Adjustable power supply

[JTAnimal]

I just go my first adjustable power supply. I bought one of the E-Fuel 1200 wat 50 amp 30v and I use a I charger 306. So the instructions for this unit was useless but they always are. Can someone with some experience give me some advise on volts and amp I should go for. Mostly I charge 6 cell batteries 5000 mah or 2 - 6 cell packs for my goblin 700 and Trex 600 both are 12s setups.

Just looking for what voltage would be optimum. Or a link to a guideline I could read.

Thanks for the help..

[RedOctobyr]

Ideally, you want to keep your input voltage at least a few volts higher than the max output voltage that will go to your packs. Do some reading on "buck boost transition" if you want to find out more

You're charging 6S, which is a max of 25.2V. Your PS goes up to 30V, and the 306B can take up to 38V. So you don't need to worry about damaging the charger with too much voltage.

The higher your input voltage, the fewer amps are required. Which helps keep wires and the charger cooler.

If it were me, I'd probably set it to 28V. A little below the supply's max output, but several volts above the 25.2V you'll be putting into your packs. Which should keep you above the buck/boost transition.

I am running my PS at 28.5V for my 308Duo, which maxes out at 30V. I charge up to 6S. My supply adjusts up to 28.8V.

[JTAnimal]

That's on the line of what I have been doing. Thanks

[flipnap]

this thread is EXACTLY what i was looking for. the OP is carbon copy of my question.. thanks so much guys! LOVE THIS PLACE!!!!!

[RedOctobyr]

Recently, FMA (the PowerLab people) released a warning about the E-Fuel 1200W 50A supplies, model SK-200015.

If that's your supply, I would follow their advice for startup/shutdown. It sounds like this particular supply might have a "bug"/design flaw.

https://www.helifreak.com/showthread.php?t=647337

PowerLabs have been damaged by these supplies. They can take up to 32V, vs 38V for the 306B. But I don't know how big this apparent voltage spike is, during powerup. It might be over 38V.

Sent using Tapatalk.

[flipnap]

guys, i actually do have another question about the i380 charger. Whats the fastest rate i can DISCHARGE a 6s lipo (pulse 5500).

And one more, while i use this to charge my 3s lips, can i still leave the power supply voltage at the same setting as for my 6s? i mean you don't need to adjust the power input all the time right? thats why we set the C rate on the charger. I just don't want to charge a 2C rate on a 3s lips at 24 volts if its gonna blow up..

thanks much

[RedOctobyr]

It will do an 80W discharge on one channel. Up to 120W total.

80W is a little over 3A on 6S. If you discharged 2 packs at once (one on each channel), or made/bought cables to combine the outputs of both channels (Sync mode), 120W would give a little under 5A total.

You can also build an external resistive load for discharging from one channel into resistors/bulbs on the other channel. This can give up to 650W if built properly, which is 26A on 6S.

No need to change power supply voltages if charging 3S instead of 6S.

Sent using Tapatalk.

[flipnap]

awesome, thats exactly what i needed. thanks much

[FlightAddict]

Originally Posted by JTAnimal

I just go my first adjustable power supply. I bought one of the E-Fuel 1200 wat 50 amp 30v and I use a I charger 306. So the instructions for this unit was useless but they always are. Can someone with some experience give me some advise on volts and amp I should go for. Mostly I charge 6 cell batteries 5000 mah or 2 - 6 cell packs for my goblin 700 and Trex 600 both are 12s setups.

Just looking for what voltage would be optimum. Or a link to a guideline I could read.

Thanks for the help..

Your power supply can only output 28v max per the spec. Your 306 max input is way above that. You can set your charger to charge 1c. Example: if you are charging 5000 mA 6-cell lipo, set your charger to 6-cell lipo 5000 mA or 5 amps.

If you want to charge your 6-cell 5000 mA lipo to 2C, then set your charger to 6-cell lipo, 10000 mA or 10 amps.

I hope i understood your question correctly.

[JTAnimal]

Originally Posted by RedOctobyr

Recently, FMA (the PowerLab people) released a warning about the E-Fuel 1200W 50A supplies, model SK-200015.

If that's your supply, I would follow their advice for startup/shutdown. It sounds like this particular supply might have a "bug"/design flaw.

https://www.helifreak.com/showthread.php?t=647337

PowerLabs have been damaged by these supplies. They can take up to 32V, vs 38V for the 306B. But I don't know how big this apparent voltage spike is, during powerup. It might be over 38V.

Sent using Tapatalk.

I think that is an old unit, my model number is way different. Thanks anyway..

[JTAnimal]

Originally Posted by FlightAddict

Your power supply can only output 28v max per the spec. Your 306 max input is way above that. You can set your charger to charge 1c. Example: if you are charging 5000 mA 6-cell lipo, set your charger to 6-cell lipo 5000 mA or 5 amps.

If you want to charge your 6-cell 5000 mA lipo to 2C, then set your charger to 6-cell lipo, 10000 mA or 10 amps.

I hope i understood your question correctly.

No, I was just looking for how high I can run up the power supply.. Not the charger. But the question has been answered and is working great for me. This is a nice power supply. I am spending a lot less time charging and more time flying.