Why not just plug the pod into the generator and let the onboard converter charge your battery(ies) a couple of hours a day?  Plus, you have 120v power for the duration. That, and a 100w Renogy solar suitcase should keep you going as long as you want with however many batteries you have.

The Goal Zero thing is basically just another battery with a buil-in inverter.  it will need charging on a regular basis, depending on how much you use it.  You're back to needing your generator or a solar panel.

TT

You need to stick with a 12V battery bank because your entire dc electrical systems is 12V. Its better to connect batteries is series than in parallel because they charge and discharge more evenly, so that leads you to a 2 series 6V system.  The GC2 case size is the largest that fits in the existing rack and 2 of those add about 130 lbs to your unloaded tongue weight, which is a lot.

My water pump uses 5 amps. But it is on so little that it is not a significant energy user.  Its simplest way to calculate energy use in a battery system is in amp hours. Here is my daily summertime battery use for example.  it's warm in NC in the summer so I'm running my bathroom fan a lot and I have a couple of portable 12V fans. if I wasn't running those the load would be much lower.  

So, I can go about 2 days between recharges on my 230 amphour battery pack (don't take lead acid batteries below about 50% state of charge on a regular basis unless you want to replace them frequently). If you need more capacity than the usable 100-110 amphours or so in dual GC2's then either go with lithium or provide a charging source. As you already have the Honda and it appears like you usually have hookups I suggest that you just use that and recharge with the on board charger that came with your rPod. 

If you are planning for longer boondocking adventures and you don't generally camp in deep forest then you can consider adding a 100-160 watt solar module plus charge controller. It does not need to come from any particular manufacturer. That will extend your boondocking dwell time and might eliminate generator use entirely if you're not running the cooling fans or furnace a lot.

If you're considering getting an inverter then think about what 120vac loads you want to be able to run. Forget running the a/c that way, it uses way too much energy. Its possible to run the microwave for very limited times from the battery via an inverter but you need a large inverter. The rest of the stuff that came with your trailer all runs on 12V except the TV, which you can inexpensively replace with a dual voltage one, That is more reliable and efficient than using an inverter. 

You are right that if you just take the batteries out and store them without maintaining charge you can run into trouble. Lead acid batteries self discharge and the warmer it is the faster the self discharge is. So folks that live in cold climates tend to have better results if they charge the batteries once and store them for the winter than folks who store them in a warmer climate do. But it doesn't hurt anything to leave them on a charger if you have access to power (grid or solar) and keep them full of distilled water. 

What Offgrid has done here is what I call a Power Audit. I advise anyone that wish to 'dry-camp' to do one. Such great info here at your finger tips! Great job Offgrid!

I go a bit differently and my usage is only 27ah max. Typical/average closer to 12/20ah. 

Everyone has there own way of camping and what they require to run. I suggest you run one of these as well.

I also have dual 6v's at 210ah deliverable, yet safety/conservatively only 105ah to be used. I will add that AGM's/Gel's can go as deep as 70% without causing any issues, yet 6v's are your best bet if you require going deeper. I've yet to go below 75% SOC with with my panels and re-charge from my TV. 

We travel months at a time, not just a weekend..

I do have a portable lithium battery that states 100ah (wish it really was) and rates out only at 35ah. Still a very nice secondary source of power not using the house batteries. 

'My' only item of issue to re-charge is my laptop. That is 'our' entertainment system (as well as all else a laptop does). It requires 19v to charge. My intention is to buy one of these, not necessarily this one, yet something like. I'm attempting to ensure it sine wave.. 

http://www.amazon.com/uxcell-Converter-Regulator-Waterproof-Transformer/dp/B01H97ETP8/ref=sr_1_3?crid=20OG6Q6Q7OKOY&keywords=12v+to+19v+dc+step+up+converter&qid=1567281631&s=gateway&sprefix=12v+to+19v%2Caps%2C219&sr=8-3 - http://www.amazon.com/uxcell-Converter-Regulator-Waterproof- http://www.amazon.com/uxcell-Converter-Regulator-Waterproof-Transformer/dp/B01H97ETP8/ref=sr_1_3?crid=20OG6Q6Q7OKOY&keywords=12v+to+19v+dc+step+up+converter&qid=1567281631&s=gateway&sprefix=12v+to+19v%2Caps%2C219&sr=8-3 - Transformer/dp/B01H97ETP8/ref=sr_1_3?crid=20OG6Q6Q7OKOY&keywords=12v+to+19v+dc+step+up+converter&qid=1567281631&s=gateway&sprefix=12v+to+19v%2Caps%2C219&sr=8-3

  

Thanks Olddawgsrule. I;m around the same as you if I go to the mountains and don't use the fans. But its too hot in coastal NC to do that here.

Re that device, its a dc dc converter not a transformer so its not sine wave. If your laptop takes 19Vdc then it should work OK, Just watch that it doesn't overcharge the laptop battery. Probably it won'charge the laptop battery at all. And of course be sure that you get the polarity right. 

"its a dc dc converter not a transformer so its not sine wave."

And you are correct again! Overlooked that factoid.. Currently use my Wagen inverter to re-charge it.

"Just watch that it doesn't overcharge the laptop battery"

Shouldn't, I do believe the charge controller is built in the laptop. Main concern there is to match up amperage. There are smaller modules out there that produce 2a to 5a. That was the concern of the Tech at the Apple Store.

"Probably it won't charge the laptop battery at all"

You have me curious on this one..

"And of course be sure that you get the polarity right"

You betcha! I'm a stickler about that! I don't take anyone else's wiring for granted..

My inverter does the job, yet seems such a waste to run for just that.. And really, it's all I use it for. Bulky, inconvenient location, loses, etc.. I drives me nuts that I go DC to AC just to go back to DC again.

I'm probably jumping to a conclusion, I just looked at the Amazon reviews of the product and one guy said it ran his Dell laptop but didn't charge the laptop battery. Dell's BIOS doesn't allow battery charging from generic power supplies apparently.    But your laptop might be completely different. 

 

Thank you for that info. The Apple Tech was very specific about matching voltage/amperage. His statement was they don't recommend due to most really don't know how. Good folks over there! I was asked to bring in the info and he'd double check for me. 

Oh yes.. I grabbed you audit list to compare to mind and added some of your numbers. Again, good job there and thanks for sharing!

Screen shot mine using your chart.

Numbers look about right!

(example: car charger dell abc123x)

The Apple Tech did not even recommend what they sell for a car charger.. Which is why they were insist on me showing them the info on what I find. These laptop's are pretty fussy I guess..