I have 46 LiFP cells 90Ahrs (TSs) in parallel with 12 off 50Ahr spiral wound
Chinese copies of yellow tops. I have no BMS on either set. They are charged
together with a contemporary NG3 Zivan charger that has user- adjustable
programs. Occasionally I check the balance manually with individual cell or
12V chargers after a full charge but the cells/batteries are always close to
full so the check interval is much longer now. This hybrid pack was
designed to allow high motor currents without exceeding the TS limit. I am
happy with this arrangement and have taken my EV on two long trips of 1600ks
& 1800ks respectively as testament to the success of the philosophy. I dont
take the pack volts below 120V which yields 2.6V/cell , above the lower
limit. Normally my pack volts are around 145V even after 100ks of driving.
When the lead bats wear out Ill probably get another set of LFPs as the
technology is improving. David
--------------------------------------------------
From: "hazemsedra" <[email protected]>
Sent: Tuesday, February 22, 2011 12:37 AM
To: <[email protected]>
Subject: [EVDL] combining Lead Batteries with Lithium
>
> A question to the forum:
> Any concerns combining a lead acid battery pack with a Lithium pack?
> I have 108v electric escort currrently equipped with 18 6v lead acid
> batteries.
> I would like to upgrade it to 144v by adding twelve 100aH Lithium Cells.
> Most likely I will need a separate charger for the Lithiums and an ethilon
> BMS
> to monitor them.
> The advantages are clear notably less money spent(buying only 12 Li cells)
> and it gives me
> a preliminary working experience with the Lithiums as to how to balance
> and
> monitor them.
> When the Li technology gets better, cheaper, and easier to monitor then I
> can invest in a
> whole pack.
> However what are the disadvantages and potential pitfalls?
> Thanks,
> Hazem
> --
> View this message in context:
> http://electric-vehicle-discussion-list.413529.n4.nabble.com/combining-Lead-Batteries-with-Lithium-tp3317351p3317351.html
> Sent from the Electric Vehicle Discussion List mailing list archive at
> Nabble.com.
>
> _______________________________________________
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_______________________________________________
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Chinese copies of yellow tops. I have no BMS on either set. They are charged
together with a contemporary NG3 Zivan charger that has user- adjustable
programs. Occasionally I check the balance manually with individual cell or
12V chargers after a full charge but the cells/batteries are always close to
full so the check interval is much longer now. This hybrid pack was
designed to allow high motor currents without exceeding the TS limit. I am
happy with this arrangement and have taken my EV on two long trips of 1600ks
& 1800ks respectively as testament to the success of the philosophy. I dont
take the pack volts below 120V which yields 2.6V/cell , above the lower
limit. Normally my pack volts are around 145V even after 100ks of driving.
When the lead bats wear out Ill probably get another set of LFPs as the
technology is improving. David
--------------------------------------------------
From: "hazemsedra" <[email protected]>
Sent: Tuesday, February 22, 2011 12:37 AM
To: <[email protected]>
Subject: [EVDL] combining Lead Batteries with Lithium
>
> A question to the forum:
> Any concerns combining a lead acid battery pack with a Lithium pack?
> I have 108v electric escort currrently equipped with 18 6v lead acid
> batteries.
> I would like to upgrade it to 144v by adding twelve 100aH Lithium Cells.
> Most likely I will need a separate charger for the Lithiums and an ethilon
> BMS
> to monitor them.
> The advantages are clear notably less money spent(buying only 12 Li cells)
> and it gives me
> a preliminary working experience with the Lithiums as to how to balance
> and
> monitor them.
> When the Li technology gets better, cheaper, and easier to monitor then I
> can invest in a
> whole pack.
> However what are the disadvantages and potential pitfalls?
> Thanks,
> Hazem
> --
> View this message in context:
> http://electric-vehicle-discussion-list.413529.n4.nabble.com/combining-Lead-Batteries-with-Lithium-tp3317351p3317351.html
> Sent from the Electric Vehicle Discussion List mailing list archive at
> Nabble.com.
>
> _______________________________________________
> | REPLYING: address your message to [email protected] only.
> | Multiple-address or CCed messages may be rejected.
> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
> | OTHER HELP: http://evdl.org/help/
> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
>
_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev