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  1. bruceb58

    LiFePO Batteries ???

    The reason you lose 30% with a PWM is because the max charge current you can get is the max current that the panel can put out. An MPPT can in theory get 100%. Let's say you have a 100W panel that has the specs 20Vmpp and 5Ampp. With the PWM, the most power will be 5A x charge voltage which...
  2. bruceb58

    LiFePO Batteries ???

    You may actually want to just put a cheap solar controller to keep the AGM batteries charged. Put a DC to DC converter between the AGM and the lithium but keep the turn on voltage high enough so that the DC to DC only comes on when the engine is running. Lithiums do not care how fully charged...
  3. bruceb58

    LiFePO Batteries ???

    That's better. However, I would skip both isolators. Just put an ACR between the two AGM batteries. Run the output of the DC to DC converter to just one of the batteries. Basically, once it gets fully charged enough that the voltage hits the ACR trigger voltage, then the two batteries will...
  4. bruceb58

    LiFePO Batteries ???

    You can't run two different solar controllers off one panel, especially MPPT controllers.
  5. bruceb58

    LiFePO Batteries ???

    Won't matter for the DC to DC converter to lithium...one bit. It's the whole reason you use a DC to DC converter. Personally, I would ditch the 2 alt/3 battery isolator and just have each engine charge it's own battery with a manual switch and/or and ACR to combine if needed. Never really...
  6. bruceb58

    LiFePO Batteries ???

    The AGM battery will be supplying voltage to the DC to DC converter until: 1) The DC to DC converter detects that the alternator isn't operating...voltage below setpoint. 2) The LiFePO4 battery gets fully charged which is around 14.2V to 14.4V 12.8V is not the LiFePO4 battery voltage. Lithium...
  7. bruceb58

    LiFePO Batteries ???

    The alternator output has very little ripple...50mV is typical. The DC to DC converter does not care about that. It also doesn't need a battery to dampen voltage. Many DC to DC converters are driven straight off alternators. However, it needs to be a smart alternator to be used without a...
  8. bruceb58

    LiFePO Batteries ???

    Since you are worried about the temps of the batteries, you should be equally worried about the temps of the equipment that is charging them and the inverter. All should be operating in an environment less than 140F. Also, the batteries should be as close to the inverter as possible so if you...
  9. bruceb58

    LiFePO Batteries ???

    LiFePO4 is a Lithium Ion battery. There are many subtypes of lithiun Ion batteries....one of which is LiFePO4. https://en.wikipedia.org/wiki/Lithium-ion_battery Go to the Battleborn battery site...one of the pioneers of drop in LiFePO4 batteries. The home page even calls them lithium Ion...
  10. bruceb58

    LiFePO Batteries ???

    EDIT: I forgot that the Renogy unit does have circuitry that detects when the alternator is charging. Was thinking of the stand alone Renogy DC to DC converters.
  11. bruceb58

    LiFePO Batteries ???

    Another BTW... ...When I am not using my trailer, I store them at around 60% state of charge. They self discharge very little and would self discharge even less if I disconnect the Victron MPPT which draws around 25mA. I bought the Victron IP43 50A charger which also supplies my trailer when I...
  12. bruceb58

    LiFePO Batteries ???

    The Epoch are better built than any of these other cheap batteries. There are some videos that show how they are built. They also have heaters if you chose to use them for cold weather charging. For example, until recently, LiTime didn't have cold weather protection in their BMS so you could...
  13. bruceb58

    LiFePO Batteries ???

    A lot safer than lead acid batteries under the bed.
  14. bruceb58

    Maybe my turn for new boat time

    Let me know...can print it in a rubbery type material too.
  15. bruceb58

    LiFePO Batteries ???

    Also...I highly suggest the 50A DC to DC that Victron just came out with. I just bought one for my trailer. I would NEVER EVER use Renogy equipment. I don't see it in your diagram you should add a battery monitor like a Victron Smart Shunt or BMV-712. The main reason you go with two separate...
  16. bruceb58

    LiFePO Batteries ???

    I love lithium batteries...have them in my travel trailer. In fact I made 2 280AH batteries myself for my trailer. Personally, if were to buy a couple batteries today, they would be the Epoch batteries....especially the 460AH ones. And for the naysayers, LiFePO4 are probably safer than lead...
  17. bruceb58

    Bunk Boards or Guide Poles?

    I used to have side bunks on my 24' Wellcraft. My newer 26'Cobalt doesn't have them and I don't miss them since I have almost no wind ever at my launch ramp and I only need to launch/retrieve once a season since my boat sits in the water all summer. If you aren't like me and have wind or...
  18. bruceb58

    Maybe my turn for new boat time

    3D printing to the rescue. I love my 3D printer. Give me dimensions and I will print a shim for you.
  19. bruceb58

    2024 NFL/CFB News and Nonsense

    Yes and Michigan may have to forfeit all their games.
  20. bruceb58

    2024 NFL/CFB News and Nonsense

    Chargers have Harbaugh!
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