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If your grandmother isn't tech savvy; just express mail a money order to her.
You can also do an online deposit to her banking account if she has one.

 

Big inverters are wired directly to your batteries. You've got the function correct, and that's all they really do. You need an APU or else idle the truck while using the inverter to keep it from draining the battery.

Also, I use two debit cards. I have one, and my mother has the other. My mother is VERY good with money, though, and never takes as much as she could.

 

My understanding is that most apus are reefer diesels without the cooling apparatus. They do rely on the truck battery, but they also charge it while they run. You can use multiple small inverters plugged into 12v sockets, but you need to be wary of runnering the battery down with any inverter.

 

An inverter is a converter of electrical power. It converts 12 volts DC power into approximately 120 volts of AC power. The power that the inverter converts from 12v DC to 120V AC comes from either the truck batteries or a truck's auxiliary power unit (APU). The inverter has some limit on what it can provide expressed in watts. An AC device like a microwave or coffeemaker pulls something near 1000 watts of AC power. Typically trucks with microwaves, etc. have inverters with 1500 - 2000 watts of capacity.

 

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Yes, you can only run some of your devices at once. My guess is your microwave or possibly a homestyle coffeemaker will demand the most power. Try not to use them at the same time. Things like household phone chargers draw very little current or watts. Everything has a little label or engraving on it somewhere to tell you how much power is draws. That power demand will be expressed in Amps or Watts. A Watt is Amps X Voltage. A Watt divided by Voltage equals Amps. Look where the power cord connects to the body of the device. You should see a label that says what voltage and amps, or watts it needs.