Having just tried such a jump starter yesterday, I'd say these are OK if the battery is not too discharged. Which is probably a very fine line on a diesel!
My battery was very discharged after the cold spell we'd had and being left for weeks without use. Tried to start it and just a click, after attempting to turn over once.
Borrowed my brother's jump starter - a "DBPower 250A / 500A peak 10800mAh" pack. This was fully charged. Connected it up, turned it on, waited for the green light, etc. Nothing but clicks when I tried to start. Left for a minute and tried again. Turned over but would not fire.
In the end gave it a quick charge for 30 minutes and it started. Then gave it a good run. The battery still needs a full charge to get it back to good health.
The pack I used it not as "powerful" as the other mentioned. But then are these all just numbers and can we trust any of them from a chinese no brand??
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