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Old Oct 25, 2012, 02:35 PM
jredingt is offline
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I just charged four 6s 2200mah in 15 minutes on my new iCharger 306B! This charger is easily the best purchase I've made yet in this hobby.

I can now charge batteries faster than I can fly them! Thanks Junsi!!!
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Old Oct 25, 2012, 03:05 PM
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Quote:
Originally Posted by jredingt View Post
I just charged four 6s 2200mah in 15 minutes on my new iCharger 306B! This charger is easily the best purchase I've made yet in this hobby.

I can now charge batteries faster than I can fly them! Thanks Junsi!!!
Recently experienced the same. Adds a new sense of urgency at the field. Paid for itself in two weekends IMHO by doubling our flight time.
Old Oct 25, 2012, 03:22 PM
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Originally Posted by seattlebuoy View Post
Recently experienced the same. Adds a new sense of urgency at the field. Paid for itself in two weekends IMHO by doubling our flight time.
Hard to believe there are still guys using 50WATT chargers isn't it?
Old Oct 25, 2012, 03:54 PM
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Hard to believe there are still guys using 50WATT chargers isn't it?
lol

Well, seeing as that is what i just upgraded from, I guess its not so hard to believe(for me).

Whats so hard to believe is how log it has taken for me to give in to the obvious evolution of my charging equipment.

One question I have about the 306B, is it normal for the input wires(coming from the power supply) to get pretty hot when pulling a lot of amps?
Old Oct 25, 2012, 11:36 PM
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Originally Posted by jredingt View Post
lol

Well, seeing as that is what i just upgraded from, I guess its not so hard to believe(for me).

Whats so hard to believe is how log it has taken for me to give in to the obvious evolution of my charging equipment.

One question I have about the 306B, is it normal for the input wires(coming from the power supply) to get pretty hot when pulling a lot of amps?
The wires getting hot is not a good thing. It means that they are too small and/or too long to handle the power passing through them. The shorter the wire is the more power you can get away with pulling through them but there is a point where larger wire is needed.
Old Oct 26, 2012, 01:11 AM
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The stock input wires will get warm when getting close to max current (50A).

Compensating for too thin wires by making them shorter does not work. Voltage drop will be reduced, but insulation might melt anyway.

Fred
Old Oct 26, 2012, 05:05 AM
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Compensating for too thin wires by making them shorter does not work.
Please explain why not.
Old Oct 26, 2012, 05:35 AM
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Please explain why not.
The surface temperature of a 20cm wire will be the same as for a 50cm long one, for a given current.

Fred
Old Oct 26, 2012, 05:46 AM
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If I respond to that as I had just typed it will just get me a warning . I will just say your beliefs / experience goes against Ohm's laws and my many years of experience.
Old Oct 26, 2012, 09:07 AM
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you need good field generator to charge batteries at 20-30A rate.
Old Oct 26, 2012, 09:07 AM
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Fred is correct. Temperature rise in wire is largely dependent on cross sectional area (wire gauge). It's very true that 4 feet of wire will have 4 times the resistance and thus 4 times the power dissipation as a 1 foot length of the same wire. However, it will be dissipating this power over 4 times the surface area so the net result is that the surface temperature of the wire will be effectively identical, regardless of length. This is consistent with Ohm's law.

That said, if there is additional heatsinking at the termination, a shorter length of wire will have lower temperature rise. In very short lengths of wire, this can be significant. In long wire lengths, it is insignificant.

If one wishes to lower wire temperature, either lower current draw, increase wire gauge, or improve cooling with a fan, heatsinking, etc.

At maximum 50 amp source current, the 12 gauge wire on a 306B or 3010B can be expected to get quite warm. This should pose no issue as the silicone insulation can easily handle such. Fusing current of 12 AWG wire is over 200 amps so the wire itself can easily handle 50 A continuous for an extended period of time with zero issue.

Mark
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Last edited by mrforsyth; Oct 26, 2012 at 09:43 AM.
Old Oct 26, 2012, 09:22 AM
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Gents here is one for you.

http://powerequipment.honda.com/gene...models/eu1000i


Old Oct 26, 2012, 10:02 AM
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Originally Posted by mrforsyth View Post
If one wishes to lower wire temperature, either lower current draw, increase wire gauge, or improve cooling with a fan, heatsinking, etc.
Assuming max input current is not the limitation (50A), there will be a slight effect of shortening the wire, since voltage at the charger will increase which will result in lower current for the same charging power.

Fred
Old Oct 26, 2012, 10:09 AM
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True, but that should be negligible as voltage drop in a short length of 12 AWG wire is insignificant at <50A.

I've also experienced that poor connections can cause excessive power loss. In these instances, lengthening wire can aid in power dissipation and actually lower wire temperature.....
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Old Oct 26, 2012, 08:17 PM
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But at the cost of more power loss. Best case is to have good connections and chose a wire size that meets or exceeds the requirements.
Last edited by BGR; Oct 26, 2012 at 08:19 PM. Reason: Edit.


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