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Daveh

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Everything posted by Daveh

  1. So you will have three 48 volt packs each with a separate charging source?
  2. Yes, I was going to comment on this also Glenn. Did I understand right you have three packs? If you have three separate packs then you need to monitor each pack. I think you could do a shunt on negative each pack and then a shunt on the main negative for a total reading. This is where it could make a huge difference what brand monitor you go with as some can communicate with each other and some not.
  3. I have a down converter from Victron that I am yet to install. I have the same concern. Not specifically on the breaker but that the terminals are not really large enough to accept my calculated needed wire gauge. I am going to run larger gauge and then just make adjustment to smaller size right at the terminal.
  4. https://www.bluesea.com/support/articles/Circuit_Protection/1437/Part_1%3A_Choosing_the_Correct_Wire_Size_for_a_DC_Circuit
  5. I cannot comment on the Balmar except that I have heard about it but not read any reviews. I did want to mention though that when looking at these items also look at their secondary functions. Some come with the ability to monitor the voltage on a second pack, they have the ability to set alarms and the ability to control the shutdown of the system under preset conditions. As Jack said the Victron has the bluetooth function so you can program and monitor from a chair rather than fussing with dials. I have been VERY satisfied with the accuracy of the Bogart Trimetric. I do think a learning technology is the next logical step for these monitors. I just don't know whether Balmar has achieved that without hearing more first hand information. I think with the names that have been put forward it is hard to go wrong.
  6. Glenn, the ME-ARTR won't do it alone. You also need the BMK to be able to read amps in--amps out on your Magnum monitor. Other well known brands are the Victron 700 series and the Bogart Trimetric. The benefit of using the BMK with the Magnum monitor is that then you don't need a separate indoor monitor. I went with the Bogart as that is what jack mayers was recommending at the time I put my system together but I now see the advantage of just staying in the Magnum family. The Victron 712 is the latest and greatest in those types of amp measuring monitors. As you probably know with lithium you are really much better off relying on amps used rather than voltage as voltage is not a reliable indicator with lithium due to the flatness of their discharge curve.
  7. Unless they have changed their manual--one fuse
  8. Yes, I think everyone understood John. The question is whether he wants to go from his 48 V to converters To his load OR go from 48 V pack to small 12 volt pack to load. The idea being that the 12 volt pack could better handle any draw surge(I am thinking small lithium pack) and be less at the mercy of any malfunction in the 8 to 12 converters. There is no magic either way. Just a design question.
  9. I was referring to Victron line of 24 to 12 volt dc to dc converters. Forgot you were using 48. They are not chargers but can be used as a charger to charge a 12 volt pack from a 24. This is a 48 https://www.invertersupply.com/index.php?main_page=product_info&products_id=185548&gclid=Cj0KCQiAq97uBRCwARIsADTziyZiZIbbIKXI7gTH0gv4aZ6xiMWXEqvejggGhEbwkTrCujdYfQkdrnQaAtekEALw_wcB
  10. I also think you are making a mistake here Glenn. Don't put unknown components in the middle of a very nice system. \
  11. Glenn look at the Orion ones by Victron. More expensive but not horrible.
  12. Yeah. They are pretty and convenient but are they THAT pretty and convenient.
  13. Aluminum has very good conductivity but less conductivity. You will find voltage loss charts for both copper and aluminum. Copper loses less voltage. It may not matter for you, but just look at the numbers and be aware. Also when you join aluminum and copper wires together it causes a chemical reaction and deterioration over time so use ox guard or similar product on any union.
  14. Yes. I would check if you inverter/charger gives specification. My magnum called for 4/0.
  15. Go for it Glenn. This is for lifepo4 but read it through as it may give you some thoughts on design issues. https://marinehowto.com/lifepo4-batteries-on-boats/
  16. All of the fires get categorized as lithium caused which is the problem. It is not apples to apples. Clearly LiFePo4 is the safest but there are many RVers successfully using Volt, leaf and Tesla batteries. If you are DIY you do need to know your battery chemistry and charge parameters. As you say both of the above are probably charger caused problems. Do not slap a lead acid charger on and expect everything to be okay. It is best to oversize the pack and not push them all the way to the top when charging. Unlike lead acid they do not need to be topped off.
  17. You should watch the battery section on the you tube called "beginning this morning".He does a large Nissan leaf cell installation.
  18. How Many amp hours are you thinking of getting? / /
  19. Looks like lg makes the leaf battery also so they could be either.
  20. These are the specs I see on a volt cell. See how they match up. Cell type Laminate type Cathode material LiMn2O4 with LiNiO2 Anode material Graphite Rated capacity (0.3C) 17 Ah Average voltage 3.8 VDC Maximum Voltage 4.2VDC Minimum Voltage 3.0VDC
  21. If you are looking at the BMS make sure it can handle both the charge and discharge amperage you will be throwing at it. Sometimes they just give you the discharge amp.
  22. Looks like LG makes the volt battery and those look exactly like volt cells so I bet that is what you are dealing with. From what I have read the volt battery charging range does not match up well for a 12 volt pack but does for a 24 or 48 volt. c He does a Chevy Volt battery install. If jcussen has been dealing with him i definetly would be interested in learning more.
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