Jonny Retrofit Posted January 7 Posted January 7 The Electrocooler A/C compressor can use up to around 80A. The actual current draw depends on the ambient conditions, the cabin temperature and the battery voltage. The ECU monitors these parameters and adjusts the compressor speed so that the battery does not drain, so, if you run the standard 300 Tdi alternator, the ECU may well reduce A/C performance or prevent the compressor from running at all. During testing, we have upgraded our alternator to the 100A unit (as fitted to the Discovery). This has proven to be ample to run the car and the A/C but if you have more accessories you may need to explore fitting a higher output unit. Earth Straps It is strongly advised to inspect and/or replace battery and earth straps. The studs and landing surface of any earth points should be cleaned until shiny. It is important that any earth strap lug sits flat on the landing surface so that maximum contact area is achieved. The same is true for attaching the compressor earth to the chassis. Batteries The kit has been tested with standard batteries typically 75Ah. The battery must be in good order. The A/C will use some battery reserve at idle. If you have a lesser rated battery, you run the risk of depleting it sooner but this is negated by having a high output alternator. Settings can be changed within the A/C ECU to guard against this at the detriment to A/C performance at low engine RPM.
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