Uploaded March 2022 | Updated September 2026, 4 hours ago

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I've made several movies of how to charge RYOBI batteries by putting them in charge mode using a 1.2K Ohm resistor between the + and T1 connectors. Jim Shupe has figured out that you can put a RYOBI 40V battery into charge mode using a 300K Ohm resistor between the + and T1 connectors. This is great news because we can now directly connect a MPPT solar charge controller to the 40V batteries.

This video shows how to configure the MPPT solar controller ( youtu.be/xhLEnkzLj60 )

The 3D print files are located at:
* prusaprinters.org/prints/61098-ryobi-40v-pass-thru-charging-adapters/files
* thingiverse.com/thing:4803942

Things I used:
* RYOBI 40V Battery ( amzn.to/3YxzWOD )
* 100W Solar Panels ( amzn.to/3JvROC0 )
* Inexpensive MPPT Solar Boost Charge Controller ( amzn.to/3ig5e9j )
* Waterproof Genasun MPPT Solar Boost Charge Controller ( amzn.to/3Jn5dwu )

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