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HomeRC & Power✈️Aircraft🚁Helicoptere-Electric Battery-Charger-pSupply › What will I need to move up to a 50 size model charger-wise?
09-10-2006 08:01 PM  14 years ago
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cudaboy_71

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sacramento, ca, u.s.

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What will I need to move up to a 50 size model charger-wise?
i'm really comfortable with my 3s packs--have an astro109 and a balancer. that's all great.

i'm saving up for a trex600 or the swift 620, or similar for the end of the year and i'm a little unsure about moving up to larger packs--especially throwing in packs in parallel. when my charger says 1-9 cells does that only mean in series, or total cells in the pack?

i ask, because a 6s2p pack seems pretty common to put in a 50 sized bird. and, if i've got to buy new equipment, i might as well plan for the future---what about 8s and 10s parallel packs? i've never heard anyone talk about chargers that can handle 12, 16 or 20 cells. do you charge each series separately?

and, what about balancing? my current balancer is only good for 3s. any recommendations?

thanks.
if it ain't broke, break it.
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09-10-2006 08:57 PM  14 years ago
FrittsLogic (RIP)

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Honolulu, Hawaii

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Your Astro flight 109 can handle 1-9 cells in series. So if you had, for example a 6s2p, you would have 12 total cells, but only 6 in series. So your charger could handle it no problems. FWIW, Thunder power balancers seem to have the lion's share of the balancer market. Even Flight power is starting to ship their batteries with TP balancing leads. So you can start with the Astro 109, and you should buy some balancer to keep your investment in larger batteries safe. If you do buy a TP balancer, you can later move up to their TP1010C that talks with the balncer.We don't need no stinking flybars!
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09-10-2006 11:00 PM  14 years ago
cudaboy_71

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sacramento, ca, u.s.

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i think that's what i was after. it says very clearly on my astro "1-9 cells"...and, it says similar things on other chargers i've researched. but, nowhere does it say "in series"...so, having no experience i was unsure if that was series or total.

thanks.

follow up question: when setting the charger for a parallel pack do you set the charger to the 'C' rate of the cell or the pack? (3000mah cells--in 2p for a 6000 mah pack: charge at 3amps or 6amps?)
if it ain't broke, break it.
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09-10-2006 11:09 PM  14 years ago
Rob_T

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Set the charger for the capacity of the pack not the individual cells.

For example, suppose you have a 2P pack made from 2100 cells. It would have a capacity of 4200. Approximately half of the charge current will go to each cell, so if you set the charger to 4.2A then about 2.1A will go to each cell. That I'm sure you recognize is the normal charging current for those cells,
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09-10-2006 11:12 PM  14 years ago
FrittsLogic (RIP)

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Honolulu, Hawaii

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If you charge them in parallel, set the charge rate based on total capacity. So if you have 2 x 6s 3000 mAh batts in parallel, you would have a 1 x 6s2p 6000 mAh battery. So a 1C charge rate would be 6amps, with the charger set for 6 cells. If one of the parallel packs tops off first, the charger will preferentially charge to the pack with the lowest voltage, so when charging in parallel, the sytem will automatically level the batteries total voltage. However, when comparing the cells from a series perspective, one may be higher or lower than the rest. this is where cell balancing comes in. You really need to do this so that all cells in series start out with the same voltage.We don't need no stinking flybars!
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09-11-2006 12:26 AM  14 years ago
cudaboy_71

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thanks guys. i'll be blowing up $500 packs in no time if it ain't broke, break it.
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