3000W load with a large number of UPS uninterruptible power supply is appropriate, the backup time to 12 hours
With a large amount of ups and the nature of the load is directly related to the start of the inductive load is often greater than the rated value is 4-7 times to start, your load is 3000, according to the minimum starting power multiplier count 3000 * 4 = 12000w, general ups power Is allowed to start super 1-1.5 times, so count, you need to be equipped with a minimum of more than 5000w ups power, the ideal equipment should be 10000w (10kw). If your load is of a resistive type, it is only necessary to match or slightly larger than that. If your inductive load is a number of monomers (such as 300w of 10 total of 3000w) and do not need to start at the same time, just equipped with a 4000 more than enough.
At present there is no one UPS power supply can meet the requirements of 12 hours back-up
The main function of the UPS power supply is to provide a stable voltage in the normal power supply, followed by a sudden power failure, the device from the AC power supply switching to DC power supply, a smooth voltage transition, at the same time, in a relatively short period of time for the equipment to provide electricity , For the start of standby power for valuable time
UPS power supply, although containing the battery, but just like the car's battery, just after the car stall to maintain the circuit standby, when the device is fully power when the battery is unable to provide long-term power
UPS power is currently only available for a few minutes of backup power, even the most expensive UPS used by very large servers, backup time is not more than 1 hour
For a 12-hour power-off period, it is necessary to equip the generator. The UPS can only start the time for the generator and not for a long period of unattended work
1 kWh = 1000 W / H (1 kW / hour)
So the theory is 3000W load 1 hour is 3 degrees electricity
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If you use a 12V battery for power supply.
Then the capacity required for 1 hour is 3000W / 12V = 125A.
12 hours is 1500A.
Theoretical value If you use 12V battery to do power supply, then the need for 1500A theoretical battery capacity.
This is also the UPS itself, the loss of the proposed increase to 2000A capacity.
According to your purchase of a single battery capacity. Perform the stack calculation.
You have to buy a little stability of the UPS head + battery pack program.
A brief introduction, my company has a small room, which is the program is to use SURT15K UPS head + a 1.2 cubic meters of the battery pack program (estimated to have 30 large batteries inside). Can provide 10 IBM X3550 server running about 10 hours.
General UPS load factor of 0.6-0.7 or so, the need to configure the 5KVA UPS was appropriate.
If the UPS is connected in series with 16 batteries, the rated voltage of the battery pack is 192V, the inverter battery discharge current is about 3000/192 / 0.85 = 18A, 0.85 is the inverter efficiency, 18 * 12 / 0.9 = 240Ah, 0.9 for the battery discharge efficiency. The actual configuration 120Ah * 16, 2 groups in parallel is enough.
General UPS load factor of 0.6-0.7 or so, the need to configure the 5KVA UPS was appropriate.
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If the UPS is connected in series with 16 batteries, the rated voltage of the battery pack is 192V, the inverter battery discharge current is about 3000/192 / 0.85 = 18A, 0.85 is the inverter efficiency, 18 * 12 / 0.9 = 240Ah, 0.9 for the battery discharge efficiency. The actual configuration 120Ah * 16, 2 groups in parallel is enough.
