| SR-700 | DC-100/600 | DA-300/600/1200 | BC/SC/MU Battery Charger |
| DA-300/600/1200 | |||||||||||||||||||||||||
| Q1. |
Why there is always low input voltage alert or alarm but the battery is full? |
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| A1. |
Use larger input cable size and shorten its length as the voltage drop across the input cables affect the sense voltage at the input of the inverter. Especially under heavy loading condition. |
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| Q2. |
What cable size should be used? |
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| A2. |
In order to reduce the voltage drop across the input cables, following minimum cable sizes of about 1 metres are recommended for different inverters.
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| Q3. |
Can the inverters connect to common electrical/electronic appliances? |
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| A3. |
DA series inverters are MCU based inverters with digital contorl. This enhances the implementation of modified sine output with higer line fundamental frequency (50Hz/60Hz) component. It is suitable for most electrical/electronic appliances such as flourescent lamps with standard ballast or electronic ballasts, electric hand-drills, electric fans, heaters, hair dryers, heat guns, pumps, etc.. The maximum current linear derating factor is approximately 1A/deg C. |
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| Q4. |
How to calculate the output power for specific loading? |
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| A4. |
It is easier to calculate the output power for resistive load such as heaters and light bulbs . More attention must be paid on inductive and capacitive load (i.e. power factor is not equal to one) such as flourescent lamp with standard ballast and motors. It is better to use only about half the rated power of the inverter for inductive or capacitive load. Below is a typical example for DA-300-12-2 to power flourescent lamps with standard ballasts.
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| Q5. |
Why the inverter always OVP? |
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| A5. |
OVP is activated when a high voltage is detected at the output of the inverter. It usually happens under inductive load and load with switching cuurent. The problem may be solved by shorten the output cable connecting to the load. |
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| Q6. |
What is the body temperatuer of the inverter at rated output power? |
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| A6. |
The body temperature is about 25 deg. C above ambient temperature at rated output power. |
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| Q7. |
Why a DA-300 inverter cannot start with a 12V 30A power supply under full load condition? |
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| A7. |
Power supply with current limit decreases its output voltage when the drawn current exceeds its limit. Under full load condition, the surge current can be several times that of the steady current. This activates the current limit of the supply and triggers the under voltage protect of the inverter. It is recommended to use batteries to power the inverter. |
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| Q8. |
Why the input terminals of the inverter get hot? |
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| A8. |
The contact resistance between the input cables and the input terminals of the inverter is too large. Always connect the input cables with tags of large surface areas. Do not just strip the cables and wrap them on the terminals. |
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| Q9. |
Where should the earth/ground wire of the electric appliance be connected to? |
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| A9. |
Since the inverter is powered by DC power, therefore there is no earth/ground connection for electric appliance. Just leave the earth/ground wire unconnected. |
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| Q10. |
How to identify the live and neutral terminals from the output of the inverter? |
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| A10. |
There is no need to identify between live and neutral terminal at the output of the inverter. |
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| Q11. |
Will the inverter be damaged with wrong dc input polarity? |
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| A11. |
The inverter is protected against wrong dc input polarity. It will not function when the input is connected wrongly. |
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| Q12. |
Can several inverters be connected in parallel or series? |
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| A12. |
Do not connect two or more inverters in parallel or series as they are not synchronized. This will damage the inverters. |
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| Q13. |
What is the advantage of digital control inverter as compare with the analogue one? |
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| A13. |
Digital control inverters are more robust. They can withstand more serve and varying loading condtions as compare with the analogue inverters. Also they are more stable under the software control. |
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| Q14.. |
How to calculate the capacity of the battery for a known loading? |
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| A14. |
It is very difficult to calculate the capacity (AH) of the battery used for a specified load because it is depended on the battery conditon. A typical example for rated output powers with 160AH 12V and 24V batteries are for reference.
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