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  1. Petrol Head

    Connection/Protection ?

    Advice please, I'm confused about what I need to connect up the system & what protection I need, hopefully connect & protect via a single unit, fused busbar ? Hopefully all the info needed is in the diagram, sorry if this has been asked before but I can't find anything. Edit : 12 volt.
  2. Petrol Head

    Backup system planning

    LiFePo4 bank seems ideal for me, I'm going to set up a decent system & use it.
  3. Petrol Head

    Backup system planning

  4. Petrol Head

    Backup system planning

    Not MPPT function ... my fault for not checking. Thanks for the links, will look into.
  5. Petrol Head

    Backup system planning

    The label has been bleached by the sun but you can just make out the figures, the other image is the same as I bought, not that exact item, it was a couple of years ago. No worries if not suitable, I can get another.
  6. Petrol Head

    Backup system planning

    The max pv voltage is 50v for the 100a 'MPPT' if using that would it dictate a parallel string is the only option ? Battery - I've just calculated the cost of a DIY Lifepo4 12.8v 310ah (4x 3.2v 310ah cells) & blue tooth BMS for under £600 ($825), that has got my interest, 310ah Lifepo4 should...
  7. Petrol Head

    Backup system planning

    Thanks, I'll look into that setup, I do also have 2 generators tucked away.
  8. Petrol Head

    Backup system planning

    'interesting project' absolutely, especially making something that works, is safe, beneficial & at very little cost. All my USB is solar & a few gadgets too, it's not the saving in energy usage, which would be negligible, it's the satisfaction of doing it.
  9. Petrol Head

    Backup system planning

    Thank you Hegdes, a lot of good info to digest there. I have a couple of cheap MPPT controllers, a 100a, 1300w @12v, 2600w @24v also a 40a. I'm still undecided as to which route I take from here, purchase new quality components at much more expense or carry on & try to put a system...
  10. Petrol Head

    Backup system planning

    Thanks chrisski. The meter still has a high of 1205 & also an overall reading of 1.5kw usage in 43 hours, @ 837 per day, a little higher than my 685 per day from the manufacturers guidelines, probably the summer performance as you mentioned. I'll keep the meter going. I don't think I'll add...
  11. Petrol Head

    Backup system planning

    Freezer = 250kwh per year (from manufacturers data sheet) = 0.685kwh per day = 685 watt hours per day. Chosen back up because I'm in cloudy UK 3 days. 685 x 3 = 2055 wh. 2055 / 12v = 171.25 amp hours. 50% discharge = 325.5 ah 25% discharge = 685 ah. Am I right with the maths in thinking I need...
  12. Petrol Head

    Backup system planning

    Hi all, how do I go about planning a solar system to use as a back up for the freezer in the UK ? I have 880w in solar panel potential, 3x 260w & 1x 100w, hopefully 2 more 260w on the way giving 1.4kw. I also have an inverter 2000w PSW. I will buy the battery bank needed, that's the bit I'm...
  13. Petrol Head

    Hi from the UK

    Hi, looking to set up a home system as a back up.
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