If you want a really simple box that will charge from anything (solar, car, mains) I can recommend the Ecoflow delta mini. I have one for my HGV and it can power the microwave or the kettle with no fuss, and it’s around the size of a shoebox. However 880Wh is probably overkill for charging drones to be fair.
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… also …
Mine was £500 on eBay, so it’s only £200 over budget
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It maybe over budget this time, but literally I’m just getting things together for a trial run in the Rav4, doing that for a couple of years, then onto hopefully something bigger.
So the budget maybe over this time, but I can keep your suggestion in mind.
Cheers mate👍
I still think something like 130Ah Leisure battery in the back of the car, VSR or DC-DC charger to charge it from Car Battery, is probably the best idea. That’s what i use in my van along with a 100w solar panel. 130Ah battery is 1560 Wh. Inverter is whatever size you need, but if going for a big one, double the Leisure battery and create a 1S2P bank. You will get losses if you convert DC to AC.
Upgrades beyond, LTO battery pack (30,000 cycles), maybe a semi flexible 100w solar panel on the roof for in the field charging.
Battery banks you actually carry with you are generally heavy. I started to build one based on a 40Ah battery that could recharge my lipos in the field, but realised it’s just as easy to walk back to the van, put the kettle on and recharge Lipos while I have a coffee and a bite to eat. if I run the B6 and the 3x e3 chargers I can charge 10 2S or 5-6 3S in an hour or so. I don’t know for DJI batteries, though. Lipos are easy to charge. I think anything with tons of electronics will be less so and you will lose access to the direct from DC charging which is quite a lot more powerful than AC (my B6 charges at less amps froim AC than direct from DC).
The 130Ah leisure battery and 200w solar panels were my first step.
Main usage a camping fridge/freezer (compressor) being the main item … so, even with British sunshine it’s kept ahead of the game, and did superbly!
Now also have a Jackery Explorer 1000 (W) which provides all the current connectivity - Qualcom 3.0 USB-A Quick-Charge, USB-A 2.4A, USB-C, 10amp car socket and 2 x13A 1kw pure sine.
Currently on Amazon at £734 (which is 30% off usual £1,049!)
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I must be in the wrong job, either that or I have my priorities totally wrong!!! 
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Some good fortune came my way … it didn’t cost me anywhere near that much.
And - fact is - I’d never have bought one (even at that low price) had it not.
river 500 charges at 1 hour from homes charge and you can get 200 watt max a hour on solar.
You can also add a battery to bottom of pack plus 200 wh and can add a app to phone to turn on and off and slow charge it
They’re all much the same. 1000 meets ALL my needs and some.
Mine would have been charging better if the sun hadn’t been at about 20°. I was being lazy.
Still charging at 75W in the late evening sun! 
And it always depends on needs. I wanted the Qualcom 3.0, that’s not supported by the River 2 Max. (Afaik - if it is, then they fail on their marketing. Did a lot of comparisons with several makes. Was undecided until the 30% off popped up. It became a no-brainer, then … for me.)
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Cheers mate, bit of background checks and I’ve bought one. Comes tomorrow, getting a battery for it going to Anglsey Sunday job done
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Wow that was quick, I wouldn’t be without mine … will look forward to seeing some footage Anglesey is beautiful
Its the price 1 kw are expensive at moment 500watt battery pack will last you all say and inverter built in
I have a jackory 500 their good but mine takes 7 hours to charge and only allows 90 watt on solar a hour
There’s another question that I need to ask…what darn car /leisure battery would I need or is best to run the Inverter which I’ve ordered? 
I’ve never been able to get me head around electricals, I don’t think anythings going to change any time soon either🤪
Any info most helpful👍.
And for anyone who’s at the big meet, hope your having a good one👍
What are you wanting to supply … and for how long?
Chances are nothing bigger than a 130Ah Leisure. For one main reason … they just get too heavy.
If this is just for off-grid charging/running of things … DON’T get a “car battery” … get a Leisure battery.
The difference is that a Leisure withstands repeatedly being discharged to a far lower level than a car battery. Car batteries are designed to provide high current [for starting] for brief periods. Leisure batteries for lower current for far longer periods.
Cheers Dave👍.
Yeh, I’ve been reading up a bit, and was edging towards a leisure for the reason you’ve mentioned above.
There was a small part of me (the tight arse part😂) that was thinking about a normal car one, but as you’ve said, their main use is for short bursts of high energy as opposed to prolonged use.
So if its a leisure I need, what specs of lead acid would I need?
The use would mainly be for charging drone batteries, but also leave a bit of scope for maybe running stuff🤷♂️
Which drone? How many battery charges? How much spare for “stuff”?
you need a deep Cyckle battery,About 270 wh for a 3kw inverter.Very expensive
Just running an 1100w converter