Which would be a better choice between the X2 700 and the Graupner ultra Duo plus 80 in term's of features and faster balance charging?
I had the previous version of the X2 and it was Slow in Balance charging lipos compared to other chargers.

Originally Posted by luis94

Which would be a better choice between the X2 700 and the Graupner ultra Duo plus 80 in term's of features and faster balance charging?
I had the previous version of the X2 and it was Slow in Balance charging lipos compared to other chargers.

I answered your question in the main X2 700 thread but I'll go into a little more detail here. The original X2 400 only had a 200mah current drain capability for balance charging. Little slow, but it got the job done. The X2 700 has 4x the balance discharging capability, a total of 800mah. In our testing we've found that it balance charged even severely unbalanced cells in relatively short order compared to the original so if you're looking to upgrade from the old reliable X2 400 then the X2 700 is definitely the way to do. Same user interface so it should be a no brainer for those already using the X2 400

Originally Posted by Xpress..

I answered your question in the main X2 700 thread but I'll go into a little more detail here. The original X2 400 only had a 200mah current drain capability for balance charging. Little slow, but it got the job done. The X2 700 has 4x the balance discharging capability, a total of 800mah. In our testing we've found that it balance charged even severely unbalanced cells in relatively short order compared to the original so if you're looking to upgrade from the old reliable X2 400 then the X2 700 is definitely the way to do. Same user interface so it should be a no brainer for those already using the X2 400

Thanks again for the info... That was the only issue that had me thinking ...but now that its been taken care of...i will definitely upgrade!!!

What is the maximum input current for this charger?

Originally Posted by bob93447

What is the maximum input current for this charger?

Can you elaborate on your question?

OK, here is the issue. The specs say that the charger will operate using an 11 to 30 volt input. They also say that the charger will output 1400 watts. I am pretty sure that it will not output 1400 watts at the input voltage of my charger, 13.5 volts. It would need to draw over 100 amps of input current to make that happen. So what is that maximum input current for this charger? I'm guessing about 50 amps, but I would like to be certain.

Technically it can operate at 1400w on 11v but like mentioned that's huge current draw (127 amps+). To be more economical, you will want to run it at 24v which will let you get the full output power with a 60 amp supply- to keep a ~10% headroom for the power the charger itself will draw, I'd recommend at least a 70 amp supply.

Keep in mind current is pulling, not pushing.

I tried loading it down this am. I set side one to charge a 5S battery (21v) at 16 amps. Side 2 would only charge a 4S battery (16.8 v) at 1.5 amps. Looks like there is about a 30 amp input limit for both sides when using a 13.5v input.

Make sure the power output settings in the charger are maxed out, they are set conservatively for those not using a big power supply. You can find the setting in the system set menu.

Xpress,

Thanks, but that doesn't seem to change things. I went into the power output settings; side one was factory set at 500w and I changed it to 700w; side two was factory set at 500w and I changed it to 700w. When I applied the load, essentially no change.

Side one was set to charge 5s at 20 amps and it actually charged at 16.9 amps at 19.37v.

Side two was set to charge 4s at 10 amps and it was operating at .5amps at 15.58v.

The dc power supply is rated at >60amps. It was holding steady at 15.57 volts during the above charge.

Are there any other input setting I should be changing or does the charger require higher voltage to get to the higher power settings?

Bob

Xpress,

I found the screen to set the input limits for the power supply, which was set at 30 amps. Changing that screen to 54 amps on side one allowed me to charge side one at 5s but was limited to 17 amps. Side two power input went from 4s at .5amps to 4s at 10.5 amps.

Question -- Side one is the had the screen to change the input limits for the power supply. Side two does not have a comparable screen?

Question -- What is the maximum input current for the 2x700?

Thanks for your help!

Bob

Try pushing your supply to 24v then, if capable.

Current is a figure of pull, not push as I mentioned before. You cannot push current to the charger, the charger can only pull current.