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Inverter design help
By sweetwind, Section Newbies Posted on Mon Nov 09, 2009 at 04:46:06 PM MST
Inverter design for a 840w output and 15(40watt lights),5 fans.

Hi
Planning to use the resource of my farmhouse water pumping unit (6hp which has 1600 rpm), now the plan is after connecting a shaft and a pully to it, will connect a dynamo i bought it in local electrical shop, as per the specs of dynamo
it is 24v and 35a output at 1000rpm, since it is constant output, is it possible for us to place an inverter and use the output power for lighting and fan as follows
DC Output->rectifier->inverter->connect it to my farm house for 15 tubelights appx?
if it can be! what kind of rectifier should be used here? is there any inverter circuits available?

Inverter design help | 7 comments (7 topical)

Re: Inverter design help (3.00 / 0) (#1)
by snake on Mon Nov 09, 2009 at 10:44:48 PM MST

i believe that you can use the method you said because it is runnung at constant speed but you should bear in mind that when you will connect the inverter directly to the motor,you should not exceed the maximum output of the motor.

i think that you wont need the rectifier becaude the inverter needs dc current to be converted to ac.

it depend on the wattage of the tubelights.

i think that you will also need to decrease the rpm to 1000 coz your dynamo is rated at 1000rpm for maximum output

Re: Inverter design help (3.00 / 0) (#2)
by sweetwind on Mon Nov 09, 2009 at 11:04:36 PM MST

thanks for the timely help mate. how about the size of inverter? can you please give me a clue?

Re: Inverter design help (3.00 / 0) (#3)
by snake on Tue Nov 10, 2009 at 02:27:58 AM MST

your motor will give 25V x 35A = 875 watts....

i think an inverter of minimum 1000watts is good.

Re: Inverter design help (3.00 / 0) (#4)
by snake on Tue Nov 10, 2009 at 02:31:12 AM MST

in any case, you will not need a rectifier,

to build an inverter is very difficult task but not impossible, i would advise you to buy one,its easier and cheaper compared if you will build one.

Re: Inverter design help (3.00 / 0) (#5)
by Flux on Tue Nov 10, 2009 at 02:52:26 AM MST

In theory you can run an inverter directly from a dynamo with no battery. In real life it probably won't work. I doubt that the dynamo will be able to handle any load spikes without adding a very large capacitor bank in addition to the input filters of the inverter.

Without a voltage regulator I think you will spend a lot of time tripping the inverter on over volts or under volts.

If you have an inverter try it but I wouldn't go out and buy an inverter expecting this to work.Even with a decent field control regulator on the dynamo I think you are pushing your luck, without it even less chance.

Flux

Re: Inverter design help (3.00 / 0) (#6)
by sweetwind on Tue Nov 10, 2009 at 08:16:52 PM MST

thanks for the valuable comment flux and snake,

can i use LM1117T voltage regulator? or any suggestion on this end?

Re: Inverter design help (3.00 / 0) (#7)
by sweetwind on Mon Nov 30, 2009 at 08:17:58 PM MST

Finally i bought 28SI High Output Alternator and the output of this is 12v 135amps, now i really need to move towards inverter and charge controller portion. can you pls help me to identify suitable charge controller and size of the inverter i need to use?

Inverter design help | 7 comments (7 topical)

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