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Re: Reviving lead batteries, buying new ones, Need Help getting 1980 Commuta going
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? ? ? ? ? ? ? ? ?Hi Roy and all, ? ? ? ? ? ? ? ? ? ? ? ?Lead batteries should be charged to 2.5vdc/cell and after charging, sitting for a while settle to 2.2vdc/cell. ? ? ? ? ? ? ? ? ? ? ? Older long discharged batteries should be taken to 2.5vdc/ cell for an hour, discharged to 2vdc/cell and recharged to 2.5vdc/cell and cycled 2 more times to wake them back up. 100% discharged is about 1.8vdc/cell ? ? ? ? ? ? ? ? ? ? ? These will boil and they need to in order to equalize. ? ? ? ? ? ? ? ? ? ? ? ?Then set them to 2.3vdc/cell for a day or 2. ? ? ? ? ? ? ? ? ? ? ? ? Then separate them and test them for voltage after letting them set, then for amps.? Write down each and if not close, charge, cycle again whichever one/s are over 10% lower and see if they come back. ? ? ? ? ? ? ? ? ? ? ? ?As a 48vdc pack should charge to 60vdc, an equalizing charge and about 54vdc regular charging and equalize once every 5 charges. ? ? ? ? ? ? ? ? ? ? ? Another way is charge in series to 60vdc and check voltages and charge up any low ones to 2.5vdc/cell.? ?Discharge the string and recharge, repeating charging the low ones until after a day they are all 2.2vdc/cell.? Then cycle them a few times and they'll be as good as they will be. ? ? ? ? ? ? ? ? ? ? After sitting a while they stabilize so need to be woken up. ? ? ? ? ? ? ? ? ? ? ?Use the EV or a oven element in water, hotplate, other load and remember don't turn on or off any AC switch? as they won't survive DC switching, especially turning them off. disconnect at the battery.? For 8vdc batteries a 12vdc headlight using both elements works good though only 8 amps or so. ? ? ? ? ? ? ? ? ? ? ? It's some work but will pay off by staying equal while driving if they are still good.?? ? ? ? ? ? ? ? ? ? ? ? If you have to buy a new set think about buying used LG cell lithium like Volt EV? modules as barely more expensive now and a lot lighter and they don't need a BMS. ? ? ? ? ? ? ? ? ? ? ? Or 6vdc as last longer than 8vdc and cost less. 8vdc batteries really are not up to the heavy use a Ccar has.? It'll work but not as well or long. ? ? ? ? ? ? ? ? ? ? ?Remember these are marked up 60% of list so lots of bargaining room.? ?My favorite is East Penn/Deka as best quality for the price. ? ? ? ? ? ? ? ? ? ? ? ?Recycling them you can get about $18 each so check recyclers for price vs what the battery shop will give you. ? ? ? ? ? ? ? ? ? ? ? ? If buying new insist on getting them? from the same pallet/batch with matching batch numbers so they equalize better, will live longer, give no trouble.? ? ? ? ? ? ? ? ? ? ? ? ? This is straight from the person that designed most Trojan and USBattery brands that schooled me? and my 40 yrs lead experience, 27 in EVs.? Though now I run Volt lithium for 2.5 yrs now without a BMS as most do without a problem and since I buy in bulk to sell, cheaper.. ? ? ? ? ? ? ? ? ? ? ? ? ?Jerry Dycus
On Monday, August 3, 2020, 07:45:12 AM PDT, Dave Brice <dbrice3721@...> wrote:
I'm sure we can help you Roy. To begin,? a fully charged 8v battery should be closer to 8.5v each with a total 48v pack fully charged around 51v. At 7.5v, those batteries are very low. I'd try hooking them all up together and letting the delta do its work. It will likely take a few charges to start balancing them so keep an eye on the water level. Do you know if your car still uses the contractors or has been updated to a modern controller? On Mon, Aug 3, 2020, 9:59 AM Roy Egan via <lowbid2001=[email protected]> wrote: Have 1980...got six batteries..8v got charged to 7.5v+ ea |
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