That is good to know that tires do not pose a problem, that is why things need to be posted up, to find what one by himself can't find, let that be idea or info
We here have possibility to buy WC units that use natural process to make waste to dirt, ahem, I'm bit of loss of words here, but black stuff you put flower pots, earth, dirt, no electricity needed, it is all natural process, one could get away without needed of septic tank completely. Here is link to english pages of one local manufacturer for more information, it should not be difficult to make one by yourself too (mostly models for summer house are those without need of electricity)
BIOLAN - DRY TOILETS
Grey water infiltration field is then only required by the law, but if one lives near water, then those are not allowed to be filtered by field and you need non leaking container of sufficient size.
Idea is to get rid of the water from toilet mostly, with no need for any tank to be emptied costs would be nearly the same as with everything going to septic tank, only thing is that there is no need to pay annual fees, one would need to pay all that in advance. Infiltration field needs renewing every now and then and that makes some costs + some labour is needed to empty non smelling, hmm, I think it was soil(?) from composting wc unit.
After 2014 you really can't have septic tank system here as it is considered leaking to ground, only container without possibility to leak outside or infiltration field or electric/chemical purifier system and infiltration field, any system not using electricity is best.
I think that earthship can be made to work in here too, but it would require some means to have electricity stored for dark months as there is no any sensible way to produce it unless one lives near stream.
Computer is one that uses most electricity, well almost par with cooking here, that is if you exclude heating out. If I would have income other than working from home with computer, then I guess I could store all needed electricity so that even very small wind turbine (works from with very low winds) might be enough, but as I need computer and as with developing tasks it needs to be rather powerful, I'm doomed when living here.
To be 20 years younger and I would book flight to some other place where one actually could produce electricity with PV panels all year
Oh, that might make well possible to live without working at all too, to be able grow food all year, now that would certainly be something awesome :P