Woah... that's a
lot of power. I'm going to have to make an extended response, sorry
Also: I don't know what 'BMS' is. A charge balancing system?
Practicality(I'm assuming charging methods for LiPo ~= Li-ion here. Please correct me if I am wrong)
Li-ion batteries require constant current charging for most of their charging process -- constant voltage is only done at the end to eke out a few more % (
^wiki ^batuni). Constant voltage charging the batteries will either shove way too much current through them initially (destroying your charger and/or batteries with copious fireworks) or not charge them enough unless you slowly & manually raise the voltage.
IE you are better off using or designing (we prefer the latter around here
) something that regulates current and voltage for you, else you will have to sit by the batteries for hours with two multimeters (one measuring current, the other voltage) manually tweaking the PSU output on the batteries. I have done this before -- but for lead-acids, NOT lithium chemistry -- and although good for meditation, you don't want to do it often, nor on more dangerous chemistries such as the Li* family.
You are also going to need to supply the boost converter with power. Getting your 48v PSU or a 1.5K to 2KW computer PSU will be well into hundreds of dollars. Depending on your country, you may not be able to power this rig off normal wall sockets.
Finally putting power supplies in parallel is not as easy as you think -- unless they all have the same output voltage, or a constant load, the slightly higher V ones will try and drive the other chargers. Generally they don't like this, and they shut off. Your best bet would be to unify them all to run off one piece of boost controlling circuitry, but this would take a lot of time, testing and reverse-engineering. Don't trust promises by DX, you
might be lucky and they have functionality to aid being put in parallel, but don't rely on it to be there if you are not certain.
Safety1500 watts = 1.5Kj per sec = 358.5 calories per sec (water heat constant = 4.184)
Average lab mouse = 35g (
^yahoo answers)
Degrees C rise needed to take a mouse from room (25C) to boiling = 75C
Time needed to turn a mouse into vapour with this power (assuming 100% water) = 75( 35 / 358.5 ) = 7.32 seconds
Regardless of the fact you are definitely not a mouse (me, on the other hand...) 1.5kW is not something to toy with without either current limiting or with lower power tests first. I have not the foggiest if your batteries can even charge at this rate -- what is their max charging 'C' (not celcius, in amps)? If they can't, they will overheat and catch fire/explode.
RecommendationsI'm not an EE, just a hobbyist. Get what I write here confirmed by other people before taking it for anything resembling objective facts. No warranty of any kind, etc
(1) Find out the max C (current) charge rate of your batteries. You cannot go past this per cell -- else they will damage themselves and then possibly damage you.
(2) Look at your current charger. Is it already charging them near/at their max C already? In that case, there is not much you can do.
(3) Consider designing your own charging regulation circuit or obtaining one. Controlling battery charging manually is silly, for safety and sanity.
(4) If you want to go down this route, buy only
one of the boost converters and try with just that. It will still deliver you tsunamis of power.
Neither the stats on the DX boost PSU nor your original charger will probably by true FYI -- expect them to be 10% to 50% overstated on what they actually deliver. Welcome to the world of power supplies!
Sorry for being so morbid! Welcome to EEVforums, join us in the discussions!
Regards, Hales