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Inverter Selection For Your Boat

For a long time I have been a 12 volt man on board our trawler, the Patricia Ann. Twelve volt DC systems were always easy, safe and functioned well. But after a recent 5-day journey on board our yacht where we had to repeatedly power up the generator to deliver electrical power to the 115 volt ac freezer to maintain temperatures, I started to think about alternate options. We put over ninety hours on the genset in just 5 days; time for a new oil change!

So I began to consider installing an inverter to power the freezer. But what is an inverter in any case? An inverter is an electrical piece of equipment that turns battery direct current (dc) power to alternating current (ac). But there are a lot of alternatives from which to select, where do I start? When it comes to picking a power inverter for your yacht, the alternatives can be perplexing. With a lot of alternatives on the market, it is valuable to understand what the variations are so that you are able to make the best choice for your particular yacht application.

Your first concern will be wattage. Inverters are sized by the wattage they can handle. Consider what items you will be running and how many amps each item calls for. You will need to also think about the number of them you will be running at once to ascertain what size inverter will be the right one for your requirements. You do not want to overload your inverter by turning on many high wattage items at once. You will probably observe that the price tag of inverters rise with the quantity of wattage. You can find the wattage by looking at the manufacturer's label on the appliance. If merely the amps are shown use the formula (amps x 115 volts= wattage) to change to watts.
The next concern will be if you ought to purchase a true sine wave inverter or a modified sine inverter. A true sine inverter is one that will provide you with a nice current exactly like you get from the power company. A modified sine inverter is to some extent less pure. The modified sine inverter was developed as a less expensive option to the true sine inverter. You will discover that even though the pure sine inverter will give the finest electric current, it too will be the most expensive. An 1800 watt modified sine inverter will cost you about $350.00.

While the modified sine inverter is less expensive, it has its individual issues. For most small appliances, for instance a refrigerator or hair dryer, a modified sine inverter is going to be adequate. On the other hand, with a few gadgets like plasma televisions you could notice a lack of precision. In this situation a true sine inverter might be a superior solution to ensure that you can enjoy a superior quality output. It is additionally key to keep in mind that a modified sine inverter can't be upgraded to a true sine inverter. You will want to make certain you are buying the correct inverter for your vessel's needs at the start.

It is a good idea to inquire about overload turn off indicators or switches on your inverter just in case you overload the inverter; many inverters will have them as standard equipment. You may also want to investigate to discover if the inverter has thermal and short circuit shut down to prevent those kinds of emergencies as well. Additionally, a few inverters have built-in shut down features if the battery storage levels reach a certain low point.

I chose to install a Xantrex 1800 watt modified sine inverter able to provide 1000 watts of continuous load. This inverter has a built-in transfer switch that transfers between shore and inverter power.

The final consideration is the battery set aboard your trawler you will be drawing from. Your inverter is going to be pulling from this battery bank and you should have the ability to compute the time period the inverter can run before a recharge must take place. Look at your battery to locate the amp-hours for them. Amp-hours mean amps time hours. A battery bank of 2 8D batteries will have about 580 amp hours.

So I know that my freezer draws 2 amps and runs for 20 minutes each hour which equals roughly 7 hours per 24 hours. So the total amp-hours the freezer will utilize per 24 hours are 14. So technically we could operate the inverter for approximately 41 days without a recharge, but should we?
It isn't good to run a battery all the way down to zero. Battery life is directly linked to how deep the battery is cycled every occasion. If a boat battery is discharged to 50% each day, it will endure about twice as long as if it is cycled to 80% of full discharge each day. If cycled only ten percent of discharge, it will go on around 5 times as long as one cycled to fifty percent. This does NOT suggest you are not able to go to 80% occasionally. It's simply that you should have some idea of the loads. You should plan on a typical discharge of roughly 50% for the best storage vs cost factor. Also, there is an upper threshold - a battery that is continually cycled 5% or less will as a rule not endure as long as one cycled down 10%. This takes place because at extremely shallow cycles, the lead dioxide tends to develop on the positive plates. I choose to cycle my batteries down 20% before recharging.

Checking your batteries can be estimated but I choose to use a Trimetric 2025 monitoring device. This electronic apparatus enables me to monitor the battery banks amp-hours use accurately.

With some cautious preparation, an inverter can make a boat cruise a more enjoyable experience. After you choose the inverter that is right for your vessel, ensure to have it properly installed. If you aren't sure about working with electricity, it will probably be best to employ a specialist do the task for you. Then you can be underway way knowing that you have what you require to keep your vessel operating on enough power.

We went on another four-day trip over the New Year holiday with our new inverter and I am happy to say we only operated the genset six hours in four days. Life is good.

By: Marinetrader

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Mike Dickens, the author, is a live aboard boat owner and owner/Broker of Paradise Yachts in Florida USA. Paradise Yachts offers used quality yachts to customers worldwide. 904/556-9431 Visit the Paradise Yachts website to view our selection of Used Trawlers, Used Motor Yachts, and Used Sailboats for Sale National and international sales. We ship Used Trawlers, Motor Yachts and Cruisers worldwide. Located in Florida, USA. 904/556-9431 Interact with us at the Trawler Blog

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