If the batteries are in series the voltage is 24V but the current is still 7A. It doesn’t halve, it is the same. It doubles if you connect the batteries in parallel i.e. 14A but then the voltage stays at 12V.
If the load is 110W @ 24V this equals 4.58A so theoretically it should last for about 1.5 hours. But in real life the voltage starts to drop as the batteries are being used and it may get to a point where there is insufficient voltage not current.
It may be that you have 1 faulty battery that is failing under load or is faulty but usually most UPS run for only about 5-10 minutes so yours is probably OK They’re primarily designed to give enough time to save any work that is open and to shut down safely or to cover unstable mains power supplies not to keep working for hours on end.
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Try placing an ammeter in series with one leg of the supply to the load and actually measure the current and what happens to it. Also connect a voltmeter across the output and check what happens to the voltage. At least you’re seeing real world values rather than just theoretical ones. Just what I’d try.
If the batteries are in series the voltage is 24V but the current is still 7A. It doesn’t halve, it is the same. It doubles if you connect the batteries in parallel i.e. 14A but then the voltage stays at 12V.
If the load is 110W @ 24V this equals 4.58A so theoretically it should last for about 1.5 hours. But in real life the voltage starts to drop as the batteries are being used and it may get to a point where there is insufficient voltage not current.
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It may be that you have 1 faulty battery that is failing under load or is faulty but usually most UPS run for only about 5-10 minutes so yours is probably OK They’re primarily designed to give enough time to save any work that is open and to shut down safely not to keep working for hours on end.
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It may be that you have 1 faulty battery that is failing under load or is faulty but usually most UPS run for only about 5-10 minutes so yours is probably OK They’re primarily designed to give enough time to save any work that is open and to shut down safely or to cover unstable mains power supplies not to keep working for hours on end.
Try placing an ammeter in series with one leg of the supply to the load and actually measure the current and what happens to it. Also connect a voltmeter across the output and check what happens to the voltage. At least you’re seeing real world values rather than just theoretical ones. Just what I’d try.
If the batteries are in series the voltage is 24V but the current is still 7A. It doesn’t halve, it is the same. It doubles if you connect the batteries in parallel i.e. 14A but then the voltage stays at 12V.
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If the load is 110W @ 24V this equals 4.58A so it should last for about 1.5 hours. But in real life the voltage starts to drop as the batteries are being used and it may get to a point where there is insufficient voltage not current.
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If the load is 110W @ 24V this equals 4.58A so theoretically it should last for about 1.5 hours. But in real life the voltage starts to drop as the batteries are being used and it may get to a point where there is insufficient voltage not current.
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It may be that you have 1 faulty battery that is failing under load or is faulty.
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It may be that you have 1 faulty battery that is failing under load or is faulty but usually most UPS run for only about 5-10 minutes so yours is probably OK They’re primarily designed to give enough time to save any work that is open and to shut down safely not to keep working for hours on end.
Try placing an ammeter in series with one leg of the supply to the load and actually measure the current and what happens to it. Also connect a voltmeter across the output and check what happens to the voltage. At least you’re seeing real world values rather than just theoretical ones. Just what I’d try.
If the batteries are in series the voltage is 24V but the current is still 7A. It doesn’t halve, it is the same. It doubles if you connect the batteries in parallel i.e. 14A but then the voltage stays at 12V.
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If the load is 110W @ 24V this equals 4.58A. But in real life the voltage starts to drop as the batteries are being used and it may get to a point where there is insufficient voltage not current.
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If the load is 110W @ 24V this equals 4.58A so it should last for about 1.5 hours. But in real life the voltage starts to drop as the batteries are being used and it may get to a point where there is insufficient voltage not current.
It may be that you have 1 faulty battery that is failing under load or is faulty.
Try placing an ammeter in series with one leg of the supply to the load and actually measure the current and what happens to it. Also connect a voltmeter across the output and check what happens to the voltage. At least you’re seeing real world values rather than just theoretical ones. Just what I’d try.
If the batteries are in series the voltage is 24V but the current is still 7A. It doesn’t halve, it is the same. It doubles if you connect the batteries in parallel i.e. 14A but then the voltage stays at 12V.
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If the load is 110W @ 24V this equals 4.58A so theoretically this is 65% of the available current supply for 1 hour, so it should last for ~39 minutes. But in real life the voltage starts to drop as the batteries are being used and it may get to a point where there is insufficient voltage not current.
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If the load is 110W @ 24V this equals 4.58A. But in real life the voltage starts to drop as the batteries are being used and it may get to a point where there is insufficient voltage not current.
It may be that you have 1 faulty battery that is failing under load or is faulty.
Try placing an ammeter in series with one leg of the supply to the load and actually measure the current and what happens to it. Also connect a voltmeter across the output and check what happens to the voltage. At least you’re seeing real world values rather than just theoretical ones. Just what I’d try.
If the batteries are in series the voltage is 24V but the current is still 7A. It doesn’t halve, it is the same. It doubles if you connect the batteries in parallel i.e. 14A but then the voltage stays at 12V.
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If the load is 110W @ 24V this equals 4.58A so theoretically this is 65% of the available current supply so it should last for ~39 minutes. But in real life the voltage starts to drop as the batteries are being used and it may get to a point where there is insufficient voltage not current.
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If the load is 110W @ 24V this equals 4.58A so theoretically this is 65% of the available current supply for 1 hour, so it should last for ~39 minutes. But in real life the voltage starts to drop as the batteries are being used and it may get to a point where there is insufficient voltage not current.
It may be that you have 1 faulty battery that is failing under load or is faulty.
Try placing an ammeter in series with one leg of the supply to the load and actually measure the current and what happens to it. Also connect a voltmeter across the output and check what happens to the voltage. At least you’re seeing real world values rather than just theoretical ones. Just what I’d try.
If the batteries are in series the voltage is 24V but the current is still 7A. It doesn’t halve, it is the same. It doubles if you connect the batteries in parallel i.e. 14A but then the voltage stays at 12V.
If the load is 110W @ 24V this equals 4.58A so theoretically this is 65% of the available current supply so it should last for ~39 minutes. But in real life the voltage starts to drop as the batteries are being used and it may get to a point where there is insufficient voltage not current.
It may be that you have 1 faulty battery that is failing under load or is faulty.
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Try placing an ammeter in series with one leg of the supply to the load and actually measure the current and what happens to it. At least you’re seeing real world values rather than just theoretical ones. Just what I’d try.
+
Try placing an ammeter in series with one leg of the supply to the load and actually measure the current and what happens to it. Also connect a voltmeter across the output and check what happens to the voltage. At least you’re seeing real world values rather than just theoretical ones. Just what I’d try.
Hi @vertinhol
I think your calculations are a bit incorrect.
If the batteries are in series the voltage is 24V but the current is still 7A. It doesn’t halve, it is the same. It doubles if you connect the batteries in parallel i.e. 14A but then the voltage stays at 12V.
If the load is 110W @ 24V this equals 4.58A so theoretically this is 65% of the available current supply so it should last for ~39 minutes. But in real life the voltage starts to drop as the batteries are being used and it may get to a point where there is insufficient voltage not current.
It may be that you have 1 faulty battery that is failing under load or is faulty.
Try placing an ammeter in series with one leg of the supply to the load and actually measure the current and what happens to it. At least you’re seeing real world values rather than just theoretical ones. Just what I’d try.
Cheers