It depends on the model but varies from one brand to another and by the UPS converter design. You'll have to calculate the power loss measuring the current drawn from the batteries with the UPS on back-up and with a known load on the output.
The UPS inverter circuit is pretty inefficient so it may consume more than 30% of the output power.
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Malfunction of input circuit: voltage delivered is too low. The batteries may
be faulty or depleted. Wait for a few hours, leave the UPS switched on
If absence of input power (utility failure, maintenance work) is expected to last longer than a few hours, switch
off the UPS to save battery power. If the UPS input power is absent for several days and the UPS remains on
under no-load conditions, the batteries can be discharged very deeply, resulting in a short battery life time
Hi, interesting question....
If you have access to a large enough solar system, then as long as there is sufficient power from the inverter, it will work as the UPS will consider it is being powered by a mains source.
The amount of power you will need from the SS will directly depend on how much load you have on your UPS.
Remember that you will need enough power from the SS to drive the
1) UPS electronics
2) UPS battery charger
3) Load items
The symptom can occur if the load is too large. It will also happen when the unit reaches a certain age.
I've found that the low-end consumer UPS's should be replaced when the battery fails. The charging circuitry usually fails to charge the battery even with a new battery soon after the replacement.
The way I check if the battery or the UPS charging system has failed is with a voltmeter to give the current voltage and a variable DC power supply (whatever is appropriate for the battery) to attempt to charge the battery. I can watch the battery discharge with an oscilliscope if I want a full trace of the unit.) Charge the battery fully then watch the unit over time. If the battery itself is bad, you won't get the full charge or it will discharge as soon as it is removed from the power supply.
I hope this helps.
Cindy Wells (the server UPS's tend to be a better choice if you want to replace the battery and keep the UPS.)
The amount of time your UPS gives you power decrease over time ( the battery is getting "old" ). If the UPS is new, check the characteristics and see the table with times and powers. Example : 5 minutes for a full 450 W and 10 minutes for 150W. So the more consumers you have the less time your UPS will stand.
It sounds like you have a computer with an Active PFC (Power Factor Correction) Power Supply.
Back-UPS units, when running on battery power, output a Modulated / Stepped Sign Wave. Active PFC Power Supplies are NOT compatible with this pseudo-sign wave power, which is the reason it will not stay running.
You need a Smart-UPS unit, capable of delivering a true sign wave when on battery output.
Batteries in the UPS typically last 3 to 5 years and it depends upon several factors. including the number of times the unit must go on battery power and environmental conditions. There are usually several batteries in the UPS and while the battery voltage may show 13 volts, this may only be a float charge/voltage and a true indication of the battery voltage and condition requires the batteries to be tested under a load. There maybe one battery in a set of batteries that is faulty and causes the whole battery system to fail and indicate a battery fault. These lower powered and cheaper KVA type UPS are switch over types, when the mains supply fail, the UPS switches over to the inverter in milli-seconds which then supplies mains power but the power waveform is a pseudo sine wave (ie not a true sinewave. A faulty inverter circuit won’t deliver power when the mains supply fails.
Batteries in the UPS typically last 3 to 5 years and it depends upon several factors. including the number of times the unit must go on battery power and enviromental conditions. There are usually several batteries in the UPS and while the battery voltage may show 13 volts, this may only a float voltage and a true indication of the battery voltage needs the batteries to be tested under a load. there maybe one battery that is faulty and causing the whole battery system to fail.
These lower powered and cheaper KVA type UPS are switch over types (when the mains fail, the UPS switches over to the inverter in milli-seconds to supply mains power). It is a possibility the inverter circuit is faulty and when the mains power fails the inverter does not switch over.
The true UPS type are usually the higher KVA units (over 1500 KVA units) that converts mains power continuously via the inverter circuit. The mains power charges the batteries and the inverter drawing power from continuously from the batteries (therefore there is no switch over time lag from the mains to the battery.
The UPS can temporarily provide power to IT hardware in the event of a disruption to the Mains power supply. The UPS should stay powered up for long enough to enable the hardware it is protecting to be powered down in a controlled manner, before shutting off itself. The 5 minute period seems reasonable for such a task (although significantly less than the rated time), and if at any point within that period the Mains power supply comes back online, the hardware could continue to work.
I note that this particular model is supposed to provide battery power for 85 - 95 minutes. The amount of time it can supply regulated voltage for will depend upon the load placed upon it. The greater the load (in terms of current drawing devices), the shorter the amount of time that the UPS will be able to provide power.
There may be a Manufacturer Limited Warranty period (parts): 2 years for this model, although labour charges will probably be made.