There is a Victron 3kw inverter fitted which is connected using 70mm² cable to the domestic batteries. The boat is a 60ft canalboat, it now has 3 x 225Ah batteries on the domestic side, and 1 x 110Ah on the engine side.
Marine battery isolator switch wiring full#
Ok, as there is a mixed opinion already, let me give you the full rundown. There is a large fuse (I dont know the rating off the top of my head) connected about 1 inch from the +ve take off point on the domestic battery bank. The boat did pass its BSS examination last Sunday (however we put the 3 x 110Ah batteries back in, because the 225Ah do not fit in the battery tray properly). If an alternator was connected directly to the batteries, then for it to pass a Boat Safety Scheme examination it would be necessary to fit a suitable fuse in the circuit and also to provide written evidence from the manufacturer of the alternator supporting the decision to by pass the main Isolator. Richard you are very wrong and should not be giving advice like this until you better understand the requirements of wiring on boats which come under the requirements of the BSS. My question is simple, is this right? Or should the 2 pole isolator, actually be a 3 pole? However this means that when the switch is turned off, the alternator is still connected to the batteries, so if the engine runs, it is still charging, and if the engine is not running, there is still a 12v feed to the alternator. The alternator and battery both go to one pole, and the load goes to the other pole.
The engine has 2 alternators, one for the engine battery bank, and one for the domestic.Įach circuit (engine and domestic) has a battery isolator switch with 2 poles, so effectively te switch either makes, or breaks the circuit between the 2 poles. I have noticed however that the 2 battery isolator switches do not fully isolate the batteries. This has had the desired effect, and the electricity reliability, especially the 240vAC is significantly better. He has changed from 3 x 110Ah Batteries, to 3 x 225Ah batteries.
I have recently helped my dad replace his domestic battery bank.
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