Lead acid batteries don't last as long, and suffer much more from large depth of charges, meaning you need to replace them 2-3x more often. This doesn't just have a cost to it financially, but also environmentally.
It also means that if you want your batteries to last, you can reduce your depth of charge by purchasing excessive capacity. This way instead of discharging 100% of X capacity, you can discharge 50% of 2X capacity, and this lower discharge depth makes the battery last longer. Which means you tend to have to buy a lot more capacity than li-ion.
Beyond that, look at it like any system. e.g. do you want 4 small fridges that give you x liters of volume, or one large fridge that gives you 4x liters of volume for a slightly higher price? Do you want 10 harddrives that give you 100gb each for $250, or would you buy a $300 1 TB drive?
There are non-financial reasons to go for simplicity, something that works out the box, plug and play. Especially for consumer grade equipment. Beyond that, Tesla's solutions offers some integrated solutions e.g. concerning fire hazards that you'd need to do yourself otherwise. And lastly, it appears batteries benefit from economies of scale. Their battery is already for sale today, and considering the factory they're building, it's quite exciting to see how cheap batteries will get by 2025, but that's a different story.
It also means that if you want your batteries to last, you can reduce your depth of charge by purchasing excessive capacity. This way instead of discharging 100% of X capacity, you can discharge 50% of 2X capacity, and this lower discharge depth makes the battery last longer. Which means you tend to have to buy a lot more capacity than li-ion.
Beyond that, look at it like any system. e.g. do you want 4 small fridges that give you x liters of volume, or one large fridge that gives you 4x liters of volume for a slightly higher price? Do you want 10 harddrives that give you 100gb each for $250, or would you buy a $300 1 TB drive?
There are non-financial reasons to go for simplicity, something that works out the box, plug and play. Especially for consumer grade equipment. Beyond that, Tesla's solutions offers some integrated solutions e.g. concerning fire hazards that you'd need to do yourself otherwise. And lastly, it appears batteries benefit from economies of scale. Their battery is already for sale today, and considering the factory they're building, it's quite exciting to see how cheap batteries will get by 2025, but that's a different story.