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Replace the strings when their values or performance indicates. Run the string until it dies and make sure you have a redundant string, hopefully staggered in age.
![midtronics battery tester cell to cell resistance check midtronics battery tester cell to cell resistance check](https://image.dhgate.com/0x0/f2/albu/g10/M00/FD/A9/rBVaWV1su2uARmgqAAFFt9FgsCM750.jpg)
Even replacing a suspect block with a new "impedance-matched" one from the factory will never truly align the values. But there is absolutely nothing that you can reasonably do about it. With respect to parallel 3 cell monoblocks, the unequal resistance of course promotes deterioration of the better cells especially during equalize and charge cycles.
![midtronics battery tester cell to cell resistance check midtronics battery tester cell to cell resistance check](https://images-na.ssl-images-amazon.com/images/I/71%2BLwZqCBzL.jpg)
You just want to observe a radical change in level and be able to tell when the river is overflowing its banks! Think of these measurements like a depth stick in a river. Given that flooded fail gradually (almost never an open circuit, just a reduced ampacity/capacity), it probably does not matter much here either. Given that VRLA's are especially sensitive to temperature, pressure & hummidity and that most are 10 year design life at maximum AND that VRLA's can fail quickly & dramatically (open circuit or short to open circuit), I don't think that it much matters which you use. The telecom world seems to prefer the conductance (Midtronics-type) while the Critical Data Power (UPS)world tends to prefer the impedance (Alber-type). Now it is easier than ever to show the current state of the battery and electrical system by providing customers with a printed result of the battery and system test. Impedance? There are only about a gazillion white papers on each side of this issue. The MDX-P300 is the first tester available from Midtronics which features an integrated printer allowing for immediate printing of test results. Apparatus for measuring internal resistance of wet cell storage batteries. RE: Battery test by conductance? B3188 (Military) 8 Jun 06 12:18 When testing a battery, a battery tester must be electrically coupled to. All others state the facts and cite references. We use only DC load test method at our customer sites. Also ask if the same folks if they publish reference conductance values on their batteries. They will only support warranty claims based on DC load test results. We talked to the engineering folks at two major manufacturers of industrial batteries the the answer was no. versus DC load testing.Īnd, talk to the engineering people that design the batteries in question and ask if they will support a warranty claim based on conductance tests. The most informed writing I have found is here this link.Ī major issue is around the use of AC impedance measurement techniques. Yes I'm familar with them, but rather than getting into a lengthy discussion of conductance testers, (as these things have been debated for years, if not decades).