Why power inverter for car won't work for heating pad?


Old 10-13-13, 06:28 AM
Thread Starter
Join Date: Jun 2005
Location: USA
Posts: 559
Why power inverter for car won't work for heating pad?

My wife wants to use her heating pad from home when we travel in the car on long trips. I bought a 140W inverter to plug into the car and thought that would work fine. But it didn't. I returned the inverter but before I try buying another I though I would run it by you guys. The heating pad is only rated at 45W. When I tried to use it the control for the heating pad would come on at first and I would put it on medium setting but then the light would start flashing and it would not heat. Pad works fine at home plugged into the wall. Any ideas or suggestions?

Sponsored Links
Old 10-13-13, 06:35 AM
GregH's Avatar
Super Moderator
Join Date: Jan 2001
Location: Manitoba
Posts: 9,750
It is possible if the controller for the heating pad is electronic it my not operate with a modified sine wave inverter.
You could either look for a simple heating pad with no electronics or purchase a sine wave inverter.
Old 10-13-13, 07:45 AM
Group Moderator
Join Date: Mar 2003
Location: NC, USA
Posts: 18,112
I have the same problem with my newer cordless tool chargers. They will not work on cheap modified sine wave inverters and need a pure sine wave for the electronics which is a shame because a true sine wave inverter costs about 3-4 times as much.

Another option would be to purchase a 12vdc car heating pad. I don't know where my wife found it but we have one so I know they do exist.
Old 10-13-13, 07:51 AM
Banned. Rule And/Or Policy Violation
Join Date: Apr 2013
Location: USA
Posts: 4,297

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Display Modes