|
ramboman -> RE: A123 charger (4/24/2007 4:51:10 PM)
|
There is a big gap between theory and real life.
I charge my sealed lead battery at 13.6V on my "home" power unit.
When fully charged and disconnected from the power unit, voltage drops to 12.6V.
3 time that makes 37.8V, not critical at all for a 10s pack (that accept for a short period 4.2V per cell)
More, voltage is not defined by the lead batteries, but by the a123 pack under charge
this is 36V, no more, until the end of the CC phase (80%)
Difference is due to cable and internal resistance (ohm rule)
Current drops to zero when both batteries (lead and a123) are level.
Just test it, looking at the wattmeter: it works exactly like that.
Adapt the lenght of the cable to stabilize the current around 20A (10s2p pack)
during the first 12 min and stop manually (if you are afraid) when a123 voltage
raises above 3.7V (for example).
I charge 2 packs together at 40A, there is no alternative on the market today.
Sorry, there is one: a generator and a CCCV power unit (Tanic) set to 20A 36V.
It works perfectly following a123 specifications. That's what I use at home, without the generator
and set to 12A 36V for a low speed charge (3A 3.6V per cell) of both 10s2p packs.
|
|
|
|
