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Discuss Solar panel and pond pump in the Solar PV Forum | Solar Panels Forum area at ElectriciansForums.net

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I have a solar panel which I want to use to power a pond pump. This is what I have so far:
100W, 12V solar panel
12v 9Ah lead acid battery
50W, 12V pump
And a solar charge controller (12V, 10A).

The pump runs perfectly off the battery.

When I connect it all together on the controller, the controller shows a "short circuit" error. What's going wrong? Is there too much charge? I can only assume I've got the wrong controller.
 
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Wilko

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Arms
Esteemed
Hi - can you tell us the controller make / model? Just guessing, but perhaps the battery is looking to pull more than 10A from the controller. If you’ve a car battery charger you could try charging the battery fully (by itself overnight say) and then reconnect it the next day.
 

Charlie_

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Arms
I recommend;
Replace the 9Ah battery for a leisure battery.
Install a change over switch, don’t be running the pump whilst charging the battery
 
In theory... the setup you have sounds sensible... but can you do a quick diagram of how you've wired them up ? Also pics of the data plates for panel and controller would be useful.

No harm in charging and running at the same time... boats do this all the time...
 

Charlie_

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Arms
So do cars but in this set up it is most efficient.
The battery is too small and the panel won’t be able to cope
 
I agree that the battery is very small Charlie... needs a bigger one for sure... and I'd want something to disconnect the battery once it's voltage drops too far...
 

James

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Mentor
Arms
Supporter
Esteemed
I agree that the battery is very small Charlie... needs a bigger one for sure... and I'd want something to disconnect the battery once it's voltage drops too far...
I would be looking at 100Ah to 200Ah leisure battery as this will be able to accept the full 8A of charge current from solar panel without problems.
also, 50W pump will draw 4 Amps approximately,
this equates to 96Ah if left on 24 hours.

if you get 10 hours of sunlight at 80% of the panels full rating that equates to 67Ah of charge.

you either need a timer to run the pump only for 12 hours a day maximum or twice as much solar panel area to stand a chance.
 

PEG

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Mentor
Arms
Esteemed
Hi,what is the pump doing,exactly?

I would be looking to reduce that pump load....it's using the same as one car headlamp :)
 
t is just like the traditional electric pump with the only exception that it uses solar. It consists of one or more solar panels, also known as solar photovoltaic. Incurs low maintenance costs as solar water pumps have fewer moving parts as. If it is an open well, pond, etc, then usinga surface pump is better. We solar rooftop system dealers to solve those problems
 

bigspark17

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Arms
I recommend;
Replace the 9Ah battery for a leisure battery.
Install a change over switch, don’t be running the pump whilst charging the battery
Agree with changing the battery, dont see the point of using that size battery,
Dont agree with the changeover switch.
 

Strima

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Arms
Esteemed
If it's a cheap controller there might be a diode between the + and - outputs to detect reverse polarity and protect against short circuit.

If this diode has been subject to a high current fault it may have blown.

As suggested can you post a picture of your wiring diagram?
 

Charlie_

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Arms
Agree with changing the battery, dont see the point of using that size battery,
Dont agree with the changeover switch.
If it’s a big enough battery it doesn’t need to be charging whilst running the pump. The change over switch will just switch the pump on whilst taking the battery off charge
 
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