Mecer 2400VA Inverter (Community Support) - Part 2

AviM said:
Yes. I am getting through 2 hours of loadshedding comfortably with 75% battery still remaining which is normal for the setup since i had it. What I do notice is that the display on the inverter hovers between 75 and 100% (changes at random) when in battery mode - this is something it never did before. Checked the batteries with a multimeter and I 25+ volts. Tested the batteries separately and they both around 12.9 volts each. The battery shop tested them under load and they say both batteries are fine which is what is puzzling me.

I think that maybe I need to take the batteries to another battery shop for a second opinion in the morning.
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What is the voltage when its not stopping charging?
 
wingnut771 said:
What is the voltage when its not stopping charging?
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around 26 volts. Max 27 odd volts.

In fact the day it got really hot - I switched everything off, disconnected it and also tested each battery individually the same time and the and one battery was 13.1 volts and the other 13 volts - both tied up to the 26 volts that I got before I separated the batteries.
 
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AviM said:
Yes. I am getting through 2 hours of loadshedding comfortably with 75% battery still remaining which is normal for the setup since i had it. What I do notice is that the display on the inverter hovers between 75 and 100% (changes at random) when in battery mode - this is something it never did before. Checked the batteries with a multimeter and I 25+ volts. Tested the batteries separately and they both around 12.9 volts each. The battery shop tested them under load and they say both batteries are fine which is what is puzzling me.

I think that maybe I need to take the batteries to another battery shop for a second opinion in the morning.
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Then it does sound like the inverter could be faulty, there are charging controller mudules you can buy to regulate charging.
 
AviM said:
around 26 volts. Max 27 odd volts.

In fact the day it got really hot - I switched everything off, disconnected it and also tested each battery individually the same time and the and one battery was 13.1 volts and the other 13 volts - both tied up to the 26 volts that I got before I separated the batteries.
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How long do you let it charge for before turning it off? It should charge to about 28.8V then float at 27.6V. Are you using 10 or 20A?
 
AviM said:
Yes. I am getting through 2 hours of loadshedding comfortably with 75% battery still remaining which is normal for the setup since i had it. What I do notice is that the display on the inverter hovers between 75 and 100% (changes at random) when in battery mode - this is something it never did before. Checked the batteries with a multimeter and I 25+ volts. Tested the batteries separately and they both around 12.9 volts each. The battery shop tested them under load and they say both batteries are fine which is what is puzzling me.

I think that maybe I need to take the batteries to another battery shop for a second opinion in the morning.
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What is the individual voltages when it is almost full , is just one boiling

ie balancing can cause this

If they differ , it might be the problem
As far as i have it the chargers tend to keep charging as long as the amps being pulled is more than x percentage of normal charging amps

And only go to float if drops below x
 
TheChamp said:
I did not go through all the spec, it's just an example, he will have to find one that's suitable for his application.

I still think one of his batteries is bad, not too many incidents of inverters going faulty like that.
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But why is run time still ok?
 
wingnut771 said:
But why is run time still ok?
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Yea maybe as champ says

One battery is maybe lower SOC stuffing up charging but still full enough to carry the load without shutdown

But the one is thus being abused below 50%soc at the bottom and the other boiled at the top
 
wingnut771 said:
Who knows. I would be busy saving for 2 x 100Ah LFP (with balancer) and 24V PSW 3kW inverter with MPPT controller.
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If the premium of single 25.6v battery isn't big i would rather have that losing balancer
 
leon.davibe said:
Yea maybe as champ says

One battery is maybe lower SOC stuffing up charging but still full enough to carry the load without shutdown

But the one is thus being abused below 50%soc at the bottom and the other boiled at the top
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but they are both the same voltage.
 
wingnut771 said:
but they are both the same voltage.
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I don't know lead acid that well

But just assumed that a persin may find similar behaviour to other batteries ie that one peaks earlier under charging hence why i suggested check when almost full
 
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