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Old 02-21-2011, 09:08 PM   #21
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Quote:
Originally Posted by dan747 View Post
What is the advantage of two 6V batteries? I have seen that mentioned on other threads.

read this:

The 12volt Side of Life (Part 1)
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Old 02-22-2011, 07:32 AM   #22
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The 2000 watt generators like the Yamaha and Honda will run a 13.5K AC if it is the only thing running on AC. I can not do it in economy mode because of the compressor startup draw that exceeds the capability of the throttled down inverter to provide when it needs to. Take it out of economy and all will be fine. If you have a 15K then you will need a 2400 watt generator or larger to handle the startup load. It will also need to run in normal and not economy. My 3000 watt (Plus 500 Boost) needs to be in normal to handle the 15K AC's start up load as well. I can also use all my other 110AC items at the same time though.
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Old 02-24-2011, 06:53 PM   #23
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I put the battery on the RV on Sunday and by Wed it was at 50% running the fridge and parasitic stuff. So 3 days to 50% with one 80a/h AGM. I also ran the lights a little and fired up the heater for about a half hour. maybe 2 batteries will get me 5 days to 50% with real camping and not sitting in my driveway. Just my little non scientific experiment. When I hooked 120 up the batt was fully charged in 4 hrs with the minimum still running.

I think if I'm going to purchase a generator it will be either a 2000w or 3000w. I think 1000 is just not going to cut it. I have a friend selling a 3000w Yamaha quiet gen for $1300 and it only has about 100hrs on it.

Thanks for all the info. I'll keep researching and figure out what I'm going to do. I think trial and error is going to be the best learning experience. So now I need to go camping

Thanks, Paul
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Old 02-24-2011, 08:03 PM   #24
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Paul,

Just curious; how did you determine that the battery was fully recharged in 4 hours? Or that it was 50 percent discharged for that matter.

My 150 ah bank was 81 percent charged when I hooked up to the truck. I drove 5 hours from Key West to Clewiston, FL and when I arrived it was 89 percent recharged. After 24 hours of shore power charging the capacity meter was 99 percent.
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Old 02-24-2011, 08:05 PM   #25
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Lou,

Maybe a 3 stage charger?
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Old 02-24-2011, 08:14 PM   #26
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Scubie,

The reason I asked is that the idiot lights on the monitor panel are as useless for battery monitoring as they are for waste water management.

To use voltage or specific gravity, the battery must be in a static no load condition for a minimum of 12 hours for an accurate indication.

The way the computer monitors work is:

You tell them the starting condition. When you are sure they are 100percent. Usually when they have been on shore power for at least a week. Also you tell the computer the amp hour capacity of your bank.

The computer then sets the starting condition to be "100 percent"

Then all amps into and out of the batteries are counted and a running display of capacity is noted as well as current status (amps in or out).
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Old 02-24-2011, 08:19 PM   #27
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I agree Lou, I guess I don't know as much as you about chargers. But just throwing out a possible way it could of been 4 hours.

I agree rv 12v system is HORRIBLE.
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Old 02-24-2011, 08:24 PM   #28
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That is why I posted to Paul. I did not know.
It is certainly possible to do a full charge with a dedicated battery charger; but I got the impression that might not have been the case.

As to knowing; believe me I too am "drinking from a fire hose" here.

Having the TM-2025 to actually test stuff written about here is a real eye opener. I learned a LOT about the limitations of the house charger right here on the forum.
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Old 02-24-2011, 10:22 PM   #29
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I let it run for 4 hours on the RV unit . then hooked my real charger to the battery. It read fully charged as soon as I hooked it up and has stayed there in float mode. I don't know how accurate this is but it's close enough right now.

Like I said it is purely unscientific and i'm just trying to get a feel for what the system will do.

As I stated before, " I think trial and error is going to be the best learning experience. So now I need to go camping"
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Old 02-25-2011, 07:38 AM   #30
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Paul, I have no doubt you fully charged it in 4 hours. However, if that is the case, I do not think you had discharged it as deeply as you thought. The "Good" "Fair" "Low" lights don't mean very much.

My idiot lights are still on "G" and the TM-2025 shows 88% remaining after watching TV last night for about an hour on the inverter after quiet hours.
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