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Old 10-22-2011, 09:32 PM   #11
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We live in kingston ontario where temperature rarely dips below -20 celcius or 0 fareneith. I like the timer idea.
Yeah, but then you get one cold snap and you are worried about the battery.

I had a thread about this last winter: Leaving trailer on A/C power long term
What I ended up doing was bringing the battery into the house and setting it on a couple of small 2x4s in the basement. As a cheap option for an intelligent batter charger, I plugged in an old cell phone using a car charger. I got the adapter for the cigarette port from Princess Auto.

Every so often I would charge the battery. I also put a regular 120 volt lamp in the trailer for when I had to go inside, and flipped the breaker for the power converter.

Remember; just because something won't kill your battery, it doesn't mean it is good for it either. It's nice to be on your 3rd day of dry camping the next year and find you still have plenty of power left.
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Old 10-22-2011, 10:07 PM   #12
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Cold batteries take longer to charge. If you have someplace indoors to keep it then do so. Check it every 2 or 3 months & if it requires a charge use a slow charge.
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Old 10-23-2011, 08:00 AM   #13
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Take the battery from your trailer and bring it in your basement. Dont leave it on the cement floor. Put it on a wood board or similar and each month check the voltage. If you get below 12.5 volts give it a trickle charge with one amp charger. Dont use a high amp charger because of the sulfuric fumes it can develop.
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Old 10-23-2011, 08:18 AM   #14
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Dont leave it on the cement floor.
Why not? Just curious. I thought the "battery on concrete" thing was outdated.
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Old 10-23-2011, 08:51 AM   #15
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From Interstate batteries web site,

Interstate Batteries FAQ :: Does it hurt my car battery if I set it on concrete?

Oddly enough, I cant find anything about this question on Diehard, Trojan, Maxx, etc.

I except the answer that it is ok to store on concrete however, I always put a block of wood under it because I dont want to risk any stains on the concrete.
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Old 10-23-2011, 09:01 AM   #16
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Take the battery from your trailer and bring it in your basement. Dont leave it on the cement floor. Put it on a wood board or similar and each month check the voltage. If you get below 12.5 volts give it a trickle charge with one amp charger. Dont use a high amp charger because of the sulfuric fumes it can develop.
REF: Deep Cycle Battery FAQ

Myth: The old myth about not storing batteries on concrete floors is just that - a myth. This story has been around for 100 years, and originated back when battery cases were made up of wood and asphalt. The acid would leak from them, and form a slow-discharging circuit through the now acid-soaked and conductive floor.

Battery Charging

Battery charging takes place in 3 basic stages: Bulk, Absorption, and Float.

Bulk Charge - The first stage of 3-stage battery charging. Current is sent to batteries at the maximum safe rate they will accept until voltage rises to near (80-90%) full charge level. Voltages at this stage typically range from 10.5 volts to 15 volts. There is no "correct" voltage for bulk charging, but there may be limits on the maximum current that the battery and/or wiring can take.
Absorption Charge: The 2nd stage of 3-stage battery charging. Voltage remains constant and current gradually tapers off as internal resistance increases during charging. It is during this stage that the charger puts out maximum voltage. Voltages at this stage are typically around 14.2 to 15.5 volts.
Float Charge: The 3rd stage of 3-stage battery charging. After batteries reach full charge, charging voltage is reduced to a lower level (typically 12.8 to 13.2) to reduce gassing and prolong battery life. This is often referred to as a maintenance or trickle charge, since it's main purpose is to keep an already charged battery from discharging. PWM, or "pulse width modulation" accomplishes the same thing. In PWM, the controller or charger senses tiny voltage drops in the battery and sends very short charging cycles (pulses) to the battery. This may occur several hundred times per minute. It is called "pulse width" because the width of the pulses may vary from a few microseconds to several seconds. Note that for long term float service, such as backup power systems that are seldom discharged, the float voltage should be around 13.02 to 13.20 volts.
Chargers: Most garage and consumer (automotive) type battery chargers are bulk charge only, and have little (if any) voltage regulation. They are fine for a quick boost to low batteries, but not to leave on for long periods. Among the regulated chargers, there are the voltage regulated ones, such as Iota Engineering and Todd, which keep a constant regulated voltage on the batteries. If these are set to the correct voltages for your batteries, they will keep the batteries charged without damage. These are sometimes called "taper charge" - as if that is a selling point. What taper charge really means is that as the battery gets charged up, the voltage goes up, so the amps out of the charger goes down. They charge OK, but a charger rated at 20 amps may only be supplying 5 amps when the batteries are 80% charged. To get around this, Statpower (and maybe others?) have come out with "smart", or multi-stage chargers. These use a variable voltage to keep the charging amps much more constant for faster charging.
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Old 10-23-2011, 10:15 AM   #17
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Great info!
But... I find it all very confusing, lots to choose from.
I would really prefer leave the battery on and connected.
Can I leave the trailer connected to the house and run power to it about 2 hours a day?
will this be enough to keep the battery charged? I realize most people prefer to take the battery off and store it but can I do this safely without harming anything?
Also, do I turn the trailer breakers off or leave them turned on?
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Old 10-23-2011, 11:10 AM   #18
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Quote:
Originally Posted by boubou View Post
Great info!
But... I find it all very confusing, lots to choose from.
I would really prefer leave the battery on and connected.
Can I leave the trailer connected to the house and run power to it about 2 hours a day?
will this be enough to keep the battery charged? I realize most people prefer to take the battery off and store it but can I do this safely without harming anything?
Also, do I turn the trailer breakers off or leave them turned on?
Sure, why not, leave it plugged in, batteries connected and once a week go out and flip the breakers on. You might want to check your battery now and then to make certain the fluid is still covering the plates. You might also want to do a voltage check to see that all is well. If the fluid level exposes the plates/straps, add water and if you don't get full charge, leave the breakers on a couple of hours longer. ***Check battery voltage after the batteries have been off the charger for at least three hours.*** Read the URL I posted earlier about battery FAQ's.

If leaving it in the TT fails, which could happen even if you removed the battery and kept it on low voltage float charge inside, get a new battery in the spring. I have to keep reminding myself, "KISS" Keep It Simple Stupid.
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Old 10-23-2011, 11:19 AM   #19
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IMO a Battery Minder is far and away the best solution to winter storage. I disconnect the battery from the trailer and hook up the Battery Minder. Not only is your battery kept in peak charge but it adds anti-sulfation tecnhology. I use the this product on all of my "occasional use" batteries. Motorcycle, tractors, lawn tractor. My batteries are always ready to go and they last "forever". My motorcyle battery is 10 years old and still works just fine.
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Old 10-23-2011, 11:30 AM   #20
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IMO a Battery Minder is far and away the best solution to winter storage. I disconnect the battery from the trailer and hook up the Battery Minder. Not only is your battery kept in peak charge but it adds anti-sulfation tecnhology. I use the this product on all of my "occasional use" batteries. Motorcycle, tractors, lawn tractor. My batteries are always ready to go and they last "forever". My motorcyle battery is 10 years old and still works just fine.

Yes, the Battery Minder is the best for battery longevity, just remember to check battery fluid level now and again.
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