These little units seem to work fine. However be aware that they produce no output untli the input is about 18v. That means that if your solar panel is not producing over 18v there will be no battery charging going on at all. Above 18v they produce a steady 13.6v. I don't know how much current they can supply under best conditions. My solar panel only provided 18v or more under very bright conditions so I put a Boost module between the solar panel and the MPPT unit. That boosted the voltage up to about 24 v even with quite low solar panel output so I got some charging under most conditions.

These little units seem to work fine. However be aware that they produce no output untli the input is about 18v. That means that if your solar panel is not producing over 18v there will be no battery charging going on at all. Above 18v they produce a steady 13.6v. I don't know how much current they can supply under best conditions. My solar panel only provided 18v or more under very bright conditions so I put a Boost module between the solar panel and the MPPT unit. That boosted the voltage up to about 24 v even with quite low solar panel output so I got some charging under most conditions.

These little units seem to work fine. However be aware that they produce no output untli the input is about 18v. That means that if your solar panel is not producing over 18v there will be no battery charging going on at all. Above 18v they produce a steady 13.6v. I don't know how much current they can supply under best conditions. My solar panel only provided 18v or more under very bright conditions so I put a Boost module between the solar panel and the MPPT unit. That boosted the voltage up to about 24 v even with quite low solar panel output so I got some charging under most conditions.

under test

under test

under test