MaxAmps Race Edition Lipos

[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.

[josh9mille]

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?]

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.

[josh9mille]

Originally Posted by What's_nitro?

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.

wowzaz! those are some pricey 1ohm resistors!

[JERRY2KONE]

Originally Posted by What's_nitro?

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.

Holy crap for $500 a piece I would think so. I think the idea of this descusion would be to do this without breaking the bank, right? There have to be better ways of doing this.

[whitrzac]

those are EXACTLY what I am talking about...



ex
http://cgi.ebay.com/Wirewound-Alumin...item4aa34881a9
http://cgi.ebay.com/Wirewound-Alumin...item4aa35c65df

300w, .22ohm
http://cgi.ebay.com/Ohmite-Resistor-...item2796a634dc

[sikeston34m]

Guys, Guys..............

Why are you looking at re-inventing the wheel?

Maxamps has already done the testing to establish that their cells are capable of 75C Continous AND 150C Bursts!

OK, Maxamps.

How did you come up with 75C Continous AND 150C Bursts?

Are there some Graphs laying around there somewhere?

Or did you just pull those numbers out of your.............................................. .................................................. .................................................. .................................................. .................................................. .................................................. .................................................. .................................................. ...........Hat?

[What's_nitro?]

Originally Posted by josh9mille

wowzaz! those are some pricey 1ohm resistors!

Originally Posted by JERRY2KONE

Holy crap for $500 a piece I would think so. I think the idea of this descusion would be to do this without breaking the bank, right? There have to be better ways of doing this.

Deet dee dee.... See where it says "50"? If I had the cash I'd offer him $300. $6 a piece is a good deal for those resistors. The shipping is a bit high, though.

[lincpimp]

I would love to hook up one of these 150c lipos to Pres Obama... See what kind of load that produces!!! A crap load I am sure, ahahahahaha.

Sorry, just could not help drawing a parallel with the kinda of honesty MA provide with the same virtue that our current pres has...

[Finnster]

Originally Posted by lincpimp

I would love to hook up one of these 150c lipos to Pres Obama... See what kind of load that produces!!! A crap load I am sure, ahahahahaha.

Sorry, just could not help drawing a parallel with the kinda of honesty MA provide with the same virtue that our current pres has...

Whatchu you mad about? With all the new tax cut money we're gonna borrow from the Chinese, we'll have moer to buy more chinese crap? All of our Fiscally Responsible Leaders in DC said its good for us.

[BrianG]

If anyone is interested, I have around 150 (maybe more) 3 ohm 50w resistors not being used. They are all new Dale metal finned case resistors, just be aware that the 50w rating is only valid if mounted on a heatsink and cooled. Just put the resistors in parallel and series arrangement to get the ohmic value you want. I even have some 12v fans to aid in cooling. PM me if interested.

[josh9mille]

Originally Posted by BrianG

If anyone is interested, I have around 150 (maybe more) 3 ohm 50w resistors not being used. They are all new Dale metal finned case resistors, just be aware that the 50w rating is only valid if mounted on a heatsink and cooled. Just put the resistors in parallel and series arrangement to get the ohmic value you want. I even have some 12v fans to aid in cooling. PM me if interested.

I remember from electronics class in highschool that running resistors in parallel will usually come up with an oddball ohm rating, and there was some confusing math involved with it that i never understood. I know it is easier math when the resistors are the same, but it was when they were different and run in parallel is where it got really strange.

[BrianG]

The math isn't overly complex.

For parallel resistors, there are a few methods: If all resistors are the same take the resistor value and divide by the number of resistors. So, if you have 100 X 3 ohm resistors, that would be 0.03 ohms. If using different value resistors (or can be the same), you can use "product divided by the sum" (R1*R2*R3*Rn)/(R1+R2+R3+Rn) or the "conductance" method 1/(1/R1+1/R2+1/R3+1/Rn).

For series, just add them up.

The advantage to using multiple resistors, especially in something that will generate this kind of heat, is the ability to spread out the thermal load. Also, you have much more flexibility in the actual ohmic value.

I was going to make a lipo test station a while back (which is why I have these resistors) and was going to create several 20 parallel resistor banks of 0.15 ohms. Then, just put those banks in series or parallel depending on the desired load and lipo voltage under test. Originally, I was going to use a MMM ESC in high-power brushed mode (can do ~300A for short tests) to regulate the actual amount of power to the resistors. The project never got anywhere because of a few technical details. You can read about it here if interested: http://www.rc-monster.com/forum/showthread.php?t=21478

[Bondonutz]

Nah, It's this simple.

"Put Up or Shut Up"

All of us have ben pretty polite considering how we all know it's the normal BS coming from those guys. He just can't produce anything other than a video that doesn't even prove their packs weren't even used. Black Heat Shrink and a decal, Big deal, I'll tell a white lie for $500.00 worth of Lipos.

Has anyone seen more "proof" than we've seen here on another forum ???

[JERRY2KONE]

NOPE I sure haven't. Honestly I only visit RCM & UE, but outside of this thread I have not seen any hype one way or the other. I just don't get how these guys can go into this new product sale and not post up some kind of reality showing specs of some kind to back up their big add (TRUE 150c RACE READY LIPOS) What a bunch of crap. I am sure that for the most part these packs can do quite well in comparison to their past cells, but in comparison to the rest of the Lipo market I have my doubts, and the fact that they have now ignored this thread shows that they are back peddling in the realization that they are not as good as they stated. I mean come on, we all know that there is no way those wires would handle the kind of amperage suggested without a major failure. The silence of Brandon over the last week or so says it all for me. He has no way to show anything to back this add up. Don't give us this shabby video of starting a dragster engine. Who cares. Just hook a pack up to a loadbank and show us some video of the load and how the pack handles said load with temps, amps, voltage and so on. Stop all the BS and as stated previously "Put up or shut up"