Meanwell HLG charger on a timer

[transposon]

I use a Meanwell HLG-480H-54A as a charger for my 52V battery. It works great, but I would like the option to put it on a timer so that it turns on ~4 hours from my morning commute. I'd like to connect the battery to the charger and put the charger on a timer. Is there any risk of the battery discharging while being connected to the meanwell while the meanwell is unpowered overnight?

 

[dominik h]

I have two meanwell ELG240-42 in series permanently installed in my scooter, as an adjustable "slow" charger for my scooter.
They are always connected to the battery.
I shure have a big 21S100AH battery , but during 3 weeks of holidays I see no resonable voltage drop.

 

[DogDipstick]

Is there any risk of the battery discharging while being connected to the meanwell while the meanwell is unpowered overnight?

Not much chance, they have diodes to prevent any backflow.. but.. there is always a possibility of a fluke.

The timer should cut all input power current path to the meanwell ( from the wall) then its just a unpowered
meanwell hooked up to a battery ( no prob).

 

[amberwolf]

If your MW is like my HLG-600H-54A's, the LED indicating output is active is powered from the output-wire side of whatever the output stage is. So this LED is always on as long as there is sufficient voltage on the output wire, whether that is from your battery or from the charger itself. It's not much drain, but it's there.

I don't have a 400 series, so don't know if htey have an LED or how it behaves.

The 150(?) series 12v MW I do have doesnt' have an LED, but I can hear a click inside it when powered on, so it probably has a relay (like the Satiator does) that disconnects the output from the internals when not powered by the wall.

The 600H does not click so there isn't any relay there, almost certainly.

Note that the HLG series is intended to power LEDs, not charge batteries, so there isn't any real reason they should use diodes or relays or anything else to isolate the output when unpowered...so if they do on any specific model, it's a bonus.

For my SB Cruiser trike, the MW is permanently mounted and wired to the controller side of the battery current measuring shunt (so I can measure recharged capacity, etc., when needed). There is a battery disconnect switch between that point and the battery itself, which I use whenever not riding the trike, so it doesn't drain the battery via the CA, the MW LED/etc, or the controllers.