Hi there,

Good question
We have 24v dc 400w with batteries from a solar system and need to ran my water system on 24v ac 800mA

Is there a circuit that can help me as I don’t want to put a inverter near my fence.
nearest power point is 75m from the water point

Thanks

Mod: Link to old Thread.E
https://forum.allaboutcircuits.com/threads/24v-dc-to-24v-ac.173720/post-1563724

 

Hi there,

Good question
We have 24v dc 400w with batteries from a solar system and need to ran my water system on 24v ac 800mA

Is there a circuit that can help me as I don’t want to put a inverter near my fence.
nearest power point is 75m from the water point

Thanks

Sorry forgot 50hz

 

Why does your water need AC?

 

Help you do what, with what, where, and why? I don't see a workable question in your post.

ak

 

What you want sounds like an inverter, but you don't want to use one of those. There is no other circuit that I know of that will do what you want. Do you have any shred of a reason to believe that such a circuit exists? If so, would you kindly trot it out?

 

It’s only 20W - an audio amplifier would do it.
But my suggestion would be to buy a DC version of whatever undisclosed piece of equipment needs 24V AC.

 

It looks like you are controlling water valves so 50 or 60hz does not matter.

SUNGOLDPOWER 3000W Peak 9000W Pure Sine Wave Power Inverter DC 24V AC 120V with Battery AC Charger Solar Wind Power Inverters LCD Display Low Frequency Solar Converter

There are small solar 24V to 120 or 220 volt inverters. Next use a 120V to 24V transformer.

 

It looks like you are controlling water valves so 50 or 60hz does not matter.

There are small solar 24V to 120 or 220 volt inverters. Next use a 120V to 24V transformer.

That product claims to be 100% efficient. What’s it made out of?
If that is true, why does it need a fan?

An inverter (except the 100% efficient types) has a no load current of about 1% of total load. That would be at least 30W.

 

Sprinkler system valves run on 24 VAC, and according to this there are problems running them from DC. So, 50 Hz sine wave (from an 8038 or 2206 function generator board) driving a class-D audio amp could work, or maybe just a 50 Hz h-bridge driving them with a square wave would be OK. Or, the very obvious solution: 50 Hz inverter and a transformer.

 

Seems to me that using a constant current solenoid driver off DC would be the simplest solution. A buck-derived constant current LED driver IC would work well as the solenoid acts as the inductor in the circuit.
Even better would be to use an LED driver IC with an analogue dimming input, and use that to pulse the solenoid to full current at startup then back it off to 300mA.
Before I spend any time drawing it up, I note that the TS has yet to confirm whether our assumptions are correct that it is solenoids that require AC.