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Assimilation has occurred, The Borg Exists.

NinerBikes
Explorer
Explorer
Through the miracles of primitive battery acid chemistry the past 70 or 90 years, it was recently discovered in a tropical jungle leafy area of Mexico that necessity was the Mother of Invention.

Brought to you by "Dave's Not Here", he's down there in Mexico, wandering.






It's my understanding this is so simple, it's like that car insurance commercial by Geico, even a caveman could use it, or was it Rumsfeld saying an ape could use it, bonehead simple.


mexicowander quoted below on features:

A list of the features of THE BORG including those found on the front panel which pictures I hope to send to you tonight or tomorrow. VIA telephone imagery.

Front and rear panels are 1/4" aluminum for strength
Front panel has several lights and gauges listed below.
Green pilot at bottom is LED and is on when line voltage sensed.
Red & Green large LED pilot lights tell which Megawatt is in use. When spring-wound timer on rear runs out red lamp fails and green lamp continues indicating float or whatever #2 Mega task is underway.
Analog gauge is for ergonomics. Position of needle is like position of sun - no necessity to read numbers
Middle gauge is dual volt amp. Volt gauge is marginal 3 digit.
Bottom gauge is 4.5 digit. Accurate voltage for establishing fill of AGM battery. Least significant digit is to be ignored.
Top of charger not seen
5 position dual pole rotary switch. Select #1, #2, both or off Megawatts. Dual pole is to kill both hot and neutral Mexican hotel wire job.
One Klixon 20-amp 120-vac pushbutton breaker on rear.
Two integral 50 amp DC auto reset breakers inside
Buzzers wired across DC breakers to announce interruptions
(2) 10-turn 500 ohm Bourns metal/metal long life pots
one 100 count dial locks on pots
4,000 joule protection with multiple transient voltage suppressors 170V, 20 mm MOVS, 170 volt, and 3 -terminal Bourns gas discharge tube devices 180-volts
All but GDT protected with 2-amp pico fuses.
One liquid type silent high CFM fan to admit outside air.
6-hour Spring wound timer on rear which controls only one of the 2 Megawatt power supplies.
Voltage can be adjusted from 11.6 volts to 14.9 volts.
If I want higher voltage a 25-amp booster is available to boost output to sixty volts, and it has an incredibly fine amperage limiter built-in.
It's doesn't do 3-cell batteries, floors, or windows.
This was created for hobby fun. I didn't like what "The Market" offered, so I-rolled-my-own.
89 REPLIES 89

SCVJeff
Explorer
Explorer
NinerBikes wrote:
SCVJeff wrote:
NinerBikes wrote:
SCVJeff wrote:
Lemme help spend sum $$$
Looking Here

RU sourcing more than 20A ?

I have seen as much as 38 amps from this unit, at start up, though it quickly backs off to 33-30 amps. I already have an RC amp/watt/voltage meter in line.
Now ya got a fancy knob too

The fancy knobs post got deleted. But thank you for the new knob.
ooooh... Oooooh
I got it..
Jeff - WA6EQU
'06 Itasca Meridian 34H, CAT C7/350

MEXICOWANDERER
Explorer
Explorer
Seven of Seven? That would be criminal.

NinerBikes
Explorer
Explorer
SCVJeff wrote:
NinerBikes wrote:
SCVJeff wrote:
Lemme help spend sum $$$
Looking Here

RU sourcing more than 20A ?

I have seen as much as 38 amps from this unit, at start up, though it quickly backs off to 33-30 amps. I already have an RC amp/watt/voltage meter in line.
Now ya got a fancy knob too

The fancy knobs post got deleted. But thank you for the new knob.

SCVJeff
Explorer
Explorer
NinerBikes wrote:
SCVJeff wrote:
Lemme help spend sum $$$
Looking Here

RU sourcing more than 20A ?

I have seen as much as 38 amps from this unit, at start up, though it quickly backs off to 33-30 amps. I already have an RC amp/watt/voltage meter in line.
Now ya got a fancy knob too
Jeff - WA6EQU
'06 Itasca Meridian 34H, CAT C7/350

NinerBikes
Explorer
Explorer
SCVJeff wrote:
Lemme help spend sum $$$
Looking Here

RU sourcing more than 20A ?

I have seen as much as 38 amps from this unit, at start up, though it quickly backs off to 33-30 amps. I already have an RC amp/watt/voltage meter in line.

landyacht318
Explorer
Explorer

SCVJeff
Explorer
Explorer
Lemme help spend sum $$$
Looking Here

RU sourcing more than 20A ?
Jeff - WA6EQU
'06 Itasca Meridian 34H, CAT C7/350

NinerBikes
Explorer
Explorer
SCVJeff wrote:
I wouldn't worry about bumps on a 10T pot. If I saw one it would go into the trash simply cuz thats a problem looking for a place to start. Theres no reason to find a pot that just squeaks by, especially if you are tracking its output with a DVM. I have SOME 10T pots left, but dunno their size. Will a 2K sweep the range?


1k 10 turn pot more than sweeps the range,

If the 500 ohm pot I have gets me down to 13.4V, minimum then I am good. A 13.2v to 15.5 range is plenty. It's mainly to be used as a bulk charger, for quick and dirty bulk charging of a 158AH AGM Teleco battery I recently picked up, so 30 amps is well on the low side for this battery amperage wise, to not hurt or heat up anything.

Running the MegaWatt off a generator, first thing in the morning, to replenish the battery in bulk mode, on cloudy days. The solar panel will handle all the sunny days in bulk and top charge.

SCVJeff
Explorer
Explorer
I wouldn't worry about bumps on a 10T pot. If I saw one it would go into the trash simply cuz thats a problem looking for a place to start. Theres no reason to find a pot that just squeaks by, especially if you are tracking its output with a DVM. I have SOME 10T pots left, but dunno their size. Will a 2K sweep the range?
Jeff - WA6EQU
'06 Itasca Meridian 34H, CAT C7/350

MEXICOWANDERER
Explorer
Explorer
500 ohms will not allow the Mega to drop to 12.6 volts. Stop the music. I gotta run home and tell the Bournes pot it can't possibly do what it's doing. I use a cheapowatt for fixed voltage floating. No way am I going going to use a weightlifter to pass the salt. When using a generator the whole issue changes so I don't use the butler to do heavy lifting. Sorta like seeing your doctor specialist flipping burgers. Do-it-all means settling for mediocrity.

NinerBikes
Explorer
Explorer
landyacht318 wrote:
Everybody's specific requirements in their intended usage differ.

500 ohm pot might not allow you to go as low a voltage as your new telecom Deka specifies.

But getting wires to the circuit board in place of original Pot is hard part.

Substituting 1K ohm pot for 500 ohm pot afterwards is only money and a quick easy dab of solder.

If a cheapo 10 turn pot, hook dmm to it and watch as you spin dial. there could be weird spikes along that 3600 degree range.

Mine developed them.

Caig Deoxit f5 fader lube eliminated them, and freed my friend's guitar amps from crackling.


Is a Bourne 500 ohm 2 watt pot cheap in quality?

landyacht318
Explorer
Explorer
Everybody's specific requirements in their intended usage differ.

500 ohm pot might not allow you to go as low a voltage as your new telecom Deka specifies.

But getting wires to the circuit board in place of original Pot is hard part.

Substituting 1K ohm pot for 500 ohm pot afterwards is only money and a quick easy dab of solder.

If a cheapo 10 turn pot, hook dmm to it and watch as you spin dial. there could be weird spikes along that 3600 degree range.

Mine developed them.

Caig Deoxit f5 fader lube eliminated them, and freed my friend's guitar amps from crackling.

NinerBikes
Explorer
Explorer
landyacht318 wrote:
Original voltage range on my Meanwell rsp-500-15 with original 976ohm pot:
13.23 to 19.23v

Voltage range with 10 turn 1017ohm pot soldered in:
13.12 to 19.23v

More Ohms = lower voltage on both my cheapowatt( may it rest in smoky pieces) and Meanwell.

Pics indicate same value Pot was used on cheapowatt as Megawatt

Not sure I'd add a 500 ohm pot if power supply is ever intended for float voltages


Goal of MegaWatt is bulk voltage of 13.5 to 14.4V for an AGM battery. MegaWatt 30 is maxed at 15.56V with 0 ohms, and I've not checked how low it goes with the original pot, assuming 975 to 1025 ohms.

My battery generally sees a full recharge coming back from a camping trip once at home, and a full recharge right before leaving on a trip. In storage, it just sits. I might top it off once every month or two when not going on trips. Float is not an option with a Honda Eu2000i generator. It is with my solar panel set up.

If I pedestal camp (rare) the WFCO at 13.6V might end up floating, but I prefer dry camping /boondocking more for trips, for the solitude, and self sufficiency.

If original 1000 ohm pot is left in place, and the 500 ohm 10 turn is piggybacked on it, the little screw can be used for course range adjustments and the 500 ohm pot can be used for fine adjustments, correct?

landyacht318
Explorer
Explorer
Original voltage range on my Meanwell rsp-500-15 with original 976ohm pot:
13.23 to 19.23v

Voltage range with 10 turn 1017ohm pot soldered in:
13.12 to 19.23v

More Ohms = lower voltage on both my cheapowatt( may it rest in smoky pieces) and Meanwell.

Pics indicate same value Pot was used on cheapowatt as Megawatt

Not sure I'd add a 500 ohm pot if power supply is ever intended for float voltages