Product FAQ
Title: HOW TO CHOOSE THE RIGHT BATTERY?
Introduction:Inverters should be operated on batteries of appropriate size. The battery should be cycle proof. Generally for lead acid batteries: the shorter the discharge time, the lower the energy usable. E.g.: If a battery can deliver 10 Amps for 10 hours, it will deliver 100 Amps only for 20-30 minutes. You should choose the battery size for an operation time of several hours with your estimated load. Additionally you should only allow for a discharge down to 60 to 70% of full capacity in order to increase battery lifetime. E.g: Lifetime of a battery may be 5000 discharge cycle with 20% discharge per cycle. The same battery will only live for approximately 2000 discharge cycles if every cycle is 40% discharge.
Introduction:Inverters should be operated on batteries of appropriate size. The battery should be cycle proof. Generally for lead acid batteries: the shorter the discharge time, the lower the energy usable. E.g.: If a battery can deliver 10 Amps for 10 hours, it will deliver 100 Amps only for 20-30 minutes. You should choose the battery size for an operation time of several hours with your estimated load. Additionally you should only allow for a discharge down to 60 to 70% of full capacity in order to increase battery lifetime. E.g: Lifetime of a battery may be 5000 discharge cycle with 20% discharge per cycle. The same battery will only live for approximately 2000 discharge cycles if every cycle is 40% discharge.
Title: How long can equipment on a UPS keep running after the power goes off?
Introduction:It depends on how big a UPS do you have and what kind of equipment it protects? For most typical computer workstations, one might have a UPS that was rated to keep the machine alive through a 15 minute power loss. If you need a machine to survive hours without power, you should probably look at a more robust power backup solution. Even if a UPS has a very small load, it must still operate it's DC (battery) to AC converter, which costs power.
Introduction:It depends on how big a UPS do you have and what kind of equipment it protects? For most typical computer workstations, one might have a UPS that was rated to keep the machine alive through a 15 minute power loss. If you need a machine to survive hours without power, you should probably look at a more robust power backup solution. Even if a UPS has a very small load, it must still operate it's DC (battery) to AC converter, which costs power.
Title: WHAT IS COS PHI?
Introduction:With heavy inductive loads the product V*1 ( VA on AC side) is much larger than the actual watts delivered. E.g. Inductive motors, fluorescent lamps, etc. This means some of the energy is stored in the inductivity of the load and then flows back to the battery. These inductive currents cause heat dissipation in the power semiconductors and in the cables as well. As the capacity is used up for reactive currents, there is "no room" for active currents.
Introduction:With heavy inductive loads the product V*1 ( VA on AC side) is much larger than the actual watts delivered. E.g. Inductive motors, fluorescent lamps, etc. This means some of the energy is stored in the inductivity of the load and then flows back to the battery. These inductive currents cause heat dissipation in the power semiconductors and in the cables as well. As the capacity is used up for reactive currents, there is "no room" for active currents.
Title: w are the
Introduction:Typically, a UPS has a VA rating. The VA rating is the maximum number of Volts * Amps it can deliver. The VA rating is not the same as the power drain (in Watts) of the equipment. Computers are notoriously non-resistive. A typical PF (power factor: Watts/VA) for workstations may be as low as 0.6, which means that if you record a drain of 100 Watts, you need a UPS with a VA rating of 167. Some literature suggests that 0.7 may be a good conversion factor, but this will depend heavily on the machine.
Introduction:Typically, a UPS has a VA rating. The VA rating is the maximum number of Volts * Amps it can deliver. The VA rating is not the same as the power drain (in Watts) of the equipment. Computers are notoriously non-resistive. A typical PF (power factor: Watts/VA) for workstations may be as low as 0.6, which means that if you record a drain of 100 Watts, you need a UPS with a VA rating of 167. Some literature suggests that 0.7 may be a good conversion factor, but this will depend heavily on the machine.
Title: WHY DOES MY 600VA INVERTER NOT WORK ON A LOAD DECLARED 600W?
Introduction:With inductive loads the VA value is bigger than the Watts value. E.g. 600W load, cos phi 0.6 results in 1000VA!
With motors often the mechanical output is declared so the VA rating is even higher.
Another cause for malfunction is inrush currents (5 to 10 times nominal current with motors).
Introduction:With inductive loads the VA value is bigger than the Watts value. E.g. 600W load, cos phi 0.6 results in 1000VA!
With motors often the mechanical output is declared so the VA rating is even higher.
Another cause for malfunction is inrush currents (5 to 10 times nominal current with motors).
Title: What is the benefits of a UPS?
Introduction:A UPS has internal batteries to guarantee that continuous power is provided to the equipment even if the power supply stops providing power.
Advantages:
1. Computer jobs don't stop in case of the power failure.
2. Users do not inconvenienced when computer is out of power.
3. Equipment does not incur the stress of another (hard) power cycle.
4. Data isn't lost because a machine shut down without doing a "sync" or equivalent to flush cached or real time data.
Introduction:A UPS has internal batteries to guarantee that continuous power is provided to the equipment even if the power supply stops providing power.
Advantages:
1. Computer jobs don't stop in case of the power failure.
2. Users do not inconvenienced when computer is out of power.
3. Equipment does not incur the stress of another (hard) power cycle.
4. Data isn't lost because a machine shut down without doing a "sync" or equivalent to flush cached or real time data.
Title: WHAT IS A TRUE SINE WAVE INVERTER?
Introduction:The pure sine wave is a "natural" waveform as created by any power station available at your home wall socket.
ANY MAINS LOAD AVAILABLE WAS CREATED FOR USE WITH SINE WAVE ELECTRICITY!
Sine wave inverters are more complicated to build thus resulting in increased manufacturing costs. The sine wave shape is synthesized by an additional PWM filter at the output of the inverter. Idle consumption is slightly higher than square wave inverters. The biggest advantage is found in the high efficiency and hassle free operation of almost any load.
MORE TECHNICAL DETAILS (OVERVIEW):
50/60Hz technology: Isolation and voltage step between DC and AC side is achieved by iron transformers. Very high safety standard. Increased lifetime due to reduction of semiconductors. Battery acts as storage for reactive currents. The only disadvantage is high weight of iron transformers.
High frequency technology: These units utilize a HF transformer for isolation/voltage step. Reduction of weight but increased number of electronic parts. Efficiency is similar to 50/60 Hz technology with resistive loads but there is no chance to use the battery as storage for inductive currents. Loads with low cos phi can cause problems.
High frequency inverters without isolation between DC/AC: Only used in cheap products. Not recommended for safety reasons, no up to date technology.
Introduction:The pure sine wave is a "natural" waveform as created by any power station available at your home wall socket.
ANY MAINS LOAD AVAILABLE WAS CREATED FOR USE WITH SINE WAVE ELECTRICITY!
Sine wave inverters are more complicated to build thus resulting in increased manufacturing costs. The sine wave shape is synthesized by an additional PWM filter at the output of the inverter. Idle consumption is slightly higher than square wave inverters. The biggest advantage is found in the high efficiency and hassle free operation of almost any load.
MORE TECHNICAL DETAILS (OVERVIEW):
50/60Hz technology: Isolation and voltage step between DC and AC side is achieved by iron transformers. Very high safety standard. Increased lifetime due to reduction of semiconductors. Battery acts as storage for reactive currents. The only disadvantage is high weight of iron transformers.
High frequency technology: These units utilize a HF transformer for isolation/voltage step. Reduction of weight but increased number of electronic parts. Efficiency is similar to 50/60 Hz technology with resistive loads but there is no chance to use the battery as storage for inductive currents. Loads with low cos phi can cause problems.
High frequency inverters without isolation between DC/AC: Only used in cheap products. Not recommended for safety reasons, no up to date technology.
Didn't find what you're looking for? Post a buying lead.
Company Info
Zhejiang PGEPS Power Science Technology Co., Ltd.
[China]
[Verified Member]
City: Wenzhou
Province/State: Zhejiang
Country/Region : China
Business Type:Manufacturer
Online Postings: Products