Sebastian Köln wrote:
When using 24V, you can still use your 12V inverters by at the cost of caution to balance the two banks. This would mean to measure them all the time and use the inverter of the bank that has more energy left…
For a single string 1,557 AH Bank @100 Hr. rate, you will need 3 of the 4KS21P (4-KS21P) for a 12 Volt system, 6 of the 4KS21P (4-KS-21P) for a 24 Volt system and 12 of the 4KS21P (4-KS-21P) for a 48 volt system.
For a 12V string, you'll need 3 of the 4KS21P (4V X 3 batteries = 12V) and you'll get a capacity of 19,618 Watt hours based on the 100hr rate. For a 24V string, you'll need six of these batteries (4V X 6 batteries = 24V) and you'll get a capacity of 39,236 Watt hours at the 100hr rate. For a 48V string, you'll need twelve of these batteries and you'll get a capacity of 78,472 Watt hours (100hr rate).