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Originally Posted by Cathar
Total pump power draw would be ~20W or so, so given a step-up transformer efficiency of ~80%, we're talking about a 25W power draw from a PSU 12v rail, which is nothing.
Yeah, the easiest way to do it using existing equipment is to use a step-up transformer and an existing Iwaki RD-20. Would be nice if the transformer were not needed though.
Depends - are we interested in getting such pumps made up and done right and running off a 12v rail, or are we just looking to skirt around the limitations and put together an "ideal pumping characteristics" kit?
Either way, it'd probably cost the end-user about the same. i.e. existing pump + transformer, as opposed to custom pump production run rewired for 12v native.
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Well here is what I found out this week. I talked to an engineer at Iwaki and he said they will most likely NOT ever create a 12vdc model. It is a small market to them relative to the other pumps they sell let alone the design costs involved.
So, I have a long time friend that owns a large water purification manufacturing plant and they happen to be an Iwaki dealer. If the volume is high enough (100) I can probably get these (RD-30) down to about $210 each maybe more if we get higher interest. But as stated before that's a lot of cash outlay. I'll be testing some 12v stepper transformers once I receive my test RD-30. I have also ordered an RD-20 but it is back ordered for 4 weeks.
Cathar, given this situation what voltage do you see would be ideal for a stock RD-20? 22vdc?