Jun-20-2022 05:34 PM
Jun-21-2022 04:02 PM
ScottG wrote:
Reflectix is for heat infiltration and isn't intended for cold. Details are on its packaging. So maybe find a better insulation material to put in its place and it could make a big difference!
Jun-21-2022 03:45 PM
maria_bettina wrote:stevenal wrote:
Once the fuse blowing issue is solved, I expect you'll be dealing with battery capacity. Heating appliances will draw your battery down very quickly.
Yes, I am bummed. I don't know how to heat ourselves at night. Below 40-degrees and it's downright uncomfortable. We have a Little Buddy heater, but not for sleeping. We have Reflectix around the vinyl (we have a pop-up TC), but that's not enough.
Back to the drawing board.
Jun-21-2022 11:46 AM
Jun-21-2022 11:01 AM
Jun-21-2022 10:31 AM
maria_bettina wrote:
I have an uber safety conscious son who won't run the Little Buddy at night. I guess it could be worse. I could have a son who juggles knives or something. 🙂
Yes, it's the breathing the frigid air that keeps me up.
Jun-21-2022 10:28 AM
maria_bettina wrote:120 to 12 is a factor of 10
I ended up calculating the DVD/TV draw, and it meshes with what I saw on the Renogy screen, ~3A. Which seems crazy high to me, but I gotta start thinking in 12 volts, which is clearly difficult for me to wrap my brain around.
Thanks for the link. I will check it out.
Jun-21-2022 10:24 AM
maria_bettina wrote:time2roll wrote:
Inverter should draw power direct from the battery using #8 wire minimum. 250w is close to 25 amps at 12 volts.
If I bought a new inverter and connected it to the battery directly, I am still looking at 25A. Which is crazy. We have a 200Ah battery, so 4 hours of continual use (before I reach 50% battery charge)? But if that same 250 Watt heater was DC, that's a whole different story. Electricity is like magic. Totally boggles my mind! Haha
Jun-21-2022 10:01 AM
Jun-20-2022 09:45 PM
maria_bettina wrote:time2roll wrote:
Amps x volts = watts. DC or AC works the same.
Always use 12 volts when calculating because that is where the power is coming from.
Otherwise need to plug into a 120v generator.
The 12 Volt Side of Life
This discussion has been eye-opening. !!!
I ended up calculating the DVD/TV draw, and it meshes with what I saw on the Renogy screen, ~3A. Which seems crazy high to me, but I gotta start thinking in 12 volts, which is clearly difficult for me to wrap my pea-brain around.
Thanks for the link. I will check it out.
Jun-20-2022 09:31 PM
time2roll wrote:
Amps x volts = watts. DC or AC works the same.
Always use 12 volts when calculating because that is where the power is coming from.
Otherwise need to plug into a 120v generator.
The 12 Volt Side of Life
Jun-20-2022 08:57 PM
Jun-20-2022 08:18 PM
CA Traveler wrote:maria_bettina wrote:Nope a 250W DC heater: 250W/12V = 20A+, ie It will draw 20A+ DC amps.
But if that same 250 Watt heater was DC, that's a whole different story. Electricity is like magic. Totally boggles my mind! Haha
Jun-20-2022 08:14 PM
jimh406 wrote:
You can use a Little Buddy or Buddy heater in an RV. To be extra safe, open a window. Most people just use heaver bed covers at night.
Jun-20-2022 08:11 PM
pianotuna wrote:maria_bettina wrote:
Yes, I am bummed.
How many amp hours is the battery bank?
The rule of thumb is multiply amps by 10 to get the draw at 12 volts. This is due to inverters being at best about 88% efficient.
If the voltage on the battery is low, the inverter may well draw even more amps, causing the fuse to die.
Generally the inverter may be sized to do 125% of the load. 250 x 1.25 = 312.5 watts (so the inverter is busting its heart out trying to run that heater).
There are a couple of solutions.
1. connect the inverter directly to the battery posts. That will eliminate the fuse and amperage issues.
2. Use a 50 heating pad instead. You could run two.
3. There are 12 volt heaters available.
In any event the batteries are not going love running the heater for long periods of time.
My first battery bank was 875 amp-hours. Heaters were not an issue.
Jun-20-2022 08:10 PM