This has been touched on before, but I couldn't find any good guidance.
I am looking to add a GSM module, which will draw 4v 2a at peak. That will not go down well with the MPM-04D power supply on the OpenEVSE v5 board.
Any suggestions as to how to to approach, with consideration to cost and safety/approval? Replacing the OpenEVSE powersupply with something else, or adding an additional powersupply?