DeWalt DC305-XE Spezifikationen PDF herunterladen (Seite 12)

that 10C packs will drop their voltage heavily when taxed to more than about 12-15C (the typical

peak or burst rating of 10C packs). A 25C pack will happily deliver in excess of 35-40C bursts

before its voltage output drops, so dont always assume a 10C 8000mah pack will be just as good

as a 25C 5000mah pack in a high-drain application; that would be a false economy. For low drain

setups however where runtime is more important than current output, you would be fine with the

lower spec, higher capacity pack.

What brand?

There are many lipo brands, several of which use the same specific company to produce their

lipos for them, the only differences being the capacity and discharge rating options for any given

lipo- horses for courses (meaning certain lipos are offered to fulfil a certain need or application,

hence the differences between any given pair of lipos from two different manufacturers).

The top name to look out for is Enerland. They are a Korean outfit producing the best quality cells

that are used by numerous companies, such as those from RC LIPOS; the latest G3 packs are

receiving rave reviews, and with good reason. Kokam cells are also very popular, as are the

Flightpower and Trakpower lipos that resemble gold bars. Next on my list would be the

increasingly popular Hobby King/Hobby City lipos, that come in a myriad of shapes, sizes and

capacities to suit most people’s desires. SPC, TrueRc and the new Blue branded lipos from

Hobbypartz.com are also very popular for the budget minded user. Maxamps lipos are very

popular, but mainly due to the fact they advertise so much; they make lipo selection easy for

beginners, but the price point is conciderably higher than it should be compared to other & better

brands with a similar or greater spec.

What runtime?

Run time is also directly related to Mah capacity. Generally speaking, your typical 8000mah setup

will run for approximately 40-60 minutes in a stock Emaxx, and around half that in a BL setup. It

is very difficult to estimate runtime however as it depends greatly on the setup, terrain, ambient

temps and driving style/ throttle usage; a full on speed machine will drain packs much quicker

than a trail truck type setup.

What charge rate?

Lipos require a special type of charger that uses the CC/CV method (Constant Current/ Constant

Voltage). Provided your charger is capable, you will be best served using a 1C charge that,

meaning you charge the pack at 1x its capacity. A 5000mah pack will be charged at 5amps, an

8000mah pack at 8amps, and a 4700mah pack at 4.7amps. Some manufacturers will claim a 2C

charge rate is possible for their lipos, but I would always recommend a 1C for safety reasons

unless the instructions specifically state this. A123 cells or LiFePo4 can be charged at upto a 4-5c

rate safely since they have a more stable chemistry.

What about balancing?

Lipo packs made up of more than one cell in series will require balancing. Lipo cells, no matter

how good, will sometimes vary in terms of their exact capacity and discharge rates in relation to

the other cell(s) in their pack, so it is important that any imbalance between cells is equalised

during or after charging to prevent possible damage due to over discharging or over charging

even. Where as a charger will pump current into the pack as a whole, only stopping when the

target voltage is achieved, a balancer (or balance charger) will read the individual cell voltages

and bleed off excess voltage/current from any cell that is getting ahead of its companions.

Likewise, any cell that is lagging behind will receive extra current to keep it inline. The amount of

current a balancer can add or drain varies, but around 300-500mah is fairly typical, meaning that

small imbalances can be ‘fixed’ during a charge, but larger imbalances may require longer to

correct before all the cells are at an equal level of voltage. The fully charged voltage of a lipo cell

is 4.2v, so any higher than that and damage may occur; any lower than about 2.6~2.8v and

damage will also occur; 3.0~3.2v is seen as the ideal minimum voltage before a lipo cell should

be stopped from discharging. Storing lipos for long periods without use or cycling (discharge and

charge) them may result in the cells becoming partially drained and out of balance, so checking

them occasionally is recommended. Unlike Nimhs though, they do not need to be re-peaked or

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 22 23

Kommentare zu diesen Handbüchern

Keine Kommentare

DeWalt DC305-XE Spezifikationen Seite 12

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Kabellose Kettensägen DeWalt DC305-XE