I totally agree.Its better that unit ,truck or car to totally disappear than be found partially destroyed.

Your math is wrong. The 7.6 Amp current is the continuous draw for as long as your heater is running.
The 828 watts is what is affected by time.
For easy calculations: Your heater ( my example )is using 800 watts of power. Over a four hour period you have use
3200 watts or 3.2 Kilowatts. Power used is based voltage (120 VAC) x Current (6.6 Amps) x Time (4 hours). Over 24 hours you'll probably use 800 watts x 24 hours x .8 (duty cycle) for a total of 15.4 KwHr of energy . Duty cycle is the ratio between the time plugged in versus how much it actually is in use.
Your battery has to be able to supply that 800 watts of power from your 12 volt system. Assuming no loss in converting 12vdc to 120VAC , the battery has to be able to supple 66 amps to run the heater.
You should be able to run your run the unit thru the inverter from your batteries.
A 250 AH battery is designed to supple the 250 Amps for a given period (usually 8 hours) before it reaches the lowest manufacture recommended voltage.
As Ray said if you are away from shore power and running on batteries . The propane furnace is a better option.

If you find that there is a problem with the propane. I would highly recommend going to someone qualified to work on propane. This not really a do it yourself repair. Especially if the pipes have a leak .

The valve is easily placed at home. this valve can also be used to bleed off air . Just make sure you have the right pressure valve.

The system that your neighbors to the north isn't great. Yes our premiums don't exist. But the basic system doesn't cover dental ot vision. Those have to be bought thru third party carriers . Being retired and covered by my company retirement medical . I pay $145 a month to cover the extras. I'm only allowed $300 a year for misc like dental. Vision isn't covered at all. Prescriptions aren't covered under under basic or provincial plans. We also have a shortage of doctors. In our city (of 70000) about 40% of people don't have a regular doctor. They depend on the emergency department or walk in clinics.
Waits to see specialists can be up to 12 months. Then if the specialist recommends surgery . It could be another years wait. Certain health issue like cancer are done quickly. Certain routine procedures(in the US) aren't done in Canada. I'm only telling you what the situation is in British Columbia.

When you order custom cable like 2/0 . The length you give doesn't normally include the added length from the connectors. If you want length to include connectors , you have to specify that.

If you have found those cracks. I would do a serious check for other cracks that are possible starting.

What people are forgetting is the gauge of the wire determines the maximum current can flow thru it safely. In industrial application we would run 14/2 (14 gauge 2 conductor) from a bank of four 12 volt 250 w solar panels. We didn't have any loss over a 50 foot run. Where we put Flexible welding cable was on the output of the solar regulator to the batteries and between the batteries .
Max open circuit voltage of each panel is 20 Volts . The short circuit current is about 18Amps. These values depend on the weather and how much sun is hitting the cells. I have never seen more than 8 VDC at the input to the solar regulator. Solar panels are current sources not a voltage source.

Currently only Washington, Oregon and California require the use of chains on trailers. I got this information from a trucker on You Tube that hauls thru the United States west of the Mississippi valley to the Pacific Coast and Texas to the canadian border.

Thanks ray. I forgot about the USB-C standard . USB-C is also the same as the Thunderbolt 4 connector that Apple now uses on laptops.

Ray
CPAP machines don't cycle during their use. The compressor , humidifier and heated hose run continuously . My CPAP power supply is rated for 1 Amp at 110 Volts . This power source should be able to a CPAP or a APAP without any issues.
Question : How can you feed 100w thru a USB connector? That's about 20Amps at 5 VDC or 8 amps at 12 VDC.

Ray I think that's way they rate the solar regulator. Not by the output of the solar panels.

Solar charger will shutdown once the battery voltage reaches their normal voltage of 13.6 volts.
Each solar panel can put out a maximum of 6 amps. Each panel has a two rating . One is open circuit DC which normally is about 20 volts. The other is max short circuit current which normally run at about 6 Amps. Since under normal conditions solar panels don't run at max values . The 20 Amp should be OK . You can use the 40 Amp if you plan to add or upgrade the solar panels later.
My own experience with stationary solar system is that on a bright sunny day ,and with solar panels at the correct angle . Our output was 5.5 A short circuit current with an open circuit voltage of 18 VDC. The panels where rated for 120 watts . Our actual output was a 100 watts .

Another possibility is that the thermocouple that controls the temperature is broken. This thermocouple controls the operation of the compressor. I don't know how easy it is to replace or locate . Ray might have an answer to that .

As a Canadian , we use Koodo Mobility which is a low cost subsidiary of Telus. They have plans with data up to 10GB per month. My wife's plan is $70CDN per month with 10GB data , unlimited Canada wide minutes and unlimited texting (includes text and pictures). I pay $55 CDN per month for the same except 4 GB of data.
We have international roaming as well. In the US and Mexico its $8 Cdn per 24 hours and $15 Cdn in the rest of the world

of all the brands Ray mentioned I would recommend LG. They are one of two manufactures of flat screen TV's. Sony is the other manufacture. Most are made by these two companies under license for for other companies. Check that it has Wifi , ethernet , USB ,VGA and HDMI inputs.

I think it depends on how far away the dumping station is. The tanks shouldn't smell if the system is working properly.

I would check the manual for the new thermostat. Some of the new digital have to be setup internally for the type of system your running. The other thing is cross check the terminals for colours. Sometimes the colours that are use used are wired to no standard. I found this in changing thermostats in residences that the color code depends on who installed and the brand of furnace.

You might want to consider buy a multichannel dash cam . There are some good after market ones.They all record what you see to the front and back.