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Integrated RV HVAC system with hydronic heating and 12V A/C

4613 Views 34 Replies 9 Participants Last post by  eranrund
I’m new to the forum and plan to order a Transit Cargo van, 144” wheel base, dual rear wheels, high roof, extended/long body, AWD and convert it to a class B RV. I've spent the last 2 months on this to develop requirements and come up with a conceptual design of the system. For the HVAC system, I plan to run a hydronic heater and an under van mounted 12V compressor & condenser for HVAC use with a rear heater/A-C unit (not coupled with the vehicle) when not driving. The heater would also provide hot water through a heat exchanger. The compressor would be powered by a 600 AH 12 volt lithium battery bank and about 800W of solar on the roof. Don't really want to put AC on the roof. Has anyone on this forum already done this on a Transit? Any suggestions or advice? I am really lacking geometric information of the underside of the van to place the A/C components - and tanks for that matter. There is a separate topic for tank placement that I have started to sort through.
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I don’t think the OPs system needs to be considered “non-serviceable”.

Webasto make complete systems for the Transit including underbody condenser. The only thing their package lacks is the 12-volt compressor, but they sell those as well, so I suspect it would be easy to get them to modify the standard package to include that compressor.

Ford Transit Vans

Webasto Brochure
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How are those Webasto systems offering 32K-42k btu of cooling and heating with such low amp draw?

Considering other AC’s I see with 13,000 btu are 5-6x the amperage ?
The webasto compressor is normally engine driven so the quoted amps is just the blower and condenser fans.
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