Change Circuitikz vsource current arrow direction

Question

Task

I want to meet the following specifications with Circuitikz:

• Technical current direction (+ to -)
• Electric field voltage
• European symbols but american style power sources

Problem

I already achieved most of the requirements but I have some struggle with the vsource, since its current direction points in the wrong direction in my case. I know that this is actually the correct behavior, since a producer always has anticipating voltage and current arrows, but using the invert option on the vsource only inverts its shape / polarity signs but not "the whole thing".

MWE

\documentclass{article}
\usepackage[utf8]{inputenc}

\usepackage[
    european,
    EFvoltages,
    siunitx]{circuitikz}

\begin{document}

\begin{circuitikz}
    \ctikzset{voltage=straight}
    
    \draw (0,0)
    to[american voltage source,  i=$I_0$, v=$U_0$, invert] (0,3)
    to[short] (1,3)
    to[R=$R_{Shunt}$, i=$I_0$, v=$U_S$] (3,3)
    to[short, -o] (4,3);
    
    \draw (0,0) to[short, -o] (4,0);
    \draw [dashed, gray] (4,3) to[R=$R_L$, i=$I_0$] (4,0);
\end{circuitikz}

\end{document}

Question

How can I achieve an american style voltage source, where + is facing upwards and the current is flowing in technical current direction?

I thought about reversing vsource's "path direction" but there has to be a better / cleaner solution, isn't it?

Reversing vsource path direction

\begin{circuitikz}
    \ctikzset{voltage=straight}
    
    \draw (0,3)
    to[american voltage source,  i=$I_0$, v=$U_0$] (0,0)
    (0,3) to[short] (1,3)
    to[R=$R_{Shunt}$, i=$I_0$, v=$U_S$] (3,3)
    to[short, -o] (4,3);
    
    \draw (0,0) to[short, -o] (4,0);
    \draw [dashed, gray] (4,3) to[R=$R_L$, i=$I_0$] (4,0);
\end{circuitikz}

Hope someone has a clean solution for my question and many thanks in advance.

Answer 1

You can control the shape, the current position/direction, and the voltage position/direction in a quite independent way. Look at https://texdoc.org/serve/circuitikz/0#subsection.5.3 (for currents, but the same stands for voltages) or this example:

\documentclass{article}
%\usepackage[utf8]{inputenc} % this is default since 2018
\usepackage[T1]{fontenc}% this is highly recommended

\usepackage[european, EFvoltages, siunitx]{circuitikz}

\begin{document}
\begin{circuitikz}
    \ctikzset{voltage=straight} 
    \draw (0,0) to[american voltage source,  i=$I_0$, v=$U_0$, invert] ++(0,3);
    \draw (3,0) to[american voltage source,  i^<=$I_0$, v<=$U_0$, invert] ++(0,3);
    \draw (6,0) to[american voltage source,  i<^=$I_0$, v_=$U_0$, ] ++(0,3);
    \draw (9,0) to[american voltage source,  i^<=$I_0$, l=$U_0$, invert] ++(0,3);
\end{circuitikz}
\end{document}

Notice that for the current, switching <^ to ^< will move the current from one side to the other.