240v inverter

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Re: Battery

Postby lantern » Fri Feb 10, 2017 7:23 am

Put your hand on the battery terminals, one by one, if one is warmer then the rest you will have found the problem.
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Re: Battery

Postby cfinlay96 » Fri Feb 10, 2017 9:28 am

The batteries aren't very old. And I still get quite a lot of power out of it, maybe not quite what it is rated at but it all just seems to be down near the 23 v mark which makes me think he batteries won't last long
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Re: 240v inverter

Postby cfinlay96 » Fri Feb 10, 2017 9:33 am

I will check all connections, but I'm pretty sure they are pretty secure. I only have the fridge running full time through the day, and even on the sunniest days when I'm getting full power it still does it. I was wondering could it be an earthing problem?
It doesn't effect the voltage of the batteries at all when it cuts out.
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Re: 240v inverter

Postby cfinlay96 » Fri Feb 10, 2017 9:44 am

And it is a Giandel pm-2000QAR
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Re: Battery

Postby jules » Fri Feb 10, 2017 9:46 am

What configuration of batteries are you using, as in 12 X 2V, 2 X 12V or something else?

If your regulator has a meter to tell you voltage at any given instant you might notice during charging [with a constant level of sunlight and no clouds], some small fluctuations up and down. This is a fair indicator that one cell is having some internal problems, while the regulator will do it's best to keep the total voltage where it wants it. If you've got a meter you might be able to pick a failed cell even with the whole set connected. It can be at a lower voltage than the rest [in which case the regulator will ask the rest of the set to achieve a higher total individually and combined] or again, it could fluctuate. If it does, the fluctuations can be quite significant. I had a failed cell in my set that ranged from close to 0 volts to nearly 5 volts.
Last edited by jules on Fri Feb 10, 2017 10:06 am, edited 2 times in total.
Primary system: .8KW Trina panels; Plasmatronics PL40; 1,000Ah VRLA 12X2V battery bank; 1.7KW Selectronic inverter

Veteran system, semi retired: 6 X 55W Solarex 12V panels; Fangpusun CC; 6 X 2V, 35 year old 550Ah lead acid flooded cell batteries.
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Re: Battery

Postby APR » Fri Feb 10, 2017 9:59 am

What voltage do you see for each battery? I expect you will see one battery around 12.5 to 12.8 volt and the other around 10.5 volt when lightly loaded, and as others have suggested, it sounds like one cell is kaput.
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Re: Battery

Postby cfinlay96 » Fri Feb 10, 2017 10:10 am

On my regulator it shows the complete voltage and it doesn't fluctuate at all during any charging. During the discharge it drops to 23.5ish and from then on it is a slow steady drop.
I've got 4 x 24 v batteries wired in 24v
I'll try test individually and see what battery's say
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Re: 240v inverter

Postby Gordon-Loomberah » Fri Feb 10, 2017 10:17 am

hmmm, $149.99 for a 2kW inverter!

It has a no load current draw of 1.5-2A, so up to 50W draining from your battery even when nothing is running- that's a lot of wasted energy you have to account for. I suspect your batteries have suffered from periods of chronic undercharging, which could account for a bad cell.
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Re: Battery

Postby jules » Fri Feb 10, 2017 10:26 am

Sorry, I was presuming they were in series. You'll need to disconnect them from each other to measure the voltage when they're in parallel. Parallel connection is less than ideal as it can allow differences to develop between batteries which are then exacerbated in the sense that a battery [or batteries] can become a sort of backwater, so they don't get charged properly.

At 23.5V you're down to approx 30% but I think you'll find variation between the batteries.
Primary system: .8KW Trina panels; Plasmatronics PL40; 1,000Ah VRLA 12X2V battery bank; 1.7KW Selectronic inverter

Veteran system, semi retired: 6 X 55W Solarex 12V panels; Fangpusun CC; 6 X 2V, 35 year old 550Ah lead acid flooded cell batteries.
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Re: Battery

Postby cfinlay96 » Fri Feb 10, 2017 10:56 am

Yea I know it's not ideal but it's just what I could do at the time :/
I'll have a look and get back to you
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