Hi,
I'm planning a set up for charging a Victron Smart Lithium 12v 200ah battery from the alternator of my van (a 2012 Mercedes Sprinter 313cdi).
I will have Dometic Freshwell 3000 air conditioning unit in the back of the van which I would like to be able to use while driving and on hookup. The plan is to run it through a Multiplus Compact 12 2000 as it requires 230v AC - 4.2amps to run.
4.2a @ 230v = ~1000W, the Multiplus will need maybe 1250W supply when considering losses?, more losses in getting the power to the multiplus, through the leisure battery, from the charger/alternator means maybe working on the basis that 1500W is required from the 12v alternator?
125amps required from the alternator - is that a fair estimate?
I need to check the alternator I have fitted but could look at upgrading if it is not 180a+
What is the best way to ensure that the supply of power from the alternator/starter battery to the leisure battery is enough to offset the demand of the multiplus/aircon and not result in flattening the battery(s) on long journeys?
Options that might work:
- Multiple Orions in parallel - seems over the top to have 4+ orions in parallel just to achieve 120amps
- 1x BMS CL 12/100 for 100amps, in parallel with 1x orion for 130amps total - benefit of BMS included and the voltage controlled charging from the orion to help top up the Lithium battery.
Any suggestions on how to make this work are much appreciated.
Cheers,
K
