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#31
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Spring Cleaning and Battery Testing
On 3/19/2011 5:40 PM, Paul Remde wrote:
Hi Eric, Thanks. I'm a little surprised you use the 4A charger. The largest one I sell so far is a 2 A charger. Are you charging multiple batteries with the same charger at once? Or do you have a very large capacity battery? The ASH 26 E can carry two 12 volt, 18 AH batteries, which I do. These batteries can be charged at 4 amps; since I charge them in parallel, I could actually use an 8 amp charger, and that's one reason I'm attracted to the Batteryminder 12248. -- Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me) - "Transponders in Sailplanes - Feb/2010" also ADS-B, PCAS, Flarm http://tinyurl.com/yb3xywl - "A Guide to Self-launching Sailplane Operation Mar/2004" Much of what you need to know tinyurl.com/yfs7tnz |
#32
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Spring Cleaning and Battery Testing
On 3/19/2011 5:40 PM, Paul Remde wrote:
Hi Eric, Thanks. I'm a little surprised you use the 4A charger. The largest one I sell so far is a 2 A charger. Are you charging multiple batteries with the same charger at once? Or do you have a very large capacity battery? The ASH 26 E can carry two 12 volt, 18 AH batteries, which I do. These batteries can be charged at 4 amps; since I charge them in parallel, I could actually use an 8 amp charger, and that's one reason I'm attracted to the Batteryminder 12248. -- Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me) - "Transponders in Sailplanes - Feb/2010" also ADS-B, PCAS, Flarm http://tinyurl.com/yb3xywl - "A Guide to Self-launching Sailplane Operation Mar/2004" Much of what you need to know tinyurl.com/yfs7tnz |
#33
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Spring Cleaning and Battery Testing
I should have posted this link before. Here's an excellent document
describing all aspects of SLA batteries from construction to use/ca http://www.power-sonic.com/images/po...hManual-Lo.pdf |
#34
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Spring Cleaning and Battery Testing
Hi,
Nice document. I'll add that to my Power-Sonic web page. Good Soaring, Paul Remde Cumulus Soaring, Inc. "Westbender" wrote in message ... I should have posted this link before. Here's an excellent document describing all aspects of SLA batteries from construction to use/ca http://www.power-sonic.com/images/po...hManual-Lo.pdf |
#35
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Spring Cleaning and Battery Testing
On Mar 16, 11:20*pm, SP wrote:
On Mar 16, 7:01*pm, Nyal Williams wrote: I know nothing about battery technology. *I take my batteries to Battery Plus, who claims that they can recondition batteries and bring them up to their proper rating. *Sometimes I get a battery back with the indication that it is at say 113%; if the work brings it back to less than 95% there is no charge and I throw it away. *The cost last year was $5.00 per battery that came out well. Am I getting good value? At 00:40 17 March 2011, brianDG303 wrote: On Mar 16, 4:00=A0pm, ContestID67 *wrote: Each year I like to test my batteries and replace those that do not have enough capacity for a typical flight of 3-4-ish hours with all the electronics running. I run two batteries so that removes a worry about loosing power during a record flight. =A0But how do you perform a good real world test? My test is basically connecting a resistive load to the battery, measure the battery voltage every 10 minutes or so. =A0Then wait for the battery voltage to drop to 11.5Vdc (an arbitratry but safe value). Simple. I create an Excel spreadsheet that explains all this - the testing that I perform, the test rig that I used and templates for gathering the data and then graphing the results. =A0 Seehttp://aviation.derosaweb.= net/#batterytest. I=92d love to hear any comments that you might have. =A0Enjoy. John DeRosa Johnderosaweb.com John, I have used that method and it works well, but............. First, as I am sure you know, you want a load that is similar to the real-life load. *I use a 12 volt lamp (AKA light bulb) and because I have a lot of stuff I use a 10 watt lamp to create a 830 mA load which is about what I pull. If you are testing every 10 minutes you are working kind of hard. *My battery, a 12120, takes hours to run down. 11.5 volts cut off is way too conservative. *The published data curve for the 12120 ................................wait, I am wrong. I looked it up and I use 11.8 volts. but 11.5 is fine as well. I use an Eagle Tree MicroPower V3 logger and get a computer generated log of the discharge. *Then I fly with the logger and get an idea of my real-world consumption and compare the two. *Works great. *Others use a pretty common logger with a built-in load, I prefer the Eagle Tree because it will log a flight one day and a battery the next. Do you do your test in cold air to simulate high altitude, or just room temp? ps. If you are replacing the 12120 battery look at the 12140 or the 12150. *Same size, heavier, and more capacity. Brian Has anyone tried a LiFePO4 battery such as the Shorai brand that can be seen at:http://www.batterystuff.com/batterie...L2-BS12.html*? Weight of the 12v 14ah LiFePO4 battery is 1.6 lb vs 13 lb for a sealed lead acid battery. And, it's smaller. Steve Steve, I just bought a 4500 mAh 4-cell LiFe battery from Hobby King, the Hongkong supplier of RC equipment that I have bought LiPo's from before. Here is the link: http://www.hobbyking.com/hobbyking/s...dProduct=16201 I got two of these and connected them is series. Discharge tests using the Eagle voltage and amperage recorder mentioned in this thread indicate they have the stated capacity. They discharge at a very flat and constant voltage. Will use these as my primary battery for instrumentation and radio. I have a 10AH NiMH battery dedicated to the transponder.and a stand-by battery in the tail (also NiMH) in case the LiFe goes dead. Herb, J7 |
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