Solar Storage Tank Sizing

[Haz9119]

Hello.

I have a project where I need to size a solar storage tank based on 12-16 evacuated tube panels. Each panel has 20 tubes. This is the double wall evacuated tube heat pipe system.

Question is: I need 5000L/Day of hot water at 60C. I figured I'd put in 2000L of storage so 4 x 115USG indirect hot water heaters. Is that enough or too much storage?
Each tank is 115USG (450L) so I figured 4 tanks would suffice..?


Thanks,

Haz