I need to keep the batteries fully charged by the end of the day, hence the charging system I'm talking about.

 

I need to keep the batteries fully charged by the end of the day

The battery driving the motor will be discharged by the end of the day.

 

Wouldn't you be better served by powering the alternator by a gasoline engine? It seems like you are trying to make an 'overunity' device here.

 

My idea is that the converted motor will turn the other alternator for batt charging then the batt will also power the said motor but at the same time providing power to the inveter therefore the batt will be kept fully charged. It's a simple circuit that won't need anything not even gasoline. Actually I had to go this way because where I come from(Zimbabwe,Africa) water is expensive on it's own, not to mention gasoline, it's a luxury I can't afford. I seen videos on YouTube on gocarts using these altmotors and I believe I can easily use one for my kind o project. Actually I have converted my alternator and it's running but I need it to have more power and that's where you guys come in, I just hope one of you will help with just that. I've been pitting 5v1A to the field windings but then someone suggested that I increase voltage/current to the field windings so as to increase the strength of the magnetic field therefore increasing power/torque of the altmotor. Power to the stator windings is 12v via a 30A ESC and servo.
I hope I'm making sense.

 

yeah, that's called perpetual motion AKA overunity. It's physically impossible. Energy has to come from a source.

 

Won't the alternator charge the batt or something?, I think the system has to work just like an ordinary car's charging system.

 

Just look at your relative working efficiencies of both the motor and the alternator and do the math.

For every 100 electrical watts of power you put into the motor you get 50 - 75 watts of mechanical power out. From there the alternator, which has the same average efficiency, puts out 25 - 35 watts of electrical power that goes back to the battery ultimately having burned up 65 - 75 watts doing absolutely nothing of value to anything in the system.

Realistically for all the work you have done you would have been time and money ahead to have set up an old bicycle to work as a stationary bike where your pedaling spun one of the alternators in order to generate electricity to help recharge your battery. To which even with that for a good hours had riding you might have put 30 -50 watts of energy back into recharging your battery.

Personally if it was me and I needed to increase the system run time I would be looking at either reducing the load or increasing the battery capacity by adding more batteries.

 

Thank you so much tcmtech, now that's something. The system I'm ppanninf to come up with will be using two 200Ah deep cycle batteries, but at least I can use one 200Ah deep cycle batt. I electrical projects, not that I'm an expert at what I'm trying to come up with. Thank you again for the Math part. I'm now caught between a rock and a hard place, but I need to get this going. DC motors are expensive and especially here. What do you think will be the best answer to my equation?

 

I'm looking forward to something like this:
http://www.alternatorconversions.com/alternator_conversions_rdr5.php

 

DC motors are expensive and especially here. What do you think will be the best answer to my equation?

Either you have to add a bigger battery set or reduce the power consumption of the load the inverter is carrying. There isn't any other solution that will add energy to the system without it needing a different power source to function.
Either add a gas engine running one of the alternators, or add a wind, solar or thermoelectric based generator system to supply more energy.

How are you recharging the batteries now?

 

I'm looking forward to something like this:

Get a higher powered BLDC motor driver and the correct size of batteries to make the alternator work as a motor and have at it but I guarantee you won't get more electrical energy out of it that you put in.

 

A better idea of the source of your water can get more ides of how to do this, without electrical power at all. There are many "old school" ways of pumping water. Windmills have been used for hundreds of years. If the water is coming from a moving body of water, river, stream or even some types of lakes, there is the hydraulic ram pump.

 

Ok, thank you for your time. I'll let you know what will work. Thanks a lot.