tag:blogger.com,1999:blog-16736699.post8613221008825745585..comments2024-02-01T16:41:23.163+00:00Comments on Sustainable Suburbia: Open Inverter - Part 6 - Thinking Allowed Ken Boakhttp://www.blogger.com/profile/01168707285621954181noreply@blogger.comBlogger7125tag:blogger.com,1999:blog-16736699.post-3860550051343108412015-10-13T08:55:36.386+01:002015-10-13T08:55:36.386+01:00Thanks Ken for the explanation.
(What I do not un...Thanks Ken for the explanation.<br /><br />(What I do not understand is why you want to use a boost converter with MPPT. The standard 250-300W solar panels with 60 or 72 cells have a usable output voltage range of 25-36V.)<br /><br />But now I will wait what happens next :-))<br /><br />BR, Jörg.<br />Anonymoushttps://www.blogger.com/profile/12255624979702080469noreply@blogger.comtag:blogger.com,1999:blog-16736699.post-17167106136019140052015-10-11T19:50:59.412+01:002015-10-11T19:50:59.412+01:00Jorg,
The plan is to use a boost converter combin...Jorg,<br /><br />The plan is to use a boost converter combined with peak power tracker, that ensures that the input voltage to the inverter is fairly constant.<br /><br />I hope to cover this in a later post.<br /><br /><br />KenKen Boakhttps://www.blogger.com/profile/01168707285621954181noreply@blogger.comtag:blogger.com,1999:blog-16736699.post-66249611095537528702015-10-11T13:51:39.054+01:002015-10-11T13:51:39.054+01:00If you use a transformer with a 24V to 240V transf...If you use a transformer with a 24V to 240V transformation ratio, what happens if your battery goes down to 20V (or even 18V) or up to 28V. What will be the output voltage? <br />Wouldn't it be better to use an 18V (or 20V) to 240V transformer and add some sort of output voltage regulation (or input voltage compensation)?<br /><br />BR, Jörg.Anonymoushttps://www.blogger.com/profile/12255624979702080469noreply@blogger.comtag:blogger.com,1999:blog-16736699.post-69978354789445922452015-10-08T12:47:56.807+01:002015-10-08T12:47:56.807+01:00You could also create a second board which could r...You could also create a second board which could replace the transformer. Leaving the first board for MMPT and creating the steady output. I wouldn't mind 2 AVR's at all. Even 16 AVR's would be okay too if it would do the trick. Case is, that a single toroidal transformer costs quite a bit of money, if stacked for bigger output, costs would go up like crazy. <br /><br />Regular inverters using transformers have been around for some time in the DIY domain, well designed high frequency switching inverters haven't. Be the first ;)Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-16736699.post-17116729615527681732015-10-07T08:58:12.534+01:002015-10-07T08:58:12.534+01:00Thanks Holla,
Unfortunately the TI design is some...Thanks Holla,<br /><br />Unfortunately the TI design is somewhat complex requiring specialist components and on-board high voltages, whereas the external transformer design is simpler - and in my opinion more accessible to the DIY community. All of the high voltages are handled by the transformer - and the highest voltage on the board is less than 48V - making it super safe.<br /><br />I was also put off by the $850 price tag of the development kit - and the requirement for a Piccolo DSP to control it.<br /><br />I accept that the proposed transformer method will not be as efficient, but the use of direct dc charging and powering of consumer equipment that can use dc will help reduce the inefficiencies of small switched mode chargers - thus helping achieve a greater overall efficiency form the limited wattage solar panel or battery system.<br /><br />This micro inverter is for use where there is no immediate alternative to powering by ac - and for small wattage devices.<br /><br />This series is as much an introduction to power conversion electronics, making it accessible for newcomers - and not aimed at achieving state of the art conversion techniques or efficiencies. Ken Boakhttps://www.blogger.com/profile/01168707285621954181noreply@blogger.comtag:blogger.com,1999:blog-16736699.post-41808545693205482622015-10-07T05:04:55.920+01:002015-10-07T05:04:55.920+01:00You may want to look closely at TI's microinve...You may want to look closely at TI's microinverter, <br /><br />http://www.ti.com/tool/TMDSSOLARUINVKIT<br /><br /><br />It runs 2 control loops, one for mppt and one for line frequency syncing using an intermediate 300v DC voltage. With this approach, you can skip that transformer , and it's more efficient.<br /><br />there's quite a bit written about the design in their docs.<br /><br />Take a look.<br /><br />Thanks for the project, very interesting.holla2040https://www.blogger.com/profile/06944456261554780078noreply@blogger.comtag:blogger.com,1999:blog-16736699.post-45289047871609377632015-10-07T05:03:00.035+01:002015-10-07T05:03:00.035+01:00You may want to look closely at TI's microinve...You may want to look closely at TI's microinverter, <br /><br />http://www.ti.com/tool/TMDSSOLARUINVKIT<br /><br /><br />It runs 2 control loops, one for mppt and one for line frequency syncing using an intermediate 300v DC voltage. With this approach, you can skip that transformer , and it's more efficient.<br /><br />there's quite a bit written about the design in their docs.<br /><br />Take a look.<br /><br />Thanks for the project, very interesting.holla2040https://www.blogger.com/profile/06944456261554780078noreply@blogger.com