Originally Posted by LostDog88
Still choosing one. Probably gonna be something like 2000 to 2500 watts. We just wanna run a couple CPAPs, ice maker, tv, and maybe a laptop.
The solar charger system I have already designed and will install after I get the inverter/Shore power thing worked out.
Must be pure sine as we will have a few inductive loads that won't like the modified sine wave.
I have all of that other than that the icemaker is a freezer
in our reefer-freezer box. As well I have a Linksys router for the times I want to distribute the incoming WiFi
aloft (also 12VDC in both cases)
I don't use a laptop because I don't like it, but I'd bet there was a similar solution to my built-in, mini-itx computer - which power supply comes with a typical 19.2VDC wall wart but which also runs on 12VDC - and Mag Monitor
(12VDC, ditto), with usb-dongle wireless keyboard and mouse, for your laptop. ( Pictures: Flying Pig 2011-2012 Refit/Computer Rebuild
Everything other than a soldering gun or shop vac, or for the tiny number of times we might be at a dock, the space heater-blower, is 12V. Even the 4 external HDD I have for storage
and backup purposes.
My BiPap pulls about a half-amp. My computer and monitor
pull about 2 amps. We use the monitor for our TV equivalent; there are TVs which can be monitors. The reefer-freezer will vary by what load we're asking, of course.
But every bit of it is boat house power. I did take the caution of doing a 12-12 buck boost to assure continuous (vs varying due to charge or discharge) power for the HDD, controlled by a switch, as those don't run unless needed specifically, such as during a backup or playing a movie
or the like (actually, I transfer the needed files to my computer HDD, so it's a brief time the HDD runs; ditto music).
And none of it has the overhead of standby, nor the cost in lack of 100% effective transfer to AC, all of which in our cases (and from what I can see, likely yours as well), need to be transferred back to some DC voltage. A travel adapter would accomplish all of the tasks you've listed if they can't utilize house power...
That said, I have a Xantrex XC2000 (2000Watt inverter, charger max 80A), for the times I need higher power and an inverter (as above).
YMMV but I'd look at that rather than obsessing over your challenges shown, if that's the only items you have which use AC...
As to connecting it all:
AC shorepower to the Xantrex, with pass-through automatic for times on shore power. We have that controlled to the boat outlets via a breaker; the light to the breaker is lit when AC is present, which is the case if we are using our Honda
genset for on-the-water charging.
House bank to the Xantrex 12VDC input which is controlled by a switch; we also use a remote
for convenience as our I/C is in the engine
room; when energized, that enables the inverter circuit. That same input becomes the charge source when AC is present inbound, and the I/C does the conversion.
We also have, powered through our main panel, a separate shore power charger left from the time when we had a simple inverter; that breaker can be energized to make that charger work, but otherwise it's just there, waiting for the breaker to be flipped. So, when our first I/C got wonky, we'd switch over to the shorepower inverter (both when running the Honda
genset) to finish it off. That's more complex than your installation
but illustrates how you can manipulate your system.
So, at least as I understand your setup:
Shore power to charger to Battery; battery gets charged. Maybe you have an AC switch already, allowing you to use shore power throughout the boat.
Inverter from Battery to house AC power, preferably though a breaker. If you have an inverter-charger, it would work like ours without the separate shore power charger. It's not complicated so long as you have a breaker to control each link...