Search results

  1. R

    Weight

    Sure they do. In the NT speed limits are as high as 130km/h.
  2. R

    Weight

    The insurance thing is something that comes up quite often, however I have never seen any actually state they have first hand knowledge of insurance being denied for being over GVWR. To me the whole premise doesn't make sense - the primary reasons to carry insurance is to protect you from...
  3. R

    Charging - Auxiliary Alternator vs. DC-DC/B2B. Which is Better?

    In theory anyway an auxiliary alternator is a way better solution. A DC-DC charger is a kludge to adapt an unsuitable power source to power/charge a battery bank, they add inefficiency, complexity and cost to a system. An alternator with the correct controller to produce the charge profile...
  4. R

    DC/DC charger + Solar musings

    This isn't going to work, at least not in the way you are proposing. There are two types of solar controllers, MPPT and PWM. MPPT controllers typically need to see a few volts above the battery voltage on their input in order to start charging. For the most common (and recommended)...
  5. R

    Do solar panels produce their voltage even when the sun is low?

    This is one of the common misconceptions with solar panels - they are current sources, not voltage sources. The panels will produce very close to their rated voltage even at very low illumination, but the current will decrease dramatically (see the figure below). For your situation there will...
  6. R

    Arizona is on FIRE!

    Here are the annual precipitation trends for the past 30 years: Sure looks to me that the southwest is drying. Notice this is in inches per decade- so '2' means the precipitation has decreased by ~6" in the last 30 years. Given that much of the SW only gets 10 - 20" of precip a year, this...
  7. R

    WANTED Flatbed 4 wheel camper Fleet or Hawk with truck

    Unfortunately that one is not a flatbed camper - it is a slide in mounted to a flatbed, which doesn't have the advantages of the flatbed. It does seem to be at about the going rate for a flatbed package ($80 - $120K) but is priced pretty high for a slide in on an old truck. The other place...
  8. R

    Full-time living, hard-side vs pop-top question

    I have only had a pop-ups, so I can't compare, but unless you plan on chasing warmer weather I am not sure a pop up is a great tool for the job. In the winter it takes a lot of propane to keep them warm, and in the damper parts of the country condensation on the lightly insulated soft walls...
  9. R

    Yeti Brand Storage Anything. Poor Quality Outrageously Priced

    Yeti's main business is branding. It always has been and always will be. It is about the sticker on your bumper bar more than anything special about the stuff they (don't even) make.
  10. R

    DIY Lithium pack, 26650 cells. Questions

    If you can install the LiFePO4's inside the living quarters of the camper, then the temperature thing is not a big deal. The battery will work fine at any temperature, you just shouldn't charge it very hard much below -5C or so, and the BMS will prevent this from happening. To start with, a...
  11. R

    Fully optioned 2006 U500 for sale

    Any idea what a comfortable road speed for this would be?
  12. R

    Understanding amp hours and lithium batteries

    I am well aware that I am not going to change anyones practices here. I was pointing out that the prevalence of Ah for batteries is not some superior system, but is an anachronism. With the increasing use of battery storage for serious applications (EVs, home power etc) and different...
  13. R

    Understanding amp hours and lithium batteries

    I am not sure how any of these are arguments in favor of Ah over Wh. I, and most power system designers, actually want to know what the energy efficiency of a storage system is, not what the 'current efficiency' is. For that you need to know how much energy (Wh) you put into the battery...
  14. R

    Understanding amp hours and lithium batteries

    Apologies, certainly didn't mean to suggest you were.
  15. R

    Understanding amp hours and lithium batteries

    No it is not. Watt hours is the actual measurements of stored energy. Amp hour is not a measurement of energy at all, you can assume some fixed voltage to estimate energy, but we all know a battery voltage is not fixed. Even worse, Ah is used to compare different chemistries. A 100Ah...
  16. R

    Understanding amp hours and lithium batteries

    Coulomb counting can just as easily produce Wh by multiplying by the voltage at each sample. Most Coulomb counters will also display in Wh. Maybe back in the day when everything was lead acid batteries, and everything ran of linear regulators which 'conserve' current, then Ah was at least...
  17. R

    Understanding amp hours and lithium batteries

    This whole Amp hour thing is a weird quirk of the battery industry and makes very little sense. It is crazy that you would try to represent energy storage (which is what we are after) with a Amp hours. Really it should be in Joules, but Watt hours at least makes physical sense. Seeing this...
  18. R

    Inverter, generator or both... or niether?

    Ask the manufacturer (Hallmark, Phoenix?) if they will just do the solar pre wire, but not install anything. The only thing you need them to do is to run 2 wires to the roof, everything else is easy to do after the fact. For a lot of manufacturers (eg Four Wheel Campers) the solar wiring is...
  19. R

    LiFeP04 charge controller recommendations

    The Redarc is fine, but a little bit limited in terms of solar input and configuration. For about the same money you can get the Victron 30A DC-DC charger: https://shop.pkys.com/orion-tr-smart-non-isolated-12-12-30 And the Victron MPPT Solar charger...
  20. R

    Mobius battery based power pack

    Does the extra capacity matter if you don't need it? Laptop batteries are typically ~50 - 80 Wh, and a hot spot and cell phones are about ~10Wh. Recharging all your devices all the way should be somewhere around 80 - 120Wh (assuming you do no charging in the car). A Westinghouse 200Wh...
Top