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 > Your search for posts made by 'full_mosey' found 17 matches.

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RE: Samlex Inverter Power Draw Question

EMD360 what brand of lfp batteries are you using? Don't they have low temp protection, ... Splitting hairs here. You have manufactured LiFe 'batteries'. LiFe cells do not have temp protection. You have an assembled battery of LiFes where the inclusion of a BMS can do the protecting. HTH; John Future LiFe DIYer What are you talking about??? If you're going to split hairs how about your abbreviation for LiFePO4 or the commonly used abbreviation LFP so not to confuse new comers to the meaning of "life". ;) I am talking about the difference between a cell and a battery. Also, you don't seem to object to our friend KJINTF when he calls them LIFE. HTH; John
full_mosey 07/11/21 05:14am Tech Issues
RE: Samlex Inverter Power Draw Question

EMD360 what brand of lfp batteries are you using? Don't they have low temp protection, ... Splitting hairs here. You have manufactured LiFe 'batteries'. LiFe cells do not have temp protection. You have an assembled battery of LiFes where the inclusion of a BMS can do the protecting. HTH; John Future LiFe DIYer
full_mosey 07/10/21 11:29am Tech Issues
RE: Samlex Inverter Power Draw Question

if your shopping for a new microwave for the RV get a panasonic true inverter microwave. doesn't cycle between 0 and 100%, but stays at a fixed % you set and at 50% power will do most of what you want but draw about 1/2 the full power current, Works great with an inverter setup. Doesn't take twice as long at 50%, maybe 25% longer They also work well with an inverter generator as the constant draw keeps the genny running at a steady rate. No more alternating and irritating sound of full-speed then idle. HTH; John
full_mosey 07/10/21 11:01am Tech Issues
RE: LiFePo4 vs Lead Acid...Some points of interest.

Always suspecting the sales hype, so want to verify the claims and see if possible where they got their numbers. In this case it is true that 1C with LFP is 4 x faster than with FLA doing depleted to full. ... The premise is wrong because you have added 'full' as a constraint. Perhaps you have not fully grasped a point I made in my recent post. To wit, "1. the practically unlimited cycles without any full charges,". There is no penalty for partially charging an LFP. All I need to do during a recharge is ensure that the LFP will have enough capacity to last until the time I plan the next charge. There is no 'full' goal. I could revise the former test as: Cycle the LFP at 10% - 50% and the FLA at 10% - 50%. Do this until the FLA dies. What do you believe would happen to the FLA if it were reharged at 10% - 50%. Quick death? Now, try working your calculations again with valid criteria. HTH; John
full_mosey 04/08/21 10:33am Tech Issues
RE: Battery observations of winter storage.

I winterized the MH in late Oct, pushed battery disconnect to store for house batteries and disconnected the neg cable on my chassis battery. Checked house batteries in Feb and they lost 20% SOC. Checked again today and they were only down 10%. Of course in Feb it was in the 20's and today we are up in the 60's. The batteries are still at 90% SOC after 5 plus months sitting with no charge on them. Each year I think this is it the batteries won't make it through the winter because the batteries are 14 years old but it looks like they will make it another year. I really like the 2 6v GC batteries from Sam's Club, I think back in 2007 they were made by Duracell. What kind of meter do you have that knows SOC based on temperature? HTH; John
full_mosey 04/07/21 02:17pm Tech Issues
RE: Battery observations of winter storage.

Duracell is a re-brand. Perhaps John Controls? A helping hand for warm weather use and storage is to adjust electrolyte density to 1.260 This must be done when the battery is brand new. It should be top charged and rested for a day. This can easily add 30 - 50% added lifespan. In the Sams Clubs I have seen that the Duracells are Deka-East Penn and the Energizers are Johnson Controls. HTH; John
full_mosey 04/07/21 02:13pm Tech Issues
RE: LiFePo4 vs Lead Acid...Some points of interest.

LFP is faster in all conditions. Not even close enough that you would need to time it. There is no "fair fight" as LFP is whole different class. Here is a 'fair' fight. Cycle the LFP at 10% - 90% and the FLA at 50% - 90%. Do this until the FLA dies. Install the LFP as a replacement for the dead FLA and continue on your merry way. The LFP features I am looking forward to: 1. the practically unlimited cycles without any full charges, 2. replacing 400lbs of AGM with 100lbs of LFP. HTH; John
full_mosey 04/07/21 02:04pm Tech Issues
RE: Daly BMS gone crazy..Update Opinions

... We are offering all customers that have a failing Bluetooth 2 choices: (1) Total Refund. (2) $50 rebate by PayPal. ... If they mean Total Refund then take it. If they want your unit sent back, they should send you a prepaid return container at no cost to you. Do you still want a drop-in? The question is, what do you know now that would make you better able to choose another drop-in? HTH; John
full_mosey 03/30/21 01:51pm Tech Issues
RE: Daly BMS gone crazy..Update Opinions

"I bought this particular battery was the smart Bluetooth and the cold cut off,so we'll see how it plays out..." ============================================ Those are reasons to choose a particular BMS, not a LFP battery. I am doing a DIY. I chose LFP because I am retiring a 12yo 155AH 100lb AGM. I will soon have a 280Ah 50lb battery that is nearly twice the energy at half the weight. It will cost less than the 100AH drop-ins. Go ahead and continue to get your LFP education by reading drop-in documentation, and you will continue to be confused. HTH; John
full_mosey 03/29/21 08:58pm Tech Issues
RE: Lithium batteries and new solar charger

Still no answer :( So if 10v is true zero and is 100AH down for the BB 100AH battery like it says, then people are fooling themselves thinking it is really a 120AH batt so they are not really going that low all the way to zero. We can't know what is true unless we know the individual cell's specs. I can only imagine where you got the idea about 'true' zero. With the drop-in packs, all you will be able to observe is the range of Voltage and rates of charge and discharge that are controlled by the BMS. The BMS is set up to enforce certain Volt, Amp, and Temperature limits inherent to the chemistry of the cells inside. What you are getting is a long warranty at a price. The drop-in's BMS will do its best to prevent you from using that warranty by denying you access to those cells. HTH; John
full_mosey 03/26/21 09:13am Tech Issues
RE: Daly BMS gone crazy..Update Opinions

No, but I remember full-mosey had a scheme worked out that was over my head for doing that with his set-up, posting lots of graphs about it. I still do graphs. I now use a simpler method to calculate ABS time for the AGM bank. Each night, I use the time in BULK from the 10 prior days. ABS time for the following day increases or decreases in a direct relation with BULK time. So simple and self correcting. I won't need that any more when I switch to LFP. HTH; John
full_mosey 03/24/21 09:05pm Tech Issues
RE: Daly BMS gone crazy..Update Opinions

The lithium BMS that report SOC use coulomb counting, just like the Victron BMV. Even the cheap BlueTooth BMS from China have built in coulomb. Seeing they are usually measuring current anyway, it is a few extra lines of code to calculate SOC. I will check that out.
full_mosey 03/24/21 08:53pm Tech Issues
RE: Lithium batteries and new solar charger

.... But resting full is 13.6v so 100 x 13.6 =1360 watt hrs so it is confusing? Whatever, Battle Born claims the 100AH batt has "2 to 3 times the power of the same size lead acid" batt. "Power" meaning watts? Watt hrs? meanwhile a 100 AH 12v FLA has a resting voltage of 12.73 when full so that is 1273 watt hrs. Beats me how 1360 is 2 to 3 times 1273. I am told this would all make sense if only I owned LFPs myself, but do you need some kind of New Math too? :) Easy, Watt-hours are energy, not power. Which one can produce all of its energy, 100Ah, in the shortest time? Put another way, LFP has the same size fuel tank but more horsepower and can work faster. If the FLA is pushed to work faster than 5A, less work gets done. The LFP doesn't care because there is virtually no sliding scale of work produced based on how slow or fast it gets done. HTH; John
full_mosey 03/24/21 07:56pm Tech Issues
RE: Daly BMS gone crazy..Update Opinions

I was asking about how the Smart BMS can monitor SOC when it has loaded voltages to work with. I know know it is not a charger :) My question may still be relevant. Do you have a, or know of any, device that can know how to consider ongoing loads so as to know to automatically adjust charging time or Amps to compensate for loads for any type of battery chemistry? I don't believe a BMS does this. I can assure you that the BMS that I have chosen for my DIY LiFePo cells does not. HTH; John
full_mosey 03/24/21 05:17pm Tech Issues
RE: Daly BMS gone crazy..Update Opinions

What can get confusing with lfp is dropin or diy cells/ battery. Then within that arena are the bms's that can get set by and not altered in dropins or bms's that can get set by the diy. Then there is the 'full' capacity amount. Mine is set to 14.1v. Capacity Algorithm:The EMS CPU keeps track of the capacity of the battery pack by tracking current in and out of the battery (coulomb counting). There are however several corrections built in to the software to ensure that the capacity stays accurate over time. The capacity will reset to 100% if the following conditions are met: - Total pack voltage measures 3.52V x N (N being the number of cells) when being charged by a battery charger. I could set the voltage higher (14.2-14.6v) but for me 14.1v or 14.2v works perfectly for my needs and keeps the cells fairly equal to each other. Dropins seem to require a higher voltage of 14.4v +/- the get the capacity reset and balancing the cells. The difference from full charge from 14-14.6v is very minimal but at the high voltage if you have any runner cells they get pushed in to the upper knee with little return and possibly shortening the life. Which then leads to the next dilemma or debate are your batteries for full convenience of day to day use or you want the "longgggg" life with many cycles of lfp. Decisions, Decisions For the drop-ins, IMHO, the lowly WFCO converter that only does 13.6V charging could be perfect for daily charging. There is very little capacity gain by charging past 13.6(3.4V/cell) to offset a potential loss of cycles. There is no penalty for not reaching 'full' charge for long periods. All you actually need is enough charge to carry between charges. A Harbor Freight 2/10/50A could be adequate for an initial charge and an annual refresh. HTH; John P.S. I am working on a DIY 12.8V pack beginning with four 280Ah cells.
full_mosey 03/24/21 05:04pm Tech Issues
RE: Daly BMS gone crazy..Update Opinions

With the BMS reading cell voltage and getting the SOC from that, how can it tell when the cell voltage is a lower loaded voltage and the SOC is actually higher? The AH counter doesn't get fooled by that. The BMS is not a battery charger. Do you have a battery charger that knows the SOC of your batteries? HTH; John
full_mosey 03/24/21 01:46pm Tech Issues
RE: Lithium batteries and new solar charger

.... Voltage drop matters greatly with MPPT though. You benefit from the 24v needing thinner wire than 12v, but adding panels will increase the amps and it could be a wash so you could need fatter wire anyway. Two LFPs will have fewer usable AH than four 6s, but with the solar you will only notice when there is an overcast for a couple of days so you need your battery bank as a "reserve" until the sun comes back out. It "depends" whether your two LFPs will be enough reserve, but it also "depends" whether the four 6s would be enough, so there is no way to be sure. You have to figure the odds on that. Obviously the odds are better in CA than in WA, eg. 1. With MPPT, you manage losses due to Voltage drop by increasing the solar output voltage by wiring panels in series. This is no 'big deal'. Even if you keep all the panels in parallel, the MPPT can outproduce PWM. In contrast, PWM cannot outproduce MPPT. 2. I have purchased 4 x 280Ah, 3.2V LiFePo cells to create a nominal 12.8V battery. If I were to use 8 cells I could have 2 12V batteries equaling 580Ahs. Wouldn't that be more Ahs that 4 x GC2's at 440Ahs? HTH; John
full_mosey 03/24/21 01:02pm Tech Issues
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