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For my Porsche Boxster 986 project I am looking for a PTC cabin heater fitting the 155x50x230 space. Another Boxster conversion here in the forum is using this one https://evwest.com/used-1500w-electric- ... -smart-car . I don't find it in Europe and I want it to be LIN / CAN controllable. VW ID.4 / Hundai Ionic are to big.

I am thankful for any idea, even if you don't have one to sell. Thanks.

I used to use that EV West PTC. It does not produce a lot of heat.
LIN or CAN controllable more or less equals OEM re-use but those units tend to be much bigger.
The Hyundai PTC I had was one of the smallest I could find and was 23x19

So then I think there are a couple of options:
- Create more room and go WV ID PTC
- Use a CAN controlled water heater and a heat exchanger

Or if you change LIN/CAN to PWM then a 12V PTC maybe.

Thank you for your ideas. Unfortunately there is not much potential for creating room . It would directly mean slaughter around in metal .

I have used this one in the past in a boxster without modifying the HVAC https://shop.fellten.com/shop/3kwptc-3k ... category=6

tom91 wrote: ↑Thu Nov 28, 2024 10:33 am I have used this one in the past in a boxster without modifying the HVAC https://shop.fellten.com/shop/3kwptc-3k ... category=6

Is an SSR, like the D5D10 from Crydom, suitable for switching a 3kW PTC heating element, even with a slow PWM signal?

muehlpower wrote: ↑Thu Nov 28, 2024 12:01 pm Is an SSR, like the D5D10 from Crydom, suitable for switching a 3kW PTC heating element, even with a slow PWM signal?

All depends on your full setup, the biggest issue is any voltage spikes caused by the current being stopped briefly in the pwm. It will also of course need some heat sinking to dissipate the heating during switching.

tom91 wrote: ↑Thu Nov 28, 2024 12:15 pm All depends on your full setup, the biggest issue is any voltage spikes

I don't know which aspect of my setup is crucial. I only have one HV circle. This means that if the contactors are closed after pre-charging, everything is energized and then the heater can also heat up. Do the capacitors from the drive unit, the on-board charger and the DC-DC converter absorb the voltage peaks, or are the peaks on the side of the heating element? For the PWW I thought about 1Hz because the heating is generally slow.

The inductive load of such a heating element should be quite low , shouldn’t it ? It’s mainly resistive load probably.

I try to keep everything as OEM as possible. So a can control and overtemperature protection would be preferable.
When using a contactor controlled heater anyway , I can stick to the one I have which was already TÜV approved .

Probably instead of PWM with a SSR even a hysteresis control with the orgiginal Temperature sensor or with an added one would be also possible. With the thermal system having a low momentum it should result in a low switch frequency.