Battery Pack? Answered

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Hello everyone, 

I want to build a battery pack so that I can charge it with solar.  i bought some 12v 1.3ah sealed lead acid batteries but they don't do the job that I want to and they are not very appealing.  So I have seen the tesla powerwall and it is great and also slim, so what I want to do is to buy different batteries which are the panasonic 18650 and the stack them together to my own specifications so that they can power small things such as lights and pumps.  The packs that I will make would be small at first just to test and have an idea.

So is it worth investing in these battery types or just buy some sealed lead batteries and then stack them together. 

Thanks

Discussions

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rickharris

4 years ago

So in there is a question?

Mmmm. Lipo are expensive, have a finite life and are picky in charge and discharge characteristics. In addition they may/can burst into flames at the drop of a hat - or at least if they are abused.

SLA on the other hand are rugged, have a very long usable life (think how old your cr battery may be), if well treated and a high energy density.

What voltage do you want to produce?

How large will your solar aray be?

What sort of load do you want to put on the battery pack.

My lights consume about 100 watts, My hob about 7,000 watts and the oven about 4,000 watts.

My personal solar array produces 4,000 watts on a summer day and about 800 watts on a cloudy or winters day. Each panel produces 40 volts which drives an inverter,

A car battery producing 70 Ahr should be easily available.

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icengrickharris

Answer 4 years ago

I would like to know, if UK weather ever damages your arrays ?

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rickharrisiceng

Answer 4 years ago

Not at all. they are on the roof, 16 panels. Apart from getting dirty so I have to hose them off twice a year they appear no problems at all. been up there for 2 years now.

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icengrickharris

Answer 4 years ago

Good to hear, up here in the desert and mountains we get golf ball hail.

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rickharrisiceng

Answer 4 years ago

UKhas a very temperate climate. Snow some time hail pea sized but not very big. Actually I live in the dryest part

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Chamburn

4 years ago

Thank you all for your answers. What I wanted mainly was to know whether or not to build custom battery pack or just buy these simple sealed lead battery because I want to make small things and then power them. I currently have a 10 watt solar panel and with a 12v 1.3ah sealed lead acid that I charge during the day and then use to power my lights at night and run an air pump, but that is not enough. So based on your answers I will buy the sealed battery and also add additional panels.

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Downunder35m

4 years ago

You want to invest multiple times of what decent solar batteries costs in LiPo batteries.
You only have an idea so far, or I missed the hardware specs in your posting.
IMHO you are just wasting money!
Solar batteries are all "deep cycle" batteries as they are constanly charged and discharged, a 18650 is a really bad choice here.
Then there is the problem of chargin them, standard is 40-48V for solar panels and inverters.
Which means you need a truck load of batteries to get what you want.

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iceng

4 years ago

Hard to understand what you really like and need.

Also you do not mention what kind of soar collector you have or are planning to use.