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LiFePO4 combiner:




I've got a 100AH LiFePO4 battery that I would like to use more, but I have no easy way to patch it into my
solar grid because it runs at a slightly higher voltage. I recently picked up a medium power MPPT
controller for lipo and now need to look at combining panels for efficient use. The controller is rated 300
watts, and has a panel max of 50 volts. A series-parallel combination of four 100w panels should be a perfect
match, with an unloaded Voc of 48 volts and a max production of 300w. This battery has been getting used with
a satelite station that's too far away to be tied directly into the main grid anyway, so it makes sense for it
to be on its own dedicated solar.

I also want to try my hand with silicon adhesive (instead of my usual hot melt glue) to waterproof the meter.
I don't know if it will work better, worse, or about the same. My main reason for trying this is I'm a bit
worried about using hot glue on the exposed electronics around the front of the meter as it appears behind the
meter bezel. Also I don't have to worry so much about the glue shrinking when it cools, since the silicon
should maintain some flexibility after curing. Plus its easier to remove if I want to redesign or recycle the
parts later.


1 construction

2 waterproofing

2022.09.05 LiFePO4 solar charging (in test sessions)


LiFePO4 150w controller (in 1 low power controllers)


LiFePO4 300w controller (in 1 low power controllers)

power display 100v 20a ($15 at Amazon)


LiFePO4 combiner schematic:



highest resolution images
last updated 02/16/2025 at 16:28:12 by make_www_index.command version 2025.02.14.A