In anticipation of my current batteries eventually losing capacity I have set money aside so that I can replace in 8 or 9 years time. But who knows how the prices will go? 

I could spend that money now. Then I know I have the batteries. But what's the shelf life? If I buy LiFe batteries now and just store them will they be as good as new a few years on? 

Also I'm wary of the prices I see now. Might it turn out that that price is for the BATTERIES and excludes cables, BMS etc? 

Plus stupid old me would have to install them. I'd go for a brand like PylonTech because my Goodwe already knows how to deal with those, but is it a matter of just hooking them up and changing the settings on the inverter? 

Oh dear... What have I got myself into? 

Edited November 14, 20205 yr by Bobster
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Bad idea, battery technology keeps improving and in 8 or 9 years from now you will get better batteries or get the old ones for a cheaper. Also, if you buy now and store them, you will be wasting your warranty period. storing a battery with 10yr warranty for 9 yrs means you only have 1 year of warranty left for you. My advice, rather save up the cash buy new battery with plenty of warranty and better in terms of performance 

Also, LFP batteries have about a 10 year calendar life, whether you use them or not.

You'd have to keep them cool, check their charge every year or so... a nightmare.

Buy them fresh when you need them.

Thanks guys.