![]() ![]() Using anything that would be flexing or mounted on canvas or any temporary install that had to be removed for any reason and have the panels on 24/7 and had seen so many solar panels on so many different sailboats and the ones that were mounted on some kind of strong frame so would not get beat up or flex.Īnd so mounting on the Hunters arch was a no brainer and nice and strongĪnd would handle any kind of weather or wind and not worry when the boat I wanted to use solid solar panels mounted to the boat with out Once out of bulk an MPPT controller simply begins a PWM mode to match current to the battery to maintain the absorption voltage without going above it. There is no boost once your batteries hit absorption voltage because instead of the array & controller deciding how much current it can supply to the bank the battery is now in control telling the controller how much current it can accept so as not to over-shoot the voltage limit. To sum it up simply once your batteries hit absorption voltage your MPPT controller essentially becomes a PWM controller pulsing on and off to not over shoot target voltage. #2 You dealer clearly does not understand how these devices work. We must remember is only a boost going on when MPPT is in bulk mode and on sailboats, with deeply cycle banks, we are in bulk most of the time with solar, which means the MPPT is in boost mode most of the time. I try to use 24V panels when I can but it is not always possible. If you bump to 24V panels you will pick up some additional gains early in the day and late in the day but most still use 12V nominal panels. In Northern areas our panels heat up less than they do in the South and we can still get decent gains, even with 18V panels. It relies on the voltage spread between the panel and the battery to work. MPPT uses excess panel voltage and converts it to usable current. I spoke with the blue sky dealer here in Ontario this morning and he tried to steer me away from MPPT controls, saying that with a simple 12v to 12v system like mine a PWM would be better as I wouldn't gain much from MPPT (as they are more efficient with a 12 V to 24 V system) and the PWM pulse system would help to keep my battery plates cleaner ? I hadn't heard that before.Ĭlick to expand#1 You will have gains over PWM with MPPT in the 15-20% range even with 12V nominal panels. At this point I am leaning toward the Blue Sky 3000i 12v/30amp MPPT which retails here in Ontario for $319 CAD. The blue sky 2512 MPPT unit along with a optional remote display would cost $474. panel-board which would add another $200+ to the install. In addition I would also possible need a remote display at the nav. Thanks for the input, the Tri-Star 60amp PWM unit as suggested is a great unit however at 11" high, 5" wide and 3" deep is quite large along with the cabling and air space it would need, installed in the lazarette close to the batteries becomes an issue when storing sails, cushions ect. ![]()
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