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Excellent - Thank you. Leaning toward: Victron 250/60 and stay serial.

Only have 3 panels

Have 3 400w 48v panels. Want to charge 4 LI Batteries 12 volt in series-parallel to create a 24v system. Looks like if I go with panels in series the controllers jump to over $800 - is the best option to put panels in parallel to save money on the controller?

https://www.solarelectricsupply.com/q-cells-q-peak-duo-l-g7-2-400w-solar-panel Q CELLS Model Number Q.PEAK DUO L-G7.2 400 STC Rating 400.0 Watts PTC Rating 372.7 Open Circuit Voltage (Voc) 48.96 Volts Short Circuit Current (Isc) 10.19 Amps Frame Color Silver Origin USA...

So - for a starter backup system - to keep costs low. Go with a parallel configuration, which would require a controller for example: 100v and 40 amps ? EPEVER 40 Amp MPPT Solar Charge Controller 150V PV Input Negative Ground by SolarEpic Learn more...