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small garage solar project
#1
Hi, I'm having trouble with a small project I've been working on.  I have a 10w solar panel going through a cheap chinese 12v/10a charge controller into a 12v/24ah lead acid battery.  I then have a cheap chinese 12v to 220-240v inverter with 2x 36w LED strip lights connected via a standard (UK) 3 pin plug. 

Whenever I switch to lights on, they come on for half a second, then go off.  I've made sure the battery is fully charged, and I've tried a standard lead-lamp, but the same thing happens.

Anything obvious that I'm missing?

Thanks
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#2
What wattage rating is the inverter ?

Can measure 240v ish on its output unloaded ?
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#3
I'd say the inverter is toast. Possibly a short in one, or more, of the FETs, or a blown capacitor.

Which chinesium devices do you have (both devices, to help us understand better your setup)?
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#4
(07-16-2019, 01:32 PM)Sean Wrote: What wattage rating is the inverter ?

Can measure 240v ish on its output unloaded ?

Hi, thanks for your replies.  The inverter is rated at 1950w, although I was using a little 100w inverter that somebody gave me, and that did the same thing.  There is a guage on the new inverter that reads 240v ish when unloaded.

I've attached photos.

I've been collecting 18650s for a while and wanted to do a little garage light project before I start the big one!
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#5
Is the inverter connected directly to the batteries, or is it connected to the load output on the charge controller (the Light bulb symbol)? If you are connecting through the charge controller, it's possible, most likely, the controller is overloading and shutting down.
Connect the inverter directly to the batteries, if you haven't already.

Those cheap controllers usually can't handle a high amp spike. The amps will ramp up momentarily when the lights, or other load, is connected to the inverter.
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#6
You don't say if it has ever worked? Running a big inverter like that and taking 72W of lights is a lot. So without more info best guess is when the inverter starts draining the battery the voltage dips below it's cutoff voltage and turns the inverter off. Troubleshoot one thing at a time. Plug the inverter into your car battery, and see if that works. Then work backwards and plug a voltmeter on your solar battery to see if your voltage ever dips below 11V. Try a smaller load?
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#7
Thanks, I'll try those things, hopefully tomorrow.
Thanks again chaps
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#8
So I've finally got around to doing some troubleshooting. I've connected the battery straight to the inverter and plugged my LED strip lights into it. This works fine. I've measured 12.8v on the load output of the charge controller.

If I connect the charge controller to the inverter it still powers my lights for half a second then trips out the inverter.

Any suggestions please?
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#9
(07-24-2019, 10:40 AM)Kenbat Wrote: So I've finally got around to doing some troubleshooting.  I've connected the battery straight to the inverter and plugged my LED strip lights into it.  This works fine.  I've measured 12.8v on the load output of the charge controller.

If I connect the charge controller to the inverter it still powers my lights for half a second then trips out the inverter.

Any suggestions please?



Are you connecting the inverter to the Yellow circle connectors, or the Red circle? If the Red, then this is why you are having issues. That is a very low current circuit in the controller. That's not the full load circuit.
Connect the inverter directly to the batteries and let the charger controller only control the charge to the batteries.
Even though the controller "says" that those connectors are for the load, they can't handle the amp draw the inverter pulls on surge. That port would work just fine for non-surge devices like lights, USB chargers, small DC fans, etc.
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#10
Thanks so much for your help, I will try that.  Just waiting for it to cool down a little it's 31 degrees c here.  Not used to it in the UK!

That worked a treat, thanks very much for your help Korishan. Onwards and upwards!
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