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Hello. I have some experience with solar hot water, and there, the use of a explansion tank is a must. My experience show me that often the amount of air in the expansion tank is oversized. My point is that in your case you could get more than 200l from a 500l tank. If you want, I can do the calculations.But you can be sure that at least 300l can be reach with a acceptable hysteresis on the presure. if you could tell us the presure that your pump can reached them i'll try to find the time to calculate the setting so you can get the most from your tank. good luck. The higher the pump presure the more volumen you can get from your tank. But the more energy you will be consuming. that is the compromise you have to deal with.