My Moto Hobo life

I think a deep cycle battery like that used in flooring equipment may suit better. 12 24 48 volts in parallel not sure how that would work with a solar charger but just throwing that out there as you look at that issue Jim.
 
If you are ever eastern washington - Burbank WA. I got a place for you to stay a night. travel safe.
 
The biggest problem with lithium batteries is that they need a specific charging profile. You can’t just slap one in as a replacement for a lead acid. As a second battery connected to a lithium charger, they work well and can be drained down a lot further than a lead acid battery.
 
tribal said:
Rt12 to Escalante Utah.
World class riding.
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What capacity is your battery?
What capacity is your battery?
a 1000w inverter will draw around 100 amps at full load.
Not knowing what the wattage of your coffee maker is, but lets assume 500 watt, then you'll be drawing 50 amps on the DC side. That's not taking into account the efficiency of the inverter, for a good one it's typically 85%.
So, if you have a 100 A/H battery, you should be able to run your coffee maker on a fully charged battery for 2 hours, but in the real world, you will be lucky to get an hour, due to inefficiencies in the battery as well as the inverter.

Often the DC load is greatly underestimated when it comes to installing inverters.
 
Also most modern inverters have what they call a battery save feature and will not allow you to draw the battery too low, this also maybe why you are cutting off at 11.7 volts, see if you can set that threshold to a different number.
 
Ralsmith said:
Also most modern inverters have what they call a battery save feature and will not allow you to draw the battery too low, this also maybe why you are cutting off at 11.7 volts, see if you can set that threshold to a different number.
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Yes, that seems to be what’s happening as the Inverter starts beeping at that point.
If I catch it quick it won’t shut off and the battery will not go into shelf mode.

I don’t see any settings on the Inverter but I lowered the discharge setting on the controller to 9V and will retest.
 
What is the wattage of the coffee pot, the maximum discharge rate of the battery you are using is 100A. This means that the largest load you could theoretically place on the battery would be 1200W before the battery shuts itself off from overload conditions. In practice, with inefficiencies in your inverter and the load the inverter adds itself you are probably limited to 85% or 1000W maximum load. Only way to increase load capacity would be to have another battery in parallel with this one to share the load.
 
Under a heavy load voltage drop can be an issue, how long are the cables from the battery to the inverter and what gauge wire. You need to keep those short as possible and as large as possible to reduce voltage drop between battery and inverter input.
 
IDK, just seat of the pants, 800 watts seems like it would be a big load for a 12v car type battery. I'm thinking your over your limit.
 
Your solar panel at 60 watts will deliver around 4.25 amps of charging power. If your battery is at 50%, it will take over 11 hours of good sunlight to return the battery to 100%.
My gut feel is that your battery is just not fully charged, hence the voltage drop when you use the coffee maker which will draw around 80 amps on the DC side of the inverter, pulling the battery voltage down.

In battery systems with solar charging the best calculation is as follows:

Work out what your total load is, lets assume 80 amps for 30 minutes (40 amps used)
Work out how many daylight hours you'll have for charging - lets assume 5
So, you'll need a solar panel that can deliver 40 amps in 5 hours - Charging rate = 8 amps so the absolute minimum will be 100W
This does not take any consideration for losses and inefficiencies.
 
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