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Search: Posts Made By: scraph
Forum: Electronics   04-05-2011
Replies: 14
Views: 1,917
Posted By scraph
It is really irrelevant to my point what value...

It is really irrelevant to my point what value the battery tester at Autozone gives you for MCA. MCA is calculated by determination of conductance of the battery and correlating that with measured...
Forum: Electrical Systems   04-05-2011
Replies: 23
Views: 67,877
Posted By scraph
And according to these fellows you multiply by...

And according to these fellows you multiply by 0.4167: How can I convert 25 amp Reserve Capacity to Amp Hours at a 25 amp discharge rate? | Discover Energy...
Forum: Electrical Systems   04-05-2011
Replies: 23
Views: 67,877
Posted By scraph
I'm still curious who these genius theorists are...

I'm still curious who these genius theorists are who claim 'you can just divide it by 2 ... or maybe add 16 also' ... what on earth?!

I heard this theory that you can divide inches by 12 to get...
Forum: Electrical Systems   04-05-2011
Replies: 23
Views: 67,877
Posted By scraph
You're correct above. The purpose of...

You're correct above.

The purpose of "reserve capacity" is essentially for automobile applications. It is a measure of how many minutes a car battery should be able to maintain above 10.5V if the...
Forum: Electrical Systems   04-05-2011
Replies: 23
Views: 67,877
Posted By scraph
They may not be the same number but they do...

They may not be the same number but they do measure similar things. Reserve Capacity is usually the number of minutes a battery can deliver at a '25-amp rate' ... so multiply the number of minutes by...
Forum: Electronics   04-05-2011
Replies: 14
Views: 1,917
Posted By scraph
Well, there we have it folks ... no need to...

Well, there we have it folks ... no need to equalize your lead-acid batteries. They'll be fine.

Seeing as not 'bursting open in the winter' isn't the only standard by which to judge a battery and...
Forum: Electronics   04-05-2011
Replies: 14
Views: 1,917
Posted By scraph
Those freezing points given are only relevant if...

Those freezing points given are only relevant if the electrolyte in the battery is uniformly mixed. Between the combined effects of cold conditions, idle batteries, and no periodic equalizing charge...
Forum: Gear & Maintenance   04-02-2011
Replies: 1,406
Views: 501,489
Posted By scraph
That's not a pulley! That's a sheave. ;)

That's not a pulley! That's a sheave. ;)
Forum: Gear & Maintenance   04-02-2011
Replies: 174
Views: 14,308
Posted By scraph
Well, yes ... I am. I've never used an Active-X...

Well, yes ... I am. I've never used an Active-X but I have used ESM plenty and simply being alerted to the presence of a radar signal is the key feature that we'd find use for! You don't really need...
Forum: Gear & Maintenance   04-01-2011
Replies: 174
Views: 14,308
Posted By scraph
The Echomax Active-X active radar reflector has...

The Echomax Active-X active radar reflector has the capability to produce an audible alert whenever it is painted by a radar signal. It doesn't tell you much (range, rate, type, number) but it does...
Forum: Gear & Maintenance   04-01-2011
Replies: 174
Views: 14,308
Posted By scraph
If your MBP 15" has the standard size battery...

If your MBP 15" has the standard size battery then that battery is 60W-hr

Dividing that by 12V and 14.3V ... we see that it looks like anywhere between a 4.2Ahr and a 5Ahr to your DC bus.

Best...
Forum: Electronics   04-01-2011
Replies: 25
Views: 7,973
Posted By scraph
It's a good ammeter ... just an old one....

It's a good ammeter ... just an old one. Calibration is out of date :) It was reading fine at the higher ends of the scale but not so hot at the lower. Thanks for the heads up on my ammeter, fellows....
Forum: Gear & Maintenance   04-01-2011
Replies: 174
Views: 14,308
Posted By scraph
Well, that is ridiculous! In what sort of world...

Well, that is ridiculous! In what sort of world can you be one without the other? Wrong information is never helpful. If you want to be helpful ... it is far more important to be right than to give...
Forum: Gear & Maintenance   04-01-2011
Replies: 174
Views: 14,308
Posted By scraph
On Navy vessels, we have a general classification...

On Navy vessels, we have a general classification of equipment installed providing ESM (Electronic Support Measures). This equipment provides active emissions detection and classification. We know if...
Forum: Electronics   04-01-2011
Replies: 25
Views: 7,973
Posted By scraph
I'm not telling people to use my numbers. I never...

I'm not telling people to use my numbers. I never did. I'm telling people to measure their own numbers ... and then there has been a whole lot of back and forth on how to measure those numbers. This...
Forum: Gear & Maintenance   04-01-2011
Replies: 174
Views: 14,308
Posted By scraph
Your computer draws about 2.2A to run itself and...

Your computer draws about 2.2A to run itself and only to run itself... and can swing up to 4 amps during periods of higher processor load.

Your computer will run off its battery for 1.5-2 hours...
Forum: Gear & Maintenance   04-01-2011
Replies: 174
Views: 14,308
Posted By scraph
There absolutely are efficiency losses associated...

There absolutely are efficiency losses associated with operation of the inverter, the laptop battery charger, and with charging a battery. I understand that as well.

The 'not quite' you are...
Forum: Electronics   04-01-2011
Replies: 25
Views: 7,973
Posted By scraph
They absolutely do serve different functions. His...

They absolutely do serve different functions. His suspicion is that I was only measuring current through the yellow wire (which receives constant supply in most installations and is used to maintain...
Forum: Electronics   04-01-2011
Replies: 25
Views: 7,973
Posted By scraph
Taking the difference in current draw between 50%...

Taking the difference in current draw between 50% volume and 0% volume:

0.522A - 0.453A = 0.07A which can be attributed to the current specifically required to produce the sound at this volume...
Forum: Gear & Maintenance   04-01-2011
Replies: 174
Views: 14,308
Posted By scraph
If you can determine a good average value of...

If you can determine a good average value of current draw while the laptop is running then you can still use that average value to estimate power requirements, whether or not you run the laptop...
Forum: Gear & Maintenance   04-01-2011
Replies: 174
Views: 14,308
Posted By scraph
No, it won't provide a good value for the power...

No, it won't provide a good value for the power required only to run the laptop... and that would be a ridiculous way to determine that value especially since it is possible (and much easier) to...
Forum: Gear & Maintenance   04-01-2011
Replies: 174
Views: 14,308
Posted By scraph
Exactly! ... then why isn't that getting across...

Exactly! ... then why isn't that getting across to you the fact that the large majority of current draw that you're seeing is to charge the battery and not to actually operate the notebook! You even...
Forum: Gear & Maintenance   04-01-2011
Replies: 174
Views: 14,308
Posted By scraph
Well, you're getting into questions of power...

Well, you're getting into questions of power supply efficiencies. I'll concede that to you. Good data, sir.
Forum: Gear & Maintenance   04-01-2011
Replies: 174
Views: 14,308
Posted By scraph
No, sir. You don't need to over-think and I...

No, sir. You don't need to over-think and I really wish others would stop confusing the topic by under-thinking it.

It doesn't matter at all whether you use the laptop plugged in or not. The...
Forum: Seamanship & Navigation   04-01-2011
Replies: 41
Views: 4,909
Posted By scraph
*sigh* Is it really appropriate to question my...

*sigh* Is it really appropriate to question my level of experience because an example that I've provided for sake of example doesn't represent the traffic that you see in your neck of the woods?
...
Showing results 1 to 25 of 167

 
 
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