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Ah, that's the part I was missing. From what others have told me, the average on the "high" setting is about 45 minutes, longer on the slower pitches. I think the standard battery that comes with the Dacor/Apollo is a 12V, 24 amp hour battery. Thanks, Art. -----Original Message----- From: kirvine@sa*.ne* [mailto:kirvine@sa*.ne*] Sent: Monday, November 22, 1999 4:44 PM To: Paltz, Art Cc: Mailing Tech Diver List (E-mail) Subject: Re: Question about the battery tester.... Art, I'll guess it at about 25 amps on the highest pitch setting. The tester will be a long haul since the wattage at that voatge and resistance is too small relative to the battery capacity. You could put two of them in series and get a great test on both at the same time - they should go 120 minutes like that, and you can put the meter on each one to see how they are doing. Paltz, Art wrote: > > Thanks George. Great explanation! > > Looks like I have to start ordering some components and test out my battery > over the winter. > > Anyone want to compare draw times when the tester is completed? I'd like to > know how the draw time with 1.5 Ohms of resistance compares to real life for > a Dacor/Apollo. Unless someone knows the draw of the Dacor motor on it's 3 > settings? Naturally averaged with the typical stokified gear setup..... > :-) Anyone from a shop know the typical draw of the motor, maybe someone > who sells them? > > Thanks again George! > Art. > > -----Original Message----- > From: kirvine@sa*.ne* [mailto:kirvine@sa*.ne*] > Sent: Monday, November 22, 1999 3:40 PM > To: Paltz, Art > Cc: techdiver@aquanaut.com > Subject: Re: Question about the battery tester.... > > That is my battery tester you are looking at. It is simply > two 300 watt > 3 ohm resistors in parrallel giving 1.5 ohms of resistance . > The voltage > is not an issue. If you burn a 12 volt battery it is still > subject to > V=IR, and you merely time how long that "R" goes for and > compare it to > the curve supplied with the batteries. > > We chose that combination of resistors to match the draw of > a DV100 > scooter motor. The new motors that I make draw 2 amps less > for the same > thrust, and peak much lower. This test gives us a "worst > case" burn for > our scooters, which actually floats with drag, which of > course the DIR > system minimizes. > > In your case, as you said, the objective is to just see how > the battery > compares to its rating. > > For 12 volt light battery testing, the array happens to > mimick a 100 > watt halogen bulb time-wise, and if you just use one of the > resistors ( > there is a disconnnect bettween them in my setup), you will > get the 50 > watt light time or the Mako motor time. Howver, why do the > long test > when you can factor the times using the discharge curve of > the battery. > > If you really want to roll on the floor laughing, look at > how the usdct > tested theirs or how the other guys who make them test > theirs. I came up > with these numbers based on dynamic testing using a long > harness and > remote guages so I could ride the scooter at different > settings and gear > configs. As you know, doing what I do with a scooter means I > need to > know exactly what that piece of equipment will do, and our > tests turn > out to be right on the money in real life diving. > > I am used to claiming ignorance on issues of cave trade > secrets, but > that is not so necessary anymore. Actually , all of my stuff > is > incorporated into the GUE scooter course , and we even > filmed me > teaching part of it with Errol , but that is not available > outside of > the organizations. > > Paltz, Art wrote: > > > > George, > > > > It's mentioned at the bottom of this web page that you're > the EE guru. > > Being that you make your scooters I'd say that makes you > pretty much a guru. > > > > The battery drain/tester on > http://www.bentleytech.com/resistor/index.html > > <http://www.bentleytech.com/resistor/index.html> says > it's for 24V > > Gavin/Mako scooters. Can it be used to test a 12V Dacor > if it's drained to > > 10V? I have a new battery in the scooter and I'm getting > poor performance > > from it. This gizmo looks simple to make and test. I > just don't know if I > > would need to modify the resistors to account for a 12V > battery. As you can > > tell, I'm not an EE type. I just know how to solder > wires.... > > > > I also assume it won't accurately mimic a Dacor motor for > burn time but at > > least I can cycle the battery and assume I've got an > optimal charge. Might > > be fairly close though. > > > > Thanks, > > Art. > -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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