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#11
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Testing Betteries
Load testers are good for starting batteries but don't really tell
much for a deep cycle battery. Doug s/v Callista "Dennis Gibbons" wrote in message et... You need to borrow a load tester. It is just a heavy duty heat sink which draws current from the battery. If the voltage drops during the test, the battery is dying. I have to borrow one to test my setup come Spring -- Dennis Gibbons dkgibbons at optonline dot net "Rick & Linda Bernard" wrote in message ... Anyone have a good way of testing 12V deep cycle batteries? What I was figuring on doing was using a 50watt 12V lightbulb and measuring voltage with time. The only problem is that this may take a few hours. |
#12
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Testing Betteries
A battery test in an old Ample Power catalog was to charge to 14.4 volts and
hold it there for an hour. Let it rest overnight, and then retest. 12.8 v & higher=good 12.6 to 12.7v=marginal 12.4 to 12.6v=very poor less than 12.4 v=worthless "Rick & Linda Bernard" wrote in message ... Anyone have a good way of testing 12V deep cycle batteries? What I was figuring on doing was using a 50watt 12V lightbulb and measuring voltage with time. The only problem is that this may take a few hours. |
#13
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Testing Betteries
A battery test in an old Ample Power catalog was to charge to 14.4 volts and
hold it there for an hour. Let it rest overnight, and then retest. 12.8 v & higher=good 12.6 to 12.7v=marginal 12.4 to 12.6v=very poor less than 12.4 v=worthless "Rick & Linda Bernard" wrote in message ... Anyone have a good way of testing 12V deep cycle batteries? What I was figuring on doing was using a 50watt 12V lightbulb and measuring voltage with time. The only problem is that this may take a few hours. |
#14
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Testing Betteries
"Doug Dotson" wrote in message
... Load testers are good for starting batteries but don't really tell much for a deep cycle battery. Doug - s/v Callista ==== Doug, Any idea why is this? Is it possible to have good sg and still fail a load test? I.e., is a load test more sensitive than sg? (I presume that sg is more specific than measuring voltage?) Does it go like that, in terms of accuracy?: voltage specific gravity load testing??? Will an appliance such as a commerically bought load tester be more or less accurate than doing a long, slow test oneself, such as by leaving lights on? (And, one other poster mentioned testing down to 50% charge as more convenient than testing to 0% charge - isn't it also true that testing to 0% charge will ruin the battery?) Charles (So many questions, such limited memory capacity...) ==== Charles T. Low - remove "UN" www.boatdocking.com www.ctlow.ca/Trojan26 - my boat ==== |
#15
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Testing Betteries
"Doug Dotson" wrote in message
... Load testers are good for starting batteries but don't really tell much for a deep cycle battery. Doug - s/v Callista ==== Doug, Any idea why is this? Is it possible to have good sg and still fail a load test? I.e., is a load test more sensitive than sg? (I presume that sg is more specific than measuring voltage?) Does it go like that, in terms of accuracy?: voltage specific gravity load testing??? Will an appliance such as a commerically bought load tester be more or less accurate than doing a long, slow test oneself, such as by leaving lights on? (And, one other poster mentioned testing down to 50% charge as more convenient than testing to 0% charge - isn't it also true that testing to 0% charge will ruin the battery?) Charles (So many questions, such limited memory capacity...) ==== Charles T. Low - remove "UN" www.boatdocking.com www.ctlow.ca/Trojan26 - my boat ==== |
#16
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Testing Betteries
"Charles T. Low" wrote in message ... "Doug Dotson" wrote in message ... Load testers are good for starting batteries but don't really tell much for a deep cycle battery. Doug - s/v Callista ==== Doug, Any idea why is this? Is it possible to have good sg and still fail a load test? I.e., is a load test more sensitive than sg? (I presume that sg is more specific than measuring voltage?) Does it go like that, in terms of accuracy?: The discharge time of a deep cycle battery is influenced by many things other than SG. The condition of the plates etc all come into play. While one may be able to draw heavy current for a brief period that does not necessarily translate into good low power performance. A long term low current test tells the actual story since it is how the battery is being used in normal use. The SG gives the state of charge from a theoretical sense as does the voltage. voltage specific gravity load testing??? Will an appliance such as a commerically bought load tester be more or less accurate than doing a long, slow test oneself, such as by leaving lights on? A load tester (at least the ones I have seen) can't tell what the capacity of the battery is. They just give a general idea that the battery is chemically and physically sound. I built a system a few years ago that would discharge a battery at a specified rate and then automatically recharge it all while monitoring. It graphically showed the capacity of the battery. It was also useful for reconditioning and breaking in batteries. (And, one other poster mentioned testing down to 50% charge as more convenient than testing to 0% charge - isn't it also true that testing to 0% charge will ruin the battery?) 0% charge and running it all the way down are not the same. 0% discharge is usually considered to be 10.5v. That is why I figure 50% is good enough. 50% is generally considered the lowest a battery should be discharged in normal use so doing so will tell what the useful capacity is. Charles (So many questions, such limited memory capacity...) ==== Charles T. Low - remove "UN" www.boatdocking.com www.ctlow.ca/Trojan26 - my boat ==== |
#17
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Testing Betteries
"Charles T. Low" wrote in message ... "Doug Dotson" wrote in message ... Load testers are good for starting batteries but don't really tell much for a deep cycle battery. Doug - s/v Callista ==== Doug, Any idea why is this? Is it possible to have good sg and still fail a load test? I.e., is a load test more sensitive than sg? (I presume that sg is more specific than measuring voltage?) Does it go like that, in terms of accuracy?: The discharge time of a deep cycle battery is influenced by many things other than SG. The condition of the plates etc all come into play. While one may be able to draw heavy current for a brief period that does not necessarily translate into good low power performance. A long term low current test tells the actual story since it is how the battery is being used in normal use. The SG gives the state of charge from a theoretical sense as does the voltage. voltage specific gravity load testing??? Will an appliance such as a commerically bought load tester be more or less accurate than doing a long, slow test oneself, such as by leaving lights on? A load tester (at least the ones I have seen) can't tell what the capacity of the battery is. They just give a general idea that the battery is chemically and physically sound. I built a system a few years ago that would discharge a battery at a specified rate and then automatically recharge it all while monitoring. It graphically showed the capacity of the battery. It was also useful for reconditioning and breaking in batteries. (And, one other poster mentioned testing down to 50% charge as more convenient than testing to 0% charge - isn't it also true that testing to 0% charge will ruin the battery?) 0% charge and running it all the way down are not the same. 0% discharge is usually considered to be 10.5v. That is why I figure 50% is good enough. 50% is generally considered the lowest a battery should be discharged in normal use so doing so will tell what the useful capacity is. Charles (So many questions, such limited memory capacity...) ==== Charles T. Low - remove "UN" www.boatdocking.com www.ctlow.ca/Trojan26 - my boat ==== |
#18
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Testing Betteries
These voltages are for liquid lead-acid batteries. Gels and AGMs
are somewhat lower. My AGMs rest at 12.6v when fully charged. Doug s/v Callista "Garland Gray II" wrote in message news:IFEQb.11797$dd6.309@lakeread02... A battery test in an old Ample Power catalog was to charge to 14.4 volts and hold it there for an hour. Let it rest overnight, and then retest. 12.8 v & higher=good 12.6 to 12.7v=marginal 12.4 to 12.6v=very poor less than 12.4 v=worthless "Rick & Linda Bernard" wrote in message ... Anyone have a good way of testing 12V deep cycle batteries? What I was figuring on doing was using a 50watt 12V lightbulb and measuring voltage with time. The only problem is that this may take a few hours. |
#19
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Testing Betteries
These voltages are for liquid lead-acid batteries. Gels and AGMs
are somewhat lower. My AGMs rest at 12.6v when fully charged. Doug s/v Callista "Garland Gray II" wrote in message news:IFEQb.11797$dd6.309@lakeread02... A battery test in an old Ample Power catalog was to charge to 14.4 volts and hold it there for an hour. Let it rest overnight, and then retest. 12.8 v & higher=good 12.6 to 12.7v=marginal 12.4 to 12.6v=very poor less than 12.4 v=worthless "Rick & Linda Bernard" wrote in message ... Anyone have a good way of testing 12V deep cycle batteries? What I was figuring on doing was using a 50watt 12V lightbulb and measuring voltage with time. The only problem is that this may take a few hours. |
#20
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Testing Betteries
Thanks; I forgot to mention that.
"Doug Dotson" wrote in message ... These voltages are for liquid lead-acid batteries. Gels and AGMs are somewhat lower. My AGMs rest at 12.6v when fully charged. Doug s/v Callista "Garland Gray II" wrote in message news:IFEQb.11797$dd6.309@lakeread02... A battery test in an old Ample Power catalog was to charge to 14.4 volts and hold it there for an hour. Let it rest overnight, and then retest. 12.8 v & higher=good 12.6 to 12.7v=marginal 12.4 to 12.6v=very poor less than 12.4 v=worthless "Rick & Linda Bernard" wrote in message ... Anyone have a good way of testing 12V deep cycle batteries? What I was figuring on doing was using a 50watt 12V lightbulb and measuring voltage with time. The only problem is that this may take a few hours. |
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