Using a meter to turn off a charger at a pre-programmed voltage can be very risky. A BMS is designed to perform this function, but turns off the charger when a single cell reaches the pre-programmed voltage, after permitting all cells to achieve the same voltage by shunting. It also protects against over dis-discharge. A single meter cannot perform these tasks in anyway shape or form. The SOC meter provides all the information concerning usage and is VERY accurate and programmable. All American electric production cars use very sophisticated BMS systems to achieve longevity due to a mandatory 8-year 100k mile warranty required in CA. Don't risk a expensive Li-ion battery pack by relying on a meter to shutoff the charger at a set voltage. Could be used as a backup if desired. If we learn from the big guns on how they do it, we will be on the right track and prevent a disaster that too many can attest to. My 2-cents worth.
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