A good question. First you need the number of charge cycles that the battery can take. For Li-ion it has been around 1000 cycles but car battery design might have improved on that. So if you fully discharge a battery daily and then recharge it to max/full thats a 1000 days/3 years. In practice you may get longer if the battery is only partially discharged on some days so if you discharge 25% and recharge for 4 days that'll count as 1 cycle.Interested to learn more here. I've heard there are reliability issues, so once out of warranty how much does it cost to send someone up on the roof to sort it?
And how long do the batteries last?
For Li-ion it has been around 1000 cycles but car battery design might have improved on that.
But if you discharge by 25%, then recharge to 100%, that's a charge cycle too.A good question. First you need the number of charge cycles that the battery can take. For Li-ion it has been around 1000 cycles but car battery design might have improved on that. So if you fully discharge a battery daily and then recharge it to max/full thats a 1000 days/3 years. In practice you may get longer if the battery is only partially discharged on some days so if you discharge 25% and recharge for 4 days that'll count as 1 cycle.
The hotter the ambient air becomes, the less efficient your solar panels will be.
The LIKELY economic replacement period for the panels themselves is around 20 years.
So at ~ 20years what you do, perhaps, is just tack-on another panel; maybe two.
Swap one or two out, then; same end.