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I am running a Skywatcher Fusion-120i mount.
The AC/DC adapter output is 13.7V=4.0A.
Question: Would a 17Ah work best?
Any suggestions.
Regards,
JackYour choice, but IMO it is difficult to have too much overkill.
If it is within your weight and financial budget go for something over-specified rather than anything less.
Paul
The specs on line say it has an (impressively large) 9.6v 45Ah internal battery, good for 10 hours operation eg
https://www.firstlightoptics.com/alt-azimuth-astronomy-mounts/sky-watcher-fusion-120i-synscan-mount-and-tripod.html
so if that is correct, a 17Ah external power pack is not going to increase the run time dramatically. How long do you want to run for?Cheers
RobinThe specs on line say it has an (impressively large) 9.6v 45Ah internal battery, good for 10 hours operation
I suspect 45Ah may be a typo and the battery is actually 4.5Ah even though the 45Ah figure appears everywhere on different sites.
Compare for example with the effectively identical Celestron branded version, here where a space has been used instead of the decimal point (9 5v 4 5Ah)
https://altairastro.com/celestron-nexstar-evolution-925×22-sct-6537-p.asp
That would be ok for the claimed 10 hrs just tracking (at ~0.5A) but a lot of slewing would take more power. What life do you typically get with the internal battery ? (If the internal battery is 4.5Ah then say 3 x that time with the 17Ahr power tank would seem reasonable given that you don’t want to run down lead acid batteries too low to prolong their life)Cheers
Robin
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