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Old 04-11-2016, 09:55   #211
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Re: What is your Real Amp Hour per Day Usage

Quote:
Originally Posted by Sandero View Post
You can produce your own project use... for each draw on the boat... lights, instruments, pumps and so on... and then size your charging accordingly and the batteries of course.

Do it yourself. If you are up to owning a running a boat... you need to have the intelligence and independence to be self sufficient... and don't expect others to tell YOU want to do with YOUR boat.
Not Nice Sandero.
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Old 04-11-2016, 11:26   #212
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Re: What is your Real Amp Hour per Day Usage

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Originally Posted by weavis View Post
Not Nice Sandero.
If I may differ?

Quote:
Originally Posted by Sandero View Post
You can produce your own project use... for each draw on the boat... lights, instruments, pumps and so on... and then size your charging accordingly and the batteries of course.

Do it yourself. If you are up to owning a running a boat... you need to have the intelligence and independence to be self sufficient... and don't expect others to tell YOU want to do with YOUR boat.
To the point Sandero and good advice.

Quote:
Originally Posted by Pete O Static View Post
So, after 40 plus years of sailing, I don't expect "others to tell me what to do with my boat" but I am interested in the results others have experienced with theirs.

It is beyond me why this thread seems to attract such condescending responses.
Not nice Static. The fact that after 40 plus years you have to compare yours results with others means that you are still uncertain about your installation. And what “40 years” got to do about getting it right? Learning requires a change of behaviour and may entails others to tell you what to do with your boat.

Quote:
Originally Posted by SV THIRD DAY View Post
There was a little shock in another thread about the amount of power used on a daily basis by a Cruising Boat. Of course it will vary depending on if you are at anchor for the Day or Underway with all the electronic nav equipment and autopilot running. Number of crew also matters. So does having a wind vane vs electric autopilot. Refrigeration or no refrigeration. So to help those in the planning stages what do those out cruising or living aboard full time find to be their average power usage for Living at Anchor and While Underway?

Our data:
Crew of 4
Refrigerator and Freezer, electric Autopilot.
Living at anchor: 200-250AH/day
While Underway 300-400AH/day
The original post is about power (not about, quote: peoples real world experiences because solar depends on so many variables, such as panel placement, wiring, geographic location, installation etc.) and gets mixed up by most people quoting installed capacity.
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Old 04-11-2016, 12:01   #213
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Re: What is your Real Amp Hour per Day Usage

I'm not using very much in the way of amps at all just now.... The fridge is toast and the fridge mechanic has buggered off to Bolivia, the heater is ashore at the last port... as is the wind gen.... meanwhile she is tide rode and the rain is coming in the back door... oh joy....
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Old 04-11-2016, 15:39   #214
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Re: What is your Real Amp Hour per Day Usage

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I'm not using very much in the way of amps at all just now.... The fridge is toast and the fridge mechanic has buggered off to Bolivia, the heater is ashore at the last port... as is the wind gen.... meanwhile she is tide rode and the rain is coming in the back door... oh joy....
So, tell me Ping: are you having fun yet?

That sounds pretty crappy to me, mate... sorry to hear of all the problems.

I'll pass on your news to the Comedy Net tomorrow.

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Old 04-11-2016, 18:10   #215
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Re: What is your Real Amp Hour per Day Usage

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Originally Posted by chala View Post
people quoting installed capacity.
Should read: people quoting used capacity.
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Old 05-11-2016, 04:24   #216
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Re: What is your Real Amp Hour per Day Usage

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Nothing is stopping you for contributing positively to this thread.
Thing is I have no real world experience, just got my boat getting her ready to "Go" I have to build up a system from scratch. I'm going to start with 4-6v Gel golf cart batteries and maybe 4-600 watts of solar with an MMPT charger.

Thats all I got for now.

So my contributions to this particular topic aren't really worthwhile.

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Old 05-11-2016, 05:45   #217
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Re: What is your Real Amp Hour per Day Usage

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So, tell me Ping: are you having fun yet?

That sounds pretty crappy to me, mate... sorry to hear of all the problems.

I'll pass on your news to the Comedy Net tomorrow.

Jim
It only hurts when I larf.......

Not real problems ... not hot enough to need the fridge, not cold enough to need the heater.. may have to run the Honda today though as after 36 hours here with no input from anything the batts are down a bit.

A month of sunshine and then when I go sailing....

Light southerlies forecast from manana so sun and clear blue skies to blow us back to Montt over the next 10 days ...
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Old 05-11-2016, 06:07   #218
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Re: What is your Real Amp Hour per Day Usage

I suppose someone will add a clock dsoftware and a logger functiob to measure daily amp consumption and then you can know...
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Old 06-11-2016, 05:32   #219
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Re: What is your Real Amp Hour per Day Usage

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Originally Posted by Salty Mike View Post
Thing is I have no real world experience
Then you may have little misconceptions this is good.
Here for a start.

Quote:
Originally Posted by Sandero View Post
You can produce your own project use... for each draw on the boat... lights, instruments, pumps and so on... and then size your charging accordingly and the batteries of course.
Also known as, Boat electrical budget, Load Calculations, etc and Maximum Demand calculations. All electrical installations require a Maximum Demand calculation.
There are many rules for determining a maximum demand. In an electrical installation supplied by batteries I use amps, the highest current that an appliance will use and do not include starting current. For example the current for a BD35F refrigerator Direct Current Compressor do fluctuate but the highest current is 5.95 amps @ 2500 rpm.

Quote:
Originally Posted by twelve View Post
I hadn’t thought about Mainesail’s concern regarding the high discharge rate (40 amps)
A case of not having done a maximum demand calculation.

Quote:
Originally Posted by Salty Mike View Post
So my contributions to this particular topic aren't really worthwhile.
Who said that? We just will have to wait.

This may help.

Google search.
Boat electrical budget. West marine
Yacht power consumption calculator.
Boat Electrics; How to Calculate Your Daily Amp Requirement
http://www.cruisersforum.com/forums/...ing-34621.html
Boat wattage.
How To Calculate Amp Usage Aboard a Boat
http://www.sbccsail.org/presentation...BCC%202016.pdf
Marine electrical systems pdf.
E-9.8. LOAD CALCULA TIONS https://law.resource.org/pub/us/cfr/....E-09.1990.pdf

And as a primer.
How to calculate battery run-time when design equipment using batteries; Battery Technical Resources for Design Engineers from PowerStream
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Old 06-11-2016, 06:31   #220
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Re: What is your Real Amp Hour per Day Usage

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Originally Posted by Sandero View Post
I suppose someone will add a clock dsoftware and a logger functiob to measure daily amp consumption and then you can know...
Is it what you are thinking of?

Keeping Your Battery Monitor More Accurate Photo Gallery by Compass Marine How To at pbase.com
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Old 06-11-2016, 22:40   #221
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Re: What is your Real Amp Hour per Day Usage

The terms power and energy are frequently confused.
Power = the rate of doing work, the rate of consuming or transferring energy, is measured in watts.
The rate at which work is done equals the product of voltage and current. P = V * A.

Quote:
Originally Posted by SV THIRD DAY View Post
There was a little shock in another thread about the amount of power used on a daily basis by a Cruising Boat.

So to help those in the planning stages what do those out cruising or living aboard full time find to be their average power usage for Living at Anchor and While Underway?

Living at anchor: 200-250AH/day
While Underway 300-400AH/day
Was SV confused and meant to write energy instead of power? He definitely quoted energy usage.

Quote:
Originally Posted by Stevens 47 View Post
Winter in Mexico last used about 95 amps per 24 hour period.
Summer in the SOC used up 120 amps during the hottest period.

While underway the autopilot and nav system uses about between 9-12 amps per hour additional.
Quote:
Originally Posted by barnakiel View Post
About 20 A / day anchored.
About 15 A / day sailing.
Both quoted power and did not need to be corrected.
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Old 06-11-2016, 23:48   #222
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Re: What is your Real Amp Hour per Day Usage

Quote:
Originally Posted by chala View Post
Power = the rate of doing work...
Quote:
Originally Posted by Stevens 47
Winter in Mexico last used about 95 amps per 24 hour period.
Summer in the SOC used up 120 amps during the hottest period.

While underway the autopilot and nav system uses about between 9-12 amps per hour additional.


Quote:
Originally Posted by barnakiel
About 20 A / day anchored.
About 15 A / day sailing.


Both quoted power and did not need to be corrected.
Sigh! Earwig Ho agen.

Neither quoted power.
You don't "use" power, you use energy. As you correctly state, Power is a RATE of doing work (a.k.a. amount of energy consumed per unit time).

You can't "use" Amps or Watts over a time period. So talking of usage in terms of Amps/day or Amps/hr demonstrates a failure to comprehend the difference between power and energy.

The problem is that when it is done incorrectly like this you have to try to interpret what Barnakiel meant by "15 A / day sailing"


Is he a very heavy energy user or a very light user?

Did he mean that he consumed 15 Amp hours per day? ( in which case he is in the very low energy consumption group). Or was his average consumption over the 24 hours 15 Amps? (in which case he consumed 360 Amp hours per day and is more towards heavy energy user end of the spectrum).
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Old 06-11-2016, 23:55   #223
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Re: What is your Real Amp Hour per Day Usage

Quote:
Originally Posted by chala View Post
Was SV confused and meant to write energy instead of power? He definitely quoted energy usage.
Either confused or just unaware of the correct terminology.
But if we are really interested, from his figures we can tell his power demand. (Although his energy usage, as per the Thread Title in this case is far more important)

Living at anchor: 200-250AH/day = an average power demand of 8.3-10.4 Amps

While Underway 300-400AH/day = an average power demand of 12.5 - 16.7 Amps.
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Old 07-11-2016, 00:06   #224
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Re: What is your Real Amp Hour per Day Usage

But be aware that the people who wrote some of those references are also very confused about the difference between Amps and Amp hours and use them incorrectly in many places. (FWIW, I wouldn't put too much faith in advice from sources which can't even get the basic units right)
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Old 07-11-2016, 00:12   #225
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Re: What is your Real Amp Hour per Day Usage

[QUOTE](FWIW, I wouldn't put too much faith in advice from sources which can't even get the basic units right)/QUOTE]

Careful, Stu, for that was a premise that I posted way back in the beginning of this thread, and I was well flamed for such an attitude!! Mea culpa and all that, but I sure agree with you!

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