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bondibiz

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Posts: 3
Reply with quote  #1 
Hi There,

Simple question -

I am using a small solar panel to top up a 12 volt battery which in turn powers
a 12 volt motor and micro processor which draw virtually no power.

My question I have connected the two above to the power outlet on the 
solar controller. It works, is this OK to do this way ?

From what I have read the connections should be coming directly from the battery.

Thanks
Tony

stmbtwle

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Reply with quote  #2 
You should be fine, that's what it's for. The power connection may have a safeguard to prevent overdischarge of the battery, and may be programmable, but it's limited in its capacity. Larger loads have to be directly on the battery.

Controllers vary, check your manual.

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
Rick H Parker

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Reply with quote  #3 
My question I have connected the two above to the power outlet on the 
solar controller. It works, is this OK to do this way ?


Electrically, connecting the motor at the charge controller outputs is the same as connecting the motor at the battery terminals. Unless you have too small of cables between the charge controller and the battery, there should be no problems.

Just make sure the wire from the motor is in contact with the cable to the batteries. That way your know the motor will not draw too much current through the charge controller  terminals

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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
stmbtwle

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Reply with quote  #4 
"Just make sure the wire from the motor is in contact with the cable to the batteries. That way your know the motor will not draw too much current through the charge controller terminals."

If so, what's the point of using the charge controller output at all? Connecting the load terminals to the battery terminals defeats their purpose and may even damage the controller.

However we need to get something straight. Some (not all) controllers have TWO outputs, one for charging the battery and one for the "load". Which one are you using? If you're connecting the motor to the battery charge terminals, it's essentially the same as connecting to the battery. The load current does not go through the controller. If you're connected to the "load" terminals, it does. It's limited in the amount of amps available, but often has a low voltage disconnect and sometimes a timer.

Within limits, either one will work. For heavy loads connect directly to the battery. Do not connect your load to the solar terminals.

"When all else fails, READ THE DIRECTIONS!" Not all controllers are the same.

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
Rick H Parker

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Reply with quote  #5 
Willie, have your morning coffee then, reread what Tony wrote when you wide awake. [eek]



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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
stmbtwle

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Reply with quote  #6 
Had my coffee. Maybe YOU should. He has them connected to the "power outlet" which is probably the "load" connection (if it has one), but he didn't specify.  He DID say it worked.  From what he has read WHERE? The manual or online?

Whatever the manual says, I'll go along with.

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
Rick H Parker

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Reply with quote  #7 
but he didn't specify

"I have connected the two above to the power outlet on the
solar controller. It works, is this OK to do this way ?"

His statement leaves me no doubt what he connected and to where.

What other output could it be and still work ....


From what he has read WHERE? The manual or online?

Most will tell it that way for simplification, they don't need to educate the end user on the details I listed above ... but that does not mean it is the only way the cat can be skinned.

 

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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
stmbtwle

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Reply with quote  #8 
In most cases you don't have to "educate the end user" but when you work with certain people and a new-to-them technology you have to be very specific or I guarantee they will get it wrong.  

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
Rick H Parker

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Reply with quote  #9 
In most cases you don't have to "educate the end user"

They need to be educated on the product to some extent, that is what the manual is for.
The ones that toss the stinking manual are the ones that get into the most trouble.

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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
stmbtwle

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Reply with quote  #10 
Have to agree there! Sometimes though there isn't a manual, or it's written in Chinglish and none too easy to decipher.

As to "What other output could it be and still work..." ,  Most small controllers have six connections.  2 for the solar panel, 2 for the battery, and two for the load.  EITHER of the second two pairs will work for the load, as long as the battery is connected to the battery connections as well.  And then there is of course the battery itself.  So there are three possibilities all of which will work.  Only the "load" connections have an LVD and sometimes a timer (useful for lights).  

Some small controllers only have 4 connections, 2 for the panel and two for the battery.  The load would have to be connected to the battery.

I have never seen a connection labeled "power" on a charge controller, though anything is possible.  It could be confusing which might be the issue.

scc2.JPG    
sg.JPG
 So much for educating the end user, I hope the poor guy hasn't drowned in TMI!


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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
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