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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #11  
Old 10-17-2008
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IMHP if a battery needs to be on a charger all the time it is shot

I have no problems with batterys that sit all winter unhooked and just do a charge in the spring


In taking care of Emgerancy Lighting systems which could not treat a battery better they still wear out and fail endurance testing
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  #12  
Old 10-17-2008
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IF that is the spec for the charger, it isn't a wonder that it is overheating...it is designed for 250 Amp-hours of battery bank, and his is near 500 Amp-hours... double the design specification.

Quote:
Originally Posted by waltsn View Post
Is this the spec for the charger?

"Fully Automatic - Designed to maintain 12 volt batteries up to 250 amp hours
Increase Performance - Precision regulated 13.4 VDC float mode. Can be left on for extended periods without overcharging or damaging batteries. Will not drain battery if AC is removed. LED status indicator. User adjustable for gel's.
Built-in Safety - Reverse polarity protected. Certified to U.L. 1236 Marine."

Id leave it connected to your battery bank for a while longer and see what happens. If its regulated, you should be able to leave it connected and forget about it. Getting very hot should be watched carefully but it may just be that the "little" charger is trying to bring 500 amp hours of battery up to charge (which exceeds the spec) and they may have been low in the first place.

The one thing which I would be slightly worried about is temperature. The charger looks like it may not have temperature compensation and battery charging voltage's are temp sensitive. They need to be lower for high temps, higher for low temps. I would guess however if your batteries are in your garage or similar, no matter how cold a place where you live, you likely wont have a problem.
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Old 10-17-2008
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Quote:
Originally Posted by waltsn View Post
Id leave it connected to your battery bank for a while longer and see what happens. If its regulated, you should be able to leave it connected and forget about it. Getting very hot should be watched carefully but it may just be that the "little" charger is trying to bring 500 amp hours of battery up to charge (which exceeds the spec) and they may have been low in the first place.
that's the part I don't get. if it is supposed to put out certain amount of amps, it should just stop at those amps and keep putting them out waiting for batteries to come up to desired voltage. why would it overheat unless improperly regulated? It may not be able to bring batteries to desired voltage in a short amount of time (or any amount, for that matter) but this should not cause overheating in properly designed device (incidentally, batteries were up to it's "float" voltage of 13.3v in less than an hour, one would expect the device to cool down after that at least - but that did not happen either)

Quote:
The one thing which I would be slightly worried about is temperature. The charger looks like it may not have temperature compensation and battery charging voltage's are temp sensitive. They need to be lower for high temps, higher for low temps. I would guess however if your batteries are in your garage or similar, no matter how cold a place where you live, you likely wont have a problem.
batteries are in my house, where temperature is pretty constant. in any case, it only goes up to float voltage of 13.3v which is presumably the same regardless of temperature. really all I need is to counteract internal battery discharge. Presumably all I need is about 20-40 amp/hours per month, i.e. no more than 40 hours of charging total at 1amp rate.
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Old 10-17-2008
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I not sure if someone answered the question and I just seen it.
The Promarier 1.5 is designed for "1" battery. No more. I looked at some of the owner's manuals on-line and even some of the 6 amp chargers are for only "1" battery no more. Some more expensive models can charge 2 or more batteries depending on the charger's specs. The 1.5 amp trickle charger that sell for $30-40 +/- only charge one battery at a time.
Hope this help, but, maybe I misunderstand the question.
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well, ok - that's what I am trying to understand - what is it that makes them "for one battery". Would they continue raising the amps beyond 1.5amp specified? They certainly do not raise the voltage, nor are they supposed to.

This is what I want - I do want no more than 1.5amp (preferably 1amp) to be going into batteries. 5-6amps is way too much for a maintenance charge. My only concern is the temperature of the device.
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This what I know. I have an old Automatic charger from many years ago. It charge 6 or 12 volts and I can select 2-4-6 amps. I like to charge on the lowest setting of 2 amps. This charger also have the old amp meter (needle that move to show amps). Some times when a battery first connected it will throw the needle over to 10 amps and sometimes peg out. Then it slowly move down eventually stabilizing around my 2 amp setting. Then as the battery charge the meter will drop to almost 0 amps in time.
The charger you have I not see a meter on the one I looked at, so, it could be the battery in charge pulling more than the 1.5 amps. I can not say if it will damage the charger. But, I would assume if you connect only one battery it may be hot until it stabilize, but, I not want to bet money it not cause damage to the charger. I really never used one like you have (Or what I looked at and assume you have). Wish I could tell more.
I will add; there will be some heat, which is normal. That from changing AC to DC and the circuitry involved. Which in the case of a trickle charger is probably most a Coil like those glowing space heaters we use. And a few Diodes
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Last edited by Gryzio; 10-17-2008 at 08:50 PM.
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I hope this help

I try to post a .gif image and explain.
This a simple trickle charger. Notice T1?
This the coil or technical Transformer. Normally, I would say it an isolation transformer as it separate the AC. The AC transfers from the coil on left to the coil on right this "may" protect the circuit from overload, but, no promise. D1 and D2 are diodes to make AC flow in one direction to make DC and the R1 is the voltage drop resistor. This picture is 23 volt, but, the transformer and resistor can be change to do whatever. I try not to be too tech, just a quick explain without the Electronic Theory.
Too much amp pull could make enough heat to burn/open the coil on right.
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Trickle charger-charger.gif  
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Last edited by Gryzio; 10-17-2008 at 09:13 PM.
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Most one battery chargers are designed to charge ONE BATTERY BANK, which may consist of one or more batteries.
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  #19  
Old 10-17-2008
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Years ago I got tired of taking the batteries off the boat each winter and reinstalling them every spring. For the last few years I have been using one of these solar chargers to keep the batteries up over the winter. I just plug it in to the 12 receptacle at the helm and bungee cord it to my cabin top. Each spring I have fully charged batteries and she starts right up when she is launched. Sunsei Solar Charger SE-500

Last edited by bubb2; 10-17-2008 at 09:37 PM.
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Have you thought of having your batteries tested? and then fully charged before you put on the trickle charger. The portable charger I bought for home use, you set it for type of the battery then start the charge it will stop if it finds a fault or otherwise unable to compleate the charge. It gives alot of info and cost $70. I have taken some to battery-mart they run the test and tell you if they work ok or not you can then decide if you want to replace or not.
I know others are saying use on only one battery, But if they are fully charged and have no internal shorts ( this normaly happens on old or damaged batteries) One amp is one amp. I think for some reason your battery is taking more than that. I think one or more if them need replacing. I would have them tested if I dont have the stuff.
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