post your load testers!

[teyber]

hello!

There seems to be so many different types of load testers, and so many types of ways to read the wattage. I have seen some very unique ones (piotres:up: )

So if you want, just post picture and explain how well your results have been. Also what type helps:up:

Regards

[wdrzal]

Study up on "Ohms Law" ;)

[Polizei]

P=VI helps too. Can't calculate power without that. ;)

[wdrzal]

P=VI helps too. Can't calculate power without that. ;)

Actually you only need any 2 values to calculate the other 2 values using ohms law.Values are:

"P" power(wattage) "E" (voltage) "I" (amperage) "R" (resistance)

[[XC] 2long4u]

The thread is post your load testers.
I don't have one yet. I need to get my copper block back from my buddy.

[PhilippF]

We have some discussion here in Germany/Austria going on about loadtesters at the moment. Many use 230V heating cartridges with a dimmer to adjust power and a kind of a kill-a-watt meter to show the used power. This is, in my humble opinion, often very far off from the real power consumed. I had 3 different power meters like a kill-a-watt here and they were often off by 40%. The reason the leading edge of the dimmer which makes the voltage so irregular and hard to measure the effective voltage.
I prefer a DC load tester which has 2 resistors 1Ohm/50W in series and is hooked up to an adjustable DC power supply 30V/30A. Also I mounted 2 sense lines to measure the exact voltage drop over the resistors without the connection lines.

Regards,

Philipp

[DagoDuck]

Probably the best solution IMO, PhilippF.

[teyber]

wow very profesional phillip!

ill post mine in a few. im going to send ya a PM.

[teyber]

Mine is very similar to Jin's guide. 250 watt cartridge heater (next time will use two 200 or 150 watt ones), and a 128c thermal fuse placed to far from the load tester.(better then starting a fire i guess)
http://img401.imageshack.us/img401/9610/loadtester2oo3.jpg (http://imageshack.us)
http://img98.imageshack.us/img98/4757/copperinaluminumwn8.jpg (http://imageshack.us)
Rear- cut square in holdown and milled out load tester so it would stick.
http://img98.imageshack.us/img98/6573/finished2yx4.jpg (http://imageshack.us)
regards

[{.bLanK} GoD]

Study up on "Ohms Law" ;)
:spam:
P=VI helps too. Can't calculate power without that. ;)
:spam:
Actually you only need any 2 values to calculate the other 2 values using ohms law.Values are:

"P" power(wattage) "E" (voltage) "I" (amperage) "R" (resistance)
:spam:
2long4u;2856218']The thread is post your load testers.
I don't have one yet. I need to get my copper block back from my buddy.
:spam:
Probably the best solution IMO, PhilippF.
:spam:

My load tester.
250w heater cartridge inserted into Cu block.
Adjustment by 20-450w incandescent light dimmer between 70 and 230w.
Fluke Ammeter in line to read current, I have a table of amperage readings I work from to calculate wattage in 25w increments.
http://justchillin.co.nz/pics/2007%20x3%20Build/Load%20tester/My%20Load%20tester%20block%20honed.jpg
http://justchillin.co.nz/pics/2007%20x3%20Build/Load%20tester/My%20Load%20tester%20block%20wired.jpg
http://justchillin.co.nz/pics/2007%20x3%20Build/Load%20tester/My%20Load%20tester%20running%20@%20231w.jpg
http://justchillin.co.nz/pics/2007%20x3%20Build/Load%20tester/My%20Load%20tester%20running%20@%2075w.jpg

Just took a photo of it strapped to the cascade.
http://justchillin.co.nz/pics/Tools/THUMB_load%20tester.jpg (http://justchillin.co.nz/pics/Tools/load%20tester.jpg)

[lior307]

Philippf - what Resistors OHM - do you use (i saw TWO resistors)
How many Watt each ???
Also - is a 226W of TEC can be used somehow as a Load Tester ??

[godmod]

TEC is more expensive and less useful than resistors or cartridge heaters.

[PhilippF]

These two resistors are 1 Ohm each and are put in series. Euach one is a 50W type, which of course is meant for room temp. 350W is no problem at -25C.

Regards,

Philipp

[Duniek]

235W tester
http://omniserver.no-ip.org/duniek/DUMMY/1.JPG
http://omniserver.no-ip.org/duniek/DUMMY/3.JPG
http://omniserver.no-ip.org/duniek/DUMMY/5.JPG
http://omniserver.no-ip.org/duniek/DUMMY/6.JPG

[N3RO]

Duniek, you can adjust the power of this one?

What do you use to know the power? Some kill-a-watt meter?

[tim-]

n3ro:
you put it straight to your wallsocket, to know the power, use either a kill-a-watt or measure resistance.

[Duniek]

Duniek, you can adjust the power of this one?

What do you use to know the power? Some kill-a-watt meter?

I use 50W resistors but dunno what exactly resistance
but its good for 220V
if i have 230V then i have 235W heat on it

[piotres]

Mine - unique ? :eek:

I think nothing more simple than mine loadtesters ;-) .

http://www.members.lycos.co.uk/piotres2/majd/33.jpg

260W dummy made of 3x 50W resistors - I know they're overloaded much but they work without problems with sub-zero temperatures :D . 230V powered . Alu plate 10 mm thick .

http://www.members.lycos.co.uk/piotres2/majd/34.jpg


225W dummy made of 4x 50W resistors .230V powered . Alu plate 10 mm thick . That box is "cut-off" which should turn off dummy when I forget to switch it off after test and dummy is going to be very hot - it should turn off 230V when alu plate reach 70*C, unlucily it turn if off also when alu is very cold - I mean test on -100C evap cascade, it turns off power too :mad: . When I test SS with around -50C it's OK, safety cut-off can be turned ON, it not cut in such sub-zero temps . That's why I make ON/OFF switch on that safety device :) .

Thanks
Regards
Peter

[ruffus]

here some pics of what i use it is 2-150 watt heater cartridges in a copper block that is 3/4" thick x 2" x2" and a k-type temp probe and i hook it all up to a kill-a-watt meter here are some pics

[Nosfer@tu]

Nice work boys :D

Love it when you can go above the normal 235 or 250 watt :D

[toaster]

0-400W :)
http://www.extremecooling.net/index/e107_files/public/1206312026_423_FT0_img_3549.jpg

[kayl]

3x 75 ohms, With my 0-265v variac I have a varible load tester from 0-312w.

http://img503.imageshack.us/img503/9831/resistorskw2.jpg
http://img503.imageshack.us/img503/7923/resistorloadfarxu5.jpg
http://img266.imageshack.us/img266/2538/dsc01493ud3.jpg

[lior307]

The photos are great but - I'm not sure i understood this Load !
Can someone Post an Electrical wiring Scheme so i will understand better
How eXACKLY Did you Connected these ressistors to a 230V ???

I want to use this to Measure my Single Stage Power .

[godmod]

äh i dont think that there is ver much to explain...

~ o------[[[[[[[]]]]]]]]]------o ~

a resistor betwenn the two "poles" (phase and neutral).
Or if needed more than one resistor, then in parallel or in series

[bassie]

The photos are great but - I'm not sure i understood this Load !
Can someone Post an Electrical wiring Scheme so i will understand better
How eXACKLY Did you Connected these ressistors to a 230V ???

I want to use this to Measure my Single Stage Power .

Take 2 resistors, wire them in series and connect them directly to your 230V. THe formula to calculate the power is P=(u²)/r

The resistance of resistors in serie's = R[sub]t[sub]=R1+R2+etc.

If you use 2 100ohm resistors on 230V

Rt=100+100 = 200
P=(230²)/200, P=265W

If you want to calculate wich resistance you need for 100W the formula is R=U²/P

R=230²/100 R=530OHM

[godmod]

Mine - unique ?
I think nothing more simple than mine loadtesters ;-) .

260W dummy made of 3x 50W resistors - I know they're overloaded much but they work without problems with sub-zero temperatures :D . 230V powered . Alu plate 10 mm thick

225W dummy made of 4x 50W resistors .230V powered . Alu plate 10 mm thick . That box is "cut-off" which should turn off dummy when I forget to switch it off after test and dummy is going to be very hot - it should turn off 230V when alu plate reach 70*C, unlucily it turn if off also when alu is very cold - I mean test on -100C evap cascade, it turns off power too :mad: . When I test SS with around -50C it's OK, safety cut-off can be turned ON, it not cut in such sub-zero temps . That's why I make ON/OFF switch on that safety device.

Hello Peter, how much Ohms does each Resistor have and did you wire them in series or in parallel?

[kayl]

The photos are great but - I'm not sure i understood this Load !
Can someone Post an Electrical wiring Scheme so i will understand better
How eXACKLY Did you Connected these ressistors to a 230V ???

I want to use this to Measure my Single Stage Power .

in series between active and neutral, ground the load test as well with the earth wire.

http://img503.imageshack.us/img503/7923/resistorloadfarxu5.jpg

[piotres]

Hello Peter, how much Ohms does each Resistor have and did you wire them in series or in parallel?

In series, but I don't remeber resistance :( .

[killermiller]

Here is mine. I bought the block and heater cartridges from DetroitAC. The block is 1.5x1.5x.75 inches. There are 2 3/8 150w heater cartridges. I have a variac to control the voltage applied.

[Marvin]

My initial pics.
2 HC 75w at 220v
variac 2kva
need to find a copper bar....