Jon, You are technically correct but both are equal if you are reaching a full charge because both systems taper off to a float voltage at full charge. Also MPPT only justifies it's higher cost if you never fully charge your batteries and your solar panels can produce a voltage significantly higher than your battery voltage, for example if your batteries are 12V and your wired-in-series solar panels are 36 volts. This will almost never be the case with a Vanagon 12V system. Thanks, Tom Hargrave www.kegkits.com www.stir-plate.com www.towercooler.com www.grow-sun.com www.raspberryproject.com http://goo.gl/niRzVw -----Original Message----- From: Vanagon Mailing List [mailto:vanagon@GERRY.VANAGON.COM] On Behalf Of Jon VO Sent: Friday, May 29, 2015 8:39 AM To: vanagon@GERRY.VANAGON.COM Subject: Re: Solar panel question John, The different panels will have a somewhat different I to V curve, and thus the maximum power point for each may be a bit different. Depending on the MPPT controller, this may mean a reduction in power transfer efficiency, but should still charge the battery. Some MPPT controllers generate a particular I to V curve for the attached panels, by sampling over time and various light conditions. Still better than a straight PWM approach. Jon
On 5/28/2015 8:08 PM, J B wrote: > The initial test run seemed to work great and pulled in over 10amps > during peak sunshine ----- No virus found in this message. Checked by AVG - www.avg.com Version: 2015.0.5941 / Virus Database: 4347/9851 - Release Date: 05/23/15 |
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