Hi,
it all depends on battery capacity and how often you plan to mow. Also it depends if you plan to build your own mower (a large one, like big mow) or if you plan to use the chassis from shop.
In my opinion, you should consider a few points:
- can you mow each day and at any time? This is important for me because of safety. Bear in mind, you run an autonomuos but stupid device with fast spinning, really sharp blades and you don't observe it during operation. So if you have small children you will not be able to operate it at any time
- maybe you can separate your area into smaller areas (in front of house, behind house)
- if you want a really long runtime, don't use lead acid batteries as they become really heavy with high capacity. You have to use Li-Ion or LiPo battery. With ardumower battery, you can mow approx 3-4h depending on grade
- you can build your own Li-Ion battery and mow 10h or more, if it fits into chassis
- if you have this large area without lot of obstacles and without small passages (trees, gates, child playground), you can build your own chassis with for example 1m width. This give you a lot of space for a huge battery and will mow a lot of lawn at once.
