Dual battery setup for off grid solar

Author	Message
Solar Mike Guru Joined: 08/02/2015 Location: New Zealand Posts: 1255	Posted: 01:30am 22 Jun 2026         Godoh said   Hi Mike I have another query on your Lead Carbon and LifePo4 setup. So will the charger voltages that my regulators are set for ( 28.8 volts) damage or undercharge the Lithium batteries. thanks Pete Lifepo4 cells top bulk voltage is 3.6v, generally however its good practice to only go to 3.5v/cell or 28 volts, this voltage suits L.Carbon as at 20°C that is also its max bulk voltage. If your charger is accurate and never exceeds 3.6/cell, they will work ok, I limit our CV period following bulk to 2 hours in the combined bank; if it was a Lifepo4 only bank, I limit the CV period to however long it takes for the BMS to achieve cell balance, usually 20 minutes or less. Mike