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| Topic: Ok to run shore power without battery? |
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Posted By: 144Grayling
on 11/09/23 12:46pm
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I have a 2007 Komfort trailer with a WFCO ultra distribution panel model WF8955an with a 3 stage converter. Lately the fan in the panel has started running for hours at a time. I checked the battery and it is boiling HOT. We don’t travel, the trailer is plugged into shore power 100% of the time. Is there any problem with removing the battery and just having the 12v lights and bath fan run off the converter?
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Posted By: vermilye
on 11/09/23 01:00pm
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I'd check the voltage the converter is producing, particularly if you are going to run it without a battery. I know of at least one case where a WFCO converter failed & produced 21V, destroying a pair of AGM batteries. High voltage can damage your lighting & 12V appliances...
Jon Vermilye My Travel Blog My Photo & RV link blog
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Posted By: Boomerweps
on 11/09/23 01:03pm
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I added a battery disconnect and use that for winter storage but left the TT plugged into shore power so I can still use the lights and radio. Just yesterday I plugged in a portable electric heater and took a nap in there. Need the light’s because I put reflectix in all the windows, retains the heat a little better and makes it much darker in there. My batteries are LiFePO4 so no float voltage isn’t a big deal.
2019 Wolf Pup 16 BHS Limited, axle flipped 2019 F150 4x4 SCrew SB STX 5.0 3.55 factory tow package, 7000#GVWR, 1990 CC Tow mirrors, ITBC, SumoSprings,
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Posted By: valhalla360
on 11/09/23 01:13pm
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Obviously, something is wrong with the battery charger...so best not to use it at all until it can be repaired or replaced.
Tammy & Mike Ford F250 V10 2021 Gray Wolf Gemini Catamaran 34' Full Time spliting time between boat and RV
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Posted By: agwill
on 11/09/23 02:04pm
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sounds like a bad battery to me. out of water?
al |
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Posted By: wa8yxm
on 11/09/23 03:18pm
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I half agree with the person who said something is wrong with the converter. The reason it's only half is there is a "Suspect #2" (or perhaps #1) and that is the battery. Either the converter is putting out high voltage (your lights will be super bright and likely not last long story follows) or the battery MIGHT have one or more cells shorted (your volt meter is your friend.. Resting should be 12.6 Put a small load on it (I like automotive test lights.. Look like an ice pick with a bulb in the handle and a wire with clip lead.> Add 25-50 feet of say 18 or 20 ga wire (with a clip on one end and a ring terminal on the other) and you have a very useful tool.... Test fuses swiftly.. Find broken wires (12 volt side of life only) and more very fast and very easy) If the light goes dim after a few seconds.. Shorted cell (you don't need the extension ground lead for battery testing) Oh the extension lead.. Like I said put a ring terminal on one end or strip back an inch or two twist loop and solder This is so you can clamp the test lights clip on and a clip on the other.. Then Fold in half and re-roll on the spool it came on (or put one end through the center holes and move it to the middle and re-roll. That way you only need to unroll enough when you need it. But use a volt meter even if it's a 10 buck horrible frieight special to measure battery and House voltages with the battery disconnected.... Post results. Home was where I park it. but alas the. 2005 Damon Intruder 377 Alas declared a total loss after a semi "nicked" it. Still have the radios Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times
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Posted By: 144Grayling
on 11/09/23 04:35pm
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Thanks for the input. The battery is at the NAPA shop being tested. I’ll check the converter output when I get to the trailer. Lights aren’t extra bright.
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Posted By: 144Grayling
on 11/09/23 04:40pm
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Also the NAPA guy said that a deep cycle RV battery is not really appropriate for my set up (basically kept at full charge by the smart converter) since it never discharges. Opinions on that?
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Posted By: dougrainer
on 11/09/23 04:57pm
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144Grayling wrote: Also the NAPA guy said that a deep cycle RV battery is not really appropriate for my set up (basically kept at full charge by the smart converter) since it never discharges. Opinions on that? Auto Parts guys are total experts on RV charging systems. NOT! Doug |
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Posted By: 144Grayling
on 11/09/23 06:17pm
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Ok. I just checked the voltage coming off the converter, no battery in place. It is 12.9, which is a bit low, but enough to run the lights. Haven’t heard back from NAPA on the condition of the battery. Unfortunately I left the battery outside not on a charger over a couple of winters, which I figure killed. A stupid expensive mistake. But if I don’t need a battery as long as I’m plugged in, I’d rather not spend a couple hundred bucks. So back to my original question: can I just run on shore power with no battery? Will this harm the converter? Thanks for the help.
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Posted By: ScottG
on 11/09/23 06:32pm
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Disconnect the battery and see if it's still 12.9. I'm thinking possibly your battery is shorted internally and without it, your voltage will rise to normal levels. I too, suggest you don't get your advice from a NAPA counter guy and yes, it's fine to run your particular rig on shore power without a battery. * This post was edited 11/09/23 08:30pm by ScottG * |
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Posted By: Nv Guy
on 11/09/23 08:40pm
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My guess is your battery is internally shorted. I would put a new battery in the coach. The battery acts as a "shock absorber" for the converter, stabilizing the output & giving the converter a stable voltage reference.
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Posted By: 144Grayling
on 11/09/23 09:42pm
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The 12.9 was with the battery disconnected. (In fact the battery was at the NAPA shop miles away??) Looks like one vote for “it’s ok to run without a battery” and one vote for “you should put in a battery” Anyone else wanna break the tie? And if I really do need a battery to protect the system should it be a deep cycle RV battery or a plain old car battery, knowing it will never be without shore power. |
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Posted By: ktmrfs
on 11/09/23 09:51pm
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144Grayling wrote: The 12.9 was with the battery disconnected. (In fact the battery was at the NAPA shop miles away??) Looks like one vote for “it’s ok to run without a battery” and one vote for “you should put in a battery” Anyone else wanna break the tie? And if I really do need a battery to protect the system should it be a deep cycle RV battery or a plain old car battery, knowing it will never be without shore power. high quality working converter likely no problem running w/o battery. low quality converter or not regulating voltage no battery likely issue. The battery acts like a 12V load and filter. my opinion, just install a 12 marine or car battery since you run with shore power. will give protection for other more valuable stuff in the trailer, fridge, wh, furnace, lights etc. 2011 Keystone Outback 295RE 2004 14' bikehauler with full living quarters 2015.5 Denali 4x4 CC/SB Duramax/Allison 2004.5 Silverado 4x4 CC/SB Duramax/Allison passed on to our Son!
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Posted By: ScottG
on 11/09/23 10:38pm
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Nv Guy wrote: My guess is your battery is internally shorted. I would put a new battery in the coach. The battery acts as a "shock absorber" for the converter, stabilizing the output & giving the converter a stable voltage reference. They haven't been built like that since the old Magtek 63XX days, prior to somewhere around 2000. Anything (even a WFCO) will have no problem making clean DC without a battery. |
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Posted By: valhalla360
on 11/10/23 12:45am
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144Grayling wrote: Also the NAPA guy said that a deep cycle RV battery is not really appropriate for my set up (basically kept at full charge by the smart converter) since it never discharges. Opinions on that? Lead acid batteries are happiest at 100% charge. All types of lead acid. But if the charger keeps charging after full, it will boil off the water causing damage. Lithium are not happy staying for long periods at 100%. Better for storage at 20 to 80%. Unless you are running 6v batteries, 99% chance the internals of your battery are a starting battery just with a different label slapped on. |
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Posted By: pbeverly
on 11/10/23 05:10am
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With my TT if I do not have a good battery while hooked up to shore power 12v things are not 100%. Last week went on trip, night before we left my slide-out came in no problem. Camper stayed plugged in overnight before trip. Got to a destination and hitchjack had trouble getting hitch off of truck, but it managed. Went to put slide-out out. Moved maybe two inches. Plugged into shore, still nothing. Went to Walmart, sadly, and got a new battery. Slide-out worked fine now that a new battery was in place.
Ridgeway, SC |
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Posted By: JoeH
on 11/10/23 05:55am
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Why not just get a battery-- you didn't state size-- but something like a Group 24 that will run under $150 and install it. In the event of power outage, you will still have lights and if, by chance, your converter needs a battery, it will be happy too.
Joe 2013 Dutch Star 4338- all electric Toad is 2015 F-150 with bikes,kayaks and Harley aboard |
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Posted By: BruceMc
on 11/10/23 09:28am
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The more experienced amongst us might poo-poo this idea, but for your situation, perhaps a small sealed lead-acid (SLA) battery could act as that buffer. Small SLAs are used for telecommunication & security equipment, and are readily available at your local stores for around $20-$30. Search for "12V 7.2AH Sealed Lead Acid (SLA) rechargeable maintenance free battery". '16 Forest River Sunseeker 2250SLEC Chevrolet 6.0L Previously: '00 Four Winds 26Q Class C (Ford E350 V10) '96 Kit Sportsmaster 212f Fifth Wheel/'93 GMC Sierra K2500 '91 SunLite poptop truck camper and the first: a Wildernest flip-top canopy. |
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Posted By: 144Grayling
on 11/10/23 10:01am
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Thanks for all the information. The battery is a 12 volt lead acid RV deep cycle battery from Les Schwab. No reason to think it’s not what it says it is. As far as I know the only 12v functions in the trailer are lights, bathroom exhaust fan, radio and propane alarm. All those are fine on what’s coming out of the converter now: 12.9v No slide out, no hitch jack. Checking the panel it also has a few other 12v circuits that we don’t use ( dont need the water pump since we’re hooked up permanently, and the furnace, since we use electric heat instead of propane.) And it says the hood fan is 12v which I didn’t know. So everything we need is working fine off the converter and shore power. I don’t know why the converter was overcharging the battery to the point of boiling, but if it can go without a battery I really don’t need to care about it. I suspect that I killed the battery by leaving it outside uncharged over a couple of winters and that’s my bad. But, again, if I don’t need a battery in the system I’m ok. Still getting mixed opinions on that.
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Posted By: pianotuna
on 11/10/23 10:01am
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Best practice is to have a battery.
Regards, Don My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start. |
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Posted By: ScottG
on 11/10/23 11:56am
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If your RV is sitting on a seasonal lot and never moves, you're fine without a battery. Having one will not change or improve anything. If you're towing or have slides that have to be moved in and out, you may need the battery for extra capacity but you don't need it to make the converter create clean power - at least not a converter from 2007.
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Posted By: 144Grayling
on 11/10/23 02:33pm
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No surprise the battery is no good. Wouldn’t hold a charge. Still unknown whether a bad controller overcharged it and killed it or I killed it by leaving it uncharged all winter and the controller just boiled it trying to charge it. For right now I’ll be running on shore power with no battery. Just for the next few days then shut the whole thing down for winter. Saw no point in buying a battery at this point. Thanks again for all the help.
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Posted By: ken56
on 11/10/23 04:30pm
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Lead acid wet batteries get sulfated when left uncharged. The sulfur in the acid sticks to the lead plates and hardens on the plates if not knocked back off by charging...so yes, you killed the battery by leaving it in an uncharged state.
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Posted By: ktmrfs
on 11/10/23 05:21pm
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144Grayling wrote: Thanks for all the information. The battery is a 12 volt lead acid RV deep cycle battery from Les Schwab. No reason to think it’s not what it says it is. As far as I know the only 12v functions in the trailer are lights, bathroom exhaust fan, radio and propane alarm. All those are fine on what’s coming out of the converter now: 12.9v No slide out, no hitch jack. Checking the panel it also has a few other 12v circuits that we don’t use ( dont need the water pump since we’re hooked up permanently, and the furnace, since we use electric heat instead of propane.) And it says the hood fan is 12v which I didn’t know. So everything we need is working fine off the converter and shore power. I don’t know why the converter was overcharging the battery to the point of boiling, but if it can go without a battery I really don’t need to care about it. I suspect that I killed the battery by leaving it outside uncharged over a couple of winters and that’s my bad. But, again, if I don’t need a battery in the system I’m ok. Still getting mixed opinions on that. 12V is needed for a propane/electric fridge (even on shore power) water heater (even on electric) usually for propane and sometimes CO detector |
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Posted By: ScottG
on 11/10/23 10:36pm
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144Grayling wrote: Thanks for all the information. The battery is a 12 volt lead acid RV deep cycle battery from Les Schwab. No reason to think it’s not what it says it is. As far as I know the only 12v functions in the trailer are lights, bathroom exhaust fan, radio and propane alarm. All those are fine on what’s coming out of the converter now: 12.9v No slide out, no hitch jack. Checking the panel it also has a few other 12v circuits that we don’t use ( dont need the water pump since we’re hooked up permanently, and the furnace, since we use electric heat instead of propane.) And it says the hood fan is 12v which I didn’t know. So everything we need is working fine off the converter and shore power. I don’t know why the converter was overcharging the battery to the point of boiling, but if it can go without a battery I really don’t need to care about it. I suspect that I killed the battery by leaving it outside uncharged over a couple of winters and that’s my bad. But, again, if I don’t need a battery in the system I’m ok. Still getting mixed opinions on that. With that information, you don't need a battery. Your WFCO converter will take care of everything you describe. |
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Posted By: wa8yxm
on 11/11/23 04:29am
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ScottG wrote: but you don't need it to make the converter create clean power - at least not a converter from 2007. Good that you added "From 2007" as some of the older (Magnetek) you did need a battery or what they called a "Battery simulator" (Hardening capacitor is another name for it.. ONE HIGH CAPACITY Condenser like a farad or two) to clean things up. |
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Posted By: StirCrazy
on 11/11/23 06:26am
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144Grayling wrote: The 12.9 was with the battery disconnected. (In fact the battery was at the NAPA shop miles away??) Looks like one vote for “it’s ok to run without a battery” and one vote for “you should put in a battery” Anyone else wanna break the tie? And if I really do need a battery to protect the system should it be a deep cycle RV battery or a plain old car battery, knowing it will never be without shore power. looks like your converter is fried. should be 13.6 to 13.7 with no battery hooked up. so, you likely need a new converter and a new battery 2014 F350 6.7 Platinum 2016 Cougar 330RBK 1991 Slumberqueen WS100 |
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Posted By: 144Grayling
on 11/11/23 08:51am
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That may very well be true. But for now it serves our needs. This trailer is parked on our property to stay in during visits while we work on a permanent house here on the island. It’s a “bridge strategy” ( altho that bridge has gotten longer than hoped.) So as long as everything is working on 12.9 v (and it is) the motivation to put more money into it is pretty much zero. When we are done with it we’ll probably just give it away and the new owners can decide what to do.
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Posted By: pianotuna
on 11/11/23 09:16am
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Get a tiny cheap battery. For example: https://www.costco.com/interstate-u1-law........26-garden-battery.product.100476412.html |
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Posted By: wa8yxm
on 11/11/23 04:36pm
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StirCrazy wrote: looks like your converter is fried. should be 13.6 to 13.7 with no battery hooked up. so, you likely need a new converter and a new battery I'd need to haul some serious test gear into his rig to make an "Diagnosis" but. 13.6 volts DC is not the same as 13.6 RMS. The old Magnetek 6300 Well if you read on the older analog volt meters the DC out was like 12-12.6 but if you read on the type of hardware I have you saw 18 volts (Depending on the device. I have both kinds) so his 12 volts... might just be poor filtering of a supply with lots of ripple. Or it may be a very smart converter that says "Well I do not sense a battery so I'll go with the lower voltage" Some I'm told do that. never seen one but that's not the business i'm in. But if you are planning on running w/o battery by all means. If it's a trailer you need to tow.. Use a battery tender on the disconnected battery. re-connect to tow Or upgrade converter to a Progressive Dynamics 9200 series. (or 4600 if it's part of the power distribuition assembly). |
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Posted By: Boon Docker
on 11/11/23 05:59pm
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His 12.9v reading from the converter (with no battery) is 14.32v RMS.
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Posted By: ktmrfs
on 11/11/23 06:57pm
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Boon Docker wrote: His 12.9v reading from the converter (with no battery) is 14.32v RMS. how do you know that? If the converter is putting out 12.9V DC with little or no ripple the RMS voltage is 12.9V Unless you LOOK at the output waveform and KNOW what kind of meter is used you don't know what the RMS value is. |
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Posted By: 144Grayling
on 11/11/23 09:27pm
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According to the operators manual the power converter has 3 modes: bulk, absorption and float. If the output voltage of the battery drops to 13.2 it goes into bulk mode and puts out 14.4 VDC. When the battery reaches 14.4 or after 4 hours, (whichever comes first) it reverts to absorption mode (13.6 VDC). After detecting no load for 48 hrs the converter goes into float mode (13.2). Notice that none of the modes put out 12.9, so yes it’s probably defective. But as I said above, everything I need 12 volts for is working fine so I’m just going to live with it. I never timed how long I heard the cooling fan running (which I guess was bulk mode) but it seemed like more than 4 hrs. However long it ran, it boiled the battery. Maybe because the battery never got to 14.4 and the converter kept trying, possibly longer than it should have. There is a caution in the manual that if it cycles into bulk mode more than once during a charge cycle to check for a bad battery. I wasn’t paying good attention and should have done that. And timed the bulk mode. And of course I shouldn’t have left the battery outside uncharged for 2 winters. So I lost all kinds of points on this one. As long as it’s not going to drive the converter crazy with zero volts battery discharge and damage it to the point it doesn't put out 12 volts, I can live with it. And as long as it’s not going to burn the trailer down trying to charge an air gap. |
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Posted By: StirCrazy
on 11/12/23 08:57am
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wa8yxm wrote: I'd need to haul some serious test gear into his rig to make an "Diagnosis" but. so his 12 volts... might just be poor filtering of a supply with lots of ripple. Or it may be a very smart converter that says "Well I do not sense a battery so I'll go with the lower voltage" not really a simple multimeter would do, if you really wanted to see a wavelength a simple oscilloscope will work. He told us the model number and that's what that converter is supposed to put out as an output, from the manufacture, with no battery. We are not talking generics here but rather an actual test procedure from the manufacturer for that model. but why the heck are we talking about RMS here, that is to get the average power from an ac power form and compare it to a DC voltage, there is no DC RMS, we do get DC ripple that is introduced from components and old unfiltered systems when they are plugged in or failing but that usually presents as a higher or lower overall voltage, and same thing you need a oscilloscope to see the ripple, so a manufacture isn't going to use that as a simple test the consumer can do as while you don't need an expensive one not many people have purchased a oscilloscope for their home tool box. |
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Posted By: Boon Docker
on 11/12/23 10:30am
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ktmrfs wrote: Boon Docker wrote: His 12.9v reading from the converter (with no battery) is 14.32v RMS. how do you know that? If the converter is putting out 12.9V DC with little or no ripple the RMS voltage is 12.9V Unless you LOOK at the output waveform and KNOW what kind of meter is used you don't know what the RMS value is. Epistemology
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Posted By: 144Grayling
on 11/12/23 10:40am
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Ok. I checked the converter output this morning and it’s 13.2 VDC So it’s in float mode.
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Posted By: ScottG
on 11/12/23 10:45am
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144Grayling wrote: Ok. I checked the converter output this morning and it’s 13.2 VDC So it’s in float mode. Perfect. |
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Posted By: StirCrazy
on 11/12/23 06:26pm
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144Grayling wrote: Ok. I checked the converter output this morning and it’s 13.2 VDC So it’s in float mode. with a battery or without. if without it still isn't right and it won't go into any "Mode" without a battery connected as it is the state of charge of the battery that determines the load, or time at that state of charge. If this is with a battery you could be good. without. still doesn't meet specs. |
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Posted By: time2roll
on 11/12/23 08:50pm
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WFCO does not require a battery.
2001 F150 SuperCrew 2006 Keystone Springdale 249FWBHLS 675w Solar pictures back up |
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Posted By: opnspaces
on 11/13/23 09:14am
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as you say if it's putting out 12v and everything works then I would just run it as it is with no battery. I am curious though. What ever happened to Napa testing the battery? Did they say it failed the test or is it still good? 2001 Suburban 4x4. 6.0L, 4.10 3/4 ton 2005 Jayco Jay Flight 27BH 1986 Coleman Columbia Popup. |
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Posted By: pianotuna
on 11/13/23 12:53pm
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Does the RV have slides?
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