It sounds like your controller controls the AC? Maybe some kind of triac circuit to vary the watts fed to the heating elements. Not sure what the inverter would think about that. G-
If your controller controls load after the inverter that is ok.
You can cover the case of inverter failure with a back up C60 controller to protect the battery if the inverter fails. Normally the C60 will not dump and it must have its own dump load. There is no way that the C60 can be used to feed the inverter but I think you understand that.
Many have proposed using an inverter after a C60 in place of the dump resistor and that is a definite no go area.
If you want heat alone then this is not a clever scheme as heating controllers work best with turbine volts proportional to wind speed, but it is not much worse than a fixed voltage link at higher volts.
I know absolutely nothing about your turbine, but direct connection to heaters with suitable control may not be out of the question as it would most likely be working well over 24v at times when you are producing significant power. Cut in at 24v would likely give you 70 -80v at full load and line losses may not be that bad.
Flux[ Parent ]
If the elements are connected through relays, I don't expect the relays will last too long or be very reliable. But I don't like relays cycling very fast for long periods. SSRs would be better.
Might think about an adjustable LVD to shut the inverter down. Say 3~5 days with no wind with the inverter pulling X-amps, could put a world of hurt on the batteries before the inverter shut down at 21V. Plus the power the inverter uses during those times needs replaced, and that is power not used heating the water. G-[ Parent ]
The LVD is a good idea that I will employ, also I think I will use SSR's as the relays will probably not last too long. I had thought about direct connection but the controller side of it seemed difficult so I said I'd take the easier option in my opinion and use the AC side controlled inverter. If I feel brave in the future then I will try a direct connected heating wind turbine.
I know the answer to this but I need someone to tell me that in the long run its better to buy the pure sine wave inverter than the cheap MSW inverter? Its a difference of €250 versus €1000. But because its only being used for resistive elements the MSW might do the trick?[ Parent ]
I might even change the 500W element to 250W. Max load would be 1250W, then a 1500W inverter should handle it. Here, about 1500W is where inverters start to get expensive faster, in $/W. The savings may buy a TriStar? G-[ Parent ]
Choose your load correctly and a 1500W inverter should do the job easily.
