powerspout tripping, advice anyone?

Hi all,

A recent problem has developed that i cant quite get to the bottom of. One of the turbines will not hold its power output. The water pressure remains good and there is no obstruction etc at the jets, so i feel it must be electrical. After 20mins of being on the turbine just stops generating and must be tripping to heater. There is no fault shown on sunnyboy and the other turbine is operating as normal. An inspection revealed damp conditions which i dried up and also some excess grease turned to hard resin on the copper coils, but cleaning up has failed to resolve.

Any advice, thoughts welcomed on this, many thanks

Powerspout update

Still generating strongly, though now down to 1 turbine through summer months. Thought about changing the nozzle size, but dont think the difference will be that significant. The power output is slightly down from what it once was per turbine, now about 440W, whereas about 500W was possible initially. I think this may be signs of bearings beginning to need changed, but reluctant to do overhaul until the output drops more significantly. noise been an issue, due to closeness to house (approx 50m), and outside hut reads about 65db, but it seems to be the nature of the frequency that carries the sound, like a constant hum in background. Have severely insulated the internals of the shed with noise insulation foam, polystyrene and planning to use more expanding foam between floor and ground. Additionally, created log stack to act as wall between house, but still the sound persists at low level. Anyone, got any good ideas, would be interested to hear. The other idea was to try create some background noise off the burn with a small waterfall or something…

Update Feb 2014

Project going strong, with one main fundamental improvement, have removed coanda type intake cylinders which seemed to be aerating the water and causing shutdown after a few days. Since this improvement and fine tuning of pipe levels the turbine have produced steadily for months, output overall is now 3000+ units (since Oct 2012) but the improvement was only made approx oct 2013.

Other improvements were to insulate the air vents and increase the pool height.

Very dry… but working now for 3 weeks straight!

There has been an unbelieveable lack of rain for the last 3 weeks, but nevertheless we have had 1 jet (285W) running for 20 days with no reduction in power. One of the main solutions to our air bleed was that the air bleed valves reverse and suck air in when air is allowed to build up (e.g. if you are running two jets when there is only water for one and thus the head of water above intake is less than the requiref min about 0.4m). This is very annoying as overnight the system can lose all pressure. However, a simple one way aquarium pump valve (£2 off ebay) and a small piece of 8mm plastic pipe fitted to top of honeywell air vents seems to solve the problem. The re structure of the dam also helped a great deal, as we increased the head of water above pipe intake nicely



Finally some joy

Feel we have cracked air locking issues now having done extensive re working of the intake design and raising the whole dam. To make sure the pipe is not running horizontal in first 5m and that there is at least 40cm of water from surface to intake. After much trial and error have also installed 2 x honeywell ea122 air vents at the section of pipe that seems to lock out. They are bleeding sufficient air slowly to stop build up and we are getting the power output consistant for several days

air bleeding

having some difficulty with a build up of air in the pipes which leads to them being locked out after about 2 days and they need reset, by turning off, waiting an hour then bleeding air out for like 3 hours. Been looking into check valves or air bleed valves, but can’t find any that would work at low pressure and only allow air not water to bleed. Also been drilling 3 small holes then sealing with self tapping screws and ptfe tape to find the best location. It seems you need a least  a few metres of head to allow a sufficient jet of water to come out the hole you have drilled, otherwise once the turbines are running it has an negative effect by sucking air in and equalising out the system, thus locking the pipes out much quicker.

I am looking at these at the minute to trial, but open to any suggestions or links found online of solutions, please!?