Texas Two Steppers
Beaumont, TX
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DW bought a single cup coffee maker that draws 150 amps @12v for about a minute and a half. The draw is not constant but pulsates for about 20 second bursts at a time. My system is 440 amp hrs (4-6v Interstates). 1 cup is generally made around 6:00am, 7:00am and 8:00am. Has worked fine for several days when boondocking. This morning my system was down to about 92% from the night before and when I make the early cup the Magnum went off under low battery which I have set at 11.0 volts. Is this too much of a draw for battery health and/or can I lower the LBCO a little more?
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LittleBill
Scranton, PA USA
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what wire guage you have between the magnum and the battery's and how long of a run?
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Texas Two Steppers
Beaumont, TX
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LittleBill wrote:what wire guage you have between the magnum and the battery's and how long of a run?
2/0 6-7 ft.
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mena661
Southern California
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Texas Two Steppers wrote:LittleBill wrote:what wire guage you have between the magnum and the battery's and how long of a run?
2/0 6-7 ft. 1.3% voltage drop. Should be good. Might be pushing it on the current handling capacity (depends on what the insulation is rated at). I think 4/0 is typically recommended by the manufacturers for 2000W inverters.
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pianotuna
Regina, SK, Canada
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Hi,
Six volt jars don't like the rate of discharge so they exhibit voltage drop. Try monitoring the voltage while running the pot. If the batteries "bounce" back in voltage after the load try 10.5 volts on the inverter.
The real solution is two more batteries.
Regards, Don
Kustom Koach Class C 28'5" 256 watts Unisolar, 875 amp hours in two battery banks 12 volt batteries, 2500 MSW watt inverter.
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garym114
Bluff Dale, Texas
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You just have to realize what is going on.
When you have a high draw on the batteries, the battery voltage drops under load. How much it drops depends on the original charge level and the amps being drawn. The battery voltage will go back up after the coffee maker is done.
You can either silence the alarm or drop the alarm level and take a look at battery voltage after it sits for a while.
Sit back and enjoy the coffee.
I don't think you need larger cable or more batteries. System respond this way. It's probably the highest amp draw your system sees. I see the same thing with six batteries and a high current draw with 4/0 cable. The voltage goes back up with reduced load.
* This post was
edited 05/25/12 08:13am by garym114 *
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janstey58
Glenwood, IA
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Texas Two Steppers wrote:DW bought a single cup coffee maker that draws 150 amps @12v for about a minute and a half.
Bad info here, your RV is only wired for 30-50 Amps, outlets are fused for 20 Amps. If this were true (150A), it would blow all breakers.
Jeff and Kim
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garym114
Bluff Dale, Texas
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janstey58 wrote:
Bad info here, your RV is only wired for 30-50 Amps, outlets are fused for 20 Amps. If this were true (150A), it would blow all breakers.
It draws 150 amps at 12 volts, not 110v.
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mena661
Southern California
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janstey58 wrote:Texas Two Steppers wrote:DW bought a single cup coffee maker that draws 150 amps @12v for about a minute and a half.
Bad info here, your RV is only wired for 30-50 Amps, outlets are fused for 20 Amps. If this were true (150A), it would blow all breakers. He said in the first post that it was 150 amps at 12V.
pianotuna wrote:Hi,
Six volt jars don't like the rate of discharge so they exhibit voltage drop. So do 12V's and according to a test here (that you were involved in also), the difference was negligible between the 6's and 12's. Also, there are tons of people here (you might know one....BFL13??), that do this very successfully on 6's.
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Texas Two Steppers
Beaumont, TX
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mena661 wrote:janstey58 wrote:Texas Two Steppers wrote:DW bought a single cup coffee maker that draws 150 amps @12v for about a minute and a half.
Bad info here, your RV is only wired for 30-50 Amps, outlets are fused for 20 Amps. If this were true (150A), it would blow all breakers. He said in the first post that it was 150 amps at 12V.
The 150 amps@12v is derived from the Trimetric.
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