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Old 10-11-2017, 11:18 AM   #1
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Low Battery Voltage Cutoff

I apologize if this has been covered but my search result contained way too many threads to go through. My DC to AC power converter cuts out when the battery voltage reaches 10.6 volts. This is a great way to kill the lifespan of my battery. So I am looking for an inexpensive way to cut off supply once the voltage drops to 50%. I was thinking about getting a low voltage disconnect like this marine one -

https://www.bluesea.com/products/7635/m-LVD_Low_Voltage_Disconnect

Any thoughts on this? I want to know when I need to fire up the genny if the battery(ies) are getting dangerously low. Any low budget solutions out there short of building my own?

Thank you!
CamperDad
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Old 10-11-2017, 11:33 AM   #2
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That one is rated for 65 amps. That's a bit less the 800 watts.

What size is your inverter and how much do you draw thru it.
If its less then 800 watts, it will still work for you.
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Old 10-11-2017, 11:34 AM   #3
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Is your LBCO not adjustable
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Old 10-11-2017, 11:53 AM   #4
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What you are talking about is an Inverter, not a converter. And don't confuse battery voltage while under load to unloaded battery voltages for charge state. I suspect many battery voltages drop to 10.6 or lower while starting the vehicle, which is a very heavy load.
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Old 10-11-2017, 12:34 PM   #5
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Sorry you are correct tfryman . Inverter. To clarify, I have a 750 watt DC to AC inverter hooked to my 75AH deep cycle battery so I can run an AC powered fan (draws 1 amp) during the night in our trailer. I don't want to wake up to a dead battery. We might watch TV for a couple of hours and then sleep with a phone cellphones charging and the fan running.

The LVCO on this el cheapo one is none adjustable. (Although I might open it up and look around.)

This is on a travel trailer so it will not need to start anything. I just don't want to prematurely end its life.

Thanks again!
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Old 10-11-2017, 12:40 PM   #6
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Originally Posted by CamperDad View Post
Sorry you are correct tfryman . Inverter. To clarify, I have a 750 watt DC to AC inverter hooked to my 75AH deep cycle battery so I can run an AC powered fan (draws 1 amp) during the night in our trailer. I don't want to wake up to a dead battery. We might watch TV for a couple of hours and then sleep with a phone cellphones charging and the fan running.

The LVCO on this el cheapo one is none adjustable. (Although I might open it up and look around.)

This is on a travel trailer so it will not need to start anything. I just don't want to prematurely end its life.

Thanks again!
One amp at 120 volts is 10 amps at 12 volts. With only about 37 usable amps from your battery, even if your battery is fully charged, you have about four hours of run time on you AC fan.
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Old 10-11-2017, 12:54 PM   #7
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One amp at 120 volts is 10 amps at 12 volts. With only about 37 usable amps from your battery, even if your battery is fully charged, you have about four hours of run time on you AC fan.
Right you are. That is about what I figured with the battery fully charged. So in an effort to not have to set my alarm for 4 am or guesstimate what time the battery will go too low, I was looking for a low budget LBCO. If I were a frequent boondocker, I would have a bigger battery bank and better inverter but most of the time we have shore power. Our next trip I will only have generator power and I don't care to run a 3000 watt generator all night just to power a fan.

Thank you for chiming in!
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Old 10-12-2017, 08:43 AM   #8
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Smaller 12 volt fan or a couple.

LEN
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Old 10-12-2017, 09:38 AM   #9
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How about using a timer to shut it off after a period of time that would assure it didn't go below 50%. If you used a mechanical timer, there wouldn't be any additional use of the battery.
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Old 10-12-2017, 09:43 AM   #10
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One amp at 120 volts is 10 amps at 12 volts. With only about 37 usable amp-hours from your battery, even if your battery is fully charged, you have about four hours of run time on you AC fan.
FTFY

amps and amp-hours are not the same.
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Old 10-12-2017, 10:15 AM   #11
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FTFY

amps and amp-hours are not the same.
True, but if you draw 10 amps for 1 hour, that's 10 AH ( amp hours ). Run the fan for 4 hours and that's 40 AHs.
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Old 10-12-2017, 04:37 PM   #12
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I think I have found my low budget solution and will post the results after I have had a chance to test it. Thanks everyone for helping me think this out.
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Old 10-12-2017, 05:46 PM   #13
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Low Battery Voltage Cutoff

This works great for me to control how long battery chargers are in use. You just set the time to run your fan when you go to bed.

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Old 10-20-2017, 01:37 AM   #14
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Are you running the fan for cooling or white noise. We run a fan at home but use a little white noise generator I bought at Amazon in the trailer. The white noise machine will drown out a reefer running next to us in a rest area or a generator. It is rechargable, works like charging your cell phone. Was like $30USD. Sleep like a baby!
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