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Old 02-01-2011, 08:40 PM   #11
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When hooked up in series voltage is doubled, not amps.
When hooked up in parallel, amps are doubled not volts.
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Old 02-01-2011, 08:44 PM   #12
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GRRRRR.... that's hard to swallow
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Old 02-01-2011, 08:47 PM   #13
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Lol. I am on my wife's iPad so I can't attach the PDF, but search the forum for the 12 volt side of life. It will explain it better than I can.
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Old 02-01-2011, 08:52 PM   #14
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Bikendan posted the PDF in the 6 volt questions thread. With this goofy app I have no idea how to link the thread.
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Old 02-01-2011, 08:56 PM   #15
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I kinda started reading that understanding 12 volt batteries. The problem is that 200 Ah is not bad but if you can only drain 50% brings it down to 100 Ah then I would maybe get 8 - 10 hours of use which is still a buch. But not it's to the point do I dare just get a better generator. I need to know how much I am going to use the camper in 2011. No planned trips but do have trips in the works.

Also I have a family so full hookups will probably be the choose but I like sporting events which usually are no hook ups.
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Old 02-02-2011, 08:57 AM   #16
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The "no hookups" situation is what I deal with all the time.

This is what I have learned: (I am sure others will have different opinions - this IS an open forum )

1) If you plan on air conditioning you need a minimum of 3000 watts and the generator not running in economy. You will never be able to air condition on battery. (A Yamaha EF3000 or two Honda Ei2000 in parallel)

2) You need a 1500 or more watt inverter (remote control is a bonus) to watch TV on battery power.

3) No matter how big your generator is, you are limited to the Power Converter's ability to put amps back into the battery. That mount is determined by the battery voltage at the time. If it is very low the "fast charge" stage of the 3 stage center will squirt in about 15-20 amps but as the voltage recovers, the next stage will kick in to keep you from boiling your battery. The amps drop to about 9 amps. Then the final stage kicks in when there is about 10% to go, and it drops to 2 amps. It can take running the generator at idle ALL DAY to charge a very low battery. This is a power converter limit; not the generator.

4) If the battery is very low it is faster to remove it from the camper and use the DC charging port on the side of the generator. It will fast charge the batteries without the limits of the power center. You MUST watch them like a hawk to avoid boiling them dry or exploding them from too much hydrogen being trapped under the vent caps.
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Old 02-02-2011, 08:29 PM   #17
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source for 400 amp hour 6 volt batteries:
Surrette S530 6V 400 AH Wet Battery Wet Batteries | CivicSolar

Note they weigh 117 pounds EACH and you will need two. That will give you 12 volts and 400 amp hours. It could also take 2 days to recharge them running the generator.
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Old 02-02-2011, 08:36 PM   #18
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Lou, you already made me cry about the Ah question, but now that I sit down and think about it ,it makes sense. I am unsure what to do. I thought about getting 3 12v batteries at about 75 Ah a piece. I don't know yet. Or just go the generator route. My ideas have changed.
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Old 02-03-2011, 07:16 AM   #19
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Sorry I made you cry, but I am still wiping tears from when I found out about how dry camping works.

No matter which way you go, you will need a good QUIET generator. That will set you back a grand no lie. The Honda Ei2000s are great for topping off batteries. If you want air, you will need a 2400 (or two 2000s)(for a 13.5K AC) or a 3000 (for a 15K AC).

DO add a second 12 volt 75. It is only about 80 bucks and will double your capacity to 150 AH. That and the cabling is a 125 dollar upgrade.

OR

Dump the cheap a** 12 volt DC battery you have now for two 200AH six volt batteries in series. This will run in the 400 dollar range and only makes sense if you dry camp A LOT. My 150 AH tank seems to handle us ok as long as I can run the generator every day.

DO NOT buy a 500 dollar contractor grade generator. You will get tired of having to repaint your truck from the key strikes. If you stop painting it, they will pop your tires.
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Old 02-03-2011, 07:27 AM   #20
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Sitting in dry camp now and using the data from the TM-2025...

No load: (Propane detector; Inverter on and charging phones; Fridge on Propane) -2.9 amps (Minus means current out of the battery)

Add TV; antenna amp: -13.5 amps

Killed generator last night at 8PM at 100% capacity
Watched 2 hours of TV and read using LED lights.
Battery bank this morining at 84%

I have replaced all lights with LED pads. Every LED in the camper on draws the same power as ONE two bulb incandescent and the camper looks like a circus tent.

Generator is running now to use the microwave. Recharge rate is 11.2 amps. So if you pull 18 amps or so for 3 hours it will take 4 hours of generator to replace that power.
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