: 31/10/2023 Location: IrelandPosts: 3 |
thanks for the input but the idea would be to remove the regulator and let it produce what ever keep it on its line to its own element , thinking there is a loss when converting and on its own line i can take advantage of gusts i was thinking [ probally wrongly ] that watts - volats and amps could be related to bhp and torque , and its torque that does the work and amps would be related here and volts to bhp , which would be more efficient Cheers |
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phil99 Guru Joined: 11/02/2018 Location: AustraliaPosts: 2129 |
To aid with your calculations:- 1 BHP = 746 Watts 1 Watt = 1 Amp x 1 Volt 1 Watt = 1 Metre-Newton (torque) x 1 Radian / Second (rotation speed - 2Pi radians per revolution so 377 RPM = 1 Radian / Second) Output voltage is related to input rotation speed. Output current is related to input torque. Output Watts are proportional to input BHP |
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