Doctorbass
100 GW
I am tired of parallel charging 2 x 12s .. that make alot of aditional connections and contact resistance.
A great cheap and easy solution i was thinking about for long time and finally decided to test is teh use of a 1:1 ratio DC-DC converter.
Teh idea is to connect the output of a 48V dc-dc in serie with his input to double the voltage. Tmost of the dc-dc have an isolated output vs input.. SO YOU CAN connect the output with the input!
Few dc-dc that take 48V input have variety of output from 3.3V to 48V. by connecting a dc-dc with a 48V in and 48V out you can get 96V out.. and play with teh trim pot to rise the total output to teh desired voltage around 100.8V is you need for 24s lipo... 8)
For sure the total power output will decrease a bit and you might loose aroud 7-8% total power due to the efficiency of the dc-dc that is around 90%.. but it's just for half the voltage ( the 50% that represent 48V out of 96 of the dc-dc output)..
Let say you bought a 48V 10A ( 500W) meanwell psu. by connecting the 48-48v dc dc with it you will get around 100V at 4.5 to 5A out... for around 450W..
but.. you will be able to keep your pack connected in 24s!.. no more need additional serie parallel connection for 2 x 12s !!
I will test that and comeback with review once i'll get the dc-dc arrived from ebay.
DC-DC are great cause you can accehive the dedired voltage from any lower psu by connecting their output in serie to the input!
I already did that to convert my 1500W meanwell 48V to a 66Vout for my friend bruno for chargin his battery with two BXB150 48vin 5v out in serie to acheive +10V to the output. ( the 48V meanwell can do up to 56V out.. so 56+10=66V
If you search on ebay you wil lfind CHEAP dc-dc.. not the one you see at 75-100$ but most around 25-30$ each.
That is a good solution for compact size charger. and for those who dont want to have to buy another psu connected in serie with the first!
I found some that output 250W out for 20$ !
Doc
A great cheap and easy solution i was thinking about for long time and finally decided to test is teh use of a 1:1 ratio DC-DC converter.
Teh idea is to connect the output of a 48V dc-dc in serie with his input to double the voltage. Tmost of the dc-dc have an isolated output vs input.. SO YOU CAN connect the output with the input!
Few dc-dc that take 48V input have variety of output from 3.3V to 48V. by connecting a dc-dc with a 48V in and 48V out you can get 96V out.. and play with teh trim pot to rise the total output to teh desired voltage around 100.8V is you need for 24s lipo... 8)
For sure the total power output will decrease a bit and you might loose aroud 7-8% total power due to the efficiency of the dc-dc that is around 90%.. but it's just for half the voltage ( the 50% that represent 48V out of 96 of the dc-dc output)..
Let say you bought a 48V 10A ( 500W) meanwell psu. by connecting the 48-48v dc dc with it you will get around 100V at 4.5 to 5A out... for around 450W..
but.. you will be able to keep your pack connected in 24s!.. no more need additional serie parallel connection for 2 x 12s !!
I will test that and comeback with review once i'll get the dc-dc arrived from ebay.
DC-DC are great cause you can accehive the dedired voltage from any lower psu by connecting their output in serie to the input!
I already did that to convert my 1500W meanwell 48V to a 66Vout for my friend bruno for chargin his battery with two BXB150 48vin 5v out in serie to acheive +10V to the output. ( the 48V meanwell can do up to 56V out.. so 56+10=66V
If you search on ebay you wil lfind CHEAP dc-dc.. not the one you see at 75-100$ but most around 25-30$ each.
That is a good solution for compact size charger. and for those who dont want to have to buy another psu connected in serie with the first!
I found some that output 250W out for 20$ !
Doc