I am most of the time connected to shore power, the inverter keeping the batteries charged in float mode. Every morning, the MPPT starts a change cycle in bulk mode. Am I over charging the batteries?
asked
Is it good for the batteries to keep them fully charged all the time
@MichelBeausejour, the MPPT will always start in bulk; that's simply the way it works. Once it sees that your batteries aren't taking current (because your inverter/charger has been keeping them topped off), it will switch to its absorption/float cycles. So long as the charge voltages of the MPPT are set appropriately to your battery manufacturer's recommended charge specifications, you don't need to be concerned about overcharging them.
LFP banks are of course more susceptible to overcharge than FLA or AGM banks, so if you're running LFP, make sure to double-check your manufacturer's specific recommended charge profile and then, just to be safe, I would set the charge voltages in your MPPT a tenth or so of a volt under the recommended charge profile.
