I’d like to recommend you our charger AK840. It is the latest high performance touch screen charger.

High power :With the 1000W power ,you can enjoy the pleasant sensation of fast charging .

Cooling fans: the two large cooling fans and fully aluminium alloy material help to reduce the operating temperature and to get rid of the heat.

Mini USB slot: the mini USB slot is used to connect with PC to upgrade the firmware, so the charger can always keep updated.

Included rich accessories, you can use easily:Included is Alligator and XT60-Deans male . Also included is the balancing board which is equipped with HP, XH, TP and EH style ports to make sure you are able to connect virtually every 2S to 8S LiXX battery pack out there.

Charging Status Monitor：When the charger is working, the users could check the information of charging capacity, charging current, cell voltage, resistance, peak temperature, input voltage, end voltage, internal temperature ,safety timer and cut-off capacity easily. What's more, it can also display the voltage in a graphic which helps the user monitor the charging status all the time.

“Set up” menu : as the following picture, you can set up the precharge time, temperature mode, cut-off temperature, cut-off input voltage, safety timer, back light, melody, button sound, buzzer sound, user name setting and factory reset. So it’s very convenient for user to operate.

Digital power program :It can provide an output power of DC3.0V-36.0V for the other electronic equipment. if you don’t have power supply at hand, you can use the charger reasonably.

Store Mode: Built-in advanced lithium battery save function, this is to charge or diacharge for lithium battery not used for a long time. This mode can remain 60% of the capacity to store and prolong the service life of lithium battery.

The following is the main specifications:
DC Input voltage: 11.0 - 32.0V
Charger power: max.1000W
Discharge power: max.150W
Charge current range: 0.1-40.0A
Discharge current range: 0.1-20.0A
Balance current : 1A
Balance tolerance: ±0.01V
NiCd/NiMH battery cell count: 1 - 26cells
LiPo/Li-ion/LiFe battery cell count: 1 - 8series
Pb battery voltage: 2V～36V
Digital Power: 3V-32V
Operation system: graphical disply

You can find the detailed information in our website:
http://www.ev-peak.com/en/productview.asp?id=114
And the user’s manual in the website:
http://www.ev-peak.com/uploadfile/Download/AK840.pdf
You can download upgrading software in the following website:
http://www.ev-peak.com/en/support.asp

We will be pretty appreciated to have more feedback from you.

Hi!

Yuki from EV-Peak was so kind to send me an AK840 charger, so that I can do some tests and find ideas for improvement.

I like the hardware very much. All metal, no plastic, this is very sturdy. All screws are tight and none is stripped, also very good.
On the inside, The PCB is firmly fastened as well. I especially like the very large heatsink at the bottom, this guarantees a thermally stable operation.

I like the little “rib” at the bottom of the case, it provides a solid stand and prevents hot air from flowing back into the fans. Very nice idea!

The cooling system is very efficient. Even when discharging as fast as possible, the air exiting the charger is not very hot, and nowhere does the charger make a strained impression.

The programming is very easy and self-explanatory. I normally have the habit to read the manuals befor I operate things, but here, it was not really neccessary.
Thumbs up for the display! It's readability is excellent. Many manufacturers have a blue backlight for some strange reason. Blue and black don't have a pretty good contrast. I always suggest white or yellowish backlight.
Here the backlight can be described as white with a blue hue to it, and it's actually very pleasant.

All in all, it was a joy to operate the charger.

But, being the nitpick that I am, I made a huge list of improvement suggestions, which result from my experiences of the past and my wish to have both detailled programming options for special cases, and to possibility to start a charge quickly at the field.

Yuki wrote me, that their engineers are working on this right now, so stay tuned!

I'll attach some images I made so far.

Yuki was generous and provided an AK840 review sample to me to wring out as well Julez. I agree that the hardware seems quite robust and I really like the extruded aluminum case. Firmware is a work in progress and perhaps we can compare notes.

I've provided my 'fix list' and 'wish list' to Yuki.

Cheers,
Mark

Variable speed temp controlled fans? One thing that bugs me about so many chargers is the fans are simply too noisy when they don't need to be. It would be a great feature to have variable speed fans temp controlled fans.

Yes, the fans are thermostatically / load controlled and are very quiet at startup. During charging, they are not noticeably louder than my 306B.

Mark

Correct.

But one of my wishes was to switch the fans completely off when there is only a very low load on the charger. I'm sure that for currents <2-3A the electronics don't need active cooling.

where can i purchase one of these units?

Originally Posted by MarkDawson

where can i purchase one of these units?

You can purchase them from our USA distributer: RC Accessory,INC

Originally Posted by MarkDawson

where can i purchase one of these units?

Hi Mark,

We have 1 unit left in stock. Thanks.

What balance plug is used on the balance port placed on the charger (marked in the attachment)

I need to find/make a parallel board for it.

Originally Posted by rfauske

What balance plug is used on the balance port placed on the charger (marked in the attachment)

I need to find/make a parallel board for it.

That is a JST XH style port. Standard Paraboard will plug into it directly. You will need to change the banana plugs on the Paraboard to XT60.

So I can use this if I change the plug to an 8S JST-XH (as I dont want to use the included balance adapter) and and XT60
http://www.rcaccessory.com/paraboardxhec5.aspx

Originally Posted by rfauske

So I can use this if I change the plug to an 8S JST-XH (as I dont want to use the included balance adapter) and and XT60
http://www.rcaccessory.com/paraboardxhec5.aspx

You do not even need to change it to an 8S JST plug. Just plug the 6S JST plug in all the way to the right.

Look at some of the pictures a few posts back. You will see the battery balance tap plugged directly into the balancer.

Interesting new player in the 1000W market, look forward to more feedback over time from Julez and Mark.

There does not appear to be any on-board data logging. Is there PC-based configuration and/or data logging?

Originally Posted by RC Accessory

We have 1 unit left in stock. Thanks.

Could not find it on your website, what is the retail price please?

Originally Posted by kgfly

Interesting new player in the 1000W market, look forward to more feedback over time from Julez and Mark.

There does not appear to be any on-board data logging. Is there PC-based configuration and/or data logging?

Could not find it on your website, what is the retail price please?

MSRP is $219.95 which includes the 4-1 multi tap balance board, USB cable for PC logging, removable battery clamps, a basic charge cable set and instructions.See pictures from Julez. We are currently out of stock. New shipment is due in next week.

At this time the AK840 does not have PC based configuration. Data logging is done via the PC based software.