Electrical integration

Current path

At roughly 65 A, battery/BMS, source fuse, disconnect, busbar, wire, connectors and A/C terminals must allhandle continuous current and startup/transient behavior.

Voltage drop

Measure voltage at the battery/bus and at the A/C under full load. The difference is lost in cable/connectionsand becomes heat. Use full round-trip length and temperature/installation derating.

Protection

Fuse to protect the conductor while meeting the A/C maker's specified value and fault-interrupt requirements.Place protection at the source before the wire can short to vehicle metal.

Low voltage

Configure A/C cutoff and battery reserve so cooling does not repeatedly slam the BMS off. A BMS disconnect is not a normal thermostat or pet-safety control.

System rule

Do not judge a cooling upgrade at the vent. Judge it by the hottest occupied zone, humidity, energy usedand whether the system can recover that energy safely.

CHAPTER CHECK

• I can explain which heat path this step addresses.• I measured its effect at front, middle and rear - not only by touch.• I added its power, failure mode, maintenance and safety action to the system plan.