E-Meter - Revision history

69.228.204.183: added PakTrakr

2007-04-12T19:55:00Z

added PakTrakr

2007-04-06T17:26:11Z

added microlog

2007-04-06T17:17:57Z

2007-04-06T17:03:46Z

added rc-electronics

2007-01-29T01:05:22Z

2007-01-29T01:03:08Z

Added Smart Gauge

2007-01-26T01:02:03Z

wikipedia interwiki link fix

2007-01-26T00:25:29Z

2007-01-26T00:24:54Z

2007-01-23T18:15:06Z

Added Gordon Stallings battery moniitor

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 * Build it yourself battery monitor for multi-battery packs http://home.earthlink.net/~evtkw/ Includes plans schematics and details - by Tim Wong
 * Gordon Stallings battery monitor with schematics http://genki.home.ionet.net/BattMon/BattMonArticle.html
 * Smart Gauge (UK) http://www.smartgauge.co.uk/ Great technical info on how battery monitors work.
 * http://www.rc-electronics-usa.com/ammeters/rv-battery-monitor.html

@@ Line 15: / Line 15: @@
 * Build it yourself battery monitor for multi-battery packs http://home.earthlink.net/~evtkw/ Includes plans schematics and details - by Tim Wong
 * Gordon Stallings battery monitor with schematics http://genki.home.ionet.net/BattMon/BattMonArticle.html
 * Smart Gauge (UK) http://www.smartgauge.co.uk/ Great technical info on how battery monitors work.
 * http://www.rc-electronics-usa.com/ammeters/rv-battery-monitor.html
+* http://www.micromediaplus.com/microlog_dmm-3_dmm-4.html
 * http://www.rotordesign.com/s10/cellmon/cellmon1.pdf schematic for battery low voltage threshold indicator
 [[Category:BEV components]]

← Older revision		Revision as of 17:17, 6 April 2007
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	* http://www.rc-electronics-usa.com/ammeters/rv-battery-monitor.html		* http://www.rc-electronics-usa.com/ammeters/rv-battery-monitor.html
		+
		+	* http://www.rotordesign.com/s10/cellmon/cellmon1.pdf schematic for battery low voltage threshold indicator

	[[Category:BEV components]]		[[Category:BEV components]]

← Older revision		Revision as of 17:03, 6 April 2007
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	* Smart Gauge (UK) http://www.smartgauge.co.uk/ Great technical info on how battery monitors work.		* Smart Gauge (UK) http://www.smartgauge.co.uk/ Great technical info on how battery monitors work.
		+
		+	* http://www.rc-electronics-usa.com/ammeters/rv-battery-monitor.html

	[[Category:BEV components]]		[[Category:BEV components]]

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 In a nutshell, it measures the current flow into and out of the battery pack.  The thing is that the effective capacity of a lead-acid battery is dependent on the rate at which it's discharged.  A simplified example:
-A 100 Ah (amp-hour) battery can provide 1 amp for 100 hours, or 2 amps for 50 hours, or 5 amps for 20 hours.  That's the theory.   In actuality, the more current you draw, the lower the actual capacity you get out.  So, you may get 1 amp for 100 hours, but 5 amps for only 19 hours, and instead of 50 amps for 2 hours, you'd only get 50 amps for 1 hour.  This is known as the [[Wikipedia:Peukert's Law]].
+A 100 Ah (amp-hour) battery can provide 1 amp for 100 hours, or 2 amps for 50 hours, or 5 amps for 20 hours.  That's the theory.   In actuality, the more current you draw, the lower the actual capacity you get out.  So, you may get 1 amp for 100 hours, but 5 amps for only 19 hours, and instead of 50 amps for 2 hours, you'd only get 50 amps for 1 hour.  This is known as the [[Wikipedia:Peukert's Law|Peukert's Law]].
 Anyhow, an e-meter not only measures the total amps that go into (charging) and out of (discharging) a battery, but takes into account the rate that it's used, and uses Peukert's empirical formula to calculate the effective charge, giving a more accurate indication of the battery's true state of charge (SOC).

← Older revision		Revision as of 01:03, 29 January 2007
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	* Gordon Stallings battery monitor with schematics http://genki.home.ionet.net/BattMon/BattMonArticle.html		* Gordon Stallings battery monitor with schematics http://genki.home.ionet.net/BattMon/BattMonArticle.html
		+
		+	* Smart Gauge (UK) http://www.smartgauge.co.uk/ Great technical info on how battery monitors work.

	[[Category:BEV components]]		[[Category:BEV components]]

@@ Line 3: / Line 3: @@
 In a nutshell, it measures the current flow into and out of the battery pack.  The thing is that the effective capacity of a lead-acid battery is dependent on the rate at which it's discharged.  A simplified example:
-A 100 Ah (amp-hour) battery can provide 1 amp for 100 hours, or 2 amps for 50 hours, or 5 amps for 20 hours.  That's the theory.   In actuality, the more current you draw, the lower the actual capacity you get out.  So, you may get 1 amp for 100 hours, but 5 amps for only 19 hours, and instead of 50 amps for 2 hours, you'd only get 50 amps for 1 hour.  This is known as the [[http://en.wikipedia.org/wiki/Peukert's_Law|Peukert's Law]].
+A 100 Ah (amp-hour) battery can provide 1 amp for 100 hours, or 2 amps for 50 hours, or 5 amps for 20 hours.  That's the theory.   In actuality, the more current you draw, the lower the actual capacity you get out.  So, you may get 1 amp for 100 hours, but 5 amps for only 19 hours, and instead of 50 amps for 2 hours, you'd only get 50 amps for 1 hour.  This is known as the [[http://en.wikipedia.org/wiki/Peukert's_Law Peukert's Law]].
 http://en.wikipedia.org/wiki/Peukert's_Law

← Older revision		Revision as of 00:24, 26 January 2007
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	An '''E-meter''' measures the state of charge of batteries.		An '''E-meter''' measures the state of charge of batteries.
		+
		+	In a nutshell, it measures the current flow into and out of the battery pack. The thing is that the effective capacity of a lead-acid battery is dependent on the rate at which it's discharged. A simplified example:
		+
		+	A 100 Ah (amp-hour) battery can provide 1 amp for 100 hours, or 2 amps for 50 hours, or 5 amps for 20 hours. That's the theory. In actuality, the more current you draw, the lower the actual capacity you get out. So, you may get 1 amp for 100 hours, but 5 amps for only 19 hours, and instead of 50 amps for 2 hours, you'd only get 50 amps for 1 hour. This is known as the [[http://en.wikipedia.org/wiki/Peukert's_Law\|Peukert's Law]].
		+	http://en.wikipedia.org/wiki/Peukert's_Law
		+
		+	Anyhow, an e-meter not only measures the total amps that go into (charging) and out of (discharging) a battery, but takes into account the rate that it's used, and uses Peukert's empirical formula to calculate the effective charge, giving a more accurate indication of the battery's true state of charge (SOC).
		+
		+	Short version: Battery Fuel Gauge.

	A commonly used E-Meter for electric vehicles it the Xantrex Link-10. http://www.xantrex.com/web/id/237/p/1/pt/5/product.asp		A commonly used E-Meter for electric vehicles it the Xantrex Link-10. http://www.xantrex.com/web/id/237/p/1/pt/5/product.asp

← Older revision		Revision as of 18:15, 23 January 2007
Line 7:		Line 7:

	* Build it yourself battery monitor for multi-battery packs http://home.earthlink.net/~evtkw/ Includes plans schematics and details - by Tim Wong		* Build it yourself battery monitor for multi-battery packs http://home.earthlink.net/~evtkw/ Includes plans schematics and details - by Tim Wong
		+
		+	* Gordon Stallings battery monitor with schematics http://genki.home.ionet.net/BattMon/BattMonArticle.html

	[[Category:BEV components]]		[[Category:BEV components]]