ISTR CA Traveler already told you this ?, but here it is from his post anyway:
" And a caution for those with a Magnum and no battery monitor. When I found out my unit was only charging 80A maximum the display (no BMK) was showing 100A. How can this be? So I started preparing to take the unit to Magnum for repair. A phone call revealed that a 80A output at 117V AC input was by design. Furthermore the 100A DC output display when the output was 80A was also by design. You see they don't actually measure the DC amp output but rather calculate it based on the AC input - that is not a typo. The other limiting design is the lack of a remote voltage sense capability. So the charger/inverter has no knowledge of the actual battery voltage. While the 5 stage Magnum charging is excellent the unit does have "cost/design" compromises as confirmed in my phone call to them."
