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Old 04-18-2014, 01:34 PM   #15
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The Moderators have been gracious enough to life my restriction on posting link to videos and such. You guys looking at external power should check out this video. I don't work for Champion or anything but I went back and forth for a long time with regards which one to buy and decided on this one! I love it and if your in the market watch this video.
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Old 04-18-2014, 07:26 PM   #16
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"Others have noted this automatic sync function of the inverters and there is one You Tube Video where a guy hooked up his sine wave inverter to a battery, and then to his Honda, and the inverter in the Honda adjusted itself to follow the battery inverter. So, he was able to get more power from the two together and then start an AC unit."

Thank you idroba. I have a friend who is a Silicon Valley power supply specialist. He may know some more about this. If true, it is exactly the answer I am looking for. I think I will search a bit on You Tube as well,

Andrew
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Old 04-18-2014, 07:38 PM   #17
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I would think the best solution would be to have an inverter type generator combined with a big internal battery. The problem with this is that it would be as heavy as 2 generators or one big one. There is no free lunch.

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Old 04-18-2014, 10:47 PM   #18
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Found the you tube video:

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Old 04-18-2014, 10:49 PM   #19
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You can find the You Tube Video by putting this isn the search bar:

"Paralell Honda generators with any inverter pure sine wave testing"


Andrew
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Old 04-18-2014, 11:25 PM   #20
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Although the You Tube video shows TimCat100 manages to get his Honda EU2000 to synchronize and supply power in parallel with his Xantrax inverter, other forums are casting a lot of doubt on the stability of this setup. It seems you can easily sychronize two or even three Hondas, but trying to sync them to inverters may not work reliably.

I am back to looking for a good stand alone charger to run off the Honda.

Andrew
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Old 04-18-2014, 11:58 PM   #21
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I am back to looking for a good stand alone charger to run off the Honda.

Andrew
How will you use a stand alone charger?
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Old 04-19-2014, 10:54 AM   #22
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The Honda would be connected only to the charger, not the house wiring. The Charger would be supplying current to the batteries as the batteries were supplying current through inverter to power A/C. The charger would in effect be running as a converter in parallel with the batteries when the inverter was drawing more than the charger output. The charger is self protected about how much current it will deliver.

Some inefficiency no doubt, but the Honda and charger should be able to offset some of the drain down on the batteries while the A/C runs and then charge them back up when it is off. I think the Honda and charger might even make a net gain during the off cycle of the A/C compressor even if the circulation fan is running.

Since I need the inverter and batteries anyway, the trade off would be a lighter and cheaper discretely tucked away charger instead of a heavier and bulkier second generator or worse yet one that I could not lift at all. I do not see myself using the A/C very often when not plugged in, but thought it might be nice to have the occasional ability to do so without extra weight.

Andrew
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Old 04-19-2014, 11:24 AM   #23
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I think I finally understand what you are proposing. Sorry but it is an impractical idea. The inverter you would need to run the AC unit would be a very large (both physically and electrically) and expensive one necessary to start and run the unit. The cost of that alone would be $2000 +. You cannot start and run the AC on an inexpensive modified sine wave 2000 watt inverter costing a few hundred dollars.

The current draw at 12 volts from the inverter would be in the range of 150 amps and the battery bank which could sustain that for any length of time would not be one which you can really carry in your trailer. Even 4 golf cart type batteries would strain to deliver that kind of a load for any significant period say half an hour to an hour.

The stand alone recharge system you would like to have run from the generator would also have to be equally huge and expensive. We are not talking about a 20 amp charger from Auto Zone here. Even the largest converter/chargers don't generally come in anything other than 80 amp models and you need twice that capacity. This is not a charger which would be "discretely hidden away".

Now, there are some very large stand alone inverter chargers (probably Magnum, and some other brands) which have both an inverter and a charger built in and some will do both functions at the same time. Cost however is going to be in that same range of $2000 to $3000 for the unit alone. Locating it (they are not small) near the batteries and the batteries themselves are still going to be a problem.

Yes, it can probably be done, but the cost far exceeds the cost of a dual Honda 2000 setup, or a Yamaha 2400 (which some say will run the AC ok) or even a Honda 3000. The weight of your proposed system would be more, the maintenance will be more.
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Old 04-19-2014, 11:58 AM   #24
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I have a 5,000 watt inverter that I purchased for less than $500, it will run my a/c for about 25 or 30 min before depleting my two 100 amp hour batteries to 10.5 volts.
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Old 04-19-2014, 12:25 PM   #25
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To me the battery charger is the weak point in the proposed solution.

The small chargers throw higher voltage in "start mode", and are not designed for long term use at these levels.

It takes not long at all to boil batteries at full charge with these.
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Old 04-19-2014, 12:42 PM   #26
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I have a 5,000 watt inverter that I purchased for less than $500, it will run my a/c for about 25 or 30 min before depleting my two 100 amp hour batteries to 10.5 volts.
Probably not the best thing to do to a battery. Going lower then 50% (12.0 volts) will reduce the life of the battery.
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Old 04-19-2014, 02:22 PM   #27
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the inverter store has a 100 amp, 12 volt charger for $369. I have no idea how "smart" this charger is. They have lower amperage for less. They have a 3000 watt combined charger-inverter for $600. they have a 5000 watt inverter for $700. all are modified sine wave inverters which should be okay for AC. They have used inverters for a lot less if someone is feeling experimental.

I enjoyed looking just because I do not have a inverterr. I think I am going to get a 150 watt as a backup for my CPAP machine.
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Old 04-19-2014, 09:20 PM   #28
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I guess I am just a rebel that way....



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