Hose testing, this is 1.5″ Goodyear EP Plicord Flexwing Black Nitrile Rubber fuel hose rated for 150PSI WP. It will work for water just fine from what I can tell… The small reinforcement fibers are some sort of synthetic fiber. The large spring type wires are stainless steel and allow for the extreme flexibility (4″ bend… Continue reading Hydroelectric Turbine Development
These 85x58x33mm cases can be inexpensively sourced from many locations. However I could find no data on the hole layout so here it is! Remember that the clear plastic lid has a smaller ID than the main part of the case as it overlaps in the seal area!! something to keep in mind if you… Continue reading Plastic Case 85x58x33mm KH-F19 Dimensions
I’d say it works well 🙂 very happy, using the ucglib graphics library. It has advantages compared to the adafruit library in rewriting data to the screen in such a way that avoids the entire line flashing on rewrite.
The following are large 3 lead MOV’s that include a thermal fuse – this fuse will prevent thermal runaway on short circuit failure mode. The 3 lead arrangement also allows an LED indicator light to notify when failure of the thermal fuse has occurred. $4 TMOV25SP115M – 28MM 20KA 170J 115VAC 150VDC – good for 150V… Continue reading Lightning Arresters, MOVs, Surge Suppression
V1 120.55 V1 avg 120.51 CT1 A 3.72 CT1 VA 448.61 CT1 W 357.18 avg 343.68 CT2 A 3.68 CT2 VA 443.41 CT2 W 354.12 avg 343.20 CT3 A 3.60 CT3 VA 434.26 CT3 W 347.32 avg 343.10 CT4 A 3.59 CT4 VA 432.64 CT4 W 345.86 avg 339.43 CT5 A 3.61 CT5 VA 434.80… Continue reading Testing Current Transformers
Cloud IOT Hosting / Storage Options Looked at in initial exploration of subject: Example: http://www.openhomeautomation.net/cloud-temperature-logger-esp8266/ Github for above project: http://github.com/openhomeautomation/esp8266-cloud http://dweet.io/ http://www.freeboard.io/ http://bsautner.github.io/com.nimbits/ – Desinged to be installed on local hardware like raspberry pi – is being maintained but does not seem to be highly used http://platformio.org/ https://temboo.com ESP EASY Firmware – The firmware option I am using… Continue reading Remote Power Monitoring system AC or DC current measurements
Quite often in a micro hydro system you may have a section of pipe that is not at a perfect downhill grade or even goes uphill – this can lead to air getting trapped in these sections and greatly restricting water flow. One way to deal with this problem that the irrigation industry has come… Continue reading Air Vacuum Relief Valve for Micro Hydro Electric Systems
I wanted to see if it was possible to modify this dual meter to accept a different shunt mv rating – suffice to say it is not without creating a very sensitive opamp circuit. The input resistors only serve to protect the input, the actual sensitivity divider network is internal to the IC chip and… Continue reading DC Power Meter 100A 100V Teardown