Best GTI for CHP

[jotec]

Hi,
I have now proved that the CHP works to my satisfaction with the Windsave inverters but as another gave up the ghost yesterday for no apparent reason it is time to get a good one.
I want an output of around 2kw it is a 3 phase rectified PMA (designe4d for a wind turbine) I am using with an output voltage that is around 300V DC, but I can alter that by changing the revs of the PMA.
What is the opinion of users as to the best one to go with? At present I am favouring the Windyboy as it has a good warranty.

I would also like opinions as to why the windsave inverters fail (Not just c**p design please). It has been suggested that they don't like working a near full output for long periods.
The symptoms of the fail are that they just stop, they are on and working and it is just as if a fuse has blown. There is mains in to the board but no life in the display. A different display makes no difference. It is likely just one component has given up but with no circuit diagram and my basic electronics it is going to be impossible to fix.
Dick

[ecogen]

I would also like opinions as to why the windsave inverters fail

They were exposed to Bongo syndrome related to pesky cyclic irregularity.

[knighty]

I think running them near full output all the time will shorten there lifespan quite a bit...

if I were you I'd go for a much bigger GTI than I needed, for 2kw continuous I'd look for a 3kw unit minimum.... and then probably add an extra fan to it to make sure it says cool !

from the other posts on here the Aurora inverters come very well recommended....

[HalcyonRichard]

Hi Dick,
           A good old TV repair man should have a good chance of a repair. The usual culprit(s) are any high voltage/high power components. Look for obvious burning or scorching. A simple check for short or open circuits with a meter will probably find something. If you have a working one then than can be used for comparison. Sometimes a transistor blowing can cause other components to fail. I have just repaired my daughters alarm clock. The circuit that slowly brightens a bulb had failed. I found the main transistor short circuit anothe one open circuit and the "protection" zener open circuit. I replaced all three and now have a happy daughter. You can fix 95% + without circuit diagrams.

Regards Richard

[jotec]

Thanks for that Richard,
I always believe things can be fixed but I have a (very) basic amount of knowledge and experience re electronics and feel that I am (past) at the limit with these. Am going to have a go tho and also see if I can fined someone with more knowledge to have a go. Much of the board is surface mount which makes it more difficult for me.
Dick

[Other-Power]

SMA offer a good warranty period of 5 years with there inverters and can be set up for constant voltage input.

[jotec]

Thanks for that Other-Power
I have gone for a second hand windyboy with 3 years warranty remaining. With a setup lead it has proved to fit the purpose well.
Dick