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

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?

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

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

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.

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

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