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Old 09-28-2015, 05:21 PM   #11
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styrski

I see that you have a Toyota Tacoma. On my Tacoma there is a plug in source, in the truck bed, by the passenger side of the tail gate. I plug an extension cord into that outlet and charge my trailer's two 12V batteries by plugging the other end into the trailers power cord.
I found it to be quieter than any gererater on the camp site.
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Old 09-28-2015, 05:27 PM   #12
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It looks like both the honda 1000 and the 2000 can put 8 amps out of the DC charging plug.
That would be the fastest way to charge/top up your batteries.

And I would try a simple set of booster cables off of your tow vehicle. Reason being that the tow vehicle can usually output even more amperage when it is running. Some tow packages have 45 amp alternators.

My handy dandy solar calculator tells me that a 150 watt panel installed flat can only generate 44amp hours per day at this time of the year in Aspen
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Old 09-28-2015, 07:48 PM   #13
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Originally Posted by jxoco View Post
It looks like both the honda 1000 and the 2000 can put 8 amps out of the DC charging plug.
That would be the fastest way to charge/top up your batteries.

And I would try a simple set of booster cables off of your tow vehicle. Reason being that the tow vehicle can usually output even more amperage when it is running. Some tow packages have 45 amp alternators.

My handy dandy solar calculator tells me that a 150 watt panel installed flat can only generate 44amp hours per day at this time of the year in Aspen
In general, you will get more charging current with most 120V battery chargers connected to even a 1000 watt generator than the 8 amps, 12V connection on the Honda inverter generator. Even many converters will do better, although the WFCO used by Escape is an exception.

As to alternators, my RAV4 with tow package has a 150 amp one...
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Old 09-29-2015, 11:00 AM   #14
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Originally Posted by J Mac View Post
On my Tacoma there is a plug in source, in the truck bed, by the passenger side of the tail gate.
That's an option that I do not have on my truck. If I did, it would be 400w

Quote:
Originally Posted by jxoco View Post
It looks like both the honda 1000 and the 2000 can put 8 amps out of the DC charging plug.
That would be the fastest way to charge/top up your batteries.

And I would try a simple set of booster cables off of your tow vehicle. Reason being that the tow vehicle can usually output even more amperage when it is running. Some tow packages have 45 amp alternators.

My handy dandy solar calculator tells me that a 150 watt panel installed flat can only generate 44amp hours per day at this time of the year in Aspen
Ya, I knew solar wouldn't cut it for this trip and brought along a generator. My Tacoma has the towing package and a 170something watt alternator, though it only puts out 12.6v through the 7 pin plug. I'm going to to buy a 1000w generator and try the 12v connection. I can always buy a 120v battery charger to go with it, if necessary.

I'm really not unhappy with anything. I've got my wife camping and hiking (some) on Oxygen. By using 2 machines, both capable of 12v, we are doing so fairly safely. I'm just trying to fine tune some things while I have an income.
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Old 09-29-2015, 01:44 PM   #15
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That's an option that I do not have on my truck. If I did, it would be 400w

Ya, I knew solar wouldn't cut it for this trip and brought along a generator. My Tacoma has the towing package and a 170something watt alternator, though it only puts out 12.6v through the 7 pin plug. .
Someone would have to enlighten me on how a 400W inverter could drive a battery charger to more than 3.5amps. Doesn't matter I don't have the inverter anyways.

12.6v is still over 80% charge. Solar can then add to it.

Quote:
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I'm just trying to fine tune some things while I have an income.
Amen, I'm with you on that one brother...
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Old 09-29-2015, 02:56 PM   #16
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Originally Posted by jxoco View Post
Someone would have to enlighten me on how a 400W inverter could drive a battery charger to more than 3.5amps. Doesn't matter I don't have the inverter anyways.

12.6v is still over 80% charge. Solar can then add to it.



Amen, I'm with you on that one brother...
400 watts at 120V = 3.3 amps, but you are charging at around 14v or so. Watts is a measurement of power; the same at either voltage, so If the charger was 100% efficient, it would be capable of providing 28.5 amps. It isn't, but it will produce more than 3.3...

This is why a 1000 watt generator is plenty if all you want to do is recharge your batteries. While finding a charger capable of using the full 1000 watts is pricey, and your battery(ies), depending on size & type might not support a 75 amp charge rate, that is what a 1000 watts is capable of supplying at 14 volts.
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Old 09-30-2015, 09:37 AM   #17
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Plugged oxygen concentrator into Kill a watt plugged into wall AC last night. Display results this morning, 10 hours later:
  • 3 KWH
  • 124.5 volts
  • fluctuating 2.60 to 2.89 amps output
  • power factor fluctuating from .79 to .86
Is this right? 1000 x 3 = 3,000/124.5 = 24.09 amps
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Old 09-30-2015, 10:05 AM   #18
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Plugged oxygen concentrator into Kill a watt plugged into wall AC last night. Display results this morning, 10 hours later:
  • 3 KWH
  • 124.5 volts
  • fluctuating 260 to 2.89 amps output
  • power factor fluctuating from .79 to .86
Is this right? 1000 x 3 = 3,000/124.5 = 24.09 amps

it is just the kwh divided by the hours to get the watts
3000 / 10 = 300
and the volts times amps comes up with the same answer
average amps 2.7 * 124 volts is 334 watts
so it must spend more time around 2.6 amps then 2.89.
mathmatically 300 watts / 124 volts = 2.4 amps

These are all with a 124 ac supply and that would probably be a 12v 400watt inverter running all night. So what would the inverter be sucking out of the 12v batteries?

I wonder what the 12volt units are using?
in real life...

The formula that I've seen thrown around is that inverters are 85% efficient and so
300 watts / .85 = 353
and
353 watts / 12volts = 29.4 amps
That would be per hour so the full ten hours would drain 294 amps from the batteries.
More than the capacity of the dual 6v system of 220 amps.
( the other formula that i've seen is
300watts / 12v * 1.1 = 27.5amp
its adding only %10 for inverter losses. )

But I really don't know if a modern day inverter uses what the 'common' formula says.

I'd like to have a trimetric meter installed so that I could measure the same as the Kill-a-Watt but on 12v dc systems.
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Old 09-30-2015, 10:39 AM   #19
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Actually the capacity of the dual 6er's is closer to 1/2 of that total or 110 amps before any damage can occur to the system.
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Old 09-30-2015, 11:12 AM   #20
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While it doesn't improve the picture, a simpler way to do the calculation is to use the Kill-O-Watt's 3KWH for the 10 hour period & use 12V rather than 120 to get a rough idea of battery needs. 3000 / 12 = 250 amp hours. This does not include efficiencies, etc but does point out that with that specific oxygen concentrator even a pair of 6 volt batteries is not going to cut it...
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