Brushless Posted July 13, 2017 Share Posted July 13, 2017 I have 4 x 10.4Ah (41.6Ah) 6S LiPo batteries from a obsolete drone project. Min/Max voltages are 21V/25.2V and the charger should normally be CC/CV. Problem is most solar chargers are meant for Pb batts and thus have different termination voltages. However, it would be great to use these for a small solar system rather than just have them sitting around getting old. I haven't seen any SCC's in SA for lithium batts, but there are a few places across the ponds that offer solar chargers with a lithium option. The DoD for lithium's is 80% so better than most Pb based batts. Anyone using lithium batts here? Quote Link to comment Share on other sites More sharing options...
Chris Hobson Posted July 13, 2017 Share Posted July 13, 2017 1 hour ago, Graham said: I have 4 x 10.4Ah (41.6Ah) 6S LiPo batteries from a obsolete drone project. Min/Max voltages are 21V/25.2V and the charger should normally be CC/CV. Problem is most solar chargers are meant for Pb batts and thus have different termination voltages. I know that the Aussie Li ion users set bulk and float to the same voltage thereby terminating charging. Quote Link to comment Share on other sites More sharing options...
AndewJ Posted July 13, 2017 Share Posted July 13, 2017 2 hours ago, Graham said: I have 4 x 10.4Ah (41.6Ah) 6S LiPo batteries from a obsolete drone project. Min/Max voltages are 21V/25.2V and the charger should normally be CC/CV. Problem is most solar chargers are meant for Pb batts and thus have different termination voltages. However, it would be great to use these for a small solar system rather than just have them sitting around getting old. I haven't seen any SCC's in SA for lithium batts, but there are a few places across the ponds that offer solar chargers with a lithium option. The DoD for lithium's is 80% so better than most Pb based batts. Anyone using lithium batts here? I have a DJI phantom charge that works from a car's cigarette socket. Connect a 10W or 20W solar panel directly to it and it will charge the lithium batteries. Quote Link to comment Share on other sites More sharing options...
Guest Posted July 13, 2017 Share Posted July 13, 2017 3 hours ago, Graham said: Problem is most solar chargers are meant for Pb batts and thus have different termination voltages. Victron 75/15 or 75/10 MPPT's are quite adjustable on just about all settings. And cheap. https://www.victronenergy.com/solar-charge-controllers/mppt7510 Quote Link to comment Share on other sites More sharing options...
Brushless Posted October 13, 2017 Author Share Posted October 13, 2017 I have a Victron 75/15 but not the configuration cable or software, so not sure whether or not it can charge lithium batts natively. I have solved my issue by making up some 7S packs of the lithium cells which then have then very similar min and max voltages as PbAc's - 21.7V to 29.4V. These packs work great especially as one can use almost all the energy in the battery rather than the 50% one can get from PbAc's Quote Link to comment Share on other sites More sharing options...
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