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I used a KaW on the input side and a DVOM on the output side to record the efficiency of my chargers. I had a Schumacher at ~60% efficient (iirc) during bulk charging, and a MeanWell PSU at 84% efficient.
I never would have expected the Schumacher to take three times as much energy to do the job. That has to be due to more than just power conversion efficiency. It must be running a higher float current than necessary, or something.
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