I bought a doer one time that was for jumping cars. Held a good sized battery , buit in charger, a couple of cigarette lighter type plugs and jumper cables. This was all mounted on wheels with a handle so you could move it around Think it cost about $100 USD with battery. I used it for years until I let it freeze and crack the battery. BTW dont buy a Marine battery...they are just Deep Cycle with a picture of a boat on the side. You pay a lot extra for that picture.. I have a USB extender(4 ports) that uses a 12VDC wall wart to power it. I bet you could hook it up to one of the cig jacks and make it do what you want. Figure you want to power some cell phones, iPod and such.
A regular car battery is said to loose 50% of it's lifespan every time it excedes 80% depth of discharge. That means running it dead TWICE cuts it's expected lifetime to 25%.
I don't know who said that, but it just isn't true. I use a trolling motor on my boat, and have run the battery down to nearly nothing many times. After a trickle charge for a day or two, it is ready to go again and performs as well as before, time and time again, usually for three or four years.
Besides, the OP said a "marine battery", and you said a "car battery". Two related and similar, but slightly different animals.
I've seen suggestions that many UPSes will overheat (and even catch fire) that way: no active cooling because it's assumed that they will not get too warm before the original internal battery runs flat.
Except anything big enough to run the furnace will NOT run on 12 volts. My 1kva units are 36 and 42 volts. I do have an old 1kva inverter from a BELL service truck that runs off
12 volts and has a remote start feature (comes on when the load is switched on)
Hmmm, I thought you were the guy that has the furnace with an ECM blower that only uses as much electricity as a 100W bulb. If that's true, then your furnace should be capable of being run off a UPS connected to a car battery. The blower is the only load that amounts to anything. The inital startup current for a couple seconds will be larger, but still should be within the capability of an inverter powered off a car battery.....
Go crawl back under your bridge. Your reading comprehension, as well as your evident technical knowlege are both at about a grade 3 level, but your aggravation factor is over the moon.
The ecm blower in heat mode draws about (up to) 6.5 amps,plus the inducer motor. (that's the numbers from my furnace - your current draw may vary)
Not sure what the hot surface ignitor draws, but that is not an issue because it definitely draws less than the blower, and is never energized when the blower is in the "heat" mode.
If the furnace draws 7.5 amps at 120 volts (nominal) the power draw is
900 watts.. Assuming the inverter is 98% efficient that is a draw of about 76 amps from a 12 volt battery. And getting back to your abysimal reading comprehension, not very many 1kva UPS units, which is what was I was responding to, work off of 12 volts. Any that do are "bottom feeder" models that would not stand up to long-term use at full load.
If you have a AC motor blower the starting current of the blower is generally well over 150% of nameplate current - so let's say you need an "inverter" that can handle 1350 va motor starting power, with a battery current exceding 100 amps on startup. I am not aware of a 1.5kva UPS of any description that uses a 12 volt battery back.
And if you could find such a beast - and one that could run more than
20 minutes or so at full load without overheating, your average automotive battery would be below 80% depth of discharge in significantly under an hour of steady use.
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