Hyperion EOS 7i
 

Another question guys. Does anyone run the EOs7i? If so, does your charger stop in the middle of a charge and tell you that the output voltage is too high? Or does it charge without interruption?

Perhaps its set for less cells than it expects at the start of the charge process.?

Lipo's i presume? My charger won't start until you confirm the amount of cells.

Doesn't sound good though.

That's what i'm thinking. But i triple checked the settings. Brian G asked the same question basically. I think i'm returning the charger. IMO, it should be able to be set and charge without getting the error message! Any other opinons with this specific charger would be greatly appreciated! If i try to charge in series, it tells me output voltage to low, yet i'm pushing more than 12v to the charger. When i charge batts in single, then it tells me that the "output voltage too high"? What is the deal!

Mine does this when charging single cells. I found that it's because the charge rate is set too high, although it shouldn't matter. If you turn it down to under 1 amp, it should be ok.

Sounds like it needs a firmware upgrade.

It can charge with a certain amount of power, when the cells get full, the current stays the same, but the voltage gets higher, meaning it needs to put out more watts in total. Since there is a limit in watts it can deliver, it's likely that this is causing the problem.

Sounds like you set it to the maxximum amount of current to charge with?

Yes the maxx, then the middle, and finally 1amp and lower....all the same. I tried that too. i even tried charging at .10 amps, still get the same error message! Quite frustrating! And poor CHC. The other night on IM, i totally vented on him! (sorry!) I was really upset. Get all the new equipment, and it was worse than my old set up! Can we say PIXXED!

Leroy has got a thick skin, he can take something..

Unfortunately, I don't see where the upgrade would be done through. I took it apart and didn't see any socketed ROM chips, nor did I see a place to connect a cable (unless you count the temp probe connector).

As to how the power limit is handled. I've tried it with NiMH and as cells charge up, the voltage goes higher (like you said). But if the 120w power limit is reached, the voltage still climbs, but the charger apparently computes the max charge current based on the voltage, so the current steadily falls. At any point in the charge, you can multiple the voltage by the current and it will be exactly 120w. Kinda like a cross between a constant current and constant voltage source - a constant power source! :)

I've seen some of the issues neweuser has experienced but was able to work around them. My issue was that emolis tend to get out of balance quite a bit when new. They slowly get better after a few cycles though.

It sounds like a call to the dealer for an exchange might be in order.

Neweuser: I just thought of one more thing to try before you give up on the 7i. I know you measured the power supply DC voltage and it looks good, but what about the AC voltage? There could be a filtering issue and AC "ripple" could be causing weird things with the charger. The AC might be too high in frequency to measure with a cheap voltmeter (unless it was a "true RMS" meter), so maybe hook it up to a car battery and try charging something? Can't get any closer to DC than that! Don't run the engine though for the test.

Austin suggested that. I tried last night when i got home. It gave the same result int the same amount of time. In fact, i didn't just leave it downstairs where my car was. LOL, so i stood there, watched it, and same thing! "output voltage too low". And like i said, when i tried the single battery, i get the "output voltage too high"? Anywho, Asutin took good care of me. He's letting me send it back. So that's good. You ahve been awesome Brian. Austin also asked about my wires being too long going to the batteries as well. They are about 4in in length if that, so i don't see that being a problem. But funny that you said...
"but the charger apparently computes the max charge current based on the voltage, so the current steadily falls. At any point in the charge, you can multiple the voltage by the current and it will be exactly 120w. Kinda like a cross between a constant current and constant voltage source - a constant power source!"
Because once the volts are up there, my amps begin to drop

Cool, I'm glad he's easy to deal with.

About the amperage dropping thing: the charger will do that anyway when charging lipos (no matter what current you are charging at) and the pack reaches 4.2v per cell - that's the constant voltage stage.

Very good to hear that is normal. For a minute i thought i was losing my mind! LOL, thanks Brian. So when the volts hit maxx, then the amps start to drop, that is normal. GOOD NEWS!

No problem new e user.
I try rene. Some days things seem to get under the skin though.
It is very strange the things it was doing for sure. Let us know if the new charger does it.

I will foresure. We can chat more tonight via IM. Thanks again for listening to me rant last night!!!! So sorry! I orderd the 989 from Mike, he shipped it already too! I'll let you know. Austin said that another option is the Duratrax Ice charger is good too. may look into that too.

The ICE is an AWESOME charger. For you, the only problem with it is the 4s Lipo limit, but other than that it's for sure one of the best chargers. It's got a huge display, and can even graph the voltage. If there were to be an ICE that could handle a higher cell count and would have some form of communication port, it would be the ultimate charger IMO.