Solar charge/controllers

You won't be using any stand-alone solar charge controllers if you have a hybrid or grid-tie inverter, these have their own in-built MPPT inputs instead. But if you are hooking up to an inverter/charger you will need to charge the battery bank directly using one or more of these units. They come in a wide range of applications. It is essential that their max short-circuit current (Isc) and max open-circuit voltage (Voc) ratings are not exceeded. 

With an arrangement with a single series string of eight 370w panels you will have a max Voc around 300v producing 11 or 12 amps under optimum conditions. The array max Voc must be below the controller rated max voltage under any temperature or irradiation conditions and therefore a 10-20% margin should be factored in where ambient temperatures can be very cold. Panels are more efficient in cooler conditions. The correct solar charge/controller for this configuration will have an input voltage rating of at least 400v, a max solar current rating above 12amps and a max charge current rating which will depend on the battery bank voltage (60amps for a 50v bank).  

The DC output charging voltage produced will normally be automatically matched to the voltage of your battery bank, otherwise it's set with its parameter settings. The charging configuration may be controlled from the inverter/charger's parameter settings or from settings on the charge/controller itself.