Given the known total amp-hours of your battery bank, how much has been used, and how much it being drawn (used) at any given time, it can also tell you how long your batteries will last!
Not only that, but it can also tell you exactly how many amp-hours have been used and a very precise SoC (percentage). Having the data provided by the shunt, a smart battery monitor like the BMV-712 can use that data to compensate for current going in or out and give you an accurate voltage measurement. Nothing goes in or out without being seen by the shunt! The shunt sits between your battery bank's negative terminal and everything connected to it! This means it can “see” all current flowing into and out of the battery bank. The bottom line is, the voltage number you might see on the control panel in your RV is wildly inaccurate! Shunted Battery MonitorĪ shunted battery monitor has a huge advantage over voltage-only monitoring! That advantage is in its name, and it's the shunt! But, that's even more unrealistic than unhooking them to get a voltage measurement! You can also use a hydrometer to measure the gravity of an electrolyte sample from you pull from the battery. That's not a pain, right? And it's still not super accurate even if you do! The only way to get an accurate measurement is to disconnect the batteries from the RV and get a measurement at the batteries. The temperature and condition of the batteries can also throw off the measurement. Using the batteries will make the measurement low and batteries are always in use in an RV. There are so many things that will perturb the measurement. The issue is getting an accurate voltage measurement! And that's the real issue.
This type of measurement can be somewhat accurate. If you search google for “ battery state of charge by voltage“, you can find all kinds of resources showing what voltage equates to what SoC for various battery types. Measuring voltage is the default way to measure SoC (State of Charge) in most RVs. But, the struggle is real in an RV! Voltage These are things you just don't have to think about in a house. For our first six months or so, when we boondocked, we played the guessing game with our battery levels.Īre we fully charged? What percentage are we at now? How much time is left till the lights go out? Will our furnace be able to run all night?
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