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NiMhs - 7 cell pac, 4400mah charging at 4.4amps would need at the most roughly 10v (remember you have to overcome pacs internal resistance) X 4.4a = 44watts. As long as your 3300s are 6 - 8 cellpacs, you'd be fine with a 50watt charger.
C&B RC - one note - all your calcs use nominal lipo voltage. There will be a few moments where the max voltage of 4.2v/cell will determine watt requirements. When mine switch from CC to CV portion of the charge, there's a few moments before the current stats going down, this will be the max watts needed. Gets more important as cell count goes up as you pointed out. |
yeah my packs are just 6 cell packs so i'm thinking the MRC 989 should be good enough for me, even if i start to get some lipos. Anyone use the MRC 989? thanks for all the help guys.
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Cool! I got it straight.
Duster-I've got a question for you. It's a little beyond this thread but I'll ask anyway. The hyperion 610inet claims 10A 250w but I've read that to get the maximum out of this charger you need to use a PSU that can deliver 15v & 20A. Why 15v? I understand the efficiency loss and the higher amps to boost the voltage output for say a 6S lipo but won't a 13.8v @ 30v PSU be just as good? |
The 15v minimum PS business is invoked only in referring to charging "high voltage batteries at high current (charger output 250watt)" and they spec the PS should be rated for 350watt (or more) which is 23.3a "to insure reliable performance".
This prob refers to 6S lipo charging at 10a - 0610i max capability. Thats 25.2v minimum when it ends the CC part of the charge and 252watts. So for a PS thats 13.8v, its pulling 18.3a output for the same power - seems like even a good 20a supply should be capable of doing that. Note these are continuous amp ratings, not maximum. Maybe they're being cautious - product liability concerns??. I charge 6S a123s at 10a and my 13.8v 25a PS never shows any sign of distress. Fan cycles just like it does when I'm charging a 1600 2S at 1.6a. I saw that in the manual, but am not real concerned about it, more of a curiosity. |
Originally Posted by Fletcher6371
(Post 4899350)
I'm looking for a good/decent charger that has the capibility to charge on AC and DC. NiCAD is what i'm mainly using, but LiPo could be in my future. I've seen the ICE but i'm really wanting something that will be able to work on AC. My price range is about 100-150 (preferably cheeper:lol:) I've also looked in to the Oynx chargers, and the Venom charger. But I'm mainly a nitro guy and not too familiar with electrics. I'm wondering if there is a charger that can charge a 12v gel cell as that is what i have in my starter box. ANY help would be very appreciated. I'd like to know someother peoples thoughts to different chargers. THANKS
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