Looking to get solar again

eyeofthetiger999

Hi
In 2005 I purchased a 4kwh solar system with no batteries.  It cost £4.9k and when I moved out 2021 I had probably made around 3.5k meaning a payback period of around 8 years.  The majority of benefit was fit payments.

I have been quoted 11k for a 4kwh system with 5.6kwh battery2×2.8kwh, another is similar price

Annual electricity usage of 2200kwh(very low I've been told) or £73 pm from Oct.

I have some questions, I would be grateful if you could answer
1.  Without battery, my lecky bill reduced by approx a third in my original home.  What is figure with batteries?  One person has said 60-70%, another has said 90%
2.  What payback period do you deem as acceptable?
3.  What are thoughts on quotes
4.  Is payback time increased or decreased with battery and would you recommend or not.

Thanks

eyeofthetiger999

Sorry, purchased in 2015 not 2005

rew81

I can only compare the price with what I have received and what other users discussed on the forum, it is clearly a "rip off Britain" case. 
I will also rely on my battery to make the most of my system and hope to use close to 70-80%(or more)of production. 
If your electricity usage after production stops  is close to 0 (highly unlikely) then, in my opinion,  you won't need one otherwise the battery is a must. 
Look in other threads for prices and more info.