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Go Back   SailNet Community > On Board > Gear & Maintenance > Electrical Systems > Electrical requirements
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Thread: Electrical requirements Reply to Thread
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Topic Review (Newest First)
10-21-2011 10:38 AM
mitiempo He will need an AC charger to go with the generator - the DC output from a gen like the Honda 2000 will do almost nothing.
10-21-2011 09:55 AM
SeaDreamer1Day Tabrar,

If you are trying to avoid running a petrol powered generator you are going to need a lot of batteries. That being said, your best bet is going to be using a battery bank that fits nicely in the boat without compromising the boats safety and / or performance. Add to that 3 charging sources:

1. Whatever solar that you can fit that will work (i.e. not be shaded).
2. A wind generator.
3. A petrol generator whether an alternator off the main engine or a stand-alone generator. There is much discussion on this topic here. If you use the search function you can find plenty of reading.

With these installed on the boat, you have a lot more flexibility. If the weather is right, the solar / wind combination will take care of a large amount of your charging needs. The petrol generator can be ran to give the batteries a "quick charge" if they get run down too much.

The batteries can then be topped off using any of the 3 above or shore power when available. This would be a very reasonable solution that would appear to meet your needs.
10-20-2011 12:52 PM
denverd0n
Quote:
Originally Posted by tabrar View Post
Since after 2 day i can have a rest of 4 days so kindly guide me about the solar panel and other details that are necessary for that.
As I said before, the math is pretty simple. I gave you all the information that you need to figure this out for yourself.
10-20-2011 10:55 AM
mitiempo Depending on supplemental charging from solar cannot be relied on. The continuous draw of 250 watts - about 20 amps - will require a battery bank larger than 1500 AH. 2000 AH is closer but even that may not be enough. I hope the boat is large enough to carry over 1200 lbs of batteries. Not to mention the expense. A generator is a much better solution, combined with a charger.
10-20-2011 10:29 AM
noelex77
Quote:
Originally Posted by tabrar View Post
Since after 2 day i can have a rest of 4 days so kindly guide me about the solar panel and other details that are necessary for that.
i can charger the battery on a shore so tell me about the batteries also
Without shore power
You need to generate on average about 170 AHrs a day. To do this in a sunny climate would only require about 500w of solar, but to be able to do this year round in most locations 1500-2000w will be needed.
The battery bank will need to be about 1500Ahrs

With shore power every night you do need any solar power and the battery bank alone would be enough.
10-20-2011 03:28 AM
tabrar Since after 2 day i can have a rest of 4 days so kindly guide me about the solar panel and other details that are necessary for that.
i can charger the battery on a shore so tell me about the batteries also
10-20-2011 03:10 AM
noelex77 To have a solar system that will replace a continous load of 250w in most location in any season will be very large someting like 3 to 4 KW would be a good starting point. There is not enough room on even a large cataman for this much solar power.

A small generator is your your only practical solution if you want to provide this sort of power in the less sunny parts of the world.

If you are using the camera for 2 days. Then not using it over a longer period. The power for the cameras can be supplied by a large battery bank, with a smaller solar array gradually replacing the power.
The duty cycle is important, 2 days use and how many days rest? You also need to account for other loads such as lights etc.
10-20-2011 02:39 AM
tabrar
Solar energy

Quote:
Originally Posted by noelex77 View Post
The watt rating printed on the side of equipment (which I presume is what you are quoting) often indicates the maximum current draw. The average power used may be significantly lower. You need to measure this. A clamp on ammeter is the easiest way

The time you are using the camera and the rest time between uses is also important to work out your requirements.
.
Solar production is very dependent on location and time of year.

Without these sort of details we can only guess at a system to meet your needs


I have camera that carries a load of 250Watts as i checked.
now my boat might go on a remote location for 2 day.
i want that my camera that is connected to the battery only will work for 2 day only.
the remote location can be any where.
10-19-2011 06:25 AM
mikefossl I've just gone through as similar exercise to increase my charging capacity. I jumped back and forth from generator to bigger alternator to second alternator. I'm not sure how your boat is set up but it is usually possible to add a second alternator to the PTO pulley on the engine if there's room. You'll need a dual pulley for anything over 120 amps. You might also consider AGM batteries which have a much higher acceptance rate then flooded.

In the end I went with a 160 amp replacement for my standard alternator using a serpentine belt kit. There may be one available for your engine which should allow up to a 180 amp alt. I also have 660 amp hours of AGM house and 370 watts of solar. We have DC refrigeration and a watermaker but still only use maybe 100-150 amps per day. No washing machine.
10-19-2011 01:59 AM
noelex77 The watt rating printed on the side of equipment (which I presume is what you are quoting) often indicates the maximum current draw. The average power used may be significantly lower. You need to measure this. A clamp on ammeter is the easiest way

The time you are using the camera and the rest time between uses is also important to work out your requirements.
.
Solar production is very dependent on location and time of year.

Without these sort of details we can only guess at a system to meet your needs
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