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An alternative that you might like to consider would be a small 2 stroke 240v generator to power some mains operated power supplies.
It would depend a lot on your exact situation. If you are only going to use the batteries occasionally, you might not get as much service life out of them as you would wish. On the other hand frequent use would relieve you of the problem of running a long extension lead; on the other hand yet again, the generator could charge batteries on long astrocamps if that was what you are able to do. Just an alternative to consider against your intended usage.
Cheers,
Doug
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