A 20W panel that is labeled as for a "12V" system will typically have a Voc (open circuit) of 22ish V, and a Vmp (maximum power voltage) of 18V.
Generally, one should not hook up a bare panel to a load, and the usual recommendation is charge controller and battery. I wonder about a large cap instead of a battery, enough to make the controller stable. I have a 20W (HQRP) panel and use a Genasun GV-5 MPPT charge controller and then charge about 100Ah of batteries. I have not tried the controller with no batteries. The anyvolt3 is an interesting concept for this application. MPPT controllers try different voltage/current combinations to find the one that's in-range for the DC-DC converter and results in maximal power. I have found that to be around 17.5-18V whenever I get more than 200 mA >From the system (sometimes I see 1.6A). The anyvolt3 is expecting a voltage source, it seems, and the datasheet seems to imply that. A panel is not a voltage source. So I really wonder what would happen. Has anyone put a high-speed scope on the input when hooked up to a panel? ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
