The other option is to have a flag that does this (automatically, enabled by a flag --- it's a big change to make it unconditionally), namely change the orientation for angles under 45 degrees:

\documentclass[border=10pt]{standalone}
\usepackage[T1]{fontenc}
% \usepackage{circuitikz}
\usepackage[RPvoltages]{circuitikz}
\begin{document}
\makeatletter
\pgfcircdeclarebipolescaled{sources}
{}
{\ctikzvalof{bipoles/vsourceam/height}}
{vsourceAMb}
{\ctikzvalof{bipoles/vsourceam/height}}
{\ctikzvalof{bipoles/vsourceam/width}}
{

    \pgfscope
        \pgf@circ@setlinewidth{bipoles}{\pgfstartlinewidth}
        \pgfpathellipse{\pgfpointorigin}{\pgfpoint{0}{\pgf@circ@res@up}}{\pgfpoint{\pgf@circ@res@left}{0}}
        \pgf@circ@draworfill
    \endpgfscope
    \pgf@circ@text@strokecolor
    \pgfgettransformentries\a\b\temp\temp\temp\temp
    \pgfmathsetmacro{\rot}{-atan2(\b,\a)}
    \pgfmathsetlength{\pgf@circ@res@temp}{\ctikzvalof{bipoles/vsourceam/margin}*\pgf@circ@res@up-0.25*\baselineskip}
    \pgfmathsetmacro{\innerrot}{abs(\rot)<46?0:(abs(\rot)>134?0:90)}
    \ifpgf@circ@oldvoltagedirection
        \pgfscope
            \pgftransformxshift{\pgf@circ@res@temp}
            \pgftext[rotate=\innerrot]{\ctikzvalof{bipoles/vsourceam/inner plus}}
        \endpgfscope
        \pgfscope
            \pgftransformxshift{-\pgf@circ@res@temp}
            \pgftext[rotate=\innerrot]{\ctikzvalof{bipoles/vsourceam/inner minus}}
        \endpgfscope
    \else
        \pgfscope
            \pgftransformxshift{\pgf@circ@res@temp}
            \pgftext[rotate=\innerrot]{\ctikzvalof{bipoles/vsourceam/inner minus}}
        \endpgfscope
        \pgfscope
            \pgftransformxshift{-\pgf@circ@res@temp}
            \pgftext[rotate=\innerrot]{\ctikzvalof{bipoles/vsourceam/inner plus}}
        \endpgfscope
    \fi
}
\pgfcirc@activate@bipole@opt{v}{vsourceamb}{vsourceAMb}{american voltage source b}{%
    \circuitikzbasekey/bipole/is voltage=true,
    \circuitikzbasekey/bipole/is voltageoutsideofsymbol=false}

\makeatother

\begin{tikzpicture}[american]
    \foreach \a in {0,30,...,360} {
        \draw (0,0) to[V, invert] ++(\a:4);
    }
    \foreach \a in {0,30,...,360} {
        \draw[color=red] (8,0) to[american voltage source b, invert] ++(\a:4);
    }
\end{tikzpicture}
\end{document}

Controlling the rotation of american-style source's signs #773

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