ebay link herehttps://www.ebay.com.au/itm/121957836096
I'm keen to make sure the hardware and batteries don't suffer when the power gets low. Hoping I can find a way to monitor the remaining charge remotely.
the camera (Ixus 160)
"...I've been assembling items for the remote battery solution of my dreams, for off grid, extended time-lapse..."Any suggestions would be most welcome on this project. I'm keen to make sure the hardware and batteries don't suffer when the power gets low. Hoping I can find a way to monitor the remaining charge remotely.
And do I understand correctly that something you call a "peak current event" might not be able to pull enough current through a cheap device as shown above?
Do you want it to run unattended for a week, shorter or longer?
Would it be possible to use a (small) solar cell at the site?
What is the power consumption of your complete rig?
Do you have a welding tool at hand
Reading your mail you suggest that your rig needs some 200watt/day. I won't go into system losses of chargers/converters, but let's say 10% more is actually needed.In your first post you suggested li-ion batteries...you'd need some 24x18650 per day or 1 cel per hour to make that work.
Charging those via a solar cell would need a complex charger because of the risk of overcharging li-ion while under load (think back on phones that caught fire while charging)the other option is to build multiple packs that you exchange and charge at home.
Looking at your requirements and skills my first thought is to go for NimH or PB-gel because they can simply be put on a float charge.
I won't go into the 100 NimH per day setup, because I am thinking that is not for you.
Pb is heavy and larger than nimh but easyest to set up and stable even with a crappy wall mart charger or intermittant solar charger.
So for 200 watt you need 12V16Ah as a minimum (if you do run it dry the pb batterie will die) Security comes with overcapactity, longetivity of PB cells with never running it below 50% of capacity. This means 12V/32Ah per day would be ideal, but 12V/20Ah would suffice.Looking at a couple of days this suggest a truck or large car batterie (or 2), just to give you an idea of what you are looking at.
Using a buck step down converter (ebay) like the LM2596S you would be able to create a stable 4.2/8.4V for the camera and 5V for the raspberry.
And you would only need your soldering iron to attach a few leads. Is this what you mean with entry level?
If you want to compensate that with a solar panel it would suggest you need something like a 50watt panel, that is about 1/4-1/2 m2 solar panel and with a simple steca charge controller it can keep that PB batterie charged.
You could do with less depending on sun conditions in your location, but even a 50 watt panel will not manage this around xmas where I live or on heavy clouded days. (needed sun hours per day >4) However it wil be enough for 10 month a year and could possibly keep your batterie capacity slightly smaller.
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