diy solar

diy solar

Recent content by jimcalf

  1. J

    Wiring Question. Are there any resources that make precrimped 4 gauge and 6 gauge wires for 400 watt van system?

    https://www.batterycablesusa.com/ I crimped my own with a Temco hammer crimper ($23 at amazon) but I did buy the cable from battery cable USA. They will terminate for you at a reasonable price. I just wanted a perfect fit, which I thought would be too hard to pre-measure. Easier to lay the...
  2. J

    Charging off generator in RV

    Not sure what you mean by the "Multiplus Gen Input" on a 12/3000/120 Multiplus. Mine has "AC-In" and that's it. If I want to hardwire a generator, I need an ATS between the genny/shore and the AC-In to detect and route the AC source to the Multiplus.
  3. J

    Charging off generator in RV

    I'm assuming that your generator is fixed and hardwired into the ATS, as is your shore power? Then the ATS detects which is providing 120V and passes that source to the Multiplus inverter charger. Seems to me that you're bypassing the Multiplus when running the generator. The Multiplus is...
  4. J

    Lost on Battery/BMS wiring & config

    I did. I've used it to build my battery bank and it's worked really well. I've no idea how accurate it is, but I set it to 7Nm of torque for the battery terminals, as recommended by Docan Power for my EVE cells with laser welded studs, and the nuts are tight and no damaged studs. I guess...
  5. J

    Looking for insight on RV 13.5kbtu AC

    If I find that this summer we boondock enough to justify swapping out the rooftop A/C for a mini-split, then I'll consider revamping my solar array. Removing the A/C unit from the roof would be a game changer for what I could fit. Still not convinced that I'll need it unless I can work out a...
  6. J

    Looking for insight on RV 13.5kbtu AC

    I only have 860W because that is all that will fit. I still have room to move around the roof for maintenance, but not much. Lots of obstructions when the roof is only 18' long x 7' wide, but you have a shower skylight, two vents, A/C, TV and radio antennas and vent stacks. Fitting panels is...
  7. J

    Looking for insight on RV 13.5kbtu AC

    Running off batteries, through my inverter (Victron Multiplus 24/3000) my 13.5kbtu Dometic Brisk II draws 12.5A when the compressor is running. That is accounting for inverter loss. How much will be used in a day? Depends on all the usual factors (temp, humidity, thermostat setting, sun...
  8. J

    Voltage drop from solar panel Voc to MPPT under load

    I considered tilt mounts, but so much of my camping is east of the Mississippi and limited to pulling into a designated camp site. Even when dry camping I rarely get to choose the orientation of my trailer. When talking to others, they noted that initially they tried to always tilt, but found...
  9. J

    Voltage drop from solar panel Voc to MPPT under load

    Are your panels tilted towards the sun or lying flat? That's really good output. I saw as high as 685W on Feb 1st if I tilted the panels perfectly at the sun. Tilting definitely makes a huge difference. Especially in the winter.
  10. J

    Does it hurt a lithium ion battery to charge it with an alternator at less than 14 volts?

    I think I'd be way more worried about killing your alternator if the battery is really low. They can draw a huge amount of power when charging if not regulated.
  11. J

    Solving problems, optimizing solutions

    The noise was also a factor for me, since it sits right under me when I'm sleeping. I have a Victron Multiplus, and 99% of the time, I don't know its there. Yes the fan runs when the A/C is on, but no way I can hear the inverter over the AC noise. The fans dial down quick when the demand...
  12. J

    Voltage drop from solar panel Voc to MPPT under load

    I've seen as high at 2.4kWHs in the last weeks, so your predictions are pretty spot on. As I've used the system more and gone through the historical highs, I have seen over 600W of production from the panels on peak days. I thought that was pretty good for flat panels in NE Ohio in late April...
  13. J

    Solving problems, optimizing solutions

    I have the luxury of being retired, so if I were to full time, I'd follow 70 degrees. I hate living in NE Ohio in the winter, and I live in a very well insulated townhouse. I'm way too wimpy to live in subzero temperatures for very long in a trailer. If I did want to do some serious cold...
  14. J

    Solving problems, optimizing solutions

    How are you handling the condensation when it's cold and you're running the furnace a lot? I've found the 2108TB to be a bit lightweight when it comes to insulation. Walls are only about 1.25" thick, vs. the 2" thick walls of other rigs. And of course, single pane windows get tons of...
  15. J

    Voltage drop from solar panel Voc to MPPT under load

    I loaded GUI_mods onto my Cerbo GX. It allows you to choose to show many temp sensors. On that photo, I only had one wired up so far, which was the temp sensor that came with my Multiplus, but plugged into my Cerbo GX and ran under my trailer. I have it on a nylon post to it really just...
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