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Old 12-30-2019, 10:55 PM   #1
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90 watt TV drains batteries in 5 min?

I have 2, 12volt deep cycle batteries in parallel. They are almost 2 years old. They are fully charged to 13.5 volts.
They have 62 amp hours each, as per NAPA spec sheet.
Bought a cheep 400 watt inverter just to test the run time of the TV. The charts I've seen say it should run 4 hours aprox. On the battery bank.
I was shocked when it only lasted 5 min. Voltage got down to 10.5 volts.
Is this right or am I looking at the wrong chart?
These batteries are the stock ones on this new 2018 winnebago Vista we bought.
Any ideas. I have a battery load tester tool that shows they are in good condition. Anyone got any suggestions?
Mikee
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Old 12-30-2019, 11:08 PM   #2
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Iíd look for a different load tester! Sounds like bad batteries. To run them down in 5 minutes would take a load of 100+ amps.
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Old 12-30-2019, 11:16 PM   #3
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Could be batteries are not fully charged when you start. 13.5 volts indicates voltage was measured while charging. If so you must wait a few hours without charger before measuring initial voltage. Compare the static voltage after waiting for a few hours to the charge level chart.

It takes 14 to 18 hours of charging to fully charge any lead acid battery. Reaching 13.5 while charging does not indicate batteries are fully charged. It only means charger is able to supply as much charging current as the battery will take.

Voltage should drop some as soon as load is applied however dropping to 10.5 in 5 minutes indicates no actual capacity.

Could be the inverter is not the only load on the batteries. High current drain can cause voltage to drop substantially and quickly.

Battery University

https://batteryuniversity.com/
How does the Lead Acid Battery Work? https://batteryuniversity.com/learn/article/lead_based_batteries
Charging lead acid batteries https://batteryuniversity.com/learn/article/charging_the_lead_acid_battery
How to Charge and When to Charge? https://batteryuniversity.com/learn/article/how_to_charge_when_to_charge_table
Summary of Doís and Doníts https://batteryuniversity.com/learn/article/do_and_dont_battery_table
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Old 12-30-2019, 11:33 PM   #4
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Thanks for the reply & links. I know the batteries were fully charged. Rv had been plugged in for 8 hours and my renogy blue tooth charger app said I had 100 percent charge.
In your opinion, the 2 batteries in new condition should run the TV at least 1 hour, correct? It only draws 90 watts per the data plate.
Mikee
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Old 12-30-2019, 11:42 PM   #5
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Dennis, I'm leaning towards bad batteries. The Rv is new but it's been setting on the dealers lot since 2018. Probably not much battery charging/maintainince going on.
Load tester is old school style harbor freight. Clamp to battery post push button & metal strip in the tester turns red a dead short basically. Voltage meter shows slight drop after 15 seconds but still reads 12 volts with or without load.
Will probably take them to parts house & have them tested there.
Thanks for the reply. Mikee
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Old 12-31-2019, 12:18 AM   #6
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That HF tester is actually the right tool as it puts a proper 100A load on the battery, just be careful not to apply the load too long as I had something inside the case catch fire Sounds the batteries are good so don't take them out yet.

Do you regularly use the batteries when camping and they last fine ?

How did you wire the inverter and TV up ? All that charge must be disappearing somewhere. The TV should run for hours in the inverter.
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Old 12-31-2019, 03:39 AM   #7
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Are you plugging the whole RV into the inverter or just the TV power cord.

If your plugging the Shore cord in, your not just running that TV. You may be running the converter/charger and that's a circle of charging a battery with itself.

90 watts at 12 volts is 7.5 amps. Your TV should run 9 hours and only use 50% of your total battery capacity.

7.5 amps for 1 hour is 7.5 AH.
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Old 12-31-2019, 06:39 AM   #8
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Those were the factory installs in our 2018 Navion. They're a dual purpose, maintenance free Napa battery, and they worked adequately for about the first 15,000 miles of travel and average off grid (lights, water pump, and some small loads on a CSW1012 inverter), for us, in half a dozen trips of varying lengths, some a few days, others a few weeks. After another 9,000 miles, I decided to replace them, as I felt they were no longer reliable even with limited use. They aren't very robust, and 62Ah each wasn't enough for our us.
I guess I would now have to call them barely adequate, and I recently replaced them with lithium.
Don't know if this helps you decide what to do.
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Old 12-31-2019, 07:00 AM   #9
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CSuder99,
they seem to last with just lights & fantastic fan.
I'm plugged into a factory 12 volt cigarette lighter style outlet with the small inverter. The digital antenna is the only other thing drawing on the batteries.
The inverter is one from Walmart $30.everready 400watt ,plug in cigarette lighter kind. Modified sine wave.
Twinboat,
shore power is disconnected,only using 1, 12 volt outlet to power the small inverter.
Winterbagoal,
I figured they were adequate but not top of the line, factory has to cut corners to keep price down.
Thanks to all for the replys, miker
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Old 12-31-2019, 09:04 AM   #10
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I used to use 2 Schumacher 400W portable inverters in our 2016 Sunstar 26HE to run the TV, laptops, whatever, when we were off grid. I don't recall what size or make/model house batteries they were, but they seemed to do the job better off grid, than the 2 Napa 8240s in the newer Navion. They handled the inverters plus the other usual 12V DC loads, without fail.
That Sunstar was truly entry level equipped. No fancy solar or inverters in it, just had to MacGiver things to get us some electrical comforts, using whatever we had handy. I used the same inverters in our Roadtrek, for the same reasons. It was easier to use the low wattage 12V cigar lighter plug in inverters. I had 2 big AGMs in the Roadtrek, same results, no problems off grid.
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Old 12-31-2019, 09:16 AM   #11
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Like others, I suspect the batteries are toast. Weak batteries will often power small loads okay but fail with larger loads. As a comparison test, you might run the inverter & TV off your Jeep's battery and see what happens.
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Old 12-31-2019, 09:16 AM   #12
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If your reading the low voltage at the inverter, you have inadequate wiring for that amp draw.

The 12 volt outlet may have a long run to the 12 volt source.
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Old 12-31-2019, 12:43 PM   #13
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Time to test the individual components. I'd disconnect the batteries and test them individually with the battery load tester 4-5 times each in 1 minute intervals.
Also, the tester is basically a voltmeter so you can use it to check the voltage drop when the inverter is in use. The drop should be small with only 90W of load.
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Old 12-31-2019, 01:57 PM   #14
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From Napa: The 8240 is a Dual Purpose Battery For Excellent Starting & Moderate Deep Cycle Service.

Those batteries are primarily for starting with an occasional use with a trolling motor. They're not good for RV service. The 62 AH rating was the giveaway as a true deep cycle group 24 will have about 75 AH. You've probably used up their life by now.
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