Update for my converter. The delivery from the “cpap shop” was a bit slow, I think they forgot to send it for a week
Seems to be ok, plugs straight into a cigaret lighter type socket, the plug itself is very solid and has an on/off switch with an illuminated on light. The unit itself has a very small green led light that flashess when the power is on but the cpap pump hasn't been turned on, when the pump is turned on the led goes to a solid green light.
The whole unit is very compact, about the size of a stubbie holder and weighs about .5kg
The bit I really like is that it is portable,I can unplug the unit, stick it under my pillow in the camper for transport or take it out and plug it into any 12/24v dc power supply socket anywhere without any installation.Do you think I'm happy