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  1. J

    REC BMS Connector

    2A should be ok as well. The relay inside the BMS is rated at 2A and it has a 2A internal micro fuse. So in theory you need nothing external, but as it is not an easy to find fuse and not so easy to replace, I prefer an external fuse slightly smaller so, in theory, it will blow first. As my...
  2. J

    REC BMS Connector

    You need to power the input to the relay inside the REC. This should be fused. The wiring harness will be labelled RELAY DCH F. I run this to a 1A fuse that is powered from the battery side of the main contactor. If on the controlled side when contactor is off REC can not control the...
  3. J

    UniStrut panel clamps?

    Just checked and they seem to have many options out of stock, and what is available is inflated pricing. But check here: https://www.zoro.com/search?fqv%3Avariants.variant.attributes.Material=Aluminum&fqv%3Avariants.variant.attributes.Overall_Length=10%20ft&q=strut%20channel I got the 10 foot...
  4. J

    UniStrut panel clamps?

    Aluminum unistrut is $25 for 10 feet sections at Zoro and the perfect solution. 80/20 is nice stuff to work with but mixing with unistrut doesn't make sense and using only 80/20 is way overkill for a large install.
  5. J

    Airstreamer looking for some advice on mounting to a curved roof

    Either install panels properly; with the correct mechanical fasteners; or stick to portable ground panels. Running panels installed with just tape can kill someone.
  6. J

    Help Understanding Roof Types for Mounting

    Check our Zorro online for strut channel - they have really good pricing and delivery is not so bad if you need several lengths at once.
  7. J

    Does this seem like low production for panels on my 5th wheel?

    Today is really overcast but still pretty bright out. I did the voltage measurements again 105.1V and 105.7V for Voc with open load. So still pretty close to theoretical even in "poor" sun. Temp is 22C which is below my test yesterday, which was around 27C. Solar production is at 331W on one...
  8. J

    Does this seem like low production for panels on my 5th wheel?

    They are mounted straight up with a 2.5 inch gap between panels and roof.
  9. J

    Does this seem like low production for panels on my 5th wheel?

    I'm in Annapolis and just did a test. I have 1800W of solar panels (4 of the 450W Rec Alpha 72 panels). They are setup with 2 strings of 2 in series each off a MPTT - so 900W per MPTT. Each MPTT is a Victron 150/100v2 on latest firmware. Voc is 53.1V per panel from the specs (106.2V for 2s)...
  10. J

    Does this seem like low production for panels on my 5th wheel?

    Yes most likely. The other quick test is a blanket or towel and put it over one panel at a time during your solar hours and see if each time the output goes down by about 1/3rd of the string total without any covering. You are looking for any single panel that contributes more or less then the...
  11. J

    Does this seem like low production for panels on my 5th wheel?

    My experience is for panels in any sort of decent sun you should be close to the open circuit voltage if nothing connected. It is when loaded that the voltage will fall based on solar conditions. If you are not getting close to Voc with no load you might have a wiring or panel issue.
  12. J

    Does this seem like low production for panels on my 5th wheel?

    What is open circuit voltage on both strings? Should be 121V in reasonable sun.
  13. J

    Battery Behind Seats in Tacoma. Is this a bad idea?

    Just make sure it's not going to come loose in an accident or roll over and you are fine. Also make sure nothing can short, etc.
  14. J

    Joe Biden owns a share of a LiFePO4 battery manufacturer?

    It was in the conservative news in last few days - it's owned by Hunters holding company. It is poised to do very well with the lithium secured from Taliban in Afghanistan, as will all the LFP manufactures.
  15. J

    12/3000 multiplus II and 8 x 280EVE. What BMS?

    I understand the desire to keep it 12V as it's simple - all one voltage to deal with. But you are also talking about a big enough battery pack that it warrants considering 24V. What are you AC loads you intend to run as the inverter is usually one of the bigger loads to consider? What size of...
  16. J

    For the best connection I solder, do you? Why not?

    I solder any small signal level type crimps - for example BMS voltage sense wires. Unless using a connector like a Deutsch that uses barrel crimp style connections. I crimp any large high current connections. This is because with high current comes temperature rise and expansion/contraction...
  17. J

    12/3000 multiplus II and 8 x 280EVE. What BMS?

    Are you already fixed on 12V or is 24V or 48V an option?
  18. J

    12/3000 multiplus II and 8 x 280EVE. What BMS?

    Don't get me wrong - the SBMS0 by Dacus is a really nice unit, as you certainly have a very knowledgable guy behind it. What it doesn't do is all the canbus integration with the Victron equipment that allows you to use DVCC on the Victron. What does DVCC allow? - Shares BMS shunt information...
  19. J

    Compression, Balancing, Reconfigure the pack

    What voltage and charge rate?
  20. J

    Looking for constructive input - Upgrading system in my Class A

    CCGX is end of life. Go Cerebo and the new Touch 70 7 inch screen, opposed to the Touch 50 5 inch. Or if you are into linux and such you can roll your own using the Venus OS and a rPI.
  21. J

    12/3000 multiplus II and 8 x 280EVE. What BMS?

    REC BMS or you are wasting much of the feature set of the multi-plus.
  22. J

    Looking for constructive input - Upgrading system in my Class A

    I like to put the EMS after the ATS so that it also warns/protects from any generator issues; which can and do happen.
  23. J

    State park. No generators.

    This is becoming the norm all over; but they will also nail you for idling,
  24. J

    Cell Terminal Strain Relief, bus bars, and compression

    Like the BlueSea contactor - using a 7713 myself. How/where did you get those bus bars from the contactor to the class-t?
  25. J

    At this point... if you are buying From Alibaba/Aliexpress you deserve what you get.

    One challenge is the Chinese have ramped way up on their electric submarine production with something like 60 subs under construction. These are all electric powered using large lithium battery banks with sterling engine powered generators that somehow do not need air/oxygen to run to recharge...
  26. J

    Cell Terminal Strain Relief, bus bars, and compression

    They are a bunch of 0.1mm thick thin sheets stacked and somehow fused at the bolt ends. 30 layers to get 3mm. I have tried these and they work but my fear would be corrosion between the 28 layers of raw copper as only the top and bottom are tin plated. They do flex a bit -- more that enough...
  27. J

    Accessing Victron Multiplus Settings?

    Yes, I guess the only possibility is if you are running a rPI off an AC brick that is being supplied by the Multiplus. But in all the installs I've done if they have a rPI we use a little 5V buck convertor to power it right from whatever the DC side is.
  28. J

    Accessing Victron Multiplus Settings?

    Works great, and makes working on a remote install a lot easier. Just *make sure* that whatever is running Venus OS is not powered by the Multiplus.... It will ask you many times to confirm during a firmware load as it is a sure fire way to brick the device if so.
  29. J

    Accessing Victron Multiplus Settings?

    Not really correct. You can do all this remotely now with a Cerbo GX. You need to get VRM going and then can download the Multiplus settings via VRM, take into VEConfigure3, change settings, write out updated file, and use VRM to load it back. You can also upload firmware this way - via VRM...
  30. J

    Calculate amps through each bus bar?

    Mine were much smaller, and the material was some sort of tin and not copper. 13mm by 1.2mm.
  31. J

    Compression, Balancing, Reconfigure the pack

    I like to: Parallel balance (won't get into the topic of how as many opinions/threads on that) Discharge pack to about 80% of capacity Parallel balance again to ensure cells really are balanced/stable Discharge pack about 50% of capacity Disassemble and assemble into the final topology I do...
  32. J

    Cell Terminal Strain Relief, bus bars, and compression

    The issue is never the correctly done crimp! The issue is the cable jacket! The jacket is sealed to the lug - heatshrink tube with self melting glue inside is typical - will always fail. In your picture where the cable is subject to a tight bend radius they will fail faster. If you go with...
  33. J

    Calculate amps through each bus bar?

    This looks reasonable but before you commit to it what material are you using for the bus bars? If it's the crappy bus bars that come from China then it is worth thinking about. But if you are making your own out of something like 3/4 wide by 1/8 thick copper you will easily have 100A current...
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