Recent content by jwelter99

  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.
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