Running PTC heater core under voltage range

Technical discussion on converting internal combustion to electric
Post Reply
Posts: 19
Joined: Sun, 28 Oct 2018, 16:49
Real Name: Luke

Running PTC heater core under voltage range

Post by necrogt4 »

My knowledge of PTC heater cores is limited, but from what I can gather they're really just a big resistor.

I'm curious to know, what sort of issues would / could there be when running a PTC heater core under the specified voltage.

For example, running a heater core rated between 200-400v DC at ~100v. Would it just be less efficient or would there be other problems?
Senior Member
Posts: 2698
Joined: Mon, 26 Nov 2007, 05:39
Real Name: Matthew Lacey
Location: Perth, WA

Re: Running PTC heater core under voltage range

Post by antiscab »

no issues, would just put out less heat

their resistance changes with temp, so it probably won't be as much less as you might expect (ie 1/4 voltage would be 1/16 power if fixed resistance, but more likely would be only 1/4 power due to resistance also dropping)
2017 Renault zoe - 25'000km
2007 vectrix - 156'000km
1998 prius - needs Batt
1999 Prius - needs batt
2000 prius - has 200 x headway 38120 cells
Post Reply