Electrical requirements

[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.

[denverd0n]

Originally Posted by 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.

As I said before, the math is pretty simple. I gave you all the information that you need to figure this out for yourself.

[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.

[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.