tag:blogger.com,1999:blog-33573016.post7801334247605822700..comments2024-02-11T02:24:22.330-06:00Comments on Nonbovine Ruminations: Solar powered stationAnonymoushttp://www.blogger.com/profile/04107127399494404366noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-33573016.post-39233719302710366342008-10-11T11:08:00.000-05:002008-10-11T11:08:00.000-05:00try this, http://www.harborfreight.com/cpi/ctaf/di...try this, <BR/><BR/>http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=91325<BR/><BR/>you might need to do some tinkering if you want to control the point at which it starts charging.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-33573016.post-63379708030186816462008-10-10T13:04:00.000-05:002008-10-10T13:04:00.000-05:00OK, here's a simple switcher;http://www.elecfree.c...OK, here's a simple switcher;<BR/><BR/>http://www.elecfree.com/circuit/power-supply/switching-power-supply-regulator-with-LM2576/<BR/><BR/>you'd probably want something like this to eliminate bulky power transformers;<BR/>http://www.powerint.com/sites/default/files/PDFFiles/top221-227.pdf<BR/><BR/>Or, you could just buy a battery charger and run it through your timer/charge circuit.<BR/><BR/>PS, My AARL handbook has a switcher circuit, but its pretty complicated - variable output at 40 amps.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-33573016.post-43261591480218209632008-10-10T12:43:00.000-05:002008-10-10T12:43:00.000-05:00Just shooting off at the mouth here ... howabout a...Just shooting off at the mouth here ... howabout a switch that triggers when the battery drops below a certain voltage. The switch triggers a 10 minute charging boost. <BR/><BR/>It's a good design project, you can probably do it all digitally with a few cheap TTL parts. Rectify 110V ac, use an astable timing circuit ~100 Khz running a power fet into an appropriately sized inductor, and some caps on the output. <BR/><BR/>There are some online calculators for switching power supplies (too lazy to find the links right now myself).Anonymousnoreply@blogger.com