Initializing a Charging Cycle with "Current function [A]" and without the "pybamm.experiment" Function

[Patrick-Moore1]

When solving a simulation, if there is no input in the experiment category, then the default is to start a discharge. However, I want to start a charge cycle with a current function that I have inputted, but I cannot figure out how to accomplish it. Inputting a negative current returns an error that "events ['Maximum voltage [V]'] are non-positive at initial conditions."

A quick example of a simple model to solve is:

import pybamm


model = pybamm.lithium_ion.DFN()
params = pybamm.ParameterValues("Chen2020")
params["Current function [A]"] = 3


solver = pybamm.CasadiSolver(mode="fast")
simulation = pybamm.Simulation(model,parameter_values=params, solver=solver)
simulation.solve([0, 300])
simulation.plot()

The solution for this is given as a discharge from around 3.95V, but I would like for it to solve a charge from 2.5V. Does anyone know how to solve for a charge cycle?

[valentinsulzer]

Try simulation.solve([0, 300], initial_soc=0)

[Patrick-Moore1]

Thanks! Using that condition and negative current values, I was able to get it to model charging.