800w 400 rpm 60 hz 120v permanent generator

[TommeyLReed]

I agree Mark, but this does look like a system that could be a off the grid. I got the engine on order and also other parts.

[mscoffman]

Tommy,

One thing you are going to need is a voltmeter hooked to the microcontroller
to measure the battery voltage state of charge. This is important to know when to start
charging and when to stop charging. Also if the inverter gives up when the battery state of charge
voltage falls to it's low trip point, there may need to be a relay to cycle the inverter to reset that
condition. This is because even though the generator is running it, probably cannot support
the whole 5KW load of the inverter worst case. Those they say are the keys to long
battery life. Stop charging when the batteries are full (they go into electrolysis) Never
let the voltage fall below 80% discharged voltage point (like 10.xxVDC). Don't leave the
batteries in low state of charge for any amount of time unecessarily. Also they say that the generator should not
output more than 2X the rated voltage of the battery bank. This could be adjusted at the transformer.

It would also be nice to know how much power the inverter is using so the microcontroller could
use some heuristics to know how much energy needs to be replaced as a block.

I like the concept of using something other than voltage state of charge to know when
the batteries are full. I would feel comfortable using audio accoustics to detect the onset
of electrolysis using a stethescope input to a processor. Another might be the heating
of the hydrogen recombine catalyst area but that would depend on the AGM battery design.


:S:MarkSCoffman

[TommeyLReed]

I agree with just about everything you said, having built a EV in the past the batteries is best when using only 20% of stored energy. In fact I plan to use a 48v inverter system, this will draw less amps per battery. I also like to add that programing micro controllers you would need rpm readings and amps reading to control start up and load control. 

This is another test of a true sine wave on the experimental 18 pole 400 rpm generator.

http://www.youtube.com/watch?v=H8Mk3rA-2SE

Tom.

[MarkE]

Tommy,

One thing you are going to need is a voltmeter hooked to the microcontroller
to measure the battery voltage state of charge. This is important to know when to start
charging and when to stop charging. Also if the inverter gives up when the battery state of charge
voltage falls to it's low trip point, there may need to be a relay to cycle the inverter to reset that
condition. This is because even though the generator is running it, probably cannot support
the whole 5KW load of the inverter worst case. Those they say are the keys to long
battery life. Stop charging when the batteries are full (they go into electrolysis) Never
let the voltage fall below 80% discharged voltage point (like 10.xxVDC). Don't leave the
batteries in low state of charge for any amount of time unecessarily. Also they say that the generator should not
output more than 2X the rated voltage of the battery bank. This could be adjusted at the transformer.

It would also be nice to know how much power the inverter is using so the microcontroller could
use some heuristics to know how much energy needs to be replaced as a block.

I like the concept of using something other than voltage state of charge to know when
the batteries are full. I would feel comfortable using audio accoustics to detect the onset
of electrolysis using a stethescope input to a processor. Another might be the heating
of the hydrogen recombine catalyst area but that would depend on the AGM battery design.


:S:MarkSCoffman

That's the function of a charge controller.  They are widely available and relatively inexpensive.  Lead acid batteries are pretty forgiving of even crude charge controllers.

[TinselKoala]

This is another test of a true sine wave on the experimental 18 pole 400 rpm generator.

So where's the "true sine wave" then?