Iwaki Rd-20 / Rd-30 Pricing: Ordering Now Closed

[LazyBum]

How about this one http://www.sidewindercomputers.com/me125vand12v.html It is pretty close to what is needed I think, the big problem is there is not much adjustment range.

[nikhsub1]

Agreed - but which model? The S145-15 could handle the startup current load of the RD-20, and maybe the RD-30, but has a max output of 15V (+/- 10% = 1.5V). The S-145-24 might have issues with the startup load of either (nominal 6A) and might not be able to undervolt the pump to 17-18V (24V +/- 10% > 20V).

Or am I overly concerned about the pump startup current demands or reading the specifications incorrectly?

berknip, you need the 24V model. The 145 should have no startup issues at all.

[berknip]

Thanks nikhsub1, and not to hijack a thread but I've also PM'd/responded to the thread about desiring one of those ultra-sweet reservoirs of yours! Great stuff man - hope I can still get one.

[fareastgq]

the coverter is fine if you have a good psu and want it to turn on when your computer turns on or are limited to space. I never shut my comp off though and rebooting doesn't turn the pump off. Having ac to dc is a good idea though to not strain the psu if your is dinky. MJgent runs his with a converter fine and mine's ok too. It is possible that you could strain the psu and kill it. So I guess when it comes down to it, it's up to you to decide which way you want to go.

Edit : I just realized my comment might be misleading, to clarify, I am NOT using that converter that I linked to. I am using this converter from powerstream.com

PST-P006-Universal
82 watts rated for 5 amps

[epion2985]

They will not run much below 16-17v or so.

So at the lowest around 17v will the RD20 and RD30 run about the same as far as power drain, heat dump, flow and head?

Are there any negative effects to undervolting them or is it perfectly fine for the pumps?

[creidiki]

I say, ive found some for those in the UK who want a converter:

http://www.thepowerstore.co.uk/types.asp?PID=2

[nikhsub1]

So at the lowest around 17v will the RD20 and RD30 run about the same as far as power drain, heat dump, flow and head?

Are there any negative effects to undervolting them or is it perfectly fine for the pumps?

They actually may run at lower voltage, the issue will be at what voltage will they start up at? Example; you start the pump at 18v then get it down to say 12v (can't go this low on my Meanwell), you turn the pump off at 12v. Will the pump restart with 12v? That is the question. To the first question the answer is simply no. The RD-30 will outperform (head + flow) the 20 at all comparable voltages. Heat dump will obviously be more with the 30 at all comparable voltages, how much I do not know.

Undervolting the pump will have only positive effects on MTBF, sort of like underclocking your CPU.

[MaxxxRacer]

Undervolting the pump will have only positive effects on MTBF, sort of like underclocking your CPU.

That right there makes the 30 more attractive.. are they the same size. i dont recall.

[creidiki]

Yup, same size.

[Sneaky]

hey nik - j/w, which meanwell are you using for your RD-30?

[Jester FPS]

fareastgq, which converter are you running on your rd-20?

and which ac dc converter do you recommend?

[fareastgq]

Ok, guys, just an update, some of you have expressed interest in ordering with credit card paypal. I don't have a problem with that except you have to pick up the paypal fees (and no it's not illegal because I'm making 0 on it ). So credit card pre-pay goes like this :

RD-20 = $244
RD-30 = $255.50

to: Fareastgq@hotmail.com

If you send CC paypal to the non CC account I will deny it, Likewise, if you send non CC paypal to the CC addy, I will deny it also. sorry guys.

[[XC] MarioMaster]

Ok, guys, just an update, some of you have expressed interest in ordering with credit card paypal. I don't have a problem with that except you have to pick up the paypal fees (and no it's not illegal because I'm making 0 on it ). So credit card pre-pay goes like this :

RD-20 = $244
RD-30 = $255.50

to: Fareastgq@hotmail.com

If you send CC paypal to the non CC account I will deny it, Likewise, if you send non CC paypal to the CC addy, I will deny it also. sorry guys.

$250 for a pump? I've been getting along fine with my ViaAqua 370gph pump for $25 off ebay. And I don't want to invoke a "which flow rate is better" argument, just seems like a lot of money to me for a pump

[epion2985]

They actually may run at lower voltage, the issue will be at what voltage will they start up at? Example; you start the pump at 18v then get it down to say 12v (can't go this low on my Meanwell), you turn the pump off at 12v. Will the pump restart with 12v? That is the question. To the first question the answer is simply no. The RD-30 will outperform (head + flow) the 20 at all comparable voltages. Heat dump will obviously be more with the 30 at all comparable voltages, how much I do not know.

Undervolting the pump will have only positive effects on MTBF, sort of like underclocking your CPU.

Well my biggest worry is the heat dump from the 30 over the 20. I will be undervolting wich ever I would have gotter.

I decided to go for the 30 because I can undervold it anyway and the price difference is tiny. But now I am worried if I undervolt the 30 to the point where it would run like the 20 under 20v it will put put out more heat then the 20 under 20v which would be running just as hard as the 30 under Xv. Or will it?

[nikhsub1]

hey nik - j/w, which meanwell are you using for your RD-30?

S-240-24

[nikhsub1]

Well my biggest worry is the heat dump from the 30 over the 20. I will be undervolting wich ever I would have gotter.

I decided to go for the 30 because I can undervold it anyway and the price difference is tiny. But now I am worried if I undervolt the 30 to the point where it would run like the 20 under 20v it will put put out more heat then the 20 under 20v which would be running just as hard as the 30 under Xv. Or will it?

Oh man, stop worrying! Im telling you the 30 is a better choice. But, don't believe me.

[Danger30Q]

Just read this whole thread through and I must say most people seem confused between the RD-20 or RD-30. I recommend that you listen to nikhsub1 and just buy the RD-30 for the extra $15. He says it's a better pump and that's final.

The real question is which converter or MeanWell PSU to use. I just ordered a RD-20 from a local distributor and I'm definintely not getting it as cheap as fareastgq is through his batch order. I think I'm going with the MeanWell S-145-24 and undervolt to about 19-21V. I also have the same Zippy 700W that fareastgq has but it's a $250 PSU that I'd much rather protect than a sub-$50 Meanwell. Plus, I'm running X1900's in crossfire and I could probably dedicate a PSU just to those monster hogs alone.

I honestly think that the RD-20 is overkill for just about all of us so no matter which pump you choose you're still getting a monster.

[Sneaky]

S-240-24

thanks - that was the PSU that i've been looking at so far

would you be able to link me to where you got it from? (cheapest i can find is $108.20 so far)

[Danger30Q]

Anyone know of a reputable online dealer that sells the meanwell S-145-24? I just did a google search on this PSU and all I got was some shady-looking businesses.

[Sneaky]

S-150-24 is available here:

http://www.power-factor-1st.com/shop...ies/s-150.html

[nikhsub1]

S-150-24 is available here:

http://www.power-factor-1st.com/shop...ies/s-150.html

sneaky if I were to get another 24v PSU for the RD, it would be the one you just linked...

[Danger30Q]

Seems like the Meanwell S-145 series is being phased out by the S-150.

http://www.trcelectronics.com/Meanwe...ies-s150.shtml

Be cautious when finding an online retailer. I've seen the S-145-24 being sold as low as $34 all the way up to $88. I've seen the S-150 from $40 all the way up to $136!

I believe the only difference between the S-145 and the S-150 is the 5W increase. The S-145-24 is 6.0A while the S-150-24 is 6.5A.

trcelectronics seems to have overall good prices and a decent looking website. I'm thinking I will buy from their tonight.

[Sneaky]

are you sure that startup for the pump on a daily basis would be safe for the S-150-24 to handle with only a 6.5a constant output? (i don't let my machine run 24/7)


i might just get the S-240-24 to be safe in the end... its not like theres space issues when you have a MM U2-UFO

[Danger30Q]

Yeah, the S-150-24 only 6.5A current may not be enough for the 8A needed for startup. I just found the S-210-24 which is about $65 compared to the $95 of the S-240-24. The S-210-24 supplies 8.8A of current.

I know the manual says to not use the pump for frequent on/off but I just don't like the idea of having the pump constantly pumping tons of gallons while I don't even need it. With the extreme power these pumps have, you just never know when something might start leaking and by the time you notice it your place is flooded.

I think I'm going to take my chances with turning the pump on and off when I need it. It's not a 24/7 always-on rig but maybe is on for 2-3 hours per day.

[Sneaky]

I know the manual says to not use the pump for frequent on/off but I just don't like the idea of having the pump constantly pumping tons of gallons while I don't even need it. With the extreme power these pumps have, you just never know when something might start leaking and by the time you notice it your place is flooded.

I think I'm going to take my chances with turning the pump on and off when I need it. It's not a 24/7 always-on rig but maybe is on for 2-3 hours per day.

yea - i don't think that daily startup of the pump is actually gonna do serious damage to it - maybe decrease the MTBF, but hell, knowing Iwakis, they're freakin tanks and shouldn't have any issues


i've yet to see someone kill a pump from turning it on & off on a regular basis