VOLTWORKS VK300S User manual

MODEL:VK300S
Warning: This manual contains important safety and
operating instruction. Please read it carefully before
useing.
USER'S MANUAL
300W pure sine
wave inverter
V0.20.12

1. 2.
DC Input Voltage
Output Wave Form
Output Power
Output Voltage
Surge Power
Over Load power
Efficiency
No Load Current
Battery Low Alarm
Battery Low Shutdown
Input Over Voltage Shutdown
Operating Temperature
Over Temperature Protection
Intelligent Cooling Fan
USB Output
Internal DC Input Fuse
Power Switch
Cigarette Lighter Cable
Dimensions (LxWxH)
Net Weight
Data
D. FEATURES
Item
(Automatic Recovery/Shutdown)
DC 9.5 ± 0.5V
(Automatic Recovery at 12.5VDC)
DC16±0.5 V
(Automatic Recovery at 14VDC)
5 VDC, Max 4.8A(Dual 2.4A)
Automatic identification charging IC
12V (9.5-16V)
Pure Sine Wave(THD≤3%)
300W
AC110-120V 60Hz
600W for 40 milsec
400W±100W
about 90%
0.35A
DC 9.8 ± 0.3V
32-113° F
149° F ± 41° F
Must Be Fitted, Use 30A Maximum
ON/OFF Control
YES
6.9” x 4.3” x 1.9”
1.65 lb
The cooling fan on the product will not run when
start up the inverter, it will start running only when
temperature reach 104° F± 41° F or load over 100W
A. INSTRUCTION
The Power inverter product is used for back-up power. This pure sine product is ideal
for sensitive equipment and provides clean power, which is more efficient for back-up
power applications. It converts DC (direct current/car battery) power into AC (alternating
current) power that can be used for running a wide variety of tools and appliances under
rating power. This inverter is perfect for providing mobile power in cars, boats and work
trucks. The inverter can also be utilized as a back-up source of electricity in the event of
an electrical failure or for several off-grid applications such as camping or in your RV.
B. Please read this instruction manual carefully and make sure your inverter is
installed properly before using.
C. WARNING AND SAFETY
1) Read the manual before connecting this inverter and keep it for future reference.
2) While opening the product package, please check the integrity of the product and
accessories. If there is any problem, please do not use it.
3) While connecting and using for the first time, if there is smoke or explosion sound in
the product, please stop using immediately and disconnect the product from the
battery and electrical appliances. This may be caused by damage during the
transportation or due to moisture during storage in the warehouse before delivery.
Please contact your seller in time.
4) During daily use, if there is smoke or explosion sound in the product, please don’t
worry, this is due to the internal fuse protection of the product . Please do not
disassemble it by yourself. Please stop using the product immediately. Disconnect
the product from the battery and electrical appliances. Contact the seller in time and
only with seller’s agreement a hired professional personnel can disassemble the
product . Otherwise, it may cause electric shock, fire and serious personal injury
5) Do not put the inverter under direct sun light or near a heating source.
6) The case of inverter will get hot during using. Do not allow flammable materials such
as clothing, sleeping bags, carpet or any other flammable materials to touch the
inverter. The heat from the inverter can damage these items.
7) The power inverter is designed to be used with a negative ground electrical system!
Don't use with positive ground electrical systems (the majority of modern
automobiles, RVs, trucks and boats are negative ground).
8) Do not disassemble the unit randomly: it may cause fire or electric shock.
9) This device should only be serviced by a qualified technician. This item does not
have any serviceable parts.
10) Prevent body contact with grounded surfaces such as pipes, radiators, ranges, and
refrigerator enclosures during installation.
11) Do not operate the inverter if under the influence of alcohol or drugs. Read warning
labels on prescriptions to determine if your judgement or reflexes are impaired while
taking drugs. If there is any doubt, do not operate the inverter.
12) People with pacemakers should consult their physician(s) before using this product.
Electromagnetic fields in close proximity to a pacemaker could cause interference to
or failure of the pacemaker.
13) Keep the inverter well-ventilated. Do not place any objects on top of or next to the
inverter or allow anything to cover the cooling fans; inverter will bel overheating,
causing a potential fire hazard and/or damage to the inverter. Leave adequate
ventilation space underneath the inverter as well; thick carpets or rugs can obstruct
air flow, causing the inverter to overheat.
14) Avoid unintentional starting. Be sure the switch is in the OFF position when not in
use and before plugging in any appliance.
15) Keep inverter away from children. Don't install the inverter where it is accessible to
children.
16) The power inverter will output the same AC power as utility power, please treat the
AC outlets as carefully as you would your home AC outlets. Do not put anything
other than an electrical appliance into the output terminal. It may cause shock or
fire.
17) This product cannot be used for medical and life support equipment.

F. USING THE POWER INVERTER
1. Check the output voltage and capacity of the battery. The battery (s) should match the
voltage of the inverter and have enough capacity for the load.
2. Insert the cigarette plug into the car cigarette socket and ensure well connected.
3. Press the power switch button on your inverter and a green LED will light up indicating
that the inverter is on.
4. Before plugging anything into your inverter, make sure the appliance you are trying to
power is shut OFF, then plug it into the AC outlet of your inverter and power on your
appliance.
5. Once finished using the inverter, turn off your electrical appliance and the inverter. The
indicator lights should be off.
Warning: The car cigarette outlet usually has current limit requirements. It is
suggested that the continuous load power should not exceed 100W when the original
cigarette holder is supplied, otherwise the car built-in fuse may be burned. If more
power requested, a special cigarette outlet should be supplied to connect directly from
battery.
6. The inverter provides dual USB ports and stable 5V DC to the external device, the total
maximum current is 4.8A, and the maximum output current of a single USB port is
2.4A, which can directly supply or charge a portable device with a USB interface.
USB ports built-in automatic charging identification IC, support various charging
protocols.
G. BATTERY OPERATING TIME
Battery operating time depends on battery capacity and load. The formula for
Power switch
AC outlets
Power Indicator
USB ports
E. PARTS LIST
Cigarette Lighter
Cooling fan
Fuse holder
3. 4.
operating time is: battery capacity divided by the value of the load divided by battery
voltage times 110%. For example, using the numbers from above, the battery
specification is 12V,2*100Ah capacity and the load is 300W. Take battery capacity
200Ah*12/ 300 ≈8 hours of run time if you fully deplete the battery. This is NOT
recommended. Deep cycle batteries last longer when they are only depleted to 50% of
capacity
H. SOFT START TECHNOLOGY
The soft start technology built into this inverter protects the unit from delivering too
much AC power at once by gradually increasing the AC voltage pushed out. To make
sure that you are utilizing this feature, turn on the appliance being used before turning
on the inverter. This is especially necessary for equipment that has an inductive load or
electrical motor.
I. OUTPUT VOLTAGE AND WAVE FORM
The output wave form for this inverter is Pure Sine Wave, which is much like even more
pure than the one from utility-supplied AC electricity; pure sine wave is applicable in
lots of loads, such as Linear Adaptor, switching power supply, transformer, motor and
so on.
Comparing with Modified wave form, for inductive loads such as refrigerator and
electric fans, pure sine wave form can improve its power factor and the battery use
ratio and reduce effectively working noises from appliances. For sensitive loads such
as adapter of lap-top, pure sine wave can low down the rush current at working and
reduce interferences to increases reliability and the life of the product.
J. Protection Features
1. Input under-voltage alarm: When the input DC voltage is lower than 9.8V, the buzzer
will whistle intermittently to remind that the inverter will go into the under voltage
protection. Pay attention to save the data if you are using computer.
2. Under voltage protection: The inverter will automatically shut down when the input DC
voltage is lower than 9.5V. The buzzer will whistle continuously and the green light is
off, red light is on. Please turn off the inverter and use it after recharging the battery.
3. Over voltage protection: The inverter will automatically shut down when the input DC
voltage is higher than 16V.The buzzer will whistle continuously and the green light is
off, red light is on. Please turn off the inverter and adjust the input voltage to the
admissible range.
4. Overload protection: The inverter will automatically shut down when the load is higher
than the rated power. The buzzer will whistle continuously. Turn off the inverter and
resume to normal operation after taking away the excessive load.
5. Short-circuit protection: The AC output will be automatically shut down when short
circuited. It will automatically reset after the problem is solved.
6. Thermal protection: The unit will get hot during operation. If the temperature is higher
than 65℃, the inverter will automatically shut down. Then the buzzer will whistle
continuously and the green light is off, red light is on. Please turn off the inverter, and
continue using it after the temperature goes back to normal naturally. Meanwhile find
out the factors causing the fault, such as ventilation, ambient temperature, vent, load
power and so on. It can avoid similar things from happening again.

Welcome to use VOLTWORKS power inverter. If you have any query during using our
inverter, please contact our service team by email: [e-mail]
WARRANTY
This product is designed using the most modern digital technology and under
very strict quality control and testing guidelines. If however, you feel this product is
not performing as it should, please contact us
We will do our best to resolve your concerns. If the product needs repair or
replacement, make sure to keep your receipt/invoice, as that will need to be sent
back along with the package and prepaid.
This warranty is valid worldwide with the exception that freight and duty charges
incurred outside the contiguous 48 United States will be prepaid by customer.
Except as noted above, VOLTWORKS makes no warranty of any kind, express or
implied, including without limitation the implied warranties of merchantability and
fitness for a particular purpose. In no event shall VOLTWORKS be liable for indirect,
special or consequential damages. This warranty only applies to VOLTWORKS
branded products. All other name brand products are warranted by and according
to their respective manufacturer. Please do not attempt to return non-VOLTWORKS
branded products to us.
The following situations will void warranty:
1. The box is distorted, damaged or changed, and interior parts damaged because
of an exterior hit or drop not reported at time of delivery.
2. Connect the DC power incorrectly reversing the polarity.
3. Dismantled or repaired the unit by an unauthorized person.
4. The unit was damaged by incorrect installation or operating method.
For additional products, please visit our web site
-Modified sine wave inverters from 100W to 5000W
-Pure sine wave inverters from 200w to 5000W
5. 6.
K. HOW TO CHANGE FUSE：
1. Firstly disconnect the inverter and external batteries, solar panels, load etc all the
connections.
2. Unscrew the side plate screws and pull out the bottom plate.
3. Use pliers to clamp car fuse inside the product, and pull out.
4. Replace the same specifications of the car fuse, and then install the bottom and side
panels, and screw well. If the unit still doesn't work normally after using all the methods above, it maybe the
internal faults of the circuit. Please contactus after service.
L. TROUBLESHOOTING TIPS
No output voltage,
buzzer whistles
continuously
PROBLEM REASON SOLUTIONS
Low Input DC Voltage
High Input DC Voltage
Overload
Over temperature
● Do not use it when the battery is charging
● Check the rated voltage of the battery and
make sure that it is in the allowable range
ofthe input voltage.
Reduce the load power
● Cut off the load and let it cool naturally for
10 to 30 minutes.
● Restart it after it resumes to normal
temperature. Reduce the load. avoid
blocking the vent and improve the
ventilation condition.
No AC outputvoltage? 1.The power switch is off.
2.Poor contact with battery.
● Press the power switch for 1-2 second to
turn it on. it is a long press type switch
●Check the cables and make sure they are
tightly connected.
Output voltagebelow
100 V AC?
“True RMS”voltage meter is
required to properly measure
outputvoltage of modified
wave inverter
● Test output voltage with a True RMS meter
● Try to maintain the input voltage in the
range of rated power
● Change the battery of the meter then test
again.
Low Input DC Voltage
● Reduce the load power, or turn on the
appliance first, then turn on the inverter.
● Choose a bigger inverter
● Change a bigger battery and ensure fully
charged.
Cannot drive theload?
1.Load power is too large. Or the
actualpower of the appliance
exceedsnominal power.
2.The starting power is larger than
ratedpower (especially for
appliances withmotor)
3.Battery is too small.
Tester indicated
"Open Ground"?
This is because it is not connected
to a"true Earth ground ", meaning
it is not connected to a metal rod
stuck in theEarth. it would be
impossible to do so in a boat or
car while moving. The power
inverter DOES NOT and cannot
create a true Earth ground on its
own.
● Don't need the tester to do the Grounding
Test.
● Refer to the manual to do the Grounding
Starting alarm ?
The main reason is that ths
instantaneous current is too large,
which leads to the detection of low
voltage and trigger under-voltage
alarm.
Please restart the inverter several
times.
PROBLEM REASON SOLUTIONS
Got 40V or so while
testing inverter's
ground wire and
zero line?
This voltage has no
meaning, zero line can
be ground.
This is normal, there is no current
leakage.