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hi youtubers  jeff cote here with pacific yacht  systems doing another installment of ask  pys  all right we've got a fellow voter here  asking about  this concept that i bring up all the  time between unswitch and switch  distribution  and you can ignore that at your apparel  remember i've got lots of presentations  on that and the concept of unswitch and  switch distribution  is um if you don't care about that  you're going to be in a world of hurt  a world or hurt your boat's going to be  magical so one of the questions here is  from the boater is jeff i've got a solar  panel and you're saying in your videos  about connecting the solar controller  effectively from the solar panel  to the controller and we've got a little  controller right here  so this little controller from victron  this 7515  is a controller that we use all the time  that controller should be  always connected to the unswitched  distribution and the boater here is  asking why  it's important to remember that all  charging circuits being an alternator  solar controller wind turbine battery  combiners battery isolators  all devices that are used for charging  should always be connected to the  unswitched distribution  if you don't do that this is where  magic happens so for example if this  solar controller is connected to the  switch side of the distribution  and i see this all the time boaters are  trying to save cost  save time right and you connect that  directly to your panel and so basically  if you connected your panel your panel  is switched  so you've got a solar controller  directly connected to your basically dc  panel  the moment you actually take on and  here's a battery switch  i got props this week right um  so you've got a battery switch and the  moment you disconnect your panel  what's going to happen is this solar  controller here is actually effectively  powering your dc  panel right but not connected to the  battery so the moment a load is removed  basically what's going to happen is the  voltage is going to jump up or the  moment a load is added  this won't respond as quickly you need a  sort of a  a damping device and a battery allows  you to take  loads being removed and added quickly  without having the voltage spiking or  dropping  so that's why it's so important to have  all  charging sources be connected to the  unswitched side  which is effectively means the battery  but we can't bring everything to a  battery because  the battery post is not a distribution  system right it's just a battery  so that's why we put in bus bars that  allow us to have  unswitched distribution so that was a  really good question  and the concept is very important and do  not ignore it un-switch  versus switch distribution  thank you for watching this video if  you've got further questions  and you're wondering about your own boat  please ask questions below or send us an  email with your questions and we'll get  to them  hopefully as soon as possible if you haven't done so please subscribe  to our youtube and get our weekly  updates we're posting about four videos  a week right now  and also thanks for watching