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  1. MisterSandals

    Newbie Question about SOC vs Voltage

    That seems reasonable. How high are you charging them? Here is a widely accepted voltage vs SoC chart:
  2. MisterSandals

    Daly BMS Will Not Balance

    The remedy is you charge as close to 3.45Vpc before they diverge. You are not alone on this by any means. 54V = 3.375Vpc Mine settle to 3.35Vpc and i consider that 100% charged. Set your charge to the voltage BEFORE they diverge and give it a go for a week.
  3. MisterSandals

    AC200MAX + Renogy 100watt Flex panels...HOW MANY?

    Maximum Power Voltage(Vmp): 20.4V Maximum Power Current(Imp): 9.80A Open Circuit Voltage(Voc): 24.3V Short Circuit Current(Isc): 10.2A 4 of these is series would be about 82Voc which works well staying under 145V. MC4 connectors are pretty much the standard. I see in the comments that they...
  4. MisterSandals

    How to determine what amperage bus bar to buy

    Your 2 inverters, at 6000W total would require: 6000W / 51.2V = 117A Putting smoothJoey's refinements: 6000 / .85 / 48 = 147A (service amps) 147A / .8 fuse headroom = 184A fault amps (or AC inverter only) Add in what you intend to be running directly from battery and that is your rated amps...
  5. MisterSandals

    Comparing “old” 160w panel to “new” 250w panel and other considerations upgrading to LiFePO4

    I think GEL would be preferable because there is no equalization stage. Otherwise they are nearly all identical. Yea, exceeding the 23V with a panel Voc would be bad. I have a 100/30 and its a REALLY nice SCC. It would take a couple clicks but when you switch batteries to change profiles, it...
  6. MisterSandals

    Multiple MPPT's and Connection to Battery Bank

    Both of those options are completely unbalanced and will result in very unbalanced batteries. This is the simplest for me to visualize:
  7. MisterSandals

    Multiple MPPT's and Connection to Battery Bank

    How do you have these wired? Maybe that's a problem. There are 4 positive battery terminals. Do you mean battery bank terminal? This whole paragraph is REALLY confusing. In general, its fine to have multiple charges charging a battery bank. You probably already have 2 chargers, your SCC...
  8. MisterSandals

    Inverter / Charger

    I too am not a Renogy fan but if you already have this, my impression is that its OK as an alternator/DC-DC charger but falls down horribly when combined with or used exclusively with solar. What will your array be in parallel with? Or are you talking about panels in parallel (which sounds...
  9. MisterSandals

    SmartSolar 150/45tr

    This is a curious statement. So you're not getting ANY charge into your battery(s) from your solar? Happen to have a screenshot of the app along with the settings?
  10. MisterSandals

    How to determine what amperage bus bar to buy

    How many watts/amps are these rated for? Are there other DC loads that will be running? Your bus bar will probably be around 2.5x what each inverter is rated for.
  11. MisterSandals

    AC200MAX + Renogy 100watt Flex panels...HOW MANY?

    Have you looked at big cheap panels on craigslist (or other local venue) in your area? There is not a lot of differentiation in solar panels as far as i am concerned. I like big cheap ones. As big as fits the situation - for you that sounds like what will fit in your trailer and can be...
  12. MisterSandals

    Daly BMS Will Not Balance

    So hanging is settled voltage? I have no idea where you are here. We talked about 3.45Vpc (55.2V). Then you mentioned that your cells diverged: This means that the charge voltage needs to be dialed back a little to just before the cells diverge.
  13. MisterSandals

    How to determine what amperage bus bar to buy

    You know the amps coming out by counting the amps used in your loads. What are you powering from your batteries? An inverter is usually the biggest draw but you also need to figure in all the other concurrent loads. That and some buffer will be your bus bar size requirement.
  14. MisterSandals

    Daly BMS Will Not Balance

    Sorry, I reread your post about 53.4V and did not know if that was your charge or float number.
  15. MisterSandals

    Daly BMS Will Not Balance

    EDIT: so this is after charging to 55.2V? You are mentioning numbers and i cannot tell which are your charging numbers and your settle numbers. You need to find the charging numbers first that are just below where the cells diverge.
  16. MisterSandals

    About to spend a lot of money tomorrow on this system (am I making a mistake?)

    Yea, not what he said, but rereading it with the rose glasses you provided, i am with you. Thanks!
  17. MisterSandals

    About to spend a lot of money tomorrow on this system (am I making a mistake?)

    This sounds like you are not understanding what MPPTs do. You want to setup your array into strings that fit your Victron 450/200, so roughly 400V and not 400A. I'd get this worked out before ordering to make sure your panels work with your SCCs. Have you done the wire size calculations for...
  18. MisterSandals

    Using vehicle 110v outlet

    Depends on what the outlet is rated for and how big of a charger you plan on getting. Otherwise its an easy solution. There is a 70A fused DC power source in the base of the pillar behind the passenger door. I've tapped into that to power a Victron Orion DC-DC charger to a lithium battery...
  19. MisterSandals

    SOK 24 VDC 100 Ah Batteries

    I think you'd be able to adapt to a 4000W inverter by making just a little effort to not run the microwave, brew coffee and heat hot water at the same time. I would think I would give the fridge a go on DC. And, make an effort to heat hot water when you have plenty of sunshine and batteries...
  20. MisterSandals

    Daly BMS Will Not Balance

    You should base the float on where YOUR cells settle, not mine.
  21. MisterSandals

    Question 3S 2P and pictures of crates

    100W x 6 = 600W (at 100% efficiency) 600W / 12.8V battery = 46.9A 135Ah / 46.9A = 2.9h of quality sun ========== Or considering you got 5h of quality sun 135Ah / 5h = 27A charging (57% of maximum under ideal conditions) ========= 600W x .57 efficiency = 342W (still assuming this is spread...
  22. MisterSandals

    SOK 24 VDC 100 Ah Batteries

    Have you added up the wattage of all of these running at the same time? 1000W coffee 1500W small microwave 250W TV 250W fridge ==== 3000W (insert your better number here) So hopefully your water heater is less than 1000W.
  23. MisterSandals

    Question 3S 2P and pictures of crates

    I'd first look at the MPPT range of any SCC as that is the sweet spot for input voltage. It used to be folks recommended about 80% of max input voltage but now i think the consensus is that closer to battery voltage is better (but well within the MPPT range). Putting 3 strings in parallel will...
  24. MisterSandals

    Daly BMS Will Not Balance

    Thanks for the succinct question! There are dozens of threads follow. This thread was unfortunately started by someone else so i cannot just go back to the first post to see your equipment and issues... it somewhere in the 4 pages (70 posts) that i don't want to reread completely too many...
  25. MisterSandals

    Daly BMS Will Not Balance

    What charger? What voltage did it stop at? 3.3375V per cell. Certainly low for LiFePO4. 70% probably not far off for a BMS app. Sorry i cannot find your charger. There are so many different people jumping in this poor thread, its impossible to find a single line of thought.
  26. MisterSandals

    Solar system stopped charging

    We have no idea what your actual power usage/needs are which is why an energy audit is always recommended (even as late as post #9 in a thread). There are links to a couple in my signature. You will learn more about your solar in this step than any other step.
  27. MisterSandals

    Daly BMS Will Not Balance

    Because you discharged it for 9hrs. I couldn't find that looking on a tiny screen. 310Ah x 51.2V = 15,872Wh So your discharge to 13% but recovered to 40% on its own, lets go with 60% discharge and run some numbers. 15,872Wh x .6 = 9523Wh discharged. 31Ah x 51.2V x 9h = 14,284Wh (using...
  28. MisterSandals

    Daly BMS Will Not Balance

    Its not uncommon for a battery voltage to bounce back after a hard discharge. 31A x 48V x 9h = 13,392Wh 12.4A @ 120V x 9 = 13,392Wh Ok, good. -------------- Your battery is 100Ah @ 51.2V right? 100Ah x 51.2V = 5120Wh how do you get 3x this from your test? ------------- 285Ah at what...
  29. MisterSandals

    RV with solar and DC-DC charger

    Why do you suspect only the solar is charging? What does the Orion show in the app? Can you post a screen shot along with what your LV2424 is showing? In general, chargers charge when they need to. So if your solar is applying a 28V charge voltage, your Orion might see this voltage (and it...
  30. MisterSandals

    Solar system stopped charging

    A 100W panel flat on the roof of a car will not produce much. Even at 100W and 5h per day (these are summer numbers!), that is 500Wh. Your battery is 100Ah x 12.8V = 1280Wh. So it would take almost 3 days at optimal conditions to fully charge your battery (from battery over discharge...
  31. MisterSandals

    Comparing “old” 160w panel to “new” 250w panel and other considerations upgrading to LiFePO4

    What are the details of your AGM profile? I've seen people here recommend AGM when an LiFePO4 is not available. I use a standard lead acid profile in my RV when connected to shore power but that's not often. Seems just fine. AGM should give a full charge.
  32. MisterSandals

    Kit ?

    What kits are you looking at? Have a link? 6kWh / 30 days is 200Wh per day this is the equivalent of a 100W bulb on for 2 hours. A refrig would take several times more than this alone. What are you hoping to power?
  33. MisterSandals

    1200 watt wind turbine. not charging battery bank. help please

    Sorry i do not have experience with what you are doing or what is wrong. Maybe check or post here: https://diysolarforum.com/forums/wind-turbines.46/
  34. MisterSandals

    Lifepo4 Top balance problem and Voltage Problem

    Looks like a balancer. He has been mighty resistive to accepting that he needs a BMS.
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