[NSRCA-discussion] NEW IOTA 55amp POWER CONVERTERS

Tue Mar 7 03:22:27 AKST 2006

I guess this assumes the charger is 100% efficient?

  Has anyone measured the current draw from the 12v source while the charger is putting out x amps?

  From what I gather, the Iota will be the limiting factor. I believe the Iota will go into a constant-current mode once the 55 amp rating is reached, IOW, the voltage will drop. This will limit the power drawn from the generator.

  Another way to approach this is to use a small deep-cycle battery connected to the Iota output. The battery will not have to carry the full load of the chargers, just the excess that the Iota might not be able to supply. When one of the chargers is done, the deep cycle battery is charged back by the Iota.

  Bob R.

Robert Mairs <robertm at sssnet.com> wrote:
  Verne,
If your charging 10s, the max the 1010 can charge at is 5amps. that's 42v x 
5amps = 210watts.

2 chargers charging at this rate would be 420watts.

5s @ 10amps would be 210watts.

4 chargers at this rate would 820watts.

You could run two 10S chargers at the 5amp setting without any problem with 
the power supply or generator.
4 chargers at 10amps for 5S would overload your power supply, but the 
generator should still handle it. It would be close because the generator 
prob isn't 100% efficient.

----- Original Message ----- 
From: "Verne Koester" 
To: ; "NSRCA Mailing List" 

Sent: Tuesday, March 07, 2006 1:12 AM
Subject: Re: [NSRCA-discussion] NEW IOTA 55amp POWER CONVERTERS

> Thanks Chad,
> I'm at least a little less confused than before. If the Iota is a 740 watt
> power supply, does that mean that that's the most it'll ever be pulling 
> from
> the Honda? The Honda is rated at 900 continuous, 1000 surge. If I'm
> understanding you, one Iota 55 amp supply will power two 1010's which in
> turn will charge four 5300's at the same time. You said that it'd be 
> close.
> What's taking the beating, the power supply or the generator? Your 
> patience
> is appreciated!
>
> Verne
>
>
> ----- Original Message ----- 
> From: "Chad Northeast" 
> To: "NSRCA Mailing List" 
> Sent: Tuesday, March 07, 2006 12:40 AM
> Subject: Re: [NSRCA-discussion] NEW IOTA 55amp POWER CONVERTERS
>
>
>> Hi Verne
>>
>> The 1010's are 210-220W chargers max (so 10s packs @ 5A rate)....so your
>> 1000W generator could handle 4 of them depending on losses but it should
>> be close.
>>
>> The Iota's are 740W power supplies for reference.
>>
>> Converting everything to watts (charge rate*4.2V*#cells in series) makes
>> everything much easier to understand :)
>>
>> Chad
>>
>> Verne Koester wrote:
>>
>>>Hi Adam,
>>>Well, you almost answered my question. Will a 1000 watt generator power
>>>two
>>>1010's at the same time while they're charging four TP 5300's? Since I'm
>>>on
>>>it, will that take one 55 amp Iota, or two? As I said, I'm electrically
>>>stupid.
>>>
>>>Verne
>>>
>>>BTW, I'm sure I'm not alone, just not afraid to admit it... ;>)
>>>
>>>
>>>----- Original Message ----- 
>>>From: "Adam Glatt" 
>>>To: "NSRCA Mailing List" 
>>>Sent: Monday, March 06, 2006 11:03 PM
>>>Subject: Re: [NSRCA-discussion] NEW IOTA 55amp POWER CONVERTERS
>>>
>>>
>>>
>>>
>>>>Probably just for home charging, Verne, because I have a 450W (on the
>>>>12.5V rail) ATX computer power supply that is smaller and lighter (it
>>>>fits in my TX case). In your case, though, one large power supply will
>>>>almost certainly be easier to deal with and transport than two smaller
>>>>(I'm guessing) ones.
>>>>
>>>>Remember, you can sell your 109's for $80 each and buy 1010's for $200
>>>>or less, and the 1010 has nearly twice the power as the 109.
>>>>
>>>>-Adam
>>>>
>>>>Verne Koester wrote:
>>>>
>>>>
>>>>>Adam,
>>>>>Are you employing those for field use or just at home? Being
>>>>>electrically
>>>>>stupid, I'm just wondering, and have been, whether a 1000 watt Honda
>>>>>generator would power all of that. For the time being, I have two 18 
>>>>>amp
>>>>>power supplies powering four Astro-Fight 109's off the Honda, and that
>>>>>works
>>>>>fine. However, I really like the ThunderPower 1010's ability to be shut
>>>>>down
>>>>>by the pack balancers if things aren't right.
>>>>>
>>>>>Verne
>>>>>
>>>>>
>>>>>----- Original Message ----- 
>>>>>From: "Adam Glatt" 
>>>>>To: "NSRCA Mailing List" 
>>>>>Sent: Monday, March 06, 2006 10:42 PM
>>>>>Subject: Re: [NSRCA-discussion] NEW IOTA 55amp POWER CONVERTERS
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>>There are only two output jacks (one negative, one positive). Each
>>>>>>jack
>>>>>>looks to be a 1cmX1cmX2cm rectangular tube made of 2mm thick copper.
>>>>>>The top of these tubes have one ~7mm set screw that is tapered to 
>>>>>>about
>>>>>>half that diameter where it clamps down on the wire you insert into 
>>>>>>the
>>>>>>tube.
>>>>>>I have them in a drawer until my 1010's arrive, but my plan is to try
>>>>>>to
>>>>>>fit three stripped ends of three Deans 12ga Noodle wire into each 
>>>>>>tube.
>>>>>>Each wire will have its own connector to mate with the charger's
>>>>>>connector. In my case, this year I'm standardizing on the Neu 5.5mm
>>>>>>bullet. Worst case, the 3x 12ga copper won't fit, so I'll drop to
>>>>>>Deans
>>>>>>16ga. Max current will be 15A through the power supply cables (each),
>>>>>>so not unreasonable for 16ga - I just have a thing about smaller than
>>>>>>possible wire.
>>>>>>
>>>>>>-Adam
>>>>>>
>>>>>>Jerry Budd wrote:
>>>>>>
>>>>>>
>>>>>>
>>>>>>>Hey Adam,
>>>>>>>
>>>>>>>Quick question about these. Do they have banana plug power output
>>>>>>>connectors? If not, how are you connecting your chargers to them?
>>>>>>>
>>>>>>>Thx, Jerry
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>>Cameron, thanks for passing this on! I bought two of the Iota 55A
>>>>>>>>units
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>from this vendor and received them 7 business days later. They both
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>>check out OK.
>>>>>>>>
>>>>>>>>Great deal, you saved me a lot of money. If anyone in Muncie needs
>>>>>>>>help
>>>>>>>>charging, just look to Chad and I. Between us we are up to about
>>>>>>>>5.5kW
>>>>>>>>of 12.5-14.5VDC power. That hotel won't know why their electricity
>>>>>>>>bill
>>>>>>>>doubled in July.
>>>>>>>>
>>>>>>>>-Adam
>>>>>>>>
>>>>>>>>Cameron Smith wrote:
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>> I received this offer from the guys I bought from.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> If you contact me at 574-538-8837, or email me @
>>>>>>>>> drpromiseinc at hotmail.com. I will give you the converters for 
>>>>>>>>> $80.00
>>>>>>>>>+
>>>>>>>>> $10 shipping. $90.00 Total for you or your friends.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> I have bought 2 from these guys & they were new in the box
>>>>>>>>> W/warranty, I met them thru eBay. Fast shipping also.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> ------------------------------------------------------------------------
>>>>>>>>>
>>>>>>>>> _______________________________________________
>>>>>>>>> NSRCA-discussion mailing list
>>>>>>>>> NSRCA-discussion at lists.nsrca.org
>>>>>>>>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
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>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
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>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>>
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>>>>>>
>>>>>>
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