Replace geo conversion 48 volt battery pack

[jmygann]

would like 35 mi range

http://www.evalbum.com/994


replace with LIFEPO4 ....


http://cgi.ebay.com/Prius-Plugin-Conversion-Lithium-Ion-Battery-12V-40AH_W0QQitemZ190327408932QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item2c5065c924

http://cgi.ebay.com/Prius-Plugin-PHEV-Conversion-Kit-with-Lithium-Ion_W0QQitemZ200344551230QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item2ea5773f3e

http://cgi.ebay.com/Prius-Plugin-PHEV-Conversion-Kit-with-Lithium-Ion-4KWH_W0QQitemZ200382634989QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item2ea7bc5bed

OR

NiMH ......

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=200417735494&viewitem=&sspagename=STRK%3AMEWAX%3AIT

Any suggestions ?

 

[morph999]

only 48v? Can you tell me how much your EV conversion cost? That sounds like exactly what I'd like to do with my car.

 

[morph999]

would like 35 mi range

http://www.evalbum.com/994
replace with LIFEPO4 ....

http://cgi.ebay.com/Prius-Plugin-Conversion-Lithium-Ion-Battery-12V-40AH_W0QQitemZ190327408932QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item2c5065c924

http://cgi.ebay.com/Prius-Plugin-PHEV-Conversion-Kit-with-Lithium-Ion_W0QQitemZ200344551230QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item2ea5773f3e

http://cgi.ebay.com/Prius-Plugin-PHEV-Conversion-Kit-with-Lithium-Ion-4KWH_W0QQitemZ200382634989QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item2ea7bc5bed
?

Those are just Thundersky cells. I'm actually buying some of those myself soon. Not sure how much those are but you can also buy them here:

http://www.evcomponents.com/ProductDetails.asp?ProductCode=TS%2DLFP40AHA

so $44 per cell....48v 40ah would be about $700 (I think???)... that's off the top of my head. You might need more than 48v40ah though to get 35 mile range. You probably need more like 160 AH cells...like this
http://www.evcomponents.com/ProductDetails.asp?ProductCode=TS%2DLFP160AHA

which would be $2800. I don't know the mileage that a car gets per AH, though. Lifepo4, if it's good quality, will always be the better buy over NIMH. At least right now, because NIMH is way too expensive for what it delivers. Lifepo4, will give you 2000 charges or more. NIMH will barely give you 500 charges. And they are roughly the same price.

 

[morph999]

All 3 of those deals are rip-offs. The middle deal that you had on Ebay...shows 16 40AH cells for $2000. The deal I showed you, gave you 16 40AH cells for $700. Now, you would just need a BMS for it so that you don't screw up the batteries and you'll be set. You could probably find a good BMS for $200 - $300. So you'd be saving $1000 by going with evcomponents and hooking it up yourself.

 

[jmygann]

I have about $3000 in the Geo

I guess it is really the cost of "Watt hours" and the number of cycles one can get

I currently have say 50 volts at 200 amp hrs = 10,000 WH 10KWH

so at 50 volts I figure I need about 300+ amphrs to go 35 miles

cells are 3.2 V so i need 15 3.2 cells to get to 50 Volts

$330.00 x 15 3.2V cells =$4950 ??? is that close ?

http://www.evcomponents.com/ProductDetails.asp?ProductCode=TS-LFP300AHA

I am thinking around $.34 / WH ??

trojan t-105 deep cycle ... $.11 WH

 

[morph999]

I'm not familiar with how many amp hours a car needs to go 35 miles. You can ask in the "Electric vehicles" forum here or you can go to a forum called "diyelectriccars.com" ...something like that...diyelectriccars...look up electric car forum on google and you should find it. They are the pioneers in this stuff. They are doing the same thing you are over there.

here's the forum...really popular with electric car enthusiasts....here is a thread talking about the thundersky 200ah cells which is what you are looking at. I wouldn't bother with Prius batteries...I'd go straight for the thundersky cells and configure it yourself. Here you can ask them about it on this forum...
http://www.diyelectriccar.com/forums/showthread.php/thundersky-200ah-temp-test-39798.html

BTW, if you are using 200 amp/hr cells on SLA (lead acid)..you might only need 160ah with lifepo4 to get the same distance because with Lead acid batteries, you can only use 60 % of it's capacity whereas with Lifepo4 , you can use 90 %.

 

[TylerDurden]

Oatnet used headways in his VW camper conversion. You might give him a PM.

 

[dogman dan]

Bear in mind that when you switch from lead acid to lifepo4, you won't be tied to 50% depth of discharge anymore. So 200 ah of lifepo4 will take you farther than you get now, not to mention the lifepo4 is half the weight. But unfortunately, you are going to spend a lot more than $2,000 for a lifepo4 pack that can take your geo very far. Theoretically it will go three times the cycles, so paying three times the amount you pay now for a lead acid pack is reasonable.

So that makes those 300's look good to me. The real benefits will be the ability to discharge deeper without harm and cutting the weight.