I just got a new Juicebox charger installed last night and had it plugged in for 8 hours however it only gave me 100km in range, is this normal? The JB is connected to a 240v outlet. Prior to coming home last night I had gone to a public L3 charger and charged my battery up to 80% so perhaps this was the best the JB could do seeing as I had charged previously?
New Juicebox charger
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Pay attention to the green bars to the left of the GOM and/or the battery % in the MyChevrolet app. This is a better indicator of battery state. The miles will vary based on driving patterns, temp, etc.. so it is not a good indicator of what did or didn't go into the battery during a charging session.
The GOM is only predicting based on past driving. 272km in winter could easily represent 100% range. If the car charged to 100% then the charger is working fine. Although take note that the JuiceBox does have the ability to cut off the power to the car before the car is finished charging. Also note that the car can stop itself from fully charging based on the time of use and rate preferences in the car.
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For US models (and I assume Canadian as well) there's a setting in the charging menu for hill top reserve that, if activated, prevents the battery from charging more than 80%. Chevy changed that for 2019 models so that you can set the max charge in either 5 or 10% increments (don't remember which). Check your owners manual for how to get to those settings and then make sure it's set for 100% if you want to charge that high.
That depends on how bad your efficiency is, but that does seem low. It should only take 9 hours to fully charge the car from dead empty (at the car's max charging rate of 7.7kW). What probably happened is that the car got full in the first three hours. The dash should tell you if it's fully charged. 272 km of winter range sounds like a full charge to me. That's 22kWh/100km, which is typical of what I see when it's around 0C outside.
Your electric company and/or charger may be able to show you how + when your charger was drawing current.
Like Max said, monitor the green bars on the left. If they're all there, you got full (5% increments). Range is irrelevant. If not full, then you have settings in the car not matching your expectations or settings in your charger.
Most likely would be a target charge % not 100. Less likely would be departure based charging that didn't get to complete.
Once you get it set right, the Bolt has an awesome set and forget settings. I recommend always using departure charging, so your battery is warm for no extra juice. And then, you're charging overnight while rates are cheapest and demand is lightest.
Like Max said, monitor the green bars on the left. If they're all there, you got full (5% increments). Range is irrelevant. If not full, then you have settings in the car not matching your expectations or settings in your charger.
Most likely would be a target charge % not 100. Less likely would be departure based charging that didn't get to complete.
Once you get it set right, the Bolt has an awesome set and forget settings. I recommend always using departure charging, so your battery is warm for no extra juice. And then, you're charging overnight while rates are cheapest and demand is lightest.
The JuiceBox has a web interface and app that shows you all sorts of info, including charge session current graphs. Note: Their Android App doesn't update the graphs correctly. No matter which session you select, it keeps redrawing the same graph, unless you switch orientations.
I had to plug in a cheap WiFi extender near the wall separating the garage from the rest of the house. It's about half the distance between the car and the WAP I'm connecting to. Amazon offers several, with varying costs and buyer reviews. Mine was ~$20, but was a PITA to set up right, so I won't recommend it. It's a crap-shoot.
You may be better off extending your *wired* network using a POE injector/splitter pair and installing another WAP in the garage.
Another issue might be that your car is set up to have the charge complete by (say) 9:00 AM and you took the car off the charger before it was ready. I'm just guessing here. I've got a Juicebox 40 and have had no issues with it. Come to think of it, the juicebox app has a dial on the second tab that I think can limit the charge the juicebox puts into the car. Another couple of items to consider. 
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