serious_sam said:
DogDipstick said:
I use a "Hawkeye 808" to monitor the input current and stop the charge at undercurrent ( of the line) or overcurrent ( of the line). Trips a relay disconnection at a certain mA adjustable.
Does it work for DC ? The datasheet doesn't say. Seems to imply AC (since it is line powered by induction).
Yes it is passively powered by induction of the AC input.
( I use it on the 110/220v AC line from the wall... ) ( the current/power that the power supplies push( in amps) is/are pulled, and this AC current is what I am monitoring, and using to trip @ the desired termination current.... the AC imput current into the supplies, not the dc current from the supplies. This assures me that under any condition.. if the power supplies go dead and the relays still have voltage.. the relay is tripped, diconnecting the pack fromits dc input... the trip signal is adjustable for the lower end.. ie, you can set it to trip when the current is under (x) amps... So the ( dc side ) pack reaches ( termination ) voltage ( max V. that the supplies are set at) the current being provided by the supplies also derops ( current from the wall) ( the ac crossing current) and I use this to trip a DC rated relay and disconnect the pack.
I have it set to terminate the charge when the current from the wall reaches about a 1 amp threshold... Running I pull a good 8-12 amps, depending on SOC..... then the pack fills, reaches ~ set voltage, and the DC disconnect relay trips ( and stays tripped, for the AC side of the power supply must take/move/pull power( the current) to " untrip" and the pack has reaches the ( set chosen) termination voltage. ( I have an override switch for a momentary action that begins the charge for this action at the beginning of a charge. ) ( another benefit is I never get sparks ( cause the main disconnect is handled by rated relays.. )
Yeah? Well, it works well.
It will also trip the relay if for any reason there is to much current on the AC side comming from the wall... ( short, anywhere downstream.. )
It works. People have asked for the exact schematic ( the relay ladder and whatnot.. ) . Im lazy so I havnt drawn one up.