Hterag
lvl.4
Flight distance : 961978 ft
United Kingdom
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I wish manufacturers would stop focusing on the mAh in the promotional material... It's not particularly useful and, as has already been said, the available power depends on the voltage...
27Ah @ 5V = 135Wh
5.7Ah @ 22.8V = 129.96Wh
What this means is, technically, the pack has enough power in an ideal situation to charge one TB48 once, but changing voltages is pretty inefficient, with a specially made system you may just about get 90-95% efficiency (again, ideal world) but then you'd need (I just checked the output of the stock charger - 26.3V @ 3.83A) to get at least 22.16A out of that 5V pack when most of them are designed to put out around 1-2A...
I hope this goes some way to clarify the differences in battery capacity between devices.
EDIT: Wait, I may need to take some of that back, I didn't realise the pack had an AC output... Is that right? How efficient is that? Now I'm very curious because it suddenly became more viable...
EDIT2: According to the manual for the "18K" model, "At a 65W load, an operating time of 1 to 1.5 hours or more can be expected." Which means we could get to about 65% of the TB47 (100Wh) in one hour. If we assume the, "27K" model has 50% more power, then that might give us just enough for one charge of the TB47...
These numbers are with the, "1" of the, "1 to 1.5 hours" expected life, if it lasts 1.5 then it'd be enough for one charge of the TB48, too. Only concern I'd have at this point is whether it can output 100W continuously for an hour or so. If it can, it's a lot cheaper than the DJI batteries... As long as you don't mind the wait between flights.
EDIT3: So, according to the manual, it's able to output a maximum of 85W, that's not enough to charge using the standard DJI charger, unfortunately.
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