Alternatively get a dc-dc converter from ebay and use that as the front
end. Your existing charger is the input and then set the output current
and voltage to match the battery pack.
Used that to charge a 72volt pack from a 48v charger.
Steve
On 18/03/2019 06:20, EVDL Administrator via EV wrote:
On 17 Mar 2019 at 16:39, ken via EV wrote:
I like to see some kind of a charger timer that could control the input
to the charger as on/off
This is pretty much what a cycle dropping charge controller does. It's a
relatively simple (crude) method.
The charger is designed to produce a voltage higher than the battery's fully
charged (on charge) voltage. The controller monitors the voltage, and shuts
off the charger when it rises above some threshold (typically 2.35 to 2.45
volts per cell). With the charger off, the battery voltage then falls until
it crosses some lower threshold (hysteresis), and the charger turns on
again. This cycle repeats, usually for hours. As the battery works its way
through its absorption phase, gradually the on time becomes shorter and the
off time longer. This effectively tapers the average current as the battery
reaches full.
Normally the switching is done at the charger output, but I've seen one
oddball charger where the charger INPUT (tansformer primary) was switched on
and off.
David Roden - Akron, Ohio, USA
EVDL Administrator
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