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 > Your search for posts made by 'pianotuna' found 2376 matches.

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RE: acceptance charging rate AGM batteries

Hi Mex, My real life is 160 amps of draw for 2 minutes and 22 seconds. Battery voltage remains at 12.1. The bank was not at 100% for this test. An exercise BCI load test of a 800 CCA starting battery 50% of rated BCI CCA amps is the formula = 400 amps. A 400 ampere load is imposed. For 15-seconds Voltage at the end of 15 seconds of load must not have drooped to less than 9.6 volts (temp comp). While this example is not a real-life example of RV battery discharging it should show the relationship of how a battery reacts to a load. 9.6 volts is far too severe a load for usage (it's only for testing the battery). My personal choice for discharge maximum is 20% of total amp hour rating, and that is for limited time loads like heating coffee in a microwave.
pianotuna 08/29/16 06:35pm Tech Issues
RE: acceptance charging rate AGM batteries

Hi Naio, They used to weld by shorting out batteries. It was not so good for the batteries. Plates warp if you exceed their output capacity and it sure doesn't take long (as you found out the hard way). Basically, you may have inadvertently "welded" the inside of the battery. When I damaged a battery by pulling 2c from it for a second, I don't think it was because I drained the battery.
pianotuna 08/29/16 05:47pm Tech Issues
RE: Absorbed Glass Mat Battery Management Nuggets

Hi, You might do well to read all Mex has to say. For example fj12ryder misinterpreted what Mex said--and you are compounding that error. Talk about jumping on a band wagon. Just skip the hyperbole and post your views. I'm relatively new to the rv.net forums but early on I learned that MEX and "hyperbole" are one and the same. :W As a result I find I'm forced to just skip most of his posts, occasionally quickly scanning a few, but mostly just passing as the "hyperbole" is just too tiring to forge through. Too bad, as I'm sure there's some great content in there somewhere ... I just don't have the energy to suffer through all the rhetoric to find it. :(
pianotuna 08/29/16 05:03pm Tech Issues
RE: Absorbed Glass Mat Battery Management Nuggets

Hi, Read more carefully. Mex is RECOMMENDING agm for automotive use. I never knew there was anybody recommending not to use AGM batteries for automotive applications. I've been using them on my bikes for 10-15 years. That's what has been specified from when they were new. "Remember, rumor, unfounded opinions, and hyperbole rule the internet and especially chat forums." And you're posting this whole article on a forum, and we're supposed to believe that you are the one person we can believe. I'm sure that the person who posts a contrary view to yours will post the same warning. And he'll, of course, post that he is an electrical engineer with 20 years experience. Just skip the hyperbole and post your views.
pianotuna 08/29/16 04:59pm Tech Issues
RE: acceptance charging rate AGM batteries

Naio, It makes a large difference to the total available capacity. Low watts for double the time may use 1/3 less energy--depending on the battery bank capacity.
pianotuna 08/29/16 01:52pm Tech Issues
transformer watt meter for 120 volts ac

Hi, At this price, I may just buy one for fun!! 122067500974 on ebay transformer meter.
pianotuna 08/29/16 01:01pm Tech Issues
RE: acceptance charging rate AGM batteries

Hi Naio, Peukert says lower wattage is always better than higher wattage, given the same efficiency in the devices being powered. Folks in stores think I'm nutty as a fruit cake as I test their devices with my kill-a-watt meter to see which brand is lower wattage.
pianotuna 08/29/16 12:42pm Tech Issues
RE: acceptance charging rate AGM batteries

Hi Naio, Yes, I do run the microwave from the inverter/battery bank. But it represents a load of 160 amps and I have four twelve volt jars. So the load per cell is 40 amps. From a capacity point of view I have 556 amp-hours. So I'm loading at 28% of capacity when I use the microwave. Or c/3.5. Run times tend to be short. For example, lunch today was a left over boneless pork chop sandwich heated in the microwave for 44 seconds (actually two 22 second runs). Two nights ago I had popcorn. Run time of 2 minutes and 22 seconds. My biggest use, so far, was in June when I was being a "power pole princess" at an inadequately wired campground (is there any other kind?) I was forcing the Magnum into doing not just load support but voltage support. That meant drawing 64 amps from the battery bank for several hours. The numbers say 16 amps per cell. Or C/8.8. I should never have to do voltage support now that I have the autoformer, and it will be automatic. The worst load is the 1591 watt microwave.Do you actually use that on the batteries?
pianotuna 08/29/16 12:26pm Tech Issues
RE: acceptance charging rate AGM batteries

Naio, That's battricide. The most I can do theoretically is about 300 amps from a 556 amp-hour bank. I have seen 276 but more usually am under the 200 mark. In an ideal world for 200 amps draw I'd have 800 amp-hours of battery bank (which is where I started out with flooded jars). Best use case for my bank would be to not exceed 139 amps, but that would mean I'd have to not cook my bacon and eggs while running the toaster. I do try to sequence the loads. The worst load is the 1591 watt microwave.
pianotuna 08/29/16 10:32am Tech Issues
RE: acceptance charging rate AGM batteries

Hi Niner, How do you know they don't like high discharge rates? i.e. what are the symptoms you are seeing to make you believe that? They also do NOT like being taxed with high discharge rates, either. I try to keep the draw down to nothing more than 10 amps... try to take my showers in the morning when the sun is beating on the solar panel and the voltage is up a bit, let the solar panel make the electricity to run the water pump at a higher voltage and lower amperage draw. I have a ham radio that at 100w will draw at 23 amps. The Telecom battery does NOT like that, so I usually limit my watts to 75 or 80w Tx. Listening Rx is a whole another matter, 2 to 3 amps listening or idling. These are my observations, YMMV this is what works for me on 2 to 4 week camping trips dry camping.
pianotuna 08/29/16 12:17am Tech Issues
RE: No Maintenance Coach Barttery

Hi, Agm's are not all the same. Lifeline wants a BIG FAT charging amperage. Others may not want more than c/5 (mine). Some folks have had good luck with a 13.6 volt charge rate with Universal Batteries So the real answer is find a battery that mates well to your existing converter or find out how to set up an inverter/charger to the parameters the particular AGM needs.
pianotuna 08/28/16 09:02pm Tech Issues
a little surpize from the good folks at Magnum

Hi all, A little surprize thanks to the good folks at Magnum. It turns out that the Magnum is some what sensitive as to input voltage. My Yamaha 3000 sIEB cranks out 122 volts under low loads. With the Fridge that dropped to 121.x. The surpize is that the charging rate on the Magnum goes DOWN as the input voltage goes UP. This happens in load support mode and also when it is in "regular" pass through mode. When I turned on the George Foreman grill I wanted to see what would happen. Well, something sure did. Charging amps jumped from a measly 12 amps up to 40. Talk about a conundrum, LOL. I spend 16 years trying to solve low voltage. I finally have it "beat" with the autoformer. Now I have--too much voltage to do fast heavy duty charging--at least when the batteries are not horribly low.
pianotuna 08/28/16 08:51pm Tech Issues
RE: acceptance charging rate AGM batteries

Well, well, well, A little surprize thanks to the good folks at Magnum. I was crowing about how well the solar system had topped off the battery bank. It turns out that the Magnum is some what sensitive as to input voltage. My Yamaha cranks out 122 volts under low loads. With the Fridge that dropped to 121.x. Sooooooo, the charging rate on the Magnum goes DOWN as the input voltage goes UP. This happens in load support mode and also when it is in "regular" pass through mode. When I turned on the George Foreman grill I wanted to see what would happen. Well, something sure did. Charging amps jumped from a measly 12 amps up to 40. Talk about a conundrum, LOL. I spend 16 years trying to solve low voltage. I finally have it "beat" with the autoformer. Now I have--too much voltage to do fast heavy duty charging--at least when the batteries are not horribly low.
pianotuna 08/28/16 08:10pm Tech Issues
RE: Limiting large vehicles to 68 MPH

Hi, I'd go all way back to the double nickle.
pianotuna 08/28/16 06:05pm Class A Motorhomes
RE: 50 amp to 30 amp

hohenwald48, I find low voltage to be endemic in the summer time if it is hot enough to wish to run the roof air conditioner.
pianotuna 08/28/16 05:55pm Travel Trailers
RE: acceptance charging rate AGM batteries

Hi MrWizard, Thanks for sharing your results. About 2 p.m. the sun broke through the clouds. I was not at the RV to see the charging numbers, but I am pretty sure they were significant. load was 2.83 amps during the day. (Fantastic fan and fridge valve). 5:20 p.m. Solar showing 13.5 volts and 3.5 amps. Started generator because RV was too hot for my tastes. Charging at between 4 and 6 amps. Really I can't complain about the solar system I have. I really expected to see 20 to 30 amps of charging. I'll be running the generator again for supper time. Tomorrow I won't run the generator for breakfast and I'll post the results.
pianotuna 08/28/16 05:48pm Tech Issues
RE: acceptance charging rate AGM batteries

load of 3.2 amps throughout testing. voltage with no solar 12.5/12.6 volts start generator to cook breakfast charging rate 69 amps after 5 minutes 60 amps plus 1 amp from solar after 15 minutes 48 amps plus 1 amp from solar voltage 13.2 just after run voltage 12.8 one hour later with 1 amp from solar (totally overcast gray day) voltage 12.8 after 2 hours with 3.2 amps from solar Started engine 16 amps @ 13.7 volts from the alternator circuits.
pianotuna 08/28/16 10:48am Tech Issues
RE: 50 amp to 30 amp

No problem using a 30 to 50 adapter. You may be better served by an autoformer than by just a surge device.
pianotuna 08/28/16 10:16am Travel Trailers
RE: Mobile hot spots

That is outrageous. $50 per gig is slimy.
pianotuna 08/28/16 09:38am RVing in Canada and Alaska
RE: Travel with fridge on

Hi, The heat source does not matter. Permanent irreversible damage can happen in 15 minutes. Please correct me if I'm wrong here. I thought the out of level refrig damage issue only applied when on propane. The flame when burning "off center" can do damage to the unit. So if that is correct, and if you have generator capabilities, just run the refrig on 120v while stopped and significantly off level. The electric coil heater does not need level. Is that correct? ------ Of course many people dont have generator capabilities.
pianotuna 08/28/16 09:19am General RVing Issues
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