Can I add (1) 100 watt panel in series to this system?

[bruceearl]

My equipment Renogy 400 Watt 12 Volt Premium 4 Pcs 100W Panel+40A MPPT Charge Controller+ Bluetooth Module Fuse+ Mounting Z Brackets+Adaptor Kit +Tray Cables Set, 400W, Grid 12V Solar Power SystemRenogy 2000W Pure Sine Wave Inverter 12V DC to 120V AC Converter for Home, RV, Truck, Off-Grid Solar Power Inverter 12V to 110V with Built-in 5V/2.1A USB Port, AC Hardwire Port, Remote Controller LOSSIGY 12V Lifepo4 Battery 100Ah Lithium Iron Phosphate Battery Built in 100A BMS

 

[sunshine_eggo]

What is MPPT maximum input voltage?

What are Voc and Isc values of old panels and new panel?

 

[oneshotjon]

It sounds like I started with the same Renogy solar kit but use a different inverter. I added 2 additional 100w panels but run the whole thing in parallel.
What are you trying to achieve by running 5 panels in series?