Hi. I have a couple questions on my Hyperion eoso 720i net3 charger.

Question 1. I cant seem to get the charger to charge past 15 amps requardless of what c i have it set for, even using a good power supply.

Question 2. What king of ir numbers are you guys seeing for your 2s lipos?
Just wondering what a good pack should read.

Any help would be appreciated. Thanks

How many C does the 720i charge at?

My 615i will charge at a max of 3 C. If I set my mah setting at say 4000, mine won't go above 12 amps. To get my 615i to charge my 4000mah packs at 15amps I need to put the mah setting to at least 5000. You follow the math?

The 720i will charge at up to 6c charge rate. Even with my 6500mah SMC's,
With it set at 6c, it will still only charger at 15 amps. Would increasing the mah
to 7500 help? thanks

Do you have this one..

http://www.amainhobbies.com/rc-cars-...720iad/p183294

Or do you have the Duo?

http://www.amainhobbies.com/rc-cars-...20isd3/p197393

I have the single port charger.

Hard to say. You are limited to 150w max output though, even on DC power.

Volts X amps = Watts

8.4v x 15 amps = 126 watts

Assuming some power loss from efficiency, or lack of, 15 amps is about all you're really going to get.

Assuming 100% efficiency, a 2s 8.4v pack would be maxing the chargers rated output charging at 17.85amps

8.4v X 17.85amps = 149.94watts

But there's always going to be some power loss.

Is your power supply is a 12 Volt unit? If I remember correctly that charger needs a 13.5V or higher power supply to achieve the full 150 Watt output rating on DC. Max of 15V. Common limitation for chargers as the power goes up. I can confirm later.

Yeah. Im using a Juice box 75a 12v. So allittle over 15 amps is all im gonna get out of it?
Anybody have any 2s lipo ir numbers?

Thanks for all the help guys.

Pretty much yes. The charger is designed to work with traditional bench power supplies on DC. Which are typically in the 13.8V range to mimic a typical auto battery. 12V server supplies are a little low for many chargers to achieve full power. Way too low for even higher powered chargers, why some now use 24V supplies. I confirmed that Hyperion states above 13.5V input for full power, 15V max. Table at the bottom of the first page.

IR, general numbers, hard to be exact: 2 to 3mΩ per cell is good. 1mΩ or lower per cell is awesome (likely requires some conditioning). Approaching 5mΩ and up is still useable for classes other than very competitive stock and perhaps 4x4 short course. Big caveat, IR varies by temperature, charge state, and the actual device being used to measure. Despite the caveats it's a great tool to help keep track of general pack health. Just try to be as consistent as practical with the measurement method and conditions.

A lot of good stuff here, but efficiency applies to the power supply needed. The charger power ratings are output ratings, given a sufficient voltage and power supply the charger will put out 150W to the RC pack. Where efficiency comes in is more than 150W of power supply would be needed. Would need somewhere around 180W give or take of power supply power to achieve the 150W of charge power. Again with the proper voltage too.

Thanks. I was just trying to use the ir numbers as a way to compare my packs. I have a few SMC packs that are in the 2-3 range, and a few of my spec packs in the same range.
Now i have to look for a better power supply, i guess.
Lol. Thanks again for the help.

One more quick question. What should i set my storage TVC % at?
Ive been using 60% now. Thanks

%, I'm guessing you mean TCS / Terminal Capacity Selection, not TVC / final voltage? Most lipo manufacturers recommend somewhere around 40-60% of capacity, or about 3.8 to 3.85V per cell resting voltage for storage. I've experimented with using TCS for storage, tried different levels. But went back to just using the storage function. I wasn't able to see a difference I could confidently rely on and it didn't seem worth remembering to change the TCS value. Best I can tell most anywhere in the middle of capacity is better than either near to fully charged or near to fully discharged for storage.

Where I do use TCS is for charging, I usually only charge to 90%. Saves a lot of the time finishing the charge as the amps drop off, and relatively little run time is lost. Better ratio of fun time to charge time. And it's a touch easier on the batteries. I would use 100% if running a stock class or an unusually long main where I was concerned about run time.

Yeah. I meant TCS, sorry. Thanks for the help..