G'day Andrew,

Your best bet will be to double-check the instruction manual that you can download at the bottom of the specifications section to check battery size, but yes, you should be able to fit a maximum 140Ah LiFePO4.

The Posi-Fit plug is specific to Engel, Wade. You can probably make up something that will convert it to a standard cig socket, although a more secure way about it would be to convert the cig socket to a Posi-fit. You'll probably need to search around some electronics and 12V shops to find the bits you need though.

G'day Darrell,

The Smart Battery Box can be used with batteries from 60Ahr to 140Ahr. So you shouldn't have a problem with your 80Ahr or 98Ahr battery.

G'day Peter,

Great question, you can use the battery box to jump-start a car, there are a few things to consider. If you use a cold cranking battery in the box you can just connect it and then start the engine. If you use a deep cycle battery in the box then you'll need to connect it for an hour to charge and then start the engine. On the left hand end under the little hatch there are standard battery terminals you can connect your jumper leads to.

G'day Rod,

The Engel Smart Battery Box can be connected to solar by an Anderson plug, the battery box does not have its own regulator so your solar panel would need to have its own regulator in-line. You can find the Anderson plug outlet on the side of the unit. 

G'day Jez,

The Engel Battery Box is not internally regulated for solar. An external Lifepo Lithium regulator is required. 

G'day Joe,

I've not been able to get a direct answer from Engel however everything in their User Manual stipulates they are only compatible with batteries up to 140AHr so unfortunately, I don't think it's going to be compatible with your 145Ah battery.

G'day Casey,

If your fridge and lights both have a normal 12V cig-plug you could grab yourself a double cig-plug adapter from somewhere like Jaycar, this should be fine as long as you don't exceed the limit of the adapter (usually around 10AMP). Alternately you could grab an Anderson to 12V cig adapter and run one of them from that output.  

G'day Lyn,

The Engel Smart Battery Box Series 2 is just an inverter box so doesn't actually have an internal battery, you would need to purchase a deep cycle battery separately to use in the unit. If you're needing to run a 12V fan while away from your vehicle then you could grab a CoolPower RAPS44 Power Pack, Goal Zero Yeti 150 or Companion Power Pack 44Ah depending on how many amps your fan draws and how long you'd like to run it for.

G'day Adrian,

Providing you have a regulator or charge controller on the solar panel, you should have no issues charging simultaneously. 

G'day Annette,

You can use as large a sized solar panel as you like with the Engel Smart Battery Box Series 2, as long as the solar panel has an inbuilt charge controller, which most will have these days.  Hope that helps.

G'dau Greig,

I've just double checked this and I can confirm that the Smart Battery Box Series 2 comes with a 12v and 240v cable.

G'day Billy-Ray,

Yes, you absolutely can charge and discharge at the same time. Its really important to note though, if charging your Engle Smart Battery Box Series 2 with solar panels, the charge goes directly to the battery and NOT through the Smart System.  In this case, you will need to use any solar system with a regulator.