How many new EVSEs can be added to a service with 220 amperes of non-continuous load and 172 amperes of continuous load if each EVSE draws 32 amperes?

To determine how many new Electric Vehicle Supply Equipment (EVSE) units can be added to a service without exceeding its capacity, you must consider the total available capacity after accounting for the existing continuous loads.

First, you start with the total service capacity of 220 amperes. From this, you need to subtract the continuous load of 172 amperes. Continuous loads must be carefully calculated to ensure they do not overload the service. Here, the calculation would be:

220 amperes (total service capacity) - 172 amperes (continuous load) = 48 amperes available for additional EVSE units.

Each EVSE draws 32 amperes. To find out how many EVSEs can be added, you divide the available amperage by the amperage draw of each EVSE:

48 amperes (available) ÷ 32 amperes (draw per EVSE) = 1.5.

Since you cannot install a fraction of an EVSE, you can round down to 1. This means you can only add one additional EVSE based on the available capacity.

However, to make sure that the system can handle intermittent usage and not just continuous loads, we consider that since the existing continuous load situation uses most of