I have an external EMS and one of the best investments ever.
If it ever fails it would be an easy change out versus a hardwired EMS
With the exception of having an EMS with a digital display showing voltage and amperage, nothing beats having a combination multimeter with amp measuring capabilities.
I had a problem with my 20 amp A/C breaker tripping but was able to determine that the breaker was tripping at 15 amps so I replaced it and added a hard start kit to my A/C
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