Re: BB HSKY 48v and Renogy 500
I have the same setup. I also have a 12v inverter and Alltrax controller wired to my power switch. EZGO TXT cart.
My meter reflects a 3-5 watt draw all the time, which I assume is the power required to power the unit itself (it is always on).
I reference the resting voltage against the displayed calculated SOC % each day and have found that it seems to be consistently accurate, certainly well under the 5% weekly variance loss posted above.
Unless you have the sealed charger from BigBattery, you have no way of knowing when the charge ends as the 15 amp charger fan runs constantly. Just be aware that is a "feature"...
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