MaxAmps Race Edition Lipos - Page 28 - RC-Monster Forums

padrino · 12.05.2010, 02:51 PM

Quote:

Originally Posted by slimthelineman

Just use a bunch of the deans bulb dischargers they are 30 amp loads with 10 #1157 automotive lightbulbs. Wire a bunch in series and watch her glow. Kinda old school use to use them for ni-cd's and ni-mh packs but good size load for not much cash and real simple.

I'm apt to do it, I would love to see 75C from that pack over and over again. Parts ordered!

mistercrash · 12.06.2010, 10:40 AM

1157 automotive light bulbs, 2 amp load for each light, that would be 487 light bulbs to get a 75C load on a 6500 mah lipo right? That would not only light up the room, it would heat it in winter also. What could be used for a LVC?

padrino · 12.06.2010, 11:48 AM

at 2A each it's half the bulbs, isn't it? In addition to that I was looking at how to wire something up and expect the 12 awg MA puts on this pack will have issues before it gets close to 75C, off hand I don't know what it should handle before it falls apart but I assume it will?

slimthelineman · 12:29 PM

It would take around 250 to get your 75c load. I'm guessing around 50c will do the cells in. And yes it's bogus to think the deans and 12awg wire will take these loads. These numbers are fake no tests have actually been done by ma at these amperage loads. The componets will not hold. Wire conectors and the sort. So if someone wants a space heater to destroy an ma brick go for it but make sure to get it on video so someone can actually post some real info on testing these packs even if the manufacture won't do it to back their products.

Also deans or another company used to make a series lvc to use with their bulb discharger.

mistercrash · 02:48 PM

I used to have a Deans bulb discharger with the cut off they called the black box. I was going with the fact that it had 10 bulbs and was a 20 amp discharger so I assumed each bulb was pulling 2 amps. 1 amp per filament. So when I calculated how many bulbs, I forgot to divide by two

250 bulbs is right. The black box cut off that was used back in the day with the Deans discharger was for 4 and 6 cell nicads, I was still using it when the nimh came out. Oh geez I'm old, I got in this hobby when the red 1200 mah matched Sanyo nicads were the hot ticket

JERRY2KONE · **Hair dryers -** 12.06.2010, 06:11 PM

Wouldn't it be easier to hook up a few hair dryers or hair curling irons that can draw like 1000 to 3000 watts each. I know you would have to do several cells at once to get enough voltage, but 250 bulbs sounds like too much work to get setup. Or maybe some other kind of heating coils that would easily draw enough amps to get 75C without having to build a small city of lights. Maybe some 12volt block heaters, or a 12volt motor with some kind of load in it. Maybe a compressor, or a generator. Then just apply a clamp on amp meter to measure the exact power draw.

Finnster · 12.06.2010, 06:11 PM

Its really unfortunate that these cells don't come in a smaller capacity that would be more feasible to stress. Tho I'm not shocked.

In all these shootouts (such as bigsquid), I don't understand why they don't use small cells, like 2200mah, and put them in a 1/8th and run them hard and make them work. Putting a 1/8th size batt in a 1/10 scale and doing light runs is a waste of time.
If the cell chemistry is all the same, the difference in the cell capacity variants can be largely ignored

E-Revonut · 12.06.2010, 07:36 PM

I have to do some digging but I may have a pretty good way of holding a large load on a battery. I have a 700 Watt DC-AC power inverter. It has a low voltage cut off at 10V but I'm not sure what the max input voltage is. It's designed to be hooked to a car battery so I know it will handle at least 14 but If it would handle 4s lipo I could hold about a 60 amp load on a pack. I could still run the pack through my Eagle tree for Data logging or even do a live view so I can monitor the voltage and cut it before going below 3v/cell. I know 60Amps isn't anywhere near the "rated" capabilities of these packs but it would be a continous load at more than twice the average current draw they would see in RC use

sikeston34m · 12.06.2010, 08:03 PM

Quote:

Originally Posted by E-Revonut

I have to do some digging but I may have a pretty good way of holding a large load on a battery. I have a 700 Watt DC-AC power inverter. It has a low voltage cut off at 10V but I'm not sure what the max input voltage is. It's designed to be hooked to a car battery so I know it will handle at least 14 but If it would handle 4s lipo I could hold about a 60 amp load on a pack. I could still run the pack through my Eagle tree for Data logging or even do a live view so I can monitor the voltage and cut it before going below 3v/cell. I know 60Amps isn't anywhere near the "rated" capabilities of these packs but it would be a continous load at more than twice the average current draw they would see in RC use

I've considered this before, since an AC inverter can really generate ALOT of DC load.

Problem is: The lower input limit is 10v, but the upper input limit is 15 volts.

E-Revonut · 12.06.2010, 08:10 PM

Did some searching and I found that the input voltage was limited to 15V as well. It could still test a 3s pack down to 3.33V/ cell

josh9mille · 12.06.2010, 08:37 PM

How about a car hydrolic pump? Thos guys run upwards of 16 batteries sometimes. and they are wired in series and parallel. You can pick up a pump for fairly cheap and hook up a cylinder to it. figuring out how to put a load on it is another story though....

whitrzac · 12.06.2010, 09:16 PM

you can get old 100w+(no typo) resistors from surplus places on ebay for 10-20 each...

JERRY2KONE · **Household items. -** 12.06.2010, 09:49 PM

I was trying to think of items that one might have around their household to keep from having to purchase anything, unless of course that someone is willing to do that just for this purpose. I am sure that there are several material things around ones house that may be able to put a load on a DC electrical system. Heating elements are one of the best for loads, but I am sure that there are several other items that may work. Creating a load bank with items that have a known wattage load would make the easiest setup. Like a 2000 watt hair dryer, or a 3000 watt heating plate, or waffle iron, but most of those are 120volt. So maybe a vehicle block heater or a drum warmer. One of the electrical gurus should be able to post up and give some other suggestions.

josh9mille · 12.06.2010, 10:25 PM

Quote:

Originally Posted by JERRY2KONE

I was trying to think of items that one might have around their household to keep from having to purchase anything, unless of course that someone is willing to do that just for this purpose. I am sure that there are several material things around ones house that may be able to put a load on a DC electrical system. Heating elements are one of the best for loads, but I am sure that there are several other items that may work. Creating a load bank with items that have a known wattage load would make the easiest setup. Like a 2000 watt hair dryer, or a 3000 watt heating plate, or waffle iron, but most of those are 120volt. So maybe a vehicle block heater or a drum warmer. One of the electrical gurus should be able to post up and give some other suggestions.

Im pretty sure all of the things you have listed are require AC voltage.

What's_nitro? · 11:18 PM

Ehhemmm....

http://cgi.ebay.com/ws/eBayISAPI.dll...m=230487830008

You could build a serious load tester with these. Different series/parallel arrangements for different voltages/loads.