Hi, we are hoping that someone out there can offer some advice please. Around six weeks ago one of our batteries on our solar system had to be renewed and everything has been working fine until yesterday. We now think that another battery or two are on their way out. Does anyone on here who has their own solar system have any experience of replacing batteries. The batteries are very, very expensive and do not seem to have come down in price over the years. Does anyone know if they can be recondioned at all. Any advice would be very much appreciated.

Firstly, no, sorry can't help.
Secondly, I have a house completely solar run and have had my batteries for about five years. I am dreading the day when I need to replace them and I'm hoping by then the prices will have come down, but I doubt it.
How much is your new one?

The new Tesla home storage battery should be available by the end of the year. About EUR3,000 compared to EUR10,000 for a similar sized battery from a different brand. Looks great too!

Personally I am waiting for Tesla's integrated solar roofs!

What batteries are you using, power/brand etc. What panels are you running, again power. Are your panels fixed/static or do they hunt the sun? How are you using the power, 12v or inverter(s), how are they connected, serial or parallel ?