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 > A Fumbling I Will Go MEGAWATT. Photobucket To Dropbos

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MEXICOWANDERER

las peñas, michoacan, mexico

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Joined: 06/01/2007

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Posted: 07/07/17 12:12am Link  |  Quote  |  Print  |  Notify Moderator

Two power units = unity power or Flexibility. In tandem 90 amperes charge rate

Separate:
a) Redundant safety factor. One fails the 2nd can take over
b) Individual voltage controls. Different batteries different temperatures.
c) Schottky rectifier isolates the units. No isolator no parallel operation*
d) Timer on one charger. Allows it to be absorbsion charger with time limit
e) When timer shuts off unit # 1, unit # 2 continues as a float charger no timer

So in essence if there is 6 cells of batteries, the Borg will charge them. Flooded, calcium, gelled, AGM. 12 hour timer can allow for a very big bank. Voltage set-point span 11.7 - 15.44

A voltage adjustment for each charger allows it to bulk charge or float anywhere I set it.

Set the voltage way way back. Start THREE HUNDRED WATT generator. Increase voltage just until generator starts to lug down. Must be increased every half hour. Or not.

Charge batteries 110F? No problem. -35F still no problem.

Important thing is when up to 12 hour timer runs down, 2nd charger set at float takes over automatically. Set it and forget it.

Weak Mexican power? Compensate. Turn voltage down to start off with then tweak up every so often.

*These power supply chargers can not work in tandem. One will shut down. The 500 ampere rated schottky is so huge it absolutely minimizes heat, and has a forward voltage drop of .17 at low or no load.

--------------------------------------------------------------------------------

Timer charging is not critical when it comes to over charging. Who cares if the Borg absorbsion charger runs at 14.7 volts for one or five hours "too long"? The battery doesn't care. I don't care.

The BORG primary use is as a BATTERY CHARGER. Not a converter, inverter or perverter. It is incredibly flexible. And my 12 year old granddaughter works it just fine. She has started cars, charged the family fishing boat battery, then connected it to the Lifeline. Without an error or hesitation.

And Rashneesh the programmer, of Calcutta and the Lucky Dragon integrated circuit company had nothing to do with any of it...

theoldwizard1

SE MI

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Joined: 09/07/2010

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Posted: 07/07/17 05:13pm Link  |  Quote  |  Print  |  Notify Moderator

MEXICOWANDERER wrote:


b) Individual voltage controls. Different batteries different temperatures.
c) Schottky rectifier isolates the units. No isolator no parallel operation*
d) Timer on one charger. Allows it to be absorbsion charger with time limit
e) When timer shuts off unit # 1, unit # 2 continues as a float charger no timer

Okay, I get it ! A bit "crude", but very effective !

But what about bulk charging ?

MEXICOWANDERER

las peñas, michoacan, mexico

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Posted: 07/07/17 06:10pm Link  |  Quote  |  Print  |  Notify Moderator

A $25,000* programmed controller interfacing with a 32 port $5,000 A to D interface and a few grand for FETs and SCRs would make it "easier".

The computer is reasonable. Three weeks of programmer's time, then two weeks of de-bugging, isn't cheap.

BULK CHARGING

We have a say 400 amp hour, 200 usable at 50% SOC

Down 200 amp hours, huh? Let's let the dominant Megawatt the one with the 12 hour time do ALL the work. No we are not using generator power for this one.

Dial in 14.8 voltage regulated on the pot. Five hours theoretical at 40 amperes charge rate is a pipe dream. Let's do a mental calisthenics and rudely GUESS (8) eight hours of bulk charge.

After all, this is the FIRST TIME the Borg will be used on this a flooded lead acid 400 amp hour battery bank.

Twist the timer to 8 hours.

Bored?

Come back in say 6 hours and see how the cells are doing.
6 hours and only four are bubbling? We weren't far off in our timer guess.

Return to find the timer shut of. AHHHH SUGAR! bigdeal. Twist the timer a tad then look at the cells. Oooooo they're all bubbling. The 8 hour guess was right on target. Not on target? Goose the timer another hour or so. Add that to the 8 hours.

Batteries are not feminine. They do not change their mind. If it took 9 hours this time it will take 9 hours the next time. 74% state of charge? Maybe 3 hours? This isn't a nuclear "psychics" crystal ball subject - an exact number or the plutonium will get angry.

Amplitude configured with time voltage/time is what determines when and how vigorously a flooded battery will start gassing. Higher than 14.8 volts gassing rapidly becomes overly sensitive to time spent at that voltage. Still worried. Fine. Set the voltage back to 14.7 or 14.5. Whatever you wish.

WITH A GENERATOR

Mama and Papa bear both go to work if the battery bank size warrants it. Dial both chargers up to 14.7 The one charger has a timer the second one doesn't. So a person can't do this and go over to friend's and watch a football game, drinking martinis a few hundred campsites distant.

Again, learn from the first episode how long it takes to get the cells bubbling.

Having an on-board ammeter makes this child's play. At 14.8 volts and a slump down to "X" amperes means the slightly bubbling batteries are charged.

This recipe may not be suitable for individuals who self induce short-term memory loss.

CRUDE means EFFECTIVE, and it means VERSATILE. When I go camping with $400 worth of batteries, I do not want to receive $300 worth of battery performance because a smart charger is insane and cannot tell a properly charged battery from ----.

If I EVER get Soooooooo lazy camping, that this CHARGER (not converter) overtaxes my energy or mental facilities, it it time to sell the rig, and go somewhere where room service is but just a "Dial 0" away.

But then I do not haul an $80,000 rig 300 miles, park, slam all the shutters closed, raise the satellite dish and tune in a television reality show depicting a crackling campfire while I watch DVD homicide dramas on another monitor, while the DW orders up elivered ribs and cracks a bottle of sparkling burgundy.

jolooote

Miami, FL

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Joined: 01/29/2002

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Posted: 07/07/17 09:35pm Link  |  Quote  |  Print  |  Notify Moderator

OMG! Guess my interest in and possible learning something new of what the heck he's doing BOTHERED him... wutevahhh. lol


Joe & Charlotte, 2015 Thor Vegas 24.1 Ford E-350 305hp V10 5speed, Jeep Wrangler & Honda Element 'TOADS'
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