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LiPo4 v Gel choice?


shumbaman

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A 48 volt Li battery is rated at 6.5 Kwh and can be discharged to 80%DOD. This means that it has an effective maximum capacity of 5.2 Kwh or 108AH. It is also rated for 5000 cycles and costs R50K.

8* 200AH (12volt in a 48volt configuration) Gel batteries at 30%DOD gives an effective capacity of 120AH (equiv 5.76 Kwh). They are rated for 3000 cycles and cost R6k each for a total cost of R48K.

The cost and capacity of each of these options is almost the same but the cycles for the Li battery are much much better. Is it a no brainer or have I missed something out?

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5.2 * 5000 > 5.76 * 3000. So it would seem to be a no-brainer. Lithium also charges faster and can do higher discharge rates. Lead recycles easier though. So the only reason to go for Gel might be that you have concerns about that :-)

Don't take my opinion as gospel though, I might also be missing something.

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3 hours ago, CaTcH21 said:

I've been buying DC GEL batteries ( 12v200Ah ) for around R3.2k , and the ones im using are safe to discharge up to 75% of capacity. 400 cycles at 75%DoD .

Oooh  400 cycles is not where I would like to be at. >800 cycles is more inline with proper deep cycle batteries.

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21 minutes ago, Chris Hobson said:

Oooh  400 cycles is not where I would like to be at. >800 cycles is more inline with proper deep cycle batteries.

My minimum standard I want is 1600 cycles at 50% DOD - 4000 at 20% DOD.

Any batt that can matches or betters that, and not cost me an arm and a leg, interests me.

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18 hours ago, Chris Hobson said:

Oooh  400 cycles is not where I would like to be at. >800 cycles is more inline with proper deep cycle batteries.

Show me one Lead Acid battery that can provide even 800 cycles at 75% DoD

 

EDIT: Ok my info is a little inaccurate, see attached for a more accurate ref.

Battery.jpg

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