Inverter questions

4/0 wire at 6 ft is crazy IMO. I saw that table from Xantrex. They appear to want too small a voltage drop.

I have a 2000w PSW inverter that runs the microwave pulling about 125 amps DC. Have seen 150 amps with the previous bigger MW. My usual set-up is about 5 ft of #1AWG cu each for pos and neg to about 400AH of battery. I see about a 0.8v drop with those amps.

That means I can run the MW when batts are 12.1v (50% SOC) and voltage at the inverter is 11.3v, above the 11.0v alarm. It will stay above 11.0 for a short MW run. More importantly, it stays well above for running the toaster in the morning which pulls fewer amps.

If you only have two batteries instead of four, IMO fatter wire won't help much to stay above 11.0v. That would be like me at 50% SOC already with your batteries full.

It may depend on how many cups of coffee, of course. The thing about having just 2 (or even 1) battery is that if they aren't fully charged, things can get iffy. Having 4 in the same condition has a better chance of working.

If you have coffee in the morning and an adequate solar system, you should be recharged quickly on most days.

Most likely will work fine. That's a resistive (heater for example) load, rather than inductive (motor for example). Inductive loads are more difficult on an inverter, and often have a high current spike during startup.

Here's the testing I've done on several coffee makers.

http://www.2manytoyz.com/coffee.html

This is so I know what I can run when the power goes off at home. I have solar panels, batteries, an inverter, and a couple of generators. My Keurig mini peaks at 661W, and takes 1.5 minutes to brew.

Make sure you use heavy gauge wire between the inverter and batteries. Xantrex requires a 4/0 cable for their 1800W inverter.

The actual run time is very short when brewing coffee. Two batteries should be fine. I have a friend who's got a single battery and 1500W inverter in the covered bed of his truck. They often make their own coffee at rest stops. He's using a Keurig mini and a 1500W inverter.

2 batteries will be marginal. 4 is better.