OK, I've discovered that there are different OIDs for a "single" bank PDU (ie APC 7831) compared to "multi" bank PDU (ie APC 7802).
I've created two separate host templates for each of these models / types. I'm betting they will work for other similar models.
Firmware on network management card is 3.5.6 and firmware on the PDUs is 3.5.5.
Here are the updated OIDs:
Metered "Multi" Bank PDUs (7802)
.1.3.6.1.4.1.318.1.1.12.2.3.1.1.2.1 <- Multi-Bank Total Load (divide by 10)
.1.3.6.1.4.1.318.1.1.12.2.3.1.1.2.2 <- Multi-Bank B1 Load (divide by 10)
.1.3.6.1.4.1.318.1.1.12.2.3.1.1.2.3 <- Multi-Bank B2 Load (divide by 10)
.1.3.6.1.4.1.318.1.1.12.2.4.1.1.2.1 <- Multi-Bank B1 Low Load Warning Threshold
.1.3.6.1.4.1.318.1.1.12.2.4.1.1.2.2 <- Multi-Bank B2 Low Load Warning Threshold
.1.3.6.1.4.1.318.1.1.12.2.4.1.1.2.3 <- Multi-Bank Total Low Load Warning Threshold
.1.3.6.1.4.1.318.1.1.12.2.4.1.1.3.1 <- Multi-Bank B1 Near Overload Warning Threshold
.1.3.6.1.4.1.318.1.1.12.2.4.1.1.3.2 <- Multi-Bank B2 Near Overload Warning Threshold
.1.3.6.1.4.1.318.1.1.12.2.4.1.1.3.3 <- Multi-Bank Total Near Overload Warning Threshold
.1.3.6.1.4.1.318.1.1.12.2.4.1.1.4.1 <- Multi-Bank B1 Overload Alarm Threshold
.1.3.6.1.4.1.318.1.1.12.2.4.1.1.4.2 <- Multi-Bank B2 Overload Alarm Threshold
.1.3.6.1.4.1.318.1.1.12.2.4.1.1.4.3 <- Multi-Bank Total Overload Alarm Threshold
Metered "Single" Bank PDUs (7831)
.1.3.6.1.4.1.318.1.1.12.2.3.1.1.2.1 <- Single-Bank Total Load (divide by 10)
.1.3.6.1.4.1.318.1.1.12.2.2.1.1.2.1 <- Single-Bank Low Load Warning Threshold
.1.3.6.1.4.1.318.1.1.12.2.2.1.1.3.1 <- Single-Bank Near Overload Warning Threshold
.1.3.6.1.4.1.318.1.1.12.2.2.1.1.4.1 <- Single-Bank Overload Alarm Threshold
P.S. -- These were all queried using SNMP v1.
