AGM Batt on Trickle Charge?

Hi,

It is very expensive and doesn't include a solar panel.

If it's not too late, I'd like the group's thoughts on this:

http://www.goalzero.com/p/164/goal-zero-yeti-150-solar-generator/22:2/#tech-specs

The is the Goal Zero Yeti 150, which is battery (14ah) + inverter (80w MSW) + charger + 12v 10a output. Expensive, yes, but is it "overpriced"? Currently I'm likie for the convenience factor, and it's about the same amount I'll have to spend on separate items.

Downside: while the battery is swappable, if you want to leapfrog (alternate) charge your batts you have to buy 2 of these, or else a separate charger.

There is recommended max charging current. For AGM (other than Lifeline) it's typically 0.3C.

No, Powerfilm tarp doesn't include controller. Their website lists "controller" wherever they mention rollable panels or kits though. Under the "suggested accessories" (or included indeed, if it's a kit).

Lithium??? Lifleline cycle life ???? ...

What was the question again? :)

I would recommend you buy this one instead.
http://www.ebay.com/itm/221335417310

They're made in the USA (some company in Wisconsin). Cheaper too at $35 shipped.
I just bought another.

AND I just junked my made in China UPG 1280 (12V 8AH) battery.
Not abused, only about a year old. Really not impressed by UPG batts.


edit: looks like that Ebay guy is currently out of stock. Hope he gets more in - I like these.

Almot wrote:
12lb AGM isn't much, then another 5-8lb panel, then another 20-40lb of all other gear and food. When it's on your back, every ounce matters. Batteries are not just heavy, but also bulky and not an optimal shape for carrying on your back. I wouldn't want to carry 24lb of 2*18AH, with all other gear. In fact, wouldn't want to carry more than 10lb total ;)

Lithiums time (for solar) probably hasn't come yet. Not only because of the price. Controller for lithiums has to have all the setpoints fully adjustable (with Float disabled), and for this particular application it has to be small, weatherproof and with temp sensor - don't know if there is any model that fits all these requirements.

Even though he's sledding, you're right, it is weight. It's difficult to figure the logistics since we don't know what type of terrain or ground/snow pack and for how much distance, preference, etc.

Max current 1.8A ??? Powerfilm tarp included controller ???
Lithium ??? Lifleline cycle life ???? ...

LOL

12lb AGM isn't much, then another 5-8lb panel, then another 20-40lb of all other gear and food. When it's on your back, every ounce matters. Batteries are not just heavy, but also bulky and not an optimal shape for carrying on your back. I wouldn't want to carry 24lb of 2*18AH, with all other gear. In fact, wouldn't want to carry more than 10lb total ;)

Lithiums time (for solar) probably hasn't come yet. Not only because of the price. Controller for lithiums has to have all the setpoints fully adjustable (with Float disabled), and for this particular application it has to be small, weatherproof and with temp sensor - don't know if there is any model that fits all these requirements.

Almot wrote:

red31 wrote:
Why not use the chart previously linked in the battery specs???

OK. At 100% discharge you have 200-250 cycles before the capacity drops to somewhere between 50% and 90% of the initial.

I would consider lithium. Twice lighter, and life cycle at 100% discharge is longer. Expensive, yes.

Guy, I'm gonna' disagree with you on this one (it doesn't happen often :B), i.e. the lithium.

From what I'm understanding is that this system is for pack-in skiing adventures and is basically an experiment for having power at camp. I would start with a relatively inexpensive battery, a sealed lead acid type and probably bigger than 18 AH or at least two of them to make storage less of an issue. I could see them being charged during the day and one reserved for nighttime use to power lights or extension of charging electronic devices. I'm sure the OP can work out the fine details.
Spending significant money for lithium batteries and a charger just doesn't seem to make practical sense when the 18AH sealed batteries can be had for $35. If one of these type lasts 200 cycles, there should be a lot of use in Ski-days before replacement.

red31 wrote:
Why not use the chart previously linked in the battery specs???

OK. At 100% discharge you have 200-250 cycles before the capacity drops to somewhere between 50% and 90% of the initial.

I would consider lithium. Twice lighter, and life cycle at 100% discharge is longer. Expensive, yes.

Why not use the chart previously linked in the battery specs???

It shows how the capacity goes up over 100% and down to 50% capacity left for three different discharge regimes.