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  1. nosys70

    can u shrink a solar panel?

    you should respect people that are trying to read you by using proper grammar and spelling (and punctuation). especially if you are looking for an educated answer. The way you look on a forum is the way you write. no excuse since most computer and smartphones are equipped with tools that are...
  2. nosys70

    120ah 12V lifepo4 at $50!!! What's the catch?

    chinese ads are know to brush up products with good number even if they do not make sense. You can even read on the battery label they are 110Ah not 120. for example it could be a 12V battery with a max current discharge of 120Ah (but if the battery really is a 12Ah it means it will work only 6...
  3. nosys70

    can u shrink a solar panel?

    " alot of these aliexpress units are the same as the mpp units they just typo the shit outa the specs lol " well , it should not matter since about typos, you are looking like an expert...;)
  4. nosys70

    Mobile audio/video recording rig in a diesel pusher RV

    you can edit audio and video on a laptop so a small solar sytem should be ok. but if you want to power all what is shown on the picture, forget about it.
  5. nosys70

    What could Tesla be up to? Battery day announcement coming soon!

    these guys (like Elon Musk) are know to take an old concept, put a new name on it and call it an innovative breaktrough.
  6. nosys70

    Use the same negative cable for multiple seperate panels and controllers

    you would need a thicker cable for the one that is shared since you pass more current in it. it is a common mistake to think that only the "live" wire thickness is important.
  7. nosys70

    ANOTHER of wills videos gets taken down due to criticism...

    it all depends the wiring. some stuff are not working at all (got a 50Hz pump for swimming pool that was not working at 60Hz), but most devices are running, while they could show some isssues , like noise or excessive heat or loss of power. for example most fridges or freezer are working fine.
  8. nosys70

    Best scalable entry for DIY Solar for a home

    the best scalable system is the all-in-one MPPT. you can set a simple sytem, then stack them. ideally you want battery and panels for each system, so you also get redundancy. you can split load per system (totally separated) or merge all of them in one phase (you will need the communication...
  9. nosys70

    Good Battery Capacity Tester

    the easiest way to test a battery is to put it at work in real life. you hook it up to your inverter, install a load with a kill-o-watt meter and just check when the inverter cut. then you read the meter and get your answer. usually i use a halogen lamp with a variator and set the variator to...
  10. nosys70

    Question about dump load circuit.

    usually the dump word is used to express the fact you get some extra you want to evacuate without any form of control. so the best would be to switch the output of the wind generator directly to a a load (usually a heating element in a bucket full of water) if you pass trough the system...
  11. nosys70

    Which blueprint???

    you do not need solar if you are just looking for an UPS. you will need solar if the power outage duration is over several days. But even 2 or 3 days, it is still better to go with a gas generator. it will be cheaper and easier to use (you just need a a few gallons of gasoline). for heat, you...
  12. nosys70

    Water filter preference

    check https://watersafepro.com/models500-512.html you get a cheap filtration kit with UV (12 or 120V , i recommend 12V). unfortunately the filters are only 1 micro and 0.5 micron, so you should add a small 0.1 micron at the output so you are sure the water is perfect. you can find 0.1 micron...
  13. nosys70

    How Many Batteries for 400 watts of Solar Panels?

    400W on paper is more 280W in real life. so that is for 1 hour. multiply by 4 (pessimistic) and you get 280x4=about 1200W if you use a 12V battery, it is a 100Ah battery. You can take a 280Ah battery to get more off line coverage if it is designed as emergency system. But you won't be able to...
  14. nosys70

    small nuclear reactor is first to get US safety approval

    yes, but then the marketing guy comes in and decide that this technological marvel would be cheaper to produce in China, and after all if chinesium is weaker than steel, it is still cheap enough to be the material of choice. And refurbished reactor have bee proven to work fine even after being...
  15. nosys70

    280AH LiFePO4 too much in Small Package?

    probably Yes and No. these cells seems to be designed for low current discharge. but at 280Ah, even 0.5C is still 140Ah. and you can easily raise the total power by puttting a lot of elements in serie or parallel. So if your target is to discharge the cell a 1C or over, i would say it is...
  16. nosys70

    small nuclear reactor is first to get US safety approval

    the problem is harvesting energy in any form or method is destructive. should you cut trees, dig earth, cover desert with solar panels, you will change the nature the way it work. Since energy is a business, it usually care only on making money efficiently. this does not allow to take care of...
  17. nosys70

    small nuclear reactor is first to get US safety approval

    " the rods drop into the core and halt the reaction. " yes , magically... like all nuclear reactor that have blown up up to now. i do not know what you call an explosion, but when fukushima radioactive trace are reaching up to San Francisco... or when radioactivity form Techrnobyl reach Paris...
  18. nosys70

    small nuclear reactor is first to get US safety approval

    even the design is flawed. 1) "The design also uses a passive cooling system, so no pumps or moving parts are required to keep the reactor operating safely. " Great so no mechanical part that can fail. 2) " In the case of a problem, the reactor is similarly designed to manage its heat...
  19. nosys70

    small nuclear reactor is first to get US safety approval

    portable powerplant of all kind (included nuclear) exist since a long time. US Army installed some in Arctic in the 50-60's possibly it is still there.
  20. nosys70

    12 volt 24 volt 48 volt Peurket effect different

    usuually the mac C discharge rate should be published, since it is a rather important parameter a battery should be at least designed to resist 1C, but over, you better need to check for it.
  21. nosys70

    12 volt 24 volt 48 volt Peurket effect different

    i think peukert effect is rated for continuous discharge. if your battery is at rest some time and working only a few time at high power, the peukert effect is probably not so big. All depends you loads if they are continuous or not
  22. nosys70

    I have unlimited Tesla modules...could use help designing a RV system

    tesla pack need a lot of care to be operated properly. if you can use several of them to spread load , then you can care less, because you won't put them in extreme situation. but when they are in the car, the car is build around and bring a lot of safety (casing, cooling, management) that could...
  23. nosys70

    Just Place new Order on Alibaba- 280AH x 8 for 1260.00 USD Delivered, Grade A to Canada

    there is slang for KM this is "borne" , because on road you get a milestone (or a kilometerstone) every kilometer. so you say " il live 5 borne far from here" that is valid for french only, probably in german and UK english they have an other word.
  24. nosys70

    building a solar charger / powerstation for Ryobi One+ 18V batteries

    you can hack your 20V battery pack, by opening them and replacing the cell (usually 2000MAh cells) by LG 3500mAH cells. or you can 3d print and extension wall (between top and bottom of case) to add a 2nd pack of cell, doubling capacity. 20/40V pack are usually super expensive and if they are...
  25. nosys70

    Variable Frequency Drives (and more basic topics) explained

    it all depends the number of poles de motor has. cheap motors can have only 7-8 poles, while good ones can have over twenty. but YES, en ESC is just a PWM controller running on a 2 phases motor. Drones motors and ESC usually have 3 wires.
  26. nosys70

    building a solar charger / powerstation for Ryobi One+ 18V batteries

    a simple DC/DC converter able to deliver 21V should fit the need. it cost about 5$ on ebay. running other devices like a refrigerator or freezer at the same time, that is another story,, you would need a lot of panels or batteries since these devices are asking for a lot of power on a long...
  27. nosys70

    Amp draw within system?

    there are tons of other factors you need to check in real life. like a fast drained battery provide less power than a slow drained battery.. like a FLA (lead acid) battery should not be drained under 30%, and LFP at best 10% like cabling could be a parameter, like temperature
  28. nosys70

    connect battery to the MPPT input of a grid-tie inverter

    the problem is usually battery voltage is a lot lower than solar panel input, so for the same power, you would dramatically increase current. the good method would be to mimic solar panels using a DC/DC converter. So if your battery is 24V, you can probably increase to 36 or 48V. Additionally...
  29. nosys70

    Recovering LiFePO4 cell

    i think if you can get 278Ah out of the cell, it is not dead, since it is a 280Ah cell. It is just the discharge curve is not aligned with other cells. The impact on the lifetime still have to be demonstrated. That is probably why we got these cells for so cheap. they are probably rejected at...
  30. nosys70

    Extending battery life by periodically limiting SOC

    possibly an idea would be to add a cell in serie (possible only if you have a multi-cell battery pack.) so instead having 8 cell for 24 volts, you would get 9. so the charger would work 1/8 lower (12%) then instead working in 20-90% range with same settings you are working in 8-78% range. for a...
  31. nosys70

    Infinite Battery?

    with investor you should not use revolutionary, it sounds too communist. use "Innovation", " massive breakthrough ", "shifting paradigm" , "next level up", " leadership development ", " disruptive " feel free to mix.
  32. nosys70

    Solar heating hottub (assisting heating)

    yes they are evacuated tubes. basically is it a glasse tube with double wall, like a thermos bottle. inside the tube there is a metallic plate to capture heat and a copper tube that goes along the tube to a "bulb" at the top of tube. the copper tube and the bulb are filled with a very volatil...
  33. nosys70

    Off grid stereo..?

    the best is to get several bluetooth loudspeaker. They are designed to output loud sound with minimal energy. they can work for hours on a single charge. You can daisy chain several of them depending brand and model. i use JBL Xtreme 2 , you can daisychain up to 100 devices together...
  34. nosys70

    Infinite Battery?

    betavoltaic produce also heat, so in deep space it could be useful for keeping circuits warm. betavoltaic is nice because in theory the generator is set to fixed power by design, so you do not need any type of regulation, or moving parts. supposedly it just look like an inifinite battery.
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