GlennWest Posted November 21, 2019 Report Share Posted November 21, 2019 Looking at Chinese units on Amazon. They state never charge battery while hooked up. How would that work? Quote 2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1 Link to comment Share on other sites More sharing options...
oldjohnt Posted November 21, 2019 Report Share Posted November 21, 2019 Glenn, good question but I have no idea what "they" are talking about. I'm rusty as an engineer being so long retired, but believe the laws of physics still apply. Any black box device which converts DC of X volts to DC of Y Volts IS NOT 100% EFFICIENT there are heat losses, same as for Inverters or Chargers etc. I don't understand "never charge battery while hooked up" If I recall you are going to use a 24 or 48 volt system but need a DC to DC Converter to power up 12 VDC appliances. If so that's all well n good but as you know its NOT 100% efficient. Perhaps ?? They mean when no load is applied to the devices output it doesn't draw any current from its input source ??? If so I like that !! John T Sorry I just don't understand what they are talking about Quote Link to comment Share on other sites More sharing options...
Darryl&Rita Posted November 21, 2019 Report Share Posted November 21, 2019 Chinglish. Poor translation skills. Quote I have been wrong before, I'll probably be wrong again. 2000 Kenworth T 2000 w/N-14 and 10 speed Gen1 Autoshift, deck built by Star Fabrication 2006 smart fourtwo cdi cabriolet 2007 32.5' Fleetwood QuantumPlease e-mail us here. Link to comment Share on other sites More sharing options...
Daveh Posted November 21, 2019 Report Share Posted November 21, 2019 Glenn look at the Orion ones by Victron. More expensive but not horrible. Quote Dave and Lana Hasper Link to comment Share on other sites More sharing options...
Lance A Lott Posted November 21, 2019 Report Share Posted November 21, 2019 Glen if you take it literally they dont want you putting power into battery bank while using the product. If this is what they mean it sure would not work well with a solar set up. I am unsure of your battery setup but if you are using 6 volt in series the first two will give you 12 volts. Quote Link to comment Share on other sites More sharing options...
GlennWest Posted November 21, 2019 Author Report Share Posted November 21, 2019 Oh, 48v lithium battery packs. I did not want to go Victron since I need at least 50 amps. Was going to get 60 amp unit. I would have to buy two and that price I can buy a lot of 12v batteries. That why wanting to try these Chinese units. 100.00 dollars so if it doesn't hold up not out of a lot. Quote 2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1 Link to comment Share on other sites More sharing options...
GlennWest Posted November 22, 2019 Author Report Share Posted November 22, 2019 oh, found one that works while battery being charged with solar, wind,etc. Ordering that one. Quote 2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1 Link to comment Share on other sites More sharing options...
Ray,IN Posted November 22, 2019 Report Share Posted November 22, 2019 2 hours ago, GlennWest said: oh, found one that works while battery being charged with solar, wind,etc. Ordering that one. Plus, Amazon has an excellent return policy, even for outside sellers. Quote 2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG retired;Good Sam Life member,FMCA ." And so, my fellow Americans: ask not what your country can do for you--ask what you can do for your country. John F. Kennedy 20 Jan 1961 Link to comment Share on other sites More sharing options...
Sehc Posted November 22, 2019 Report Share Posted November 22, 2019 They all have a range of acceptable voltage. That maybe exceeded if it is charging voltage rather than battery voltage. Quote Link to comment Share on other sites More sharing options...
hemsteadc Posted November 22, 2019 Report Share Posted November 22, 2019 I wouldn't be wasting 100 bux on anything not fit for the job. Victron makes robust converters. Quote Link to comment Share on other sites More sharing options...
noteven Posted November 22, 2019 Report Share Posted November 22, 2019 Glenn - please not to be burning down of your home to save $ Quote "Are we there yet?" asked no motorcycle rider, ever. Link to comment Share on other sites More sharing options...
Daveh Posted November 22, 2019 Report Share Posted November 22, 2019 I also think you are making a mistake here Glenn. Don't put unknown components in the middle of a very nice system. \ Quote Dave and Lana Hasper Link to comment Share on other sites More sharing options...
GlennWest Posted November 22, 2019 Author Report Share Posted November 22, 2019 (edited) But the Orion unit is also a charger. Don't need that. All I need is a simple bulk converter. Could use my existing converter but it is inefficient compare to a dc/dc unithttps://www.amazon.com/HUAZHU-Converter-Step-Down-Module-Waterproof/dp/B07Z2NN95X/ref=mp_s_a_1_6?keywords=48v+to+12v+converter+60+amp&qid=1574454438&sr=8-6 Edited November 22, 2019 by GlennWest Quote 2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1 Link to comment Share on other sites More sharing options...
hemsteadc Posted November 22, 2019 Report Share Posted November 22, 2019 (edited) FROM the specs on the above linked converter: "1. Can not used long time Under the MAX. LISTED LOAD POWER." LOL. Sounds like 'me love you long time'. Don't waste your time on that cheap Chinese unit. Notice (as you mentioned) max input voltage is 50. Your batteries at rest will be around 52v, even more when they're being charged. If need be you can parallel a couple Victrons. Yeah, they're expensive, but there's a reason for that. Edited November 22, 2019 by hemsteadc Quote Link to comment Share on other sites More sharing options...
GlennWest Posted November 22, 2019 Author Report Share Posted November 22, 2019 states 30-60 volts Quote 2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1 Link to comment Share on other sites More sharing options...
hemsteadc Posted November 22, 2019 Report Share Posted November 22, 2019 (edited) * Input Rated Voltage: DC 36V 48V 30-50V Which one are you going to believe? (original post edited to show 50) Edited November 22, 2019 by hemsteadc Quote Link to comment Share on other sites More sharing options...
GlennWest Posted November 22, 2019 Author Report Share Posted November 22, 2019 one is a typo i believe. States 30-60 twice. Will know soon. I do appreciate your concern though. Quote 2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1 Link to comment Share on other sites More sharing options...
Daveh Posted November 22, 2019 Report Share Posted November 22, 2019 I was referring to Victron line of 24 to 12 volt dc to dc converters. Forgot you were using 48. They are not chargers but can be used as a charger to charge a 12 volt pack from a 24. This is a 48 https://www.invertersupply.com/index.php?main_page=product_info&products_id=185548&gclid=Cj0KCQiAq97uBRCwARIsADTziyZiZIbbIKXI7gTH0gv4aZ6xiMWXEqvejggGhEbwkTrCujdYfQkdrnQaAtekEALw_wcB Quote Dave and Lana Hasper Link to comment Share on other sites More sharing options...
GlennWest Posted November 22, 2019 Author Report Share Posted November 22, 2019 9 minutes ago, Daveh said: I was referring to Victron line of 24 to 12 volt dc to dc converters. Forgot you were using 48. They are not chargers but can be used as a charger to charge a 12 volt pack from a 24. This is a 48 https://www.invertersupply.com/index.php?main_page=product_info&products_id=185548&gclid=Cj0KCQiAq97uBRCwARIsADTziyZiZIbbIKXI7gTH0gv4aZ6xiMWXEqvejggGhEbwkTrCujdYfQkdrnQaAtekEALw_wcB sorry Dave but that is a 24v. Victron doesn't make a 60 amp unit. Would have to buy at least 2. Quote 2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1 Link to comment Share on other sites More sharing options...
ALLOY Posted November 25, 2019 Report Share Posted November 25, 2019 On 11/21/2019 at 10:16 AM, GlennWest said: That why wanting to try these Chinese units. 100.00 dollars so if it doesn't hold up not out of a lot. . ......what will it do to the batteries (FLA or Lithium) though? Quote 2011 Cameo 34SB3 Link to comment Share on other sites More sharing options...
GlennWest Posted November 25, 2019 Author Report Share Posted November 25, 2019 (edited) Oh, it will be fused Edited November 25, 2019 by GlennWest Quote 2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1 Link to comment Share on other sites More sharing options...
ALLOY Posted December 2, 2019 Report Share Posted December 2, 2019 On 11/25/2019 at 1:42 AM, GlennWest said: Oh, it will be fused Does it controlcharing so the battery bank is not over/under charged? FLA is bulk 4 stage bulk - absorb - float - standby - equalize (sometimes) Lithium is 2 stage - bulk - float (cutoff after X minutes) with temp & voltage disconnects Quote 2011 Cameo 34SB3 Link to comment Share on other sites More sharing options...
GlennWest Posted December 2, 2019 Author Report Share Posted December 2, 2019 Just now, ALLOY said: Does it controlcharing so the battery bank is not over/under charged? FLA is bulk 4 stage bulk - absorb - float - standby - equalize (sometimes) Lithium is 2 stage - bulk - float (cutoff after X minutes) with temp & voltage disconnects Do What? It won't be charging anything. Simply suppling trailer with 12v from 48v. Quote 2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1 Link to comment Share on other sites More sharing options...
sushidog Posted December 2, 2019 Report Share Posted December 2, 2019 (edited) To solve the problem of the large amperage draw of the slide motor I decided to just go with 2 battery banks. I have 620 watts of solar charging a couple GC-2s for my 12v needs. I mounted these panels on the side of my MH leaving the entire roof free for racking 9, 320w solar panels front to rear for my 48v system. This will charge a much larger 48v bank for my big inverter and 48v DC mini-split heat pump. Not only is this setup cheaper than a big 48-12v DC-DC inverter, but it provides additional energy storage as well as not suffering any inefficiency in the conversion process. Plus I have a small (600w) PSW 12v inverter that I use to power my entertainment center, computer and printer. It also serves as a back-up for minor 110v needs should the main 48v inverter go down. Also should the coach battery prove too weak to start my MH one day, these 2 GC-2 house batteries have enough starting amps to help start my coach. The coach manufacturer provided a dash mounted starter boost switch for this very purpose. I wouldn't lose this safety feature by eliminating my 12v house batteries. If I'm just using a limited amp (say 50 amp) DC-DC converter it may be powerful enough to work the slide, and start the generator, but not enough to start the engine in an emergency. Chip Edited December 2, 2019 by sushidog Quote Link to comment Share on other sites More sharing options...
GlennWest Posted December 2, 2019 Author Report Share Posted December 2, 2019 I don't have a motorhome though. No onboard generator, so no real need for 12v batteries. Slideouts are on 50 amp relays. Quote 2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1 Link to comment Share on other sites More sharing options...
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