Hi folks,
I am using an inverter-based welder as a battery charger. I have control of the output so can control the current and thus the charging voltage of my AGM cells but I am concerned about ac ripple on the pack which is at about 17KHz
The 400AH pack needs to be current limited until it reaches sufficient terminal voltage to manage its own float charge after that I am controlling the output of the welder to maintain an acceptable float voltage.
My question to twofold .
How much ripple is acceptable?
Without any modification the ripple at 55A was about 800mV, I added a choke that I made from an 80mm torriod core with 20 turns of 6mm tri-rated on it. This reduced the ripple to 300mV but also got quite warm in the process.
Will doubling the sqr area of the wire and doubling the number of turns, which would be stacked and therefore further from the core, give me half the ripple and reduce the heat disipated.
I will happily buy some heavy enamel wire but dont want to spend money on something that isnt going to work..
Any and all input will be gratefully accepted.
Alistair
I am using an inverter-based welder as a battery charger. I have control of the output so can control the current and thus the charging voltage of my AGM cells but I am concerned about ac ripple on the pack which is at about 17KHz
The 400AH pack needs to be current limited until it reaches sufficient terminal voltage to manage its own float charge after that I am controlling the output of the welder to maintain an acceptable float voltage.
My question to twofold .
How much ripple is acceptable?
Without any modification the ripple at 55A was about 800mV, I added a choke that I made from an 80mm torriod core with 20 turns of 6mm tri-rated on it. This reduced the ripple to 300mV but also got quite warm in the process.
Will doubling the sqr area of the wire and doubling the number of turns, which would be stacked and therefore further from the core, give me half the ripple and reduce the heat disipated.
I will happily buy some heavy enamel wire but dont want to spend money on something that isnt going to work..
Any and all input will be gratefully accepted.
Alistair