QUESTIONS re: MEGA-WATT 33-AMP POWER SUPPLY
This critter can be found on eBay. It is a switching type power supply. Supposed to have an ultimate amperage potential of 33, voltage adjustment of 10, to 15, and work fine as a long term battery ...
Forum Discussion
This is the link to the actual seller rather than to their eBay posting
http://www.12voltpowersupplies.us/
The vendor simply stated "No You Cannot Use Them In Parallel They Will Burn Out"
I wish to learn *why^ these PWM controlled power supplies are somehow different than a cheap "solid state" battery charger. If they cannot somehow "handle" being paralleled, then is it a problem with modulation frequencies conflict? Ringing? Is it a problem of capacitance? Then that would preclude connecting even one charger to an electrolytic cap to further suppress ripple when used as a power supply.
The vendor does have an apparent dog in the fight. Larger size chargers, costing quite a bit more. Could it be, the vendor is just offering an off-the-wall excuse to prevent stacking of the smaller power supplies and hurting larger sizes of chargers sales?
I do have to admit the reasons for me wishing to purchase this form of charger are obtuse. Using tiered voltage settings and cute multi-turn pots with knobs, I can do anything I want within reason.
I travel a lot down here. I carry a battery for BiPAP use. When power goes off it can stay off. It may return for an hour or so, then stop for another two or three days. The size battery I carry accepts 48 amperes at 14.5 volts at maximum acceptance. Standard "smart chargers" do not stand a prayer of being in the same "time charging" league as would a pair of these chargers set to 14.5 volts. But I do not want to be limited to a 14.5 volt protocol. With a pot, I can set these critters from 10 - 15 volts. Coupled with a boost or buck high wattage module, I have a very lightweight power supply. I am terrified at the thought of lugging around my bench-top power supply.
Now couple the above to a 12-hour spring wound timer and the result is a 4 pound 66 amp power supply, capable of .5 to 78 volts (limited power outside the charger's span of course) with a timer, and it is something that I can stuff in a lunch box and pack in the toad.
This certainly is not something I would recommend for someone else.
But it all falls flat on its face if those 2 33-amp units cannot be paralleled. I have no use for a single much larger capacity power supply.
http://www.12voltpowersupplies.us/
The vendor simply stated "No You Cannot Use Them In Parallel They Will Burn Out"
I wish to learn *why^ these PWM controlled power supplies are somehow different than a cheap "solid state" battery charger. If they cannot somehow "handle" being paralleled, then is it a problem with modulation frequencies conflict? Ringing? Is it a problem of capacitance? Then that would preclude connecting even one charger to an electrolytic cap to further suppress ripple when used as a power supply.
The vendor does have an apparent dog in the fight. Larger size chargers, costing quite a bit more. Could it be, the vendor is just offering an off-the-wall excuse to prevent stacking of the smaller power supplies and hurting larger sizes of chargers sales?
I do have to admit the reasons for me wishing to purchase this form of charger are obtuse. Using tiered voltage settings and cute multi-turn pots with knobs, I can do anything I want within reason.
I travel a lot down here. I carry a battery for BiPAP use. When power goes off it can stay off. It may return for an hour or so, then stop for another two or three days. The size battery I carry accepts 48 amperes at 14.5 volts at maximum acceptance. Standard "smart chargers" do not stand a prayer of being in the same "time charging" league as would a pair of these chargers set to 14.5 volts. But I do not want to be limited to a 14.5 volt protocol. With a pot, I can set these critters from 10 - 15 volts. Coupled with a boost or buck high wattage module, I have a very lightweight power supply. I am terrified at the thought of lugging around my bench-top power supply.
Now couple the above to a 12-hour spring wound timer and the result is a 4 pound 66 amp power supply, capable of .5 to 78 volts (limited power outside the charger's span of course) with a timer, and it is something that I can stuff in a lunch box and pack in the toad.
This certainly is not something I would recommend for someone else.
But it all falls flat on its face if those 2 33-amp units cannot be paralleled. I have no use for a single much larger capacity power supply.
