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here we are on a boat cruiser 4:20 that  we just did an inverter install and I'm  here to talk about emphasizing the  importance of where to actually get  power or way to connect the cables to an  inverter charger on a battery bank in  the manual they're always going to show  you a diagram and they're going to show  that the cable is directly connected to  a battery a lot of people think that and  they take that as an abstraction as a  general recommendation and they might  start getting creative because the  inverter might be far away or closer to  the battery switches or even closer to  the DC distribution and in this specific  instance an unknown or to an installer  that didn't really understand the  implications of what was required might  be tempted to actually have the inverter  directly connected to the DC  distribution thinking oh well it's right  there it's convenient shorter cable run  why wouldn't I do that and what they  might be doing is they might be  installing it on the switch side so the  house goes to a fuse the fuse goes to  switch the switch goes to the DC  distribution and then from there they  would install their inverter connected  to a switch DC distribution the problem  with that is that inverters now are not  for a lot of them are actually not just  inverters they're actually inverter  chargers and so this specific advice is  specific to inverter charger  installations with any charging circuit  it's absolutely essential that the  charging circuit is connected directly  at the battery so that would be battery  chargers solar that could be alternators  ideally wind generators methanol fuel  cell whatever  charging circuit you have should always  never be unswept and the reason is if  you ever switch off a battery and  disconnect it from a charging circuit  and potential loads are connected at  that same point so a battery charger and  the load are connected at the same point  and are suddenly disconnected from a  battery what's going to happen is the  battery chargers might act as what's  called a power supply and a power supply  and a battery charger are essentially  very different  a power supply is actually going to be  able to hold steady a voltage at let's  say thirteen point three volts on a  twelve volt system and hold it steady  regardless as loads are added or removed  what's interesting is a battery charger  has a longer react time it actually  needs to be connected to the battery so  those are connected to the battery and  the charger is connected to the battery  and as the loads are added or removed  the battery acts as a spring it's able  to take shock loads right and suddenly a  large load is removed well then if the  charger was directly connected to the  load as you would remove a large load  suddenly the voltage would spike and  that's the problem with using a battery  charger as a power supply some are built  that way but you need to make sure  especially with an inverter charger  their battery chargers are not power  supply so you always have to make sure  that the battery charger is directly  connected to the battery and that's why  your inverter charger the charger  function needs to be connected directly  at the battery and so don't be tempted  in installing that the inverter charger  at a switch DC distribution but install  it directly at the battery via what we  talked about a DC master disconnect  switch an inverter fuse proper sized  cable back to the inverter charger  you