I live on a small remote island, and fully understand that a warranty from a proven supplier is worthless once freight and time is taken into account.
I use a powerjack for the house. It runs all loads, and your stated loads are tiny in comparison.
As a remote islander, i can only say that the cheap power jacks are a godsend for this environment. An inverter is only 400 to 800 dollars, free shipping world wide as a normal thing.
They are robust provided you READ THE NOTICES about battery charging... ie turn the inverter off connect to generator, then start generator THEN turn on inverter.. and to turn off inverter THEN disconnect generator, turn on inverter again.... all will be well
The complete insides are light and cheap for about $179AUD you get the whole lot. If you drown it or kill it somehow then.... just lift out the power board and control card and replace, and your good to go again.
You will only need to do this if you ignore the warning above about charging... otherwise mine has done many many megawatt hours without a problem.
I believe there is no longer a need to make the conversion, they have read the stories on here and elsewhere and done it now from what I understand.
Make no mistake they are NOT going to do their rated power for more than perhaps 10 seconds, but they will do half their rated power continuous, and start very large loads easily.... your loads are tiny in comparison, and that included your start up. You could easily run all those appliances and start them at exactly the same time, and the 8kw units and 6kw units would not hesitate in the slightest.
eg.
http://www.ebay.com.au/itm/LCD-8000W-power-inverter-LF-pure-sine-wave-DC-48V-AC-240V-charger-LCD-UPS-/221724592680?pt=LH_DefaultDomain_15&hash=item339fd0ca28MAKE SURE IT IS A LF inverter not a lighter HF inverter.... The LF is heavy, the HF is light.... always a LF for heavy start ups and raw power. the extra weight is worth every penny of freight.... around the 30 or more kgs ( over 60lbs)
They don't send to Vanuatu. But if you have a decent rating on ebay, then email them. I have bought from Blooming inverter before a few times, and the person there (Cher) seems very reasonable, and may decide to give you a go if you outline the problem.... otherwise you will have to get it sent to the closest place they do, and then on forward it.... islands are a nuisance sometimes, but worth the hassle I think.
The cheaper PJ inverters are transformer challenged, same electronics, but only 1 transformer instead of two, it may be better to buy the dearer of the same one is what I have found... ie some 8kw units have only 1 transformer, should have 2.. etc... there is a bit of get what you pay for with some of the PJ sellers.... but some of the cheapies are the real thing too... hard to tell, but talk to the seller first, see what you are buying.... and how heavy is it? etc. Most of the weight is the transformers.
Quality control is questionable from some of them. I don't know how or why they sell as they do... so open it up when you get it and check it is all tight, no floating parts. Once going, they are very very tough units.
For a remote location, I don't see how you could get better reliability and ease of replacement without down time... ie buy an inverter and spare cards.
I would always stay with 48v. 24v gives you absolutely no gain in any part of the system... only losses from the higher currents, and double the current, quadruple the losses in the wiring, battery plates, panel wiring, fet losses and the list goes on.
Thats my answer and I have seen no better alternative for remote locations... or I would have done it. When your on an island, your on your own, so have redundancy built into your plans. The nights are long and dark without power.... I have built 5 spare inverters ( all a bit different each time) just for the hell of it...... but I have never needed any of them... but if I did, I'm good to go.
I have seen very expensive $8000 dollar inverters fail early on in their life ( some just weeks), and their owners have been without power in those cases for weeks.... trying to get warranty done..... not the fault of the manufacturer, but island transport is not a simple thing for heavy stuff, and ships are erratic here too.
.......oztules