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Generator Auto Start

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Posted by Richard Salter on December 10, 2006, 10:37 am

Hi , I am after a simple device to auto start a diesel motor to charge
my solar batteries when the sun is down .
Basically a system

    * to sense when the voltage is down  eg 11.9volts
    * Turn on the engine . it has a 3 wire start up , on/off  , and
      starter motor on off
    * the generator has a oil pressure switch so this can be used to
      measure if it is running
    * Then I need to let the motor warm up for say 5 minutes , and then
      turn on the alternator circuits to start charging my 12 volt
    * The unit would need to run for maybe 2 hours , and then have a rest.

If anyone has a similar device that has been succesful I would love to
hear , I am also reasonably able to build something up from a  circuit
if it is not possible to get something simple off the shelf.

Thanks for reading my message     Richard

Posted by homeboy465 on December 10, 2006, 11:22 am

I don't know about buying one but if you know the basics of circurtry  i
would suggest making your own a timer circuit is as easy as a capasator and
a transister though 555's are eaiser again. custom made devices are usually
better cause they do exactally what you need. i've just drawn up a circuit
for being ale to add and remove battries/cells from a charging/supply system
without inturpting the flow atall it may efect the total output but as long
as this is always slightly more than what i intend to use then adding and
remooving cells shouldn't be a problem incase they become faulty it will
also mean that if one does falut the circuit won;t be broken ad i won;t just
loose power. i just have to get it checked over my by old lecturer (i like
running things past him as a proff check) and i'll be ready to build a
working model and testing ti before making the final product.

Posted by Vaughn Simon on December 10, 2006, 3:46 pm

     Just my experience: I would never use a 555 or any analog device for a time
delay that runs into the hours.  I have found them to be unreliable over a range
of temperatures and other conditions, and you can spend days simply getting the
adjustments correct.

  Even though I would consider myself (more or less) competent to design the
controller the OP requires, I see no reason to build something that must be
commercially available.  It just makes no sense to continually "reinvent the
wheel".  It is not a good use of your time and the end result is unlikely to be
cheaper than, or superior to, the commercial product.


Posted by homeboy465 on December 11, 2006, 1:04 pm

the 555 was just to sat that that is a n easy timer i wouldn;t suggets taht
as i long term system you can get cheep and efective chips that do  all that
in ione now i have never seen a starter, as was asked for, on general sales
they are usually specialist items and are usually hand built them from what
i have seen opof people that had the old push button starts that became a
fastion (thanks greatly to films like back to the futuure with biffs car). i
was making a suggestion mearly that if you do know where they are available
that do the exact task that is needed included the 5 min delay between the
starting and the acutal using then by all means put a link so that richard
can get one.

Posted by DJ on December 10, 2006, 3:22 pm

Richard Salter wrote:

Might want to take a look at the DynaGen.Ca line of motor autostarts.
Some of them are pretty impressive, I've used them on a few installs


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