also, breakers in small format are available
On Mar 11, 2019, at 10:30 AM, oak oak_box@yahoo.com [electricboats] <electricboats@yahoogroups.com> wrote:<quarterviewbb.jpg>One other thing that I forgot to mention:They make fuses that you can mount directly on the battery terminal for normal "car" type (or marine) batteries. If your motor draws 42A max, you could put a 100A fuse on each battery. That would hopefully prevent a catastrophe from happening if you have the batteries tied in parallel, and one of them shorts out.On Monday, March 11, 2019, 12:02:41 PM CDT, captnlen trikini2008@embarqmail.com [electricboats] <electricboats@yahoogroups.com> wrote:Thanks for education. Isn't a sailboat and will use on a 4000 Acre lake (Lake June in Winter, and Lake Placid (about same size) In Highlands County Fl both ramps very close(one walking distance), just for fishing a day or two a week. there are 100 lakes in county and most have public ramps and are much smaller.
<quarterviewbb.jpg>If you are planning to get deep cycle batteries, I would definitely recommend AGM batteries. They won't leak, and you don't have to worry about them being heeled over. :)Next, you need to understand the concept of "Peukert Effect" - at least at a layman's level.The "Peukert Co-efficient" of the battery tells you how well the battery can discharge at high amperage levels.Here's a web page to reference:https://www.batterystuff.com/kb/tools/peukert-s-law-a-nerds-attempt-to-explain-battery-capacity.htmlBottom line - Batteries do not discharge linearly. For example:Assume you can apply a 20A load to your car battery for one hour before it is depleted to 50%.You might expect that you could apply a 40A load for a half hour before discharging the batter to the same level.But that is not the case. With twice the load (in the real world) - you might only get 20-25 minutes, instead of 30.The details depend on the load and the specific battery.Lithium batteries typically have a lower Peukert coefficient than lead batteries - and thus much less affected by this issue.AGM batteries typically are better than traditional flooded lead acid batteries.Bottom line - the lower the load you apply to your batteries, the longer they will last.So - putting your two banks in parallel will generally give you a longer run time than running one battery, then switching to the second battery. In real life, you might see a 20% difference in run time.That having been said... if you're not going to run the batteries completely down during your trip, those of us that are paranoid still like the idea of holding one of the banks in reserve.If you only have two battery banks, having a Batt1/Batt2/off/BOTH switch can be a nice thing.The one thing to be CAREFUL about here is that you do NOT want to parallel two LARGE battery banks that are at different voltage levels!!! Sparks can fly... If you parallel two battery banks that are at different voltage levels, the higher voltage battery will immediately try to discharge as fast as possible into the lower voltage battery to raise it's voltage. For example, if you have one battery that goes dead with a shorted cell, and flip your switch to put it in parallel with a large fully charged battery, the good battery will try to flood the dead battery with all the amps it possibly can. In EXTREME cases, the battery cables will overhead, and possibly start a fire. For this reason, it is NOT a good idea to leave your battery switch in the "BOTH" position when you leave the boat. You might be tempted to so that a single trickle charger could charge both batteries - but it's a BAD idea. Buy 2 trickle chargers.On solar panels....It depends.It depends on the battery chemistry - AGM batteries are probably much more tolerant of cheap solar charging panels. If you use Lithium batteries, you should invest in a GOOD charger.It depends on how deeply you discharge your batteries. If you only use the batteries to get in and out of the marina, and do not heavily discharge them, then a modest solar panel will do just fine.It also depends on how long you have for the batteries to charge. If you only sail on the weekends, or not more than once or twice a week, a solar panel should be able to top off your batteries during the week while you are gone. If you want to sail daily, or if you deeply discharge a large bank, you'll need a lot more panel acreage to manage your needs.One other side topic to mention - since you are using this on a SAILBOAT.Be aware that when you are SAILING - just a little bit of power on your electric motor can help increase your sailing speed by .5-1mph, and will make tacking in light air substantially easier.If you have a trolling motor or outboard that you can fully pull out of the water, it's not as much of a gain. However, if your prop stays in the water - just a small amount of electric power changes the prop from being a "brake" to providing helpful assistance. It's a BIG win.Note - we're talking about a small amount of power to augment your sailing. And at LOW power settings, your battery will last a LONG time - again, a good gain!Good luck!John-- Capt.Len Susman Rtd Trikini Trimarans
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Posted by: Rob <rob@sail4life.net>
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