From Julie Haugh [email protected] >>Seems the benefit of using % charge would go out the window if your batteries >>were sulphated....just when you would need the voltage based/temp comp logic >>the most. No experience with your proposal though. > >The PentaMetric has a feature that allows you to determine if the batteries >are sulfated by comparing the state of charge and discharge voltage. A >healthy battery has a fairly linear decline in (temperature corrected) voltage >under load. The discharge voltage of a sulfated battery collapses in a very >characteristic manner. What the PentaMetric does is track voltage, load, and >state of charge in an internal spreadsheet. What you want to see is nice, >smooth curves with no abrupt drops. And the great thing about this feature is >that it will tell you went a battery is sulfated, but not so badly that it is >obvious. > >I forget the exact option, but the software that is included with the >PentaMetric should allow you to download the spreadsheet that's in the >PentaMetric's memory and look at the SOC / voltage data. > >As an aside, there are advantages and disadvantages to using SOC to control >generator start and stop. The better solution is to use both temperature >compensated voltage and state of charge. Voltage protects against integration >(rounding) errors in the SOC calculation, while SOC protects against >discharging under low load when the voltage might remain higher than the low >voltage start. >-- >Julie Haugh >Senior Design Engineer >greenHouse Computers, LLC // jfh at greenhousepc.com // greenHousePC on >Skype
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