Hello, dear oemof developers! Thank you very much for fast answers. I started to complicate my Investment-Modell. I found variable capex:
As I understood, I have to use “nonconvex” function, but I can’t complitely get, where should I put my variable capex. Normally I use capex in formula of epc:
capex_var_sole=pd.DataFrame({‘capex’:[2586, 2099, 1773, 1593]}, index=[10, 20, 35, 50])
n_wp=20
epc_wp = int(economics.annuity(capex=capex_var_sole, n=n_wp, wacc=0.05))
But this function is not working with variable capex.
And in examples epc is always constant, what is wrong in my case. So I want oemof to find the best Heatpump -Power for my energy district considering variable invest costs depends of this Power. Is it possible?