Digital vs. Analog engine gauges - Page 2 - SailNet Community

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  #11  
Old 09-04-2012
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Re: Digital vs. Analog engine gauges

The analog tape gauges (or vertical rectangles described above) were used in high performace aircraft in the 50's and 60's when jets started to come on the scene. The aligned gauges reduced pilot workload considerably since they did not have to think about what each gauge was telling them. They could identify the problem reading and evaluate quickly.

Sailing or motoring along at 6 kts is not quite the same as dogfighting at hudreds of miles per hour, but it is nice to be able to take a glance at your engine instruments and know if everything is OK.
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  #12  
Old 09-04-2012
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Re: Digital vs. Analog engine gauges

"Sailing or motoring along at 6 kts is not quite the same as dogfighting at hudreds of miles per hour, "
Easy for you to say, nick. But I dare say a dogfighter never had to contend with keeping one eye on the engine for the better part of an whole hour, while the giant kraken were attacking the helm from all sides seeking shelter from a squall.
And then of course, if that distracts you too long and you wander into "Here Be Dragons"...good lord, when you see the Krakens slither off and disappear, you just know something bad's going to happen.
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Old 09-05-2012
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Re: Digital vs. Analog engine gauges

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Originally Posted by hellosailor View Post
"So it seems the current draw isn't an issue."
Not with an LCD that has no backlight. A backlight can pull 40-120mA all by itself, way way more than the LCD does.
According to Cruz Pro:
"The current that our LCD voltmeters draw is very low however (only about 0.035 amps) at maximum backlight intensity. Even a small 90 amp 12V battery would run the voltmeter for months."
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Old 09-05-2012
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Re: Digital vs. Analog engine gauges

That's great. Apparently they've got two well-behaved LEDs in there then, pulling 35mA. Which would still 25 amps if left alone for one month.

Similar to a car stereo or alarm system or old clock, enough to impact a less-than-perfect battery, but small enough to ignore for a week or three in healthier system, like the 90AH they mention.
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Old 09-06-2012
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Re: Digital vs. Analog engine gauges

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Originally Posted by hellosailor View Post
That's great. Apparently they've got two well-behaved LEDs in there then, pulling 35mA. Which would still 25 amps if left alone for one month.

Similar to a car stereo or alarm system or old clock, enough to impact a less-than-perfect battery, but small enough to ignore for a week or three in healthier system, like the 90AH they mention.
That's 35mA at full back light intensity, which (hopefully) would only be used while underway at night.
In any case, I went with the Microlog battery monitor mentioned in this interesting review. http://www.maxvu110.com/psbm.pdf. As the review says: A simple system for a simple boat (such as mine). It will give me Volts for each battery, and Amps from the alternator. Has low and high voltage alarms and I still have the factory Yanmar alarm (good for me, as I'm not one to watch gauges on a regular basis). Also made in Canada, not China (important to me). The one downside is that it needs to be mounted inside. However, I have limited cockpit mounting space anyway, so this wasn't a big drawback. I'll be able to see the Microlog from the cockpit anyway. The engine gauges will definitely go in the cockpit.
I found it interesting that the review stated proper installation of any of the systems would be unlikely by a weekend warrior. Microlog says it's a piece of cake. I'll find out!

Last edited by L124C; 09-06-2012 at 04:54 PM.
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Old 09-06-2012
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Re: Digital vs. Analog engine gauges

"I found it interesting that the review stated proper installation of any of the systems would be unlikely by a weekend warrior."

See, a true Weekend Warrior, aka National Guardsman, would only have his rifle and mess kit to work with. Neither of which is much use for electrical installations, unless you use the rifle to take hostages from an electrician's place. Which most NG won't do, as a mattter of principle, leaving them with no tools to do the job with.
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Old 09-06-2012
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Re: Digital vs. Analog engine gauges

I have been able to plug any motor function into my nmea 2000 GPS going back almost 7 years ?



To be honest i yet to bother moving the unit onto the Cal 29 as the handheld tells me enough and i would still want and need the POD

At the price of some of those gages you would be well into a 4" nmea 2000 dispay
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Old 09-18-2012
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Re: Digital vs. Analog engine gauges

Installed the Microlog battery monitor and Shunt. Piece of cake! I initially balked at the $90 price for the shunt, but it is a substantial piece of hardware. Looks like something a power company would use!
Microlog supplies everything needed except the ground wire to connect the shunt to the batteries. Ordered that from Genuinedealz.com, another great resource.
The Microlog Gives me:
Voltage of both batteries and high/low voltage alarm.
Charging (from all sources) and discharging rate in Amps.
The monitor can also be turned off (something I didn't pick up in the sales info).

Last edited by L124C; 09-18-2012 at 03:21 PM.
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Old 09-18-2012
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Re: Digital vs. Analog engine gauges

I've never seen the Microlog shunt, and for $90 a shunt could be custom sculpted and gold plated by a dedicated machinist.

But I have seen typical US-made shunts, and some cheapass Chinese shunts, and it doesn't take long to figure out which one is going to be more stable long-term. Sometimes quality tells. Good fitment, solid contacts, tight screw threads...If $90 is excessive, well, you've got to figure you're buying into their whole package, and it all should average out.

Of course, we also used to scavenge old toasters from the trash to get free nichrome wire (damned expensive to buy new!) and some stuff just gets sold for way more than what it would seem worth in this world.
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Old 09-23-2012
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Re: Digital vs. Analog engine gauges

Quote:
Originally Posted by L124C View Post
Installed the Microlog battery monitor and Shunt. Piece of cake! .
Oooops...spoke too soon. Turns out I didn't fully understand what I was doing. I think it was a combination of lack of understanding on my part, and possibly the directions not being quite clear enough for the novice electrician. I suspected as much, so I posted this thread:
How do Shunts work?
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