12-25-2018, 04:51 PM | #1 |
Not Yet Wild
Join Date: Jul 2010
Posts: 46
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EZGO 2Five Lithium Conversion Question
I am thinking of converting my 2014 2Five to lithium and wanted to know if this would be a good battery pack option. I am considering the 12V 100Ah version which has an internal BMS:
https://www.alibaba.com/product-detail/Rechargeable-lifepo4-26650-32650-lithium-battery_60701390415.html?spm=a2700.7724838.2017115 .95.3760421dnOYtiN[/URL] Battery Type LiFePO4 Nominal Voltage 12.8V Nominal Capacity 100Ah Energy 1.28KWh Internal Resistance ≤20mΩ Series & Parallel Application up to 4 series 4 parallel connected application Limited Charge Voltage 14.6±0.2V Floating Charge Voltage 13.8±0.2V Charge Method CC/CV Discharge Cut-off Voltage 10.0V Standard Charge Current 60A Max. Charge Current 80A Standard Continuous Discharge Current 80A Max. Continuous Discharge Current (<30min) 100A Pulse Discharge Current (<3s) 350A Cycle Life > 3000 cycles Dimension (mm) Length: 323±2 Width: 171±2 Height: 232±2 Weight 15.5±0.2Kg Charge Temperature Range 0~45℃ Discharge Temperature Range -20~60℃ Recommended Operating Temperature 15~35℃ Self-Discharge Rate (Residual capacity) ≤3%/month; ≤15%/years Self-Discharge Rate (Reversible capacity) ≤1.5%/month; ≤8%/years Storage Temperature & Humidity Range (Less than 1 month) -20~35℃, 45~75%RH Storage Temperature & Humidity Range (Less than 3 months) -10~35℃, 45~75%RH Recommended Storage Temperature & Humidity Range 15~35℃,45~75%RH |
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12-25-2018, 06:55 PM | #2 | |
Gone Insane
Join Date: Oct 2015
Location: TN/NC/GA Tri-state area
Posts: 3,952
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Re: EZGO 2Five Lithium Conversion Question
Quote:
You will be returning them, or end up stuck with them if they will not accept returns... after your first attempt to drive the 2Five in a normal manner. The BMS in each of those 12V packs cannot withstand the peak impulse current that they are supposedly "rated" for. One or more of them will do a protection shutdown, creating an open circuit on the total pack. This will destroy your controller from the resulting inductive spike not being absorbable by the pack. This has already been attempted. You will be repeating those failures. Bob |
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12-26-2018, 04:08 PM | #3 | |
Not Yet Wild
Join Date: Jul 2010
Posts: 46
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Re: EZGO 2Five Lithium Conversion Question
Quote:
https://www.elitepowersolutions.com/...ion-batteries/ |
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12-26-2018, 07:24 PM | #4 | |
Gone Insane
Join Date: Oct 2015
Location: TN/NC/GA Tri-state area
Posts: 3,952
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Re: EZGO 2Five Lithium Conversion Question
Quote:
http://www.buggiesgonewild.com/road-...ml#post1441665 32 of them will be used for that project, which leaves 16 cells left over. I'll be using those 16 cells for my 2Five lithium conversion. The onboard charger can be used, as the lithium cells can accept a wide range of charge rates. I suggest that you allow whichever BMS you choose to use control the charger. Bob |
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12-27-2018, 01:56 PM | #5 | |
Not Yet Wild
Join Date: Jul 2010
Posts: 46
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Re: EZGO 2Five Lithium Conversion Question
Quote:
How do you set it up / wire it such that the BMS controls the charger? I am a noob and do not want to screw anything up! |
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12-27-2018, 03:35 PM | #6 | |
Gone Insane
Join Date: Oct 2015
Location: TN/NC/GA Tri-state area
Posts: 3,952
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Re: EZGO 2Five Lithium Conversion Question
Quote:
http://www.buggiesgonewild.com/elect...ml#post1505943 Bob |
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12-28-2018, 11:26 PM | #7 | |
Not Yet Wild
Join Date: Jul 2010
Posts: 46
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Re: EZGO 2Five Lithium Conversion Question
Quote:
1. I would like to avoid having to wire the relay / charger control box to manage the on board charger. If I do not use a relay and use a 7 module leaf pack, which one of the lithium reprogramming profiles in the attached link would work best with the existing on board charger? https://www.emf-power.com/product/de...q-programming/ 2. Does the link you provided to the pre-programmed 14 cell BMS on ebay work as is (i.e. is “pre-programmed”) or do I need to make sure it is a specific version so it has the correct programming for a 7 module leaf pack? 3. I saw the BMS wiring diagram and was wondering if you had an actual picture of how you wired it before you covered it with the white plastic. 4. Can you confirm I do not need to use an SB120 connector and can just use 2 gauge terminal lug connectors to connect the battery pack to the controller (I would expect to need to upgrade the existing cables from the controller to the battery pack with 2 gauge cables)? 5. Do you recommend any specific bus bars and what did you use for the positive and negative terminals for the 2 gauge cables with the terminal lugs to attach to? 6. cgtech mentions “I hook the bms interlock up to interrupt the controller's throttle input.”. How does that change your BMS wiring diagram? Sorry for all the questions, but want to make sure I get everything right. |
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12-29-2018, 01:42 AM | #8 | |
Gone Insane
Join Date: Oct 2015
Location: TN/NC/GA Tri-state area
Posts: 3,952
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Re: EZGO 2Five Lithium Conversion Question
Quote:
The BMS PCB that I linked to is preprogrammed with the voltages to match the 7 leaf module configuration. It requires the relay to handle not only the charger, but also the LVCO (low voltage cutoff). The relay is powered by the output of the BMS. I used the seperate electrical box because the relay that I ended up using was too large to fit in the BMS box. I ended up buying a 4PDT relay because the first relay was described wrong on eBay. A DPDT would have been enough. I used the bus bars that I removed from a Nissan Leaf lithium pack that I bought... http://www.buggiesgonewild.com/elect...quisition.html The plastic covers and end terminals were salvaged from it as well. The bus bars are just copper bars with holes drilled to match the module spacings. You can use 2 guage cables to connect the pack to the cart. I chose the SB120s so I can remove/reinstall the pack quickly if needed. Every interconnection has quick-connect cables for this reason. You can connect the LVCO relay contacts to wherever you want to in order to disable the drive system. Bob |
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12-29-2018, 12:05 PM | #9 | |
Not Yet Wild
Join Date: Jul 2010
Posts: 46
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Re: EZGO 2Five Lithium Conversion Question
Quote:
Also, would this be a suitable relay given it only needs to be DPDT? https://www.ebay.com/itm/General-Pur...ty!93401!US!-1 |
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12-30-2018, 12:06 AM | #10 | |
Gone Insane
Join Date: Oct 2015
Location: TN/NC/GA Tri-state area
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Re: EZGO 2Five Lithium Conversion Question
Quote:
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