flooded 8D is 160 pounds. 200 aH Lifepo is 40. On Thu, Jul 28, 2022 at 6:26 PM Joe Della Barba via CnC-List < cnc-list@cnc-list.com> wrote:
> 1 AH means you get one amp for one hour. > > Power is amps times volts, so 1 amp at 12 volts is half as much power as 1 > amp at 24 volts. > > Amp-hours only makes sense when comparing batteries of the same voltage, > watt-hours is the same across all voltages. > > > > A 225 AH 12 volt lead acid battery an 8D size and is very heavy. It can > supply about 120 amp-hours or so for long life in cycling mode. A 200 > amp-hour lithium battery is good for maybe 180 amp-hours without damage. > Rule of thumb is lead-acid should cycle at 50% and lithium can go to 80%. > > > > > > Joe Della Barba > > Coquina C&C 35 MK I > > Kent Island MD USA > > > > > > > > *From:* Bill Coleman via CnC-List <cnc-list@cnc-list.com> > *Sent:* Thursday, July 28, 2022 3:35 PM > *To:* Stus-List <cnc-list@cnc-list.com> > *Cc:* Bill Coleman <colt...@gmail.com> > *Subject:* Stus-List Re: [EXTERNAL] Re: Lithium Batteries > > > > Oh! > For some reason, I thought Ah were constant, regardless of voltage - I > guess maybe that is Kilowatts - > So with a 200 Ah Lifepo battery vs a 255 AGM, looks like I will lose some > capacity, unless that is made up with efficiency from the Lithium - . > > Does that make sense? > > > > Thanks Joe. > > Bill Coleman > > > > On Wed, Jul 27, 2022 at 2:40 PM Della Barba, Joe via CnC-List < > cnc-list@cnc-list.com> wrote: > > A 100 AH 24 volt battery and a 200 AH 12 volt battery hold the same amount > of power. > > Assuming they are using 100 AH cells, the 12 volt will have 2 sets of 4 > in series in the case that are then in parallel and the 24 volt version > will have all 8 in series. You could literally open the case and change a > 12 to a 24 volt or back again, BMS issues aside. > > Don’t forget the lithium batteries in a standard-size case may not be > using all the real estate inside that case either, it isn’t like lead-acid > where a certain capacity means a certain size. > > > > *Joe Della Barba* > > Coquina > > > > > > *From:* Bill Coleman via CnC-List <cnc-list@cnc-list.com> > *Sent:* Wednesday, July 27, 2022 2:33 PM > *To:* Stus-List <cnc-list@cnc-list.com> > *Cc:* Bill Coleman <colt...@gmail.com> > *Subject:* [EXTERNAL] Stus-List Re: Lithium Batteries > > > > These are confusing, they have a 24 V that looks similar in size to the > lifeline 8D, but the 8D is 255 Ah, and the > *SOK 24V 100Ah LiFePO4 Battery > <https://www.us.sokbattery.com/product-page/sok-24v-100ah-lifepo4-battery>* > > > > is only 100 Ah - are they supposed to be equal, even with that disparity? > > > > Blil Coleman > > Entrada Erie PA > > > > On Tue, Jul 26, 2022 at 4:45 PM Joe Della Barba via CnC-List < > cnc-list@cnc-list.com> wrote: > > I think I am going to get 2 of these: > > https://www.us.sokbattery.com/product-page/sok-12v100ah-lifepo4-battery > > > > Advantages I see: > > 1. Two of them means a dead BMS only takes half the bank offline, not > 100% of your power. > 2. They have heaters for the very rare times the cabin might be below > freezing. > 3. They have Bluetooth for access to the BMS. > 4. I saved the best for last, if the BMS craps out or you just want a > better one, just open it up and replace it! This is NOT possible with most > batteries unless you cut them apart. > 5. See 4, a dead cell can be replaced. > > > > Joe Della Barba > > Coquina C&C 35 MK I > > Kent Island MD USA > > > > > > -- Joel
