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 > Your search for 'Megawatt' found 186 matches.

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  Subject Author Date Posted Forum
RE: Got my new (used) batteries!! Now, how do I rejuvenate them?

Naio, According to your post you are doing everything correctly. The battery you reported on should be put into service and with those thick plates should give you long, trouble-free service. A lot of this chatter deals with nuances. I should make myself clearer as to what is interesting versus what is important. Once Delta T voltage slump is established, compensated voltage should be noted then can be dialed-into the initial power supply setting when voltage is pre-set meaning before the cables are connected to the battery. For instance, my power supplies. Lambda, Meanwell, and Megawatt all slump when connected to battery. This means, the converter will show say 14.70 volts with cables disconnected, but then settle on 14.51 when connected. Voltage does not rise to 14.52 What to do? Then, do not pre-set the disconnected voltage at 14.70. It will be .19 volts too low. Twist the adjustment pot to 14.70 + .19 volt = 14.89 Disconnected pre-set voltage thusly will be set at 14.89 Monitor finish voltage to be sure this is a correct assumption and tweak accordingly. Different types of batteries will have different amounts of Delta T voltage slump. Types of batteries, not size or state of charge. Once the Delta T compensation is set, it is set. Note it. Write it down on a strip of masking tape. Example: 14.70 set to 14.89 13.30 set to 13.39
MEXICOWANDERER 06/22/17 12:30pm Tech Issues
RE: Got my new (used) batteries!! Now, how do I rejuvenate them?

Thank you, both of you :). One of my remaining batteries is at 12.35. Should I do anything differently with it, due to low SOC? Will the Megawatt keep itself to 36amps, or do I need to wstch and lower voltage to keep amps from going too high? Any other special considerations for that low a battery?
Naio 06/22/17 12:15pm Tech Issues
RE: Got my new (used) batteries!! Now, how do I rejuvenate them?

While not personally familiar with the Megawatt, I do not need to constantly fiddle with voltage pot on my Meanwell if I do not want. I can set it to 14.7v and the battery terminals will be somewhat lower than this depending on how many amps are flowing and how depleted the battery is. When there are no dc loads on a charging battery, and the amperage increases to hold the same voltage, well Mex once said during teh screw31 thread, that this was the very beginnings of thermal runaway, and I stopped charging, or monitored heat build up closely when I saw this occur, on my old flooded battery. Never saw it on my AGM. While charging slows a lot at 13.6v, compared to 14.7v, rather than turning it on and off, if you've got shore power I'd set MW voltage to 13.6ish, and let it go when you do not want to have to monitor it and then goose it to 14.7 when you can be there to monitor amperage and temperature. 13.6v is not going to heat a AGM battery at 77f ambient. The Micropotentiometers provided with these powersupplies are not meant for constant adjustment. They are rated for only 25 or 50 cycles, and that is a Bourns brand( usually blue in color). Who knows what the cheaper orange ones are rated at. I hope the simple instructions as to how to replace the provided pot with a 10 turn upgraded pot can be published soon. I've done it on the cheapowatt, and my Meanwell. I removed electronic guts from casing to do so, but I think Mex has a method for accomplishing this without removing the guts to access underside. Removing the guts is pretty easy, but one should have new thermal grease for reassembly as the transistors using the casing as a heatsink.
landyacht318 06/22/17 11:49am Tech Issues
Another Megawatt Upgrade Want To Post Article

Pictures and text. Is there an easy to use upload service that can retain a created article? The upgrade article would include the entire process divided into chapters. Easy disassembly & reassembly How to choose, buy and install a voltage adjustment potentiometer If needed, how to replace the weakest components (caps and rectifiers) in the Megawatt. This turns the Megawatt into one tough charger. These things are not nerd techhie grade mods. If you can handle a cheap 15 watt soldering pencil, you can do this stuff so easy it hurts. But I need a kindergartener's grade upload site to start the process. Any ideas? Thank You
MEXICOWANDERER 06/21/17 12:05pm Tech Issues
RE: Megawatt Upgrade eBay/Mouser Parts List (save to disk)

Mr Wiz Question, Can you make this part of the Megawatt upgrade project, when and if that is released? And you haven't released (published) it yet, have you? or where can I buy the book? I too am waiting for the upgrade project pics and instructions. Have all the parts. The pot is getting very hard to adjust now, wearing out....
Byrogie 06/19/17 11:37am Tech Issues
RE: Megawatt Upgrade eBay/Mouser Parts List (save to disk)

Mr Wiz Question, Can you make this part of the Megawatt upgrade project, when and if that is released? And you haven't released (published) it yet, have you? or where can I buy the book?
MiPaJacks 06/19/17 08:20am Tech Issues
RE: Megawatt Upgrade eBay/Mouser Parts List (save to disk)

I didn't know what a Megawatt was and I wouldn't know what to do with a capacitor or rectifier. I have a nearly brand new 3000W inverter and it has some burned somethings (MOSFET transisters?) that would get it running again. Instead I suspect it's going in the trash.
Bill.Satellite 06/19/17 06:50am Tech Issues
RE: Megawatt Upgrade eBay/Mouser Parts List (save to disk)

Qty needed (2) of each. How many of the Panasonic Capacitors is needed per megawatt? Do I need to buy 2 sets of 4 capacitors or use 2 of the 4 capacitors that are included in the Ebay auction?
Vixen21 06/18/17 11:49pm Tech Issues
RE: Megawatt Upgrade eBay/Mouser Parts List (save to disk)

not to be facetious but BILL i think you know what filter capacitors and rectifiers are Am I wrong ? do you not know what they are, are you unable to look at eBay picture and understand the Idea at these are higher quality replacement parts that will extend the life of a megaWatt power supply used as an adjustable battery charger
MrWizard 06/18/17 07:44pm Tech Issues
RE: Megawatt Upgrade eBay/Mouser Parts List (save to disk)

Sure. The Panasonic Megawatt has a few anomalies. The original machine had a base plate of prefabulated aluminite, surmounted by a malleable logarithmic casing in such a way that the two main spurving bearings were in a direct line with the pentametric fan. The latter consisted simply of six hydrocoptic marzlevanes, so fitted to the ambifacient lunar waneshaft that side fumbling was effectively prevented. The main winding was of the normal lotus-o-delta type placed in panendermic semi-bovoid slots in the stator, every seventh conductor being connected by a nonreversible tremie pipe to the differential girdlespring on the "up" end of the grammeters.
Home Skillet 06/18/17 05:34pm Tech Issues
Megawatt Upgrade eBay/Mouser Parts List (save to disk)

http://www.ebay.ca/itm/4pcs-panasonic-HC-680mfd-200V-680UF-electrolytic-Capacitor-22-40mm-105-C-/141657678529?hash=item20fb74a2c1:g:UUcAAOSw~gRVkhBh http://www.mouser.com/ProductDetail/Vishay/VS-80CPQ150PBF/?qs=sGAEpiMZZMtQ8nqTKtFS%2fJSNqGZMTeJUjHxBCFnVWHs%3d Qty needed (2) of each. Replacement of capacitors and rectifiers is a quantum leap in durability for the weakest parts in the Megawatt. These parts are a snap to change out. Upgrade from 60 amp to 160 amps capacity and to 150 volts PIV. These rectifiers run much cooler than the originals. The Panasonic ESR capacitors replace the # 1 Megawatt circuit failure component. Like the rectifiers above these capacitors run cooler. I have tortured them and they did not fail. This is a -can do- upgrade for anyone who can solder.
MEXICOWANDERER 06/18/17 04:23pm Tech Issues
RE: Got my new (used) batteries!! Now, how do I rejuvenate them?

Go back and reset the Megawatt to 14.7 volts. Start it up How many amps is the battery drawing? The amperage at set voltage is what tells you if the battery is charged or not. If your Megawatt is to remain at a battery finish voltage of 14.70 the potentiometer need not be touched again. The digital ammeter that needs no shunt as recommended by Mr. Wizard is wonderful as an independent amperage (dedicated) instrument. NERD AREA Finish resting voltage is a danged poor indication of whether material embedded in plates has been converted into solution. it takes a microscopic area of reverted plate to allow a convoluted path of electrons to flow from negative to positive. "Did you clean the windows?" "Yes" "They are still dirty" "No. Look at this clean spot, and the one on the window over there, and..." Amperage decreased to a specified value using a specific voltage applied INSURES plate material MUST go back into solution. Like TIME and TEMPERATURE baking a cake. One is useless without the other.
MEXICOWANDERER 06/18/17 02:23pm Tech Issues
RE: Got my new (used) batteries!! Now, how do I rejuvenate them?

The unit I let the smoke out of, intentionally might I add, was the Etopxizu 23$ cheapowatt 30 amp power supply, which had NO overvoltage, overcurrent/overtemperature protections built in. The Megawatt has those protections built in, but I would certainly recommend increasing ventilation if hooking it to a depleted battery which can max it out for more than 5 minutes. When I say intentionally, I mean I got tired of twiddling the voltage pot to keep its amperage below 36.2 amps but up near that level, above which there would be some unnatural sounding buzzing occurring. I had by this time wired up an external potentiometer a better 60Mm fan, and had an Ammeter inline, so voltage twiddling was not the ordeal it is with the tiny 3 cent pot the unit came with, buut it was still enough that I said screw it, and set it to 14.9v unloaded, then hooked it to the well depleted screwy 31, and after 17 minutes of 38+ amps, the magic smoke escaped and I ordered the meanwell rsp-500-15 which has been fully charging my batteries, or floating them at the voltage I have chosen, ever since. And I disagree with a 24 hour resting voltage as dictating full. The screwy 31 has been off the charger for 48+ hours and is reading 12.92v, and 24 hours ago was at 12.94v. I know eventually it will settle to 12.78v, and this is with one cell that will never get above 1.265 SG. Battery temperature plays a huge part in how soon resting full charge voltage settles to what it should be. Use an Ammeter at absorption votlage to determine full, not a 24 hour resting voltage. Not without the battery temperature and previous experiences with that specific battery to compare to. The beauty of these adjustable voltage power supplies is that one can hold absorption voltage until those amps taper to the 'full' point. Once full is established by the ammeter at a temperature compensated absorption voltage, then one can watch the resting voltage fall, and take notes as to how quickly it fell to what it ultimately levelled out at, At that specific battery temperature, and then make future comparisons, on that specific battery.
landyacht318 06/18/17 02:03pm Tech Issues
RE: Got my new (used) batteries!! Now, how do I rejuvenate them?

when a battery is low, there will always be voltage slump when connected let it charge for awhile and watch it rise there is danger in turning it up to 14.7 when the battery is low and pulling amps the danger is to the megawatt, Not the battery crank it up and you might find the battery taking more amps the 30a the mega is designed for, i think Landy did that and let the smoke out
MrWizard 06/18/17 12:30pm Tech Issues
RE: Got my new (used) batteries!! Now, how do I rejuvenate them?

Kudos to the point of... You are engaged in what many Y chromosome snorting males on this forum are themselves too timid to try. I guarantee you it's like riding a bicycle. The few first solos are hair raising. But give it a bit of time and soon you will be doing hand stands on the handlebars. I packed and transported the BORG 500 miles this month. Even though the unit has ten turn voltage adjustment, when I plugged it in, I found 12.3 volts on one Megawatt and 14.85 on the other. Just plug it in and check voltage BEFORE clamping the battery cables onto the battery. Voltage will ALWAYS be two or three tenths higher unconnected than with the cables clamped onto the battery terminals. This is an EXCELLENT unintentional safety feature. Preset the voltage. Then connect to the battery. When battery charges and voltage rises to it's maximum, tweak the potentiometer up a tad. A battery at near but not quite full charge can take nowhere near the full amperage potential of your Megawatt. So when you do the final tweak, what you see on your meter will be the final voltage. NOTE the difference between your first setting and exactly how much more you need to tweak the pot to get final desired voltage EXAMPLE Set voltage to 14.7 but final voltage when connected reads 14.48. This is easy to tell because amperage has drooped low. Say to 10 amps. But voltage reads 14.48. You need to tweak the pot to gain .22 volts to get 14.70 volts, right? Well guess what? Do not set voltage to 14.70 volts before connecting the cables to the battery. Set the voltage 14.70 + .22 volts. Your meter will read 14.92 volts. THEN connect cables to the battery. This disconnected - vs connected voltage difference is referred to as SLUMP. Try it. It works like a charm. I can see absolutely nothing you are doing wrong or are missing here. You are doing a good job. It's time to stop walking on eggshells. In the short time it takes to stand on the handlebars you will end up laughing. You are missing a power timer on-off switch for the AC electricity. Look at an INTERMATIC 4-hour timer of eBay. I will walk you through how to connect it. This turns the Megawatt into a purring kitty.
MEXICOWANDERER 06/18/17 11:45am Tech Issues
RE: Got my new (used) batteries!! Now, how do I rejuvenate them?

I sent John Marles, an email yesterday informing him that crummy pot is a big detraction from the attraction of the Megawatt. Not everyone has the ability to do a multiple turn pot upgrade. What a shame.
MEXICOWANDERER 06/16/17 05:05pm Tech Issues
RE: Got my new (used) batteries!! Now, how do I rejuvenate them?

With a Q-tip, carefully smoodge Vaseline petroleum jelly onto the unused terminals. Then there is no worry about silicone getting on them. Yes I am referring to the battery 12 volt DC terminals. The power AC terminals must be buried to the hilt. NONE of these power supplies seem to have an insulated case. Without a connected earth ground, I am averaging 67 volts AC measured on the case. Make absolutely sure whatever you plug into has a working earth ground terminal on the receptacle. And that on the receptacle "hot" is "hot" and neutral is neutral. Hot and Neutral reversed means 110+ volts AC present on the case. Connect a DC handheld meter to the alligator clips. Set to 20 volts DC. Turn on the unit, by your switch or by plugging it in. It does fine not connected to anything. What voltage do you see on your meter? The blue and white little box to the left of the terminal strip is the adjustment pot. Think of it as having electronic PMS. The slightest twist clockwise with a tiny screwdriver will have the voltage jump upward. Too touchy but Meanwell's, Megawatts, CheapOwatts, and Lambda power supplies all act the same way. Stupid engineering. Twiddle, nudge, tweak and do whatever it takes to get 14.4 volts (right hand most meter digit unimportant right now. Got 14.4 volts? Good. Turn unit off. Connect your jumper clamps to the battery posts. Reconnect the Megawatt. Monitor the voltage. Did voltage instantly jump to the same reading as you got when you tested voltage when disconnected? Good. Or is the voltage lower but rising on your meter? If this is the case you need to wait until it stops rising. Expect disconnected voltage setting and connected voltage reading to be slightly different. Always use the connected to battery voltage reading. If you lose "where you're at" voltage setting wise, disconnect from battery and start over. This eliminates "OhgollygeewhizIscrewedup" This sounds complicated, right? Bet'cha you end up doing a setup in under 15 seconds, especially when you fathom the inherent connected to battery voltage droop and pre-compensate before you connect. Just watch the sensitivity of that @#$%&! pot. When in doubt, disconnect the jumpers and verify voltage setting.
MEXICOWANDERER 06/16/17 02:11pm Tech Issues
RE: Got my new (used) batteries!! Now, how do I rejuvenate them?

Here is my wired-up Megawatt, if anyone wants to tell me I did something wrong before I glop it up with silicone :B The AC cord came with the unit. I have pulled hard on all connections and they are solid. Any hints on setting the initial voltage before I start fiddling it? (I can't seem to remember how to embed pics from imgur, or something has changed. I will look into it but so many chores today and I want to work on those batteries!)
Naio 06/16/17 01:01pm Tech Issues
RE: Got my new (used) batteries!! Now, how do I rejuvenate them?

Too bad Mr. Wizard's recommended inductive panel ammeter has a poor voltmeter. But glued to the top of the Megawatt case with GOOP, his inductive ammeter plus a reliable voltmeter (I like the DROK 5-digit) will do anything you want to do. single space decimal point accuracy 13.47v will only display as 13.4v 3 numbers 1 decimal point, https://www.amazon.com/dp/B01DDQM5PK i found it on Amazon i put one on each of my two converters, the mounted PD-70 and the adjustable 75 boondocker, i use as a portable https://images-na.ssl-images-amazon.com/images/I/51cQ7HzEohL._SL1200_.jpg width=400
MrWizard 06/15/17 03:46pm Tech Issues
RE: Got my new (used) batteries!! Now, how do I rejuvenate them?

The 36 amp Megawatt would be taxed to try and overheat a larger telecomm AGM battery. Stick your finger onto the lead terminals on top of the battery. Anything approaching 115F will cause an "Ow! Dammit!" level is discomfort. Conditioning is a separate matter from an AGM "tuneup" freshening charge. I really encourage the download and reading of Lifeline's AGM PDF battery manual for a GENERALIZED overview of what AGM batteries do and don't do. Ignore the charging specifications and recommendations. Your telecomm battery is a different genre. The manual can be a Dick & Jane primer as well as definitive guide to Lifeline management. PRESET the Megawatt to 14.4 volts with the battery charging leads disconnected. The voltage setting WILL SLUMP somewhat when actually connected to a battery so be prepared to re-tweak. Connect the AC power. Too bad Mr. Wizard's recommended inductive panel ammeter has a poor voltmeter. But glued to the top of the Megawatt case with GOOP, his inductive ammeter plus a reliable voltmeter (I like the DROK 5-digit) will do anything you want to do. The Megawatt has three positive + connections and three negative - connections on the terminal strip bar. Wire the ammeter and wire the voltmeter to the terminal strip screws and you will have one impressive machine. To get fancy an "L" shaped plastic meter plate to set the meters in would be great. But where would a person look for an L shaped piece of plastic suitable to set the meters in? Hint hint. Glue the L base to the Megawatt with (what else?) Goop adhesive. Plastic is easy to drill and file to get small rectangular holes for the meters. The meters have hook prongs so push them into the meter holes and SNAP. Done deal.
MEXICOWANDERER 06/15/17 01:09pm Tech Issues
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