rgreen24

My Feedback: (6)

Anyone out there using this combination able to charge your 2 batts at 2c? Every time I do I get a low supply reading, but charges fine @ 1C

Thanks in advance

g_mkoch

The Iota 55 is a 750W power supply.
Charging a 10s 5000mah battery at 1C requires roughly 200w, charging at 2C would make it 400W; 2 batteries at 2C would equate to about 800W not taking into account charger ineficiencies

rgreen24

My Feedback: (6)

Thanks. look like I need to get another power supply or set the c rating to 1.5c

Chris Moon

My Feedback: (8)

Robert make sure the Cellpro is set to the lowest input warning threshold, I think it's 10V but it has been a while since I changed mine. Also make sure when you are drawing that much current that the charger goes right into the Iota as losses from wires and connectors become critical to voltage dropping if the wires or connectors are undersized.

OhD

Which Cell Pro charger? How many cells? What capacity cells?

Jim O

rgreen24

My Feedback: (6)

Cell Pro 10S charger and Thunder Power 10S G6 prolites 5000 MAH

OhD

I believe you will find that a better power supply will not solve your problem. The Cell Pro 10S is Rated at 225 Watts output with 13.8 volts in. That would mean the charge current couldn't be over 6 Amps at 38 volts, even less at 40 and 42. I run one of my chargers at 5.2 amps and the other at 5 and live with the time it takes to charge and I don't see a big difference in charge time between the two. If I ever upgrade I will look at a 24 volt power supply and a 24 volt charger with greater capability. I don't know why someone doesn't make a 110AC charger as most of us have generators or charge at home. It could be less expensive as it wouldn't need a DC to DC converter.

Jim O

rgreen24

My Feedback: (6)

Jim, I think you just found your next project

cmoulder

The voice of experience.[sm=thumbup.gif]

I had two Cellpro 10S units (still have one, though not using it) and found that at 13.8 volts on the PS end (75 amp PowerMax) you still can ram only so many amps through it before it starts getting pretty hot. One of the units showed a gradual loss of performance over time and had to be sent to FMA for a $60 refurb. Then the other started showing a similar trend. I am no electronics whiz by any stretch of the imagination and don't know what is going on with which parts of the innards, but it is clear to me that, over time, electronic things that run hot will eventually degrade in performance before failing altogether.

It should be mentioned that I mainly charge 10S 5A Lipos (2x5S in series, actually) for pattern planes. I also charge 5S 5A Lipos separately for the smaller Osiris, but as I understand it the charger "sees" them as a series.

So now I have two 10XP's and a 24-volt Meanwell 40A PS. I charge everything at 1C (or 5A) and nothing gets hot - barely warm in fact - and I'm hoping that this setup will last a long time. At my normal discharge levels, recharge takes about 40 minutes to 1 hr.

Yes, a straight-up 110vAC charger would be welcome. I am all wall plug or Honda generator for main power source these days, as more and more guys are with the strong trend toward electric.

nonstoprc

My Feedback: (90)

10s allows the charge current to be set at 5A, 5.1A, 5.2A, ... 9.9A, 10A, 1c, 2c or 3c. Assume your packs are rated at 5000mah, you may be able to charge the 2 batts at somewhere between 1c and 2c without getting a warning.

woodie

As Jim pointed out in post #7 of this thread, the limit you will run into with a Cellpro 10S is the max output watts. With 2 5S 5000 or 1 10S 5000 mah pack, you are pretty well maxed out at 1C or 5A since this is close the the 225watt output limit. The CellPro 10XP almost triples the max watt output if your input voltage from your power supply is high enough.

Woodie

nonstoprc

My Feedback: (90)

From the 10s manual, the output power of 10s is maxed at 260w: "Up to 10A charge current (318W continuous input and 260W continuous output at 15.7V input)."

So the max charge current = 260w / 42v = 6.1A.

woodie

Yeah, that's true at 15.7V input but most people have about 13.8-14V input capability unless you buy a special power supply or series multiple power supplies to get to the 15+V.

We are at a bit of a turning point in our electric charging setups. With the newer batteries you can charge at higher than 1C rates with little to damage over the long term which means we can carry fewer batteries to the field with us to practice. However, to take advantage of the higher charge rates you need a charger capable of delivering the increased watts, etc. My guess is we will continue to move toward higher charge rates and fewer batteries and see the standard charging setup shift toward higher voltage inputs to the charger.

It is interesting to look at the changes that have happened in the past 5 years to lipo batteries, chargers, power supplies, battery life, discharge capabilities. An average battery today is FAR better than the top of the line batteries I used 5 years ago. It will be very interesting to see what happens over the next five years.

Woodie

cmoulder

While possible, trust me, you don't want to push it that hard.[]

nonstoprc

My Feedback: (90)

Not max it out at 6.19A, but perhaps at 6.0A :-)

My AD converters are rated at 380w per unit. Voltage output is adjustable. So there is a little bit of flexibility.

I never own an iota unit and wonder its max DC output voltage.

cmoulder

I had an Iota 55-amp PS and it held voltage around 13.7 to 13.9v with 2 chargers going at 2C.

However it didn't have quite enough output for 2 chargers so one of the chargers would occasionally trip.