Reddit reviews RoadPro RPPSAPS 12V Battery Clip-On and Cigarette Lighter Adapter

You can get clips already wired to an accessory outlet.

https://www.amazon.com/Roadpro-Battery-Cigarette-Lighter-Adapter/dp/B00065L2D8

that'd do it; i don't know why you'd need two inverters though.

also you want a deep cycle battery rather than a regular car one as car batteries are designed for short bursts of high energy rather than a sustained drain. deep cycle batteries are used for running the electricity on boats and RVs. make sure to get one that's "100ah" or higher. that's essentially the amount of power available in the battery and the more you have the longer you can power your stuff. you can get two and connect them in parallel (google image this for a diagram) to increase your available energy.

you'll also want to get a battery charge reader so you can monitor how much charge the battery has. a full charged battery is 12.6v, and you should turn everything off and recharge if you dip down to 12v as that's around 50% charge and anything less than that will actually kill your battery and it won't charge again.

definitely don't do the gennie, we have enough air and noise pollution out there...


battery
http://www.amazon.com/Universal-Power-Group-45978-Battery/dp/B0044Z8DJW/ref=sr_1_1?ie=UTF8&qid=1374787029&sr=8-1&keywords=UPG+UB121000

combine these two items to create a battery charge reader
http://www.amazon.com/gp/product/B00065L2D8/ref=oh_details_o00_s01_i02?ie=UTF8&psc=1
http://www.amazon.com/gp/product/B000EVWDU0/ref=wms_ohs_product?ie=UTF8&psc=1

You really don't want an inverter. That would just go from DC to AC and back to DC again for no reason. Each conversion lowers the efficiency and wastes energy. The inverter would also be more expensive than just buying a 12vDC to 20vDC adapter.

A much better solution would be to get both of these and use them together:

https://www.amazon.com/Roadpro-Battery-Cigarette-Lighter-Adapter/dp/B00065L2D8

https://www.savingology.com/ProductDetails.asp?ProductCode=Car-12V-Apple-MD212LL-A-EGR&click=2&gclid=COC9lOaGs9MCFYdMDQod0LIPTg

The first plug just gives you a cigarette lighter plug at 12vDC. The second will convert the voltage to 20vdc at 4.25A and charge your laptop.

Best solution I have off the top of my head: get yourself a car battery or some other 12v DC power source and use a cigarrette lighter adapter

Then you don't need to buy any new Hero 3 accessories. Or, if you were implying that you want your current backup batteries as the power source, you can probably make use of one of these. Never tried one, but if you can find one that's the right size for the charger you currently have you should be in business.

Wow! Thank you you've answered all my questions about power needs.

Now all I need to figure out is details of actual wiring and construction.

Is it really as simple as this diagram would imply? Can I hook a fan like this one up to it directly or would I need an intermediary?

Would I be able to split it off into a car power thingy to charge phones and the like?

Thank you again.

*Forgot the fan. Also do you know if 90CFM is enough airflow for an air cooler? From the tutorials I've seen it should be, but more I'm thinking would be better, no?

Assuming you mean that the cooling box uses 0.55 amps, this should be reasonably doable. Get a cable adapter like this one to connect the 12-volt outlets to the battery. Then plug the cooler and any other accessories into the splitter. I see no reason why plugging the cooler into this setup would damage it, so long as you make sure to connect the battery in the correct polarity (red to +, black to -). You can use the built-in USB port on your splitter, but beware that the output may be poorly regulated or undersized if it's from a cheap manufacturer. I would say that a power inverter isn't necessary, but if you get one be sure to only plug it in when you need it, rather than all the time. Inverters use a lot of quiescent power.

Oh boy you're in for a treat! You can run those off of any 12v battery, you just need to connect it like this or if you are feeling janky, you can just connect directly to the little plug. Gimme an hour or so and I can get you some pictures of what I mean.

So something like this connected to the battery under the seat?

We use the same hmmwv, no armor. There are 2 latches under the passenger seat. One up front, one on the side. Unlatch them and you will be able to lift the seat from the front. caption There is a small gap you will be able to run the wire out once you clipped the leads on the terminals. You could get something like this. This but the wire might not be long enough and the clamps might not be large enough but you get the idea. RadioShack will have all the parts & pieces too. Item of interest; there are 2 batteries under that seat (since it's a 24v system) running in parallel (not series right?) So make sure when you clamp your leads you do them both on the same battery and not the + of one and - of the other bc your charger is meant for 12v. You guys don't have LMTV?

No problem. Do you have the cigarette outlet style adapter? If so, then you need something like this: http://www.amazon.com/Roadpro-Battery-Cigarette-Lighter-Adapter/dp/B00065L2D8

http://www.amazon.com/Roadpro-Battery-Clip-On-Cigarette-Lighter/dp/B00065L2D8/ref=pd_bxgy_auto_img_z

just add car battery and cigarette lighter adapter to multiple outlets

You just need a reasonably large automotive battery and an inverter.

Something like this, one of these, and a car battery. Use a deep cycle battery if you plan on using this regularly, and pick up a battery charger. Otherwise you can just plug it into the battery in your car, if that works.