- Lenmar Welding System User Manual
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Specifications: 
Model - NVD75 
Maximum output power  75W (15 min.) 
Surge output power  200W (5 sec.) 
Continuous output power  60W (4 hr.) 
Output frequency  60HZ+/-2HZ 
Output voltage range  105V-125V AC , Modified Sine Wave 
Input voltage range  11.5V-14V DC 
AC receptacle  1x 3 Prong Socket 
Dimensions   4.5 x 2.25 x 1.25 inches 
Model - NVD150S 
Maximum output power  150W (5 min.) 
Surge output power  200W (5 sec.) 
Continuous output power  140W (4 hr.) 
Output frequency  60+/-2HZ 
Output voltage range  105V-125V AC , Modified Sine Wave 
Input voltage range  11.5V-15V DC 
AC receptacle  1x 3 Prong Socket 
Dimensions   5.25 x 2.5 x 1.75 inches 
Model - NVD175X 
Maximum output power  175W (15 min.) 
Surge output power  300W (5 sec.) 
Continuous output power  140W (4 hr.) 
Output frequency  60+/-2HZ 
Output voltage range  105V-125V AC , Modified Sine Wave 
Input voltage range  11.5V-15V DC 
AC receptacle  1x 3 Prong Socket 
Dimensions   5 x 3.25 x 1.75 inches 
All units also incorporate low voltage shut-off, over voltage shut-off, over-heat 
protection and short-circuit protection. 
Limited 2 Year Warranty
This limited warranty starts from the date of original purchase and expires 
2 years  thereafter. If, during this  period, any part, because  of manufacturing 
defects or  workmanship fails  to function  properly under  normal use  will be 
repaired at no charge for parts and labor or, at our option, the product will be 
replaced.    The following is excluded: damages from delay or loss of use  of 
equipment,  or  damaged  batteries,  malfunctions  resulting  from  misuse, 
tampering,  unauthorized repairs, modifications, or  accident.  Package  the unit 
and its accessories carefully using ample padding material to prevent damage in 
transit and ship it prepaid and insured to:
LENMAR ENTERPRISES INC. USA 
4035 VIA PESCADOR
CAMARILLO, CA 93012
When sending in product for service you must first get a Return Authorization by 
visiting www.lenmar.com/warranty fill the out required form and our customer 
service reps will email you instructions on returning the item to us and issue a 
RETURN AUTHORIZATION NUMBER (RA) to be  include on the box and  any 
corresponding paper  work.  If you  have any questions please  call customer 
service at (805) 384-9600.
All packages should include evidence of the date of purchase. Enclose $10.00 for 
shipping and handling  for addresses in  the US and $15.00  for addresses in 
Canada. For outside the US and Canada, freight will vary depending upon the 
ship to address.
For further information contact
Lenmar Enterprises, Inc.
Product Service Department
Phone: (800) 424-2703
E-mail: sales@lenmar.com
Visit Our Web Site at: www.lenmar.com
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310-206-25-0506 r2 y2
Owner’s Manual for N-Verter Models
NVD75-75 Watt
NVD150S-150 Watt
NVD175X-175Watt
Mobile DC -AC Power Inverter Units
Read Carefully and Completely Before Using 
Efficient, quiet and portable 
Direct Plug-in design
Adapts to any size 12VDC accessory outlet 
Auto low battery shutdown to prevent battery damage
Lenmar offers innovative products for consumers and encourages the safe and proper 
use of each power accessory to achieve the maximum  performance of the product 
and the devices it powers. Read these instructions carefully to safely use your N-Verter.
Lenmar’s N-Verter is an electronic device that converts low voltage DC (direct current) 
electricity from  a  battery  to  110/120VAC (alternating  current)  standard household 
power. The AC output of this product is a modified sine wave with a voltage of 110/120 
volts. With your Lenmar N-Verter you can power your laptops, computerized games, 
cell phones, camcorders, power tools, reading lamps, fans, and more. 
Important: Before using your N-Verter, read and understand this owner’s guide. Save 
these instructions–this owner’s guide contains important safety instructions.
Safe Operating Guidelines 
WARNING! Shock hazard The N-Verter generates the same  AC power as a normal 
household wall outlet. 
Operate  only in  ventilated  area away from flammables, flames and  accumulating 
dangerous or explosive fumes 
Do not expose unit to water, rain or snow 
Always turn OFF unit by removing it from the DC cigarette lighter outlet when not in 
use 
Avoid exposure to direct sunlight and extreme temperatures (60-80°F or 15-25°C) 
Do not insert foreign objects into the outlet. 
Do not open the unit: no replaceable parts inside 
Consult  motor vehicle’s manual to  determine cigarette lighter  socket’s maximum 
power rating and fuse rating before attempting use in vehicle. 
Unit will not and should not operate heat-generating appliances such as hair-dryers, 
microwave ovens, electric blankets, toasters, etc. 
Compatible only with vehicles that have 12VDC Negative Ground electrical systems 
Failure to follow the above may result in personal injury or damage to the N-Verter. 
Special Features: 
NVD150S –  A swivel tip design allows you to adjust the N-Verter’s position and avoid 
interference  with the  gear shift,  cup  holders,  etc.,  in vehicles  where the  DC  socket 
location causes problems with standard units. 
NVD175X  –  An  auxiliary DC  socket  is  provided  to  allow  the  use  of  an additional 
12VDC  accessory.  Be  careful  that the  power  requirements of  the  N-Verter  and  the 
additional  DC  accessory  plugged  into  the  auxiliary  socket  do  not  exceed  the 
maximum power output of the vehicle’s DC socket. 
Operating your N-Verter
Plug the N-Verter into your vehicle’s lighter socket. If the socket is too wide and the 
plug  tip of  the unit  fits  loosely, use  the slide  control on  the plug  tip  to adjust  the 
negative connectors and ensure a snug fit. The green LED will light up when power is 
present.
Note: Many vehicles remove power from the cigarette lighter outlet when the 
ignition key is turned off!
Plug an AC device into the three-prong AC receptacle and then turn it on. Ensure your 
device draws less than the continuous power rating of your N-Verter.  To avoid 
discharging the battery, always remove the N-Verter from the lighter socket when not 
in use.
WARNING! When using you N-Verter with the vehicle’s engine turned off, the battery 
is being drained. Be careful to re-start the engine or otherwise recharge the battery 
periodically to aviod  draining the battery too  deeply. The internal “low voltage 
shut-off”  of  the  N-Verter  does  not guarantee  that the  remaining  power left  in  the 
battery is enough to start the vehicle.
WARNING!  Hot  surface The  N-Verter  housing  may  become  uncomfortably warm, 
reaching 65°C (150°F) under extended high power operation. During operation, keep 
the N-Verter from materials that may be affected by high temperatures.
Modified Sine-Wave Output
THE OUTPUT OF THE N-VERTER IS NON-SINUSOIDAL. This type of output can typically 
be  incompatible  with  small  battery-operated  products  such  as  rechargeable 
flashlights, some rechargeable shavers, and nightlights that plug directly into an AC 
receptacle to recharge as well as certain battery chargers for battery packs used with 
power tools. If you wish to use one of these types of items with the N-Verter, monitor 
its temperature for the first ten minutes to insure excessive heat is not produced. The 
production  of  excessive  heat indicates the device is not suitable for use with the 
N-Verter. The overheating does not occur with most devices which use their own AC 
adapters. The N-Verter is compatible with most of these chargers and AC adapters.
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Troubleshooting 
Symptom 
Problem / Solution 
An AC device is connected 
and turned on causing the 
N-Verter to shut down 
immediately. 
Green LED on the N-Verter 
unit does not light and/or the 
AC device does not operate 
Buzzing sound in 
audio systems 
Television 
interference 
The AC device has higher wattage demands or requires 
a larger start-up surge current than the N-Verter’s 
maximum rating can allow. The N-Verter unit is too 
small for this device. A higher rated N-Verter is needed 
to deliver the power that the AC device demands. 
Otherwise, use only lower power AC devices. 
On many vehicles, the ignition key must be “on” for 
power to be present at the cigarette lighter socket. 
Make sure the key is on. 
The N-Verter plug tip may be fitting too loosely. Use the 
slide control on the plug tip to adjust and ensure a snug 
fit and re-insert. 
Battery voltage may be too low. Recharge the vehicle’s 
battery and attempt again. 
Vehicle fuse may be blown. Replace the vehicle’s fuse 
with the same type and rating. Make sure you are not 
overloading the socket or the fuse will blow again. 
Many inexpensive stereos or portable players will buzz 
when connected to the N-Verter because the modified 
sine wave of the N-Verter is not properly filtered by the 
electronic device’s power supply. Higher quality devices 
will not buzz with the N-Verter. 
If the television signal is weak, the use of the N-Verter 
will cause a visual disturbance. Move the N-Verter away 
from the TV, antennae and/or the antennae cables. You 
may attempt to merely adjust the placement of the 
antennae or cables. Inferior antennae and cables will 
also cause TV interference during operation of the 
N-Verter. 
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