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Here is an expensive but simple solution:

^{simulate this circuit – Schematic created using CircuitLab}

I'll try to tidy up this...

If you don't want to charge from mains, substitute your AC/DC charger with a DC/DC one, but isolated/floating.

Here is an expensive but simple solution:

^{simulate this circuit – Schematic created using CircuitLab}

I'll try to tidy up this...

If you don't want to charge from mains, substitute your AC/DC charger with a DC/DC one, but isolated/floating.

Here is an expensive but simple solution:

^{simulate this circuit – Schematic created using CircuitLab}

I'll try to tidy up this...

Here is an expensive but simple solution:

^{simulate this circuit – Schematic created using CircuitLab}

I'll try to tidy up this...

If you don't want to charge from mains, substitute your AC/DC charger with a DC/DC one, but isolated/floating.

Here is an expensive but simple solution:

^{simulate this circuit – Schematic created using CircuitLab}

I'll try to tidy up this...

Here is an expensive but simple solution:

^{simulate this circuit – Schematic created using CircuitLab}

I'll try to tidy up this...