"and its so quiet you wouldnt believe it!!"
You are right - I wouldn't believe it.
Best person to ask about that is the poor bugger camping next to you.
Before spending money on an imitation Honda, check whether you can get service on it.
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Solar panels are great but I feel that a single 45watt panel would be hardly worth the messing around. An 80W starts to get useful if you are frugal with power and two 80W panels make life away from full hook-ups a lot more comfortable.
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Belgium said - "If you use a converter 12V>240V (you loose power) then you have to tranfso it back 240V>18V (second loose of power). Futher more this is 'flattened' direct voltage. You have a double amount of 'fluctuations' and instability."
Sorry Belgium, this is just not true if you use a decent true sinewave
inverter and anyway, all mains power supplies for laptops are designed to deliver stable output for any AC voltage between about 90V and 260V so they can handle these mythical 'fluctuations and instability" because that is exactly what they are intended to do. They will even work reliably from any of the fake sinewave inverters as well. The other thing to watch is that all computers do not run on 18volts either. Use of a generic 12V to 18V (or whatever the proper voltage is for your laptop) DC -DC converter may put your computer at risk and will certainly invalidate any warranty.
From a convenience point of view, a decent
inverter can be more economical because you can use it for several things by powering the various mains adaptors you already have rather than buying special DC-DC converters for each appliance.