So you are saying that the extra volts goes to more amps for charging?It's magic
An MPPT controller will take the power (watts) from the panels and convert into the charge voltage and corresponding amps. The incoming voltage/amps is largely irrelevant as long as the incoming voltage is at least 1V-5V higher than the charge voltage.Since a panel puts out more volts than the battery is rated at ( 18v vs. 12.7v ) does the mppt controller take those extra volts and make it into more amps going into the battery during the charge cycle?
Thanks. So I should buy panels that have a high Vmp number based on the same Wattages?Simple answer is yes.
What is Maximum Power Point Tracking (MPPT)
An MPPT, or maximum power point tracker is an electronic DC to DC converter that optimizes the match between the solar array (PV panels), and the battery bank or utility grid. To put it simply, they convert a higher voltage DC output from solar panels (andwww.solar-electric.com
Not necessarily. You can put panels in series to increase the voltage. You just can't allow the combined Voc, adjusted for colder temperatures, be higher than the max PV input voltage rating of the charge controller.So I should buy panels that have a high Vmp number based on the same Wattages?
I want to use 2 100W panels in paralle on a 12v system. The HQST panels at 100W have a Vmp at 20.3 each.Not necessarily. You can put panels in series to increase the voltage. You just can't allow the combined Voc, adjusted for colder temperatures, be higher than the max PV input voltage rating of the charge controller.
They would be fine in parallel.I want to use 2 100W panels in paralle on a 12v system. The HQST panels at 100W have a Vmp at 20.3 each.
What would happen is that even with the raw solar connected directly to the battery, the battery as a load would drag the voltage of the panel down to what the battery wants to charge at. So, if you connected the panel to a drained battery, the voltage would drop from 20V to ~12.0V. As the battery becomes more and more charged, the voltage will rise to around 14.4V or so.I want to use 2 100W panels in paralle on a 12v system. The HQST panels at 100W have a Vmp at 20.3 each.