These nominal 250W panels actually vary in voltage from about 24-30V and outputs of 225W to 270W for the same roughly 55"x39" panel size. Since the charge voltage for a 48V FLA bank tops out at about 57V in the final phase of charging I would be sure to pick a panel that is closer to 30V.
The Flexmax80 charge controller I am using recommends a minimum 60 Volt input for a 48V battery bank so if your panel has a 24V open circuit voltage you'll actually need to string 3 of them together in series to get the required voltage. While this will work fine, I think it's better to use two 30V panels. Panels in series are more susceptible to greater losses from partial shading and working with an integral of 3 panels in series to make up your array can be more problematic.
These voltage numbers are specific to FLA and are a little different if you're charging AGMs or LiIon but I don't know what those values are.
Carter
On Friday, January 24, 2014 9:49 AM, "stmbtwle@yahoo.com" <stmbtwle@yahoo.com> wrote:
I agree with using the "24v" 250w panels mentioned as they are a lot less expensive per watt than 12v panels. Connecting 2 in series will get you the 48v you're looking for to charge your propulsion batteries.
To run the 12v accessories I'd have a 12v "house" battery and charge it from the 48v system using a 48v-12v charge controller.
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