I'm setting up a small off-grid solar array for my shed in New York, which faces pretty much due south. Currently, I have two 100-watt panels, but due to some tree shading, I only get around 150+ watts from about 10:30 AM to 3 PM during sunny days in April. I'm using an EcoFlow River 2 Pro for about 650 Ah of storage, but I'm not a fan of its inconsistent battery management needing regular recalibrations. Plus, its inverter has a high vampire drain, so I'm considering an upgrade.
I've got two more 100-watt panels of a different brand that I'd like to add. Should I install them flat on top of the shed for more direct sunlight, or on the sides to catch more sun in the winter when it's lower in the sky? I'm also thinking about switching to two 6V, 220 amp-hour AGM batteries with a Victron BMS for charging and an inverter. My daily power usage is minimal—mostly for cameras, motion detection spotlights, some cordless tools, and occasionally lights, music, and power tools when I'm in the shed for a few hours.
2 Answers
Adding panels on the roof could maximize your input when the sun is at its highest. You could also consider mounting them on the sides for winter efficiency. Just ensure you wire them in parallel with your existing setup to maintain the voltage. And your idea to switch to AGM batteries is good, but just keep in mind the potential for upgrading later to something like LFP.
I wouldn't recommend going with AGM batteries anymore; lithium iron phosphate (LFP) is a much better choice now. They offer longer life and better performance overall. You might spend a bit more initially, but it pays off in the long run!
Yeah, LFP batteries are becoming the standard because they last longer and need less maintenance. Definitely something to think about!
I agree! Mounting on the roof makes sense, but don’t neglect the sides if you want better winter performance. Always good to have options!