Saturday, Jan 08, 2022 at 08:53
Daniel
For a single 100ah battery a Redarc BCDC1225D would be sufficient, and can be fitted to solar panels that have more than sufficient output as the max OUTPUT is 25 amps.
This should be wired to starting battery via its own 6B&S twin cable so as to avoid voltage drop, and its current consumption at full load will be slightly over the 25A when input voltage is @ better than 12v and internal losses are taken into consideration.
Your fridge will thank you if you supply a good power supply, and the use of a switched 6B&S twin cable from the starting battery will give you that supply, when supplied with the full 12v your fridge give the best cooling available, and by switching the supply you are eliminating the possibility of flat starting battery.
My system was set up for when my wife was on
home oxygen 24/7 ( a 7 to 9 amp current draw to keep the machine operating), and includes a Redarc 1240D in the van charging 200ah of Lithium, a big 2 door 3 way fridge, a Redarc 1225 in the car charging 120ah Lithium running a 40 litre Engle as a freezer, the car and van batteries connected via their own Anderson plug (
Grey), the fridge wiring of 6B&S twin cable from starter battery via ignition triggered switch and red Anderson plugs, a 4 B&S twin cable from starting battery to the 1240 charger in the van via 150 amp rated Anderson plugs, near 600 watts of Solar panels on the roof of the van feeding into the Redarc 1240, and 200 watts of solar on the roof of the car feeding the Redarc 1225.
As far as the Alternator is concerned I refrain from using both the Redarc chargers at the same time. I can easily remove either charger from the starter battery supply. The full use of the system will result in a low alternator voltage for about the first hour of driving after using the batteries for a night, so yes you can draw more current (Amps) than the alternator can supply. If in doubt just fit a Voltmeter to the starting battery, and if the voltage comes up as normal (normal being without the van) within a couple of decimal points then it is all OK.
My vehicle is Isuzu Dmax 2017 fitted with the 'smart' alternator, which has NOT been disabled.
Regards
Athol
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