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Dan W

@kudra the thing you need to remember about EVs vs Off Grid power; a typical mobile off grid setup would be between 100Ah and 500Ah at 12v (between 1.2 and 6kWh).
A fixed off grid array may have the equivalent of x24 12V LiFePO3 100Ah battery’s (about 30kWh)
Even a small EV like a Leaf or an EQA will have at least 30kWh.
A single drive Tesla is over 60 and a dual drive is over 80kWh.

The only practical way is either a (vender specific) mobile workshop battery swap or a diesel generator on a diesel truck.

20 March at 7:45 | Wall-to-wall | Open on aus.social
5 comments
Kudra :maybe_verified:
Dan W

@kudra
Interesting.
3.35kWh per unit.

Each unit can put out 20kW.

If they can sustain that output, an array of four if them may be able to charge a Dual-Drive Tesla within an hour.
Heat buildup from that sort of current would be an issue…

sparkcharge.io/pages/roadie-po

20 March at 8:02 | Open on aus.social
Kudra :maybe_verified:

@Salvo definitely. I'd hope the people building these have taken that into consideration! - you could be smart charging the modules based on how recently they had been discharged, then loading them into the rescue vehicle as needed... I'd say the majority of uses are going to be when a planned charge cannot happen due to faulty charger or random incompatibility (had happened to me a couple times but I was able to get to the nearest charger, but in some areas that may be a problem, particularly rural Australia!) and you won't need to be charging the vehicle to 100 percent, just to the nearest static DC charger.

@Salvo definitely. I'd hope the people building these have taken that into consideration! - you could be smart charging the modules based on how recently they had been discharged, then loading them into the rescue vehicle as needed... I'd say the majority of uses are going to be when a planned charge cannot happen due to faulty charger or random incompatibility (had happened to me a couple times but I was able to get to the nearest charger, but in some areas that may be a problem, particularly rural...

20 March at 8:10 | Open on aus.social
Dan W

@kudra looking at the size of the units, and looking how much charge they claim to hold, I gave a feeling that they are fudging some of their numbers or my maths are incorrect.

If 4 units is enough to charge a dual drive, you wouldn’t be able to carry them around.

20 March at 8:17 | Open on aus.social
Kudra :maybe_verified: replied to Dan

@Salvo enough to get them to the nearest charger only perhaps, not fully charged?

20 March at 9:26 | Open on aus.social
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