Everything in this section should be taken with a grain of salt, as it highly depends on your location, personal skills and personal preferences.
Here is a rough take on budgeting for OffGrid.
30% Reserve for unforeseen issues
10% Live support, administrative and legal fees
When you live OffGrid it is important to have a certain financial reserves. If a vital systems breaks and you do not have a local backup installed or a workaround is impossible you might be in a position of having to source things quickly. If your water pump break in middle of summer whilst having farm animals, heating breaks in middle of harsh winter, power dies entirely, etc etc. It is highly recommended to have backups in place for vital systems such as : water, electricity, heating. These backups don’t necessarily need be able to fully replace your default setup, but they should be reasonable sized to carry load for a while. Pricing of vital systems goes up by roughly 15-20% for having fallbacks installed. While it may look a big “price increase” you will need it sooner or later, 100% guaranteed some day something vital will break. Having systems setup from the start to take that into account can ease a lot of stress and basically removes the need for spending “emergency $/€” to workaround something until it gets properly replaced. Ex: having a generator is a legit “workaround” for your electric system, good to use when maintaining batteries, changing cables, installing new solar panels etc, but it is not a “backup” for when your main inverter dies. It is exponentially more expensive to run a full household 24/7 on a generator to maintain everything while you need to wait for your new inverter to arrive. The proper backup would be to have 2 inverters setup, use one as default and resort to using the 2nd if the default one fails. Casually order a new inverter. When it arrives, run your generator for 20 minutes whilst replacing the broken one.