Compo55

Hey @CE_Builds, welcome to the forum! Just to clarify before you go further — with a single MultiPlus-II you're not really doing a "parallel topology" as such, that term usually refers...

Compo55 | 1,203 posts | 🔋 Off-Grid Veteran Good points all round. One thing nobody's mentioned yet — have a look at your "Tail current" setting in VEConfigure.

Compo55 | 2,156 posts @BigAl31 One angle nobody's mentioned yet — factor in what you're actually running simultaneously, not just total daily consumption.

Good shout from @Turbo34 on the Cyrix. Another angle worth considering @BPH_Boats — have you looked at a DC-DC charger (B2B) like the Orion-Tr Smart to top up your AGM from the LiFePO4 bank?

Compo55 | Posts: 1,156 @Hamish1980 One thing worth adding that I haven't seen mentioned — cold temperatures actually increase your AGM's internal resistance, which means the battery can reach...

Compo55 | 847 posts | 🏕️ Off-Grid Narrowboat @CraigLamb worth mentioning that AGMs have a notoriously flat discharge curve compared to flooded lead-acid, which makes voltage-based SOC even less...

@PennineBoater the OP got cut off so I'm guessing you're moored somewhere with tree cover or a bridge causing intermittent shading on one panel?

Good shout from @Scouse12 and @MultiPlusNerd on the sensor placement — that's caught a few people out.

Great points from everyone above. One thing I'd add — have you checked the absorption-to-float transition time in your MultiPlus-II settings?