Quote:
Originally Posted by biterope
Right, and BB told me that it is fine to leave on the charger. Don't know that I feel comfortable with that but so far so good.
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LiFePO4 (and most (all?) lithium chemistries) are going to give the best long term life when kept between 20-80% SOC, so if you are saying that leaving it plugged in at 100% SOC is fine, that is true that the battery will not overchage, but it is not the ideal state for the batteries.
Reading it again, I think you are saying leaving the charger running is fine. I don't doubt it, but the fan is pretty loud, so I prefer to not hear it buzzing while I'm not using it.
I'll prob install an outlet timer eventually and just charge in hour long increments or something instead of having to constantly unplug from the outlet between charge cycles.
Quote:
Originally Posted by fstop
Not implying that whatever battery / BMS you are using has appreciable loss as I mentioned when powered "on", but voltage is an exceedingly difficult way to reflect SOC with these batteries since the discharge / voltage curve is so flat, which is why the shunt-based coulomb counting meters are much more precise.
I don't have a "Big Battery" battery, nor their charger, but it's clear to see on the Renogy meter biterope has when any charger shuts off (if you can't tell otherwise) as the charge amp-rate reaches zero.
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Wasn't trying to disagree with you. I appreciate hearing your experience. Agree totally that lithium is difficult to gauge SOC.
You seem much more knowledgeable than me regarding these meter types. My understanding is that the Renogy meter is a shunt meter, is that correct or does another style of shunt exist that is different and would be more accurate?
I believe these meters are also programed with the lithium charge profile used to reflect %. I had a lead acid profile shunt meter previously that was grossly inaccurate.
Agreed, when the charger turns off the meter reflects it. Just a peeve of mine that on a standard charger you get an audible or visual queue. My RoyPow charger even blinked at different speeds to indicate 80% SOC status.
The one BigBattery uses has a power LED and an always-on fan. Annoying that I have to come all the way to the cart and check my meter to determine where my charge is, esp given that the meter isn't a factory paired option and could have variances in accuracy.