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This is a totally uninformed comment & you all probably already know this . If you do please forgive me .
I know you wish to use little or no energy from the propulsion battery for cabin heat . If you can avoid it .
I saw a video , some time ago , an EV'er added a water / coolant heater to an EV . It ran off of gasoline or diesel . He probably had a small coolant pump to circulate the coolant flow to a cabin heater using a heater core . Think the electrics involved were 12 VDC .
Would this help you guys out ?
Another though . If you have to use electricity , from the propulsion battery for cabin heat , I am pretty sure you can use 120 VAC resistance heaters ? If you have 72 VDC available , using it on a 120 VAC heater would produce a little more than 1/2 the amount of heat they would produce on 120 VAC . This amount of heat might still be useful . And the household heaters are inexpensive .
If you can find one at the Thrift Shop , almost nothing . The oil heater mentioned would be safe , since the surface temp should be low enough to avoid burns & fires .
God bless
Wyr
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