Hydrogen, Fuel Catalyst and Alternative Fuel Forum
March 28, 2017, 08:23:02 PM *
Welcome, Guest. Please login or register.
Did you miss your activation email?

Login with username, password and session length
News: **** There is a huge volume of information in this Forum and our statistics show each guest visiting is here for a great while...... If you are a member, the Avatar icons in the far left become darker and once you have read the info they become lighter. This will help you to identify what you have already read......... Become a member..... It costs you nothing and after all, this Forum was put here for you - I can guarantee you will get no spam using your email to register ****
   Home   Help Search Login Register  
Pages: [1]   Go Down
  Send this topic  |  Print  
Author Topic: PWM auto no/off  (Read 6747 times)
Full Member
Offline Offline

Posts: 30

« on: July 05, 2013, 11:59:54 PM »

I posted something similar to this in the hazards section, and it concerns making sure that there is no power to the cell when the engine is not actually running. The simplest solution I've found is a product called PWM30A from HHO-PlusUK which you can see here on uk ebay http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=271219811126
This uses an extra pair of sensor wires on the battery terminals to detect when the alternator is charging the battery. It only provides power to the cell when the voltage rises above 13.8V
I think this is such a simple and clever idea. There is also an enable input that can be used with a float switch in the reservoir, a thermal switch or both.
This idea could be used to control a relay if you don't want to buy their controller. Obviously there needs to be some kind of hysteresis in the sensing circuit to prevent oscillation because the voltage is bound to fall when the cell starts drawing current.
I've attached their manual so you can see how this connects in practice.

* PWM30A_english_2013.pdf (1371.89 KB - downloaded 2657 times.)
Offline Offline

Posts: 2

« Reply #1 on: August 09, 2013, 06:04:30 AM »

Sounds like a much better idea than having a manual switch. I know that I already sometimes forget to switch off the things that I have manually hooked up to my battery.
Pages: [1]   Go Up
  Send this topic  |  Print  
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.20 | SMF © 2013, Simple Machines Valid XHTML 1.0! Valid CSS!
Page created in 0.084 seconds with 20 queries.