Battery Jump Pack Sizing?

[bipolardave]

I've been eyeing some portable battery packs for some time and finally took the plunge and picked up several for our daily drivers and motorcycle. I even picked up on for my office.

Anyway, I'm trying to size one for my W115 with series glow plugs. Although the engine is in the process of being rebuilt, on cold days it used to require about 45 seconds of glowing before it would reliably light off. I suspect that time will diminish substantially with like new compression.

I've read that each glow plug draws about 10 amps when cold but that gradually decreases to 4 amps once up to temperature. Without taking that decrease into account, I'd need something that could provide 500 watts of power for up to a minute and then still be able to light off the engine.

The marketing material across the board will state up to what size engine each model is capable of starting, either petrol or diesel. However, I have found any that takes into account glow plug operations for an extended period of time. Specifically, can it provide that sort of power for extended times without going flat or overheating?

I was intersted in the Noco GB70. Their online chat "specialists" says that it should start my 240 without breaking a sweat. However, I'm not sure they were taking into account glow plugs operating.

This is the model I'm looking at:


https://www.amazon.com/NOCO-GB70-UltraSafe-Lithium-Starter/dp/B016UG6PWE

Doe anyone keep battery packs at the ready for their diesels? Any insight to share?