![]() If you haven't already, I suggest reading up on 3 stage charging (bulk, absorption, float). The question is whether they're triggering at an actual SOC significantly lower than 100% SOC. That's why they're used to keep the monitor accurate. Those trigger voltage and current conditions should be reached at the same actual battery SOC every time. There is no relationship between the current SOC reading and the synchronisation trigger point. You're assuming the SOC reading is more accurate than the synchronisation trigger point. The curve should flatten out but if you wait for the current to stop dropping completely, you will be waiting for a very long time. I've only managed to get my BMV settings close to correct by observing the way the charge current tapers off during absorption and float. If the boat is just a weekender and can sit there charging all week, this will be ok. Unless you're near the North Pole now, there are just not enough sun hours in the day to slowly trickle in those last few percent. ![]() If you're cycling an AGM battery daily and taking any significant power from it, you may have trouble getting it fully charged. This could be a long time before the battery reaches 100% as the battery just won't accept charge quickly as it gets closer to full. The potential for this starts when the voltage has reached your temperature compensated absorption or float voltage depending on which charge state it's in. If the voltage does not drop when the load is applied then it's using "excess". Victron's BMV monitors are highly respected so probably have one of the best algorithm's attempting to take all these factors into account but no monitor is perfect.įor using "excess" solar, you could just monitor the charging voltage. The idea is to define a a set of conditions under which the battery must be fully charged so the monitor can synchronise it's SOC measurement to reality. Without synchronisation, the SOC measurement gets less acurate over time. The direct answer to your question is that the purpose of automatic synchronisation is to keep your SOC measurement as accurate as possible. If you're battery is at 50% SOC, it will take charge with almost 100% efficiency but this drops off to very low percentages as you work through the top 15% SOC. You can program it into the battery monitor but, in reality, it is not a single number. A well configured battery monitor tends to be most accurate during discharge.ĭuring charge, the charge efficiency factor comes into play. The peukert's constant you program into the monitor, if correct, does a good job of acccounting for this. Also, the total power you can draw from it is less if you draw it out quickly. The battery's actual capacity reduces with age. ![]() It's still not perfect though and most real world situations are far from this ideal. The worst method is measuring it's voltage, although better if it's been sitting disconnected for many hours.Ī battery monitor comparing AH in to AH out does a decent job, especially in a controlled situation where you get a steady discharge followed by a steady charge back up to 100%. Programmable relay to turn off non-critical loads or to run a generator when neededHi of drawing some fluid from a flooded battery and measuring the specific gravity, all methods for monitoring the SOC of a lead acid battery are approximations.Bi-stable alarm relay prevents increased current draw in case of an alarm.Very low current draw from the battery helps improve battery longevity. ![]() Midpoint voltage monitoring to help detect bad cells or batteries within a bank.Also includes front display bezel for a square or round display appearance, and mounting hardware.Easy to install with included shunt and cables.View live status information such as battery voltage, current, power, Ah consumed, and SOC.You can use a Smart Phone or other Bluetooth-enabled device to customize settings, monitor data, view historical data, or update software when new features become available. The Victron Energy BMV-712 Smart Battery Monitor has Bluetooth built right in, to help simplify system installation, as well as the monitoring of battery performance – including Lithium batteries. The Victron Energy BMV-712 is a high precision smart battery monitor the essential function of the monitor is to calculate ampere hours consumed and the state of charge of a battery ![]()
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