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 > Your search for 'Megawatt' found 110 matches.

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  Subject Author Date Posted Forum
RE: Solar wiring question

I've installed over a megawatt of PV panels and not seen any with aluminum wire. I've run several miles of PV wire and not seen any #10 or #12 that is aluminum. You aren't supposed to hook more than 2 panels (or strings of panels) in parallel without over current protection to each string. So, just connecting 3 panels in parallel to bus bars or thru Y connectors isn't recommended. Technically #12 isn't big enough for 3 panels in parallel. Solar arrays are considered "continuous" current by the NEC's definition so you have to multiply the Isc by 125%. You also have to multiply by another 125% to account for the fact that solar panels can put out more than their rated current under certain conditions. This means you really end up multiplying the Isc by 156%. This means your main wire down from the roof, with three panels, needs to be able to handle 29.67 amps. That means even #10 is barely large enough. I would either replace your charge controller with an MPPT unit that allows you to run all 3 panels in series or upgrade your wire to at least #8 and put a fused combiner box on the roof.
KD4UPL 03/08/19 11:22am Tech Issues
RE: One more battery question

I use the Capacity/10 (C/10) rule for both charging and controlled discharging. Meaning if your battery has 100Ah capacity, discharge and charge at 10A. If they are 225Ah, do it at 22.5A. I'll run them down to 12.3V resting voltage. Once it's fully charged, measure the SG and equalize charge as needed. My batteries are 100Ah so I discharge with a msw inverter and a 100W lamp and charge with either an HP or MegaWatt power supply. The HP has constant current mode so I prefer it
2112 01/27/19 03:17am Tech Issues
RE: All electric vehicles?

Hi, You all know I'm a solar and Bev supporter but distributed generation is a nightmare for power companies. They currently have to be able to handle 100% of the peak load. We need cheap efficient storage that does not degrade over time. Size doesn't matter much, but the materials going into these 1000 megawatt banks need to be dirt cheap. Wiki says about 6.5% loss in electrical transmission. Of course distributed generation (solar) will reduce the losses and the need for additional transmission lines.
pianotuna 01/22/19 08:47am Tow Vehicles
RE: Trojan T-1275 Trouble

You can boost the Megawatt output to over 16V with THIS. There are lesser boost modules if the 30A model is overkill.
2112 01/12/19 06:40pm Tech Issues
RE: Trojan T-1275 Trouble

Another thought is to use a simple power supply to drive the Schneider charge controller and don't even use the camper's built in charger. I'm sure that your suggestion to get another charger would work, but wouldn't it be more cost effective to make use of what I already have? I think that is what I would do ! You do not need a 30V power supply. If you are NOT going to equalize (i.e. leave the charge controller on manual equalize mode) than a power supply capable of providing at least 1V MORE than the Bulk Charging Voltage should be sufficient. In other posts Megawatt Power Supplies have gotten good reviews. While their supplies only claim a maximum output of 15.5V if you called and asked I'll bet they can set you up with one that would do 16V.
theoldwizard1 01/11/19 04:06pm Tech Issues
RE: Winnebago Electric Motorhome on a F-53 chassis

fair enough. The numbers are probably right. Good to have a baseline as it will just improve from here. Battery cost needs to keep declining along with energy density. We are not at the end of the curve yet IMO. Don't get me wrong I think electric RV's will happen I am just skeptical it will be very soon. I would be surprised to see any widespread production ones in the next 10 years. I would be glad to be proven wrong. Long distance highway travel for a large vehicle is the most extreme application of an electric vehicle due to battery cost and weight. The Tesla semi is boggling in the numbers, megawatt hour batteries, megawatt chargers, 4 motors at 1000hp / 2000lb-ft of torque. I am very skeptical they can pull it off at the costs they are claiming without losing money on it, again hope to be proven wrong. I used to think how great it would be if an RV was setup like a diesel electric train, maybe multiple generators for redundancy etc. But once you do the math you realize how that just not feasible. Trains and some boats do it for specific reasons while accepting the downsides. Those downsides are just too great for weight and size constrained road vehicles. Thinking about an RV with Tesla semi size battery though that gives me goosebumps. Run the a/c offgrid for almost a month! No generator noise. Slow charge off solar, or any wall plug you can find. Won't get you far but maybe enough to get to a real charger. Truly all electric setup, will be fun.
jharrell 12/19/18 06:27am Class A Motorhomes
RE: Winnebago Electric Motorhome on a F-53 chassis

,,, The charger to charge the thing in a hour needs to put out a solid megawatt that's like powering a 1000 homes. If you plugged it into a campsite 50 amp service it would over 80 hours at full blast to recharge. And that's 80 hours ONLY if every watt available from camp ground 50Amp 120VAC split phase service is available for battery recharging. Now let's scale this up in. Consider a couple of thousand large vehicles plugging in each night and the potential demand for recharge power. The average American home consumes about 900 kWh per month. A semi or class A is consuming that much in one day. Current generation and distribution capacity is not even close to supporting this new demand. The necessary improvements will make the Tennessee Valley, Hoover Dam, Grand Coulee Dam and the Manhattan projects look like small scale residential neighborhood master planning. Rolling black outs anyone?
Dale.Traveling 12/18/18 01:06pm Class A Motorhomes
RE: Winnebago Electric Motorhome on a F-53 chassis

Just think with a diesel generator you could stop and charge every 125 miles LOL.Why stop? I've read posts where RVs run the generator while in motion... My motorhome needs about 100hp to roll down the road at 65mph. You would need a 75kw generator to keep the batteries charged. Thats a 3000 pound generator plus fuel that needs to fit somewhere in the motorhome along with a few thousand pounds of batteries and electric motors. Plus the cost of all that. Plus the fact that double conversion from the generator engine to electricity back to the motors is less efficient vs just a direct mechanical transmission. Trains do this without batteries because the need precise traction control to prevent steel wheels from slipping on the tracks, too difficult to gear that properly. This also allows for electric braking using heat strips on the top of the train. They however accept the ~80% efficiency of the electric drivetrain. My motorhomes engine,transmission fuel and generator don't even weigh 1500lbs and only a few percent losses from engine to wheels. You will notice all hybrids connect engine to wheels at highway speeds through a transmission as it is more efficient than running through the electric system. The electric system shines in stop and go city driving which motorhome don't really need. I believe the future is electric, and motorhomes will get there probably last like they do with most stuff and they will be pure electric like the Tesla semi not hybrids. Even if the power comes from fossil fuels at the power plant, power plants are more efficient at extracting power from fuel than small engines are (multi stage heat recovery) and can have much better emissions systems as they arent constrained in size and weight. Plus you can mix solar, wind and nuclear in and vehicles don't change. It will be a while before its practical though, the Tesla semi is going to have around a megawatt hour battery that weighs probably around 10,000 pounds and even if they reach $100/kwh cost that they are shooting for that's still a $100,000 battery. The charger to charge the thing in a hour needs to put out a solid megawatt that's like powering a 1000 homes. If you plugged it into a campsite 50 amp service it would over 80 hours at full blast to recharge.
jharrell 12/18/18 06:57am Class A Motorhomes
RE: Winnebago Electric Motorhome on a F-53 chassis

I wouldn't rule out that an electric Class A is coming fairly soon. Large fleet operators like Pepsi, Walmart, and Anheuser-Busch are pre-ordering Tesla's upcoming "Semi" tractor-trailers due out next year... "The Tesla Semi launched Thursday night to a host of superlatives. It’s faster, safer, and cheaper to run than anyone expected. Most of all, it will run 500 miles on a single charge, according to Tesla. The battery might have as much as 1 megawatt-hour of energy, we believe. And with a newer, super-faster Tesla Megacharger system, a trucker can add 400 miles of range in 30 minutes. The Tesla Semi will go into production in 2019, Tesla claims." Tesla Semi: 500-Mile Range, Cheaper Than Diesel, Quick to Charge
Dutch_12078 12/17/18 05:53am Class A Motorhomes
RE: Newbie trying to set up Megawatt for charging

Great. It sounds like you had the Megawatt output shorted. It's good to know how well it can take the abuse. Enjoy your trip
2112 12/17/18 03:34am Tech Issues
RE: Newbie trying to set up Megawatt for charging

SUCCESS! IT's working!! Thanks Tom M and 2112 and MEX, I had the megawatt connected to the wrong battery terminals. I switched those around and got 13.6 volts across the two batteries and my LCD amp/voltage meter that's connected to megawatt is now working. Off to Mexico Tuesday morning.
DieselBurps 12/16/18 08:23pm Tech Issues
RE: Newbie trying to set up Megawatt for charging

And connect the Megawatt as such https://i.imgur.com/5ROFOKbl.png height=240
2112 12/16/18 08:22am Tech Issues
RE: Newbie trying to set up Megawatt for charging

It sounds like your batteries are connected properly, but your Megawatt is connected to the wrong battery terminals. Connect to the positive of one battery and to the negative of the other battery. https://www.etrailer.com/static/images/pics/q/u/qu60431_800.jpg width=300
Tom_M 12/16/18 04:53am Tech Issues
RE: Newbie trying to set up Megawatt for charging

Need to check that battery wiring if series they are 'end to end' backwards or in parallel even backwards but even if parallel properly for 6v, they make a low resistance short to megawatt 14v trying to charge 6v I have thought about this, but the lights in the camper and everything else 12 volts works. I have pos+ to Neg+ connected together of the two batteries and then pos+ from camper to pos+ battery terminal, same for Neg. I also show 13 volts inside camper according to my Trimetric and solar charge controller. I am going to check things over in the morning in the light of day. I was hoping to leave for Mexico on monday.
DieselBurps 12/15/18 09:51pm Tech Issues
RE: Newbie trying to set up Megawatt for charging

When I check the voltage of the batteries, across the positive terminal on one battery and negative terminal on the other battery I get 0.02 volts, but when I check the battery individually out of the camper they show 6.2 volts Need to check that battery wiring if series they are 'end to end' backwards or in parallel even backwards but even if parallel properly for 6v, they make a low resistance short to megawatt 14v trying to charge 6v
MrWizard 12/15/18 08:40pm Tech Issues
RE: Newbie trying to set up Megawatt for charging

I am checking the battery voltage across the series link and getting the 0.02 volts. checking a single battery reveals what I would expect 6.2 volts. Switch on the side is set to 110 volts. Still confused why I get 2 volts checking the megawatt terminals with it hooked up to the batteries but when its ON but not hooked up it shows 14.8 volts like I would expect. Also my little cheap LCD volt/amp meter I have hooked up to the megawatt works when the Megawatt is on and not connected to the batteries but doesn't come on when connected to the batteries. I have been using standard hand held multi meter for all my tests.
DieselBurps 12/15/18 08:19pm Tech Issues
RE: A Simpler Explanation Of The Measurement Of ONE HORSE POWER

Compared to the fact Quicksilver needs to recharge every 2,000 miles means something as well. Nothing a 4 megawatt-hour battery can't solve plus a 12 megawatt charger to get back on the road in 15 minutes...
jharrell 12/15/18 08:09pm Tech Issues
RE: Newbie trying to set up Megawatt for charging

Well I screwed something up or I am missing something. I got the **** thing hooked up, but when I check the voltage with a multi meter on the pos. and neg of the Megawatt I get 2 volts? Seems weird. WIth the the Megawatt on but not hooked up to the batteries, it shows 14.8 volts on my multimeter. I am confused about why I am getting two very different readings. My batteries are 6 volts in series. When I check the voltage of the batteries, across the positive terminal on one battery and negative terminal on the other battery I get 0.02 volts, but when I check the battery individually out of the camper they show 6.2 volts. ?? I know the Megawatt is working because the fan comes on, and over time I can feel the cables from the Megawatt to the batteries get warm, also my Trimetric inside the camper shows the voltage rising, it started out dead at 10 volts and quickly when to 14.0 volts over an hour or so.
DieselBurps 12/15/18 07:35pm Tech Issues
RE: Newbie trying to set up Megawatt for charging

My Megawatt based Hyperwatt 400 has run one week solid (8 days) putting out 56 amps day and night. Extreme modification, two larger fans, caps and rectifiers and larger chokes. Fully recharged a 14 L-16 bank solar home (48-volt) 6 cells at a time. Owner was waiting for an Outback inverter.
MEXICOWANDERER 12/15/18 01:25pm Tech Issues
RE: Newbie trying to set up Megawatt for charging

https://www.ebay.com/itm/2pcs-Panasonic-HA-680uF-200v-105c-Radial-Electrolytic-Capacitor-25mm-X-40mm/201539338212?hash=item2eecae3fe4:g:Y~cAAOSwh-1W4uMB:rk:3:pf:0 MAJOR Capacitor upgrade https://www.ebay.com/itm/1PCS-SCHOTTKY-RECTIFIER-DIODE-IR-VISHAY-TO-247-60CPQ150-60CPQ150PBF/362255975000?hash=item5458238258:g:KgsAAOSw~CFY5zFW:rk:1:pf:0 Direct interchange 300% ampere over capacity 150% voltage increase schottky rectifier upgrade. The two upgrades plus fan ventilation above makes the Megawatt more bulletproof than any converter, inverter, perverter on the market as far as finals power is concerned.
MEXICOWANDERER 12/15/18 01:17pm Tech Issues
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