Paralleling Power Supply Units Made Easy ???
I am considering paralleling a couple of 20a variable adjustable psu's for 40a charging. According to what I have read on the world wide inter-web, it can be done quite easily, provided the following ...
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I don't understand the OP why it has to be so complicated. I use multiple chargers all the time and the chargers are not exactly the same for voltage.
It does work best when all the chargers have the same voltage but "perfection is the enemy of good enough."
They all add their full amps until the battery voltage rises enough that the lowest voltage one doesn't have enough "spread" between its voltage and battery voltage to do its rated max current anymore, so that one's amps start to taper. But it still adds those tapering amps until battery voltage reaches that charger's voltage.
If the chargers are all set to voltages near where you want Vabs to be, then the main bulk charge is mostly with all doing near full amps.
Good enough. Amps will taper when Vabs is reached anyway, so who cares about a few minutes in there when you get fewer amps from some chargers before reaching Vabs? Big deal.
You wouldn't try to run a 13.6 with a 14.4 in hopes they will add their amps more than a minute, but you can run a 14.4 with a 14.6 and a 14.8 just fine.
If all the chargers have adjustable set points, then just twiddle to get them near the same voltage and that will get it done.
Once the battery acceptance rate has fallen so that you have too many chargers on the job, you can leave them all on and they will each do some of the amps or you can yank a charger and put it away if you want when the total max amps of the remaining chargers is enough to meet that falling acceptance rate.
It does work best when all the chargers have the same voltage but "perfection is the enemy of good enough."
They all add their full amps until the battery voltage rises enough that the lowest voltage one doesn't have enough "spread" between its voltage and battery voltage to do its rated max current anymore, so that one's amps start to taper. But it still adds those tapering amps until battery voltage reaches that charger's voltage.
If the chargers are all set to voltages near where you want Vabs to be, then the main bulk charge is mostly with all doing near full amps.
Good enough. Amps will taper when Vabs is reached anyway, so who cares about a few minutes in there when you get fewer amps from some chargers before reaching Vabs? Big deal.
You wouldn't try to run a 13.6 with a 14.4 in hopes they will add their amps more than a minute, but you can run a 14.4 with a 14.6 and a 14.8 just fine.
If all the chargers have adjustable set points, then just twiddle to get them near the same voltage and that will get it done.
Once the battery acceptance rate has fallen so that you have too many chargers on the job, you can leave them all on and they will each do some of the amps or you can yank a charger and put it away if you want when the total max amps of the remaining chargers is enough to meet that falling acceptance rate.
