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  1. S

    Battery tester is so smart I can't understand how it works...

    I bought a battery tester, typically for car use. 2 x croc clips. If you don't connect both leads well enough it tells you.... but it even tells you which colour isn't mated properly. How the hell can it know which one is dodgy? Explanations welcome!
  2. S

    Live Ground Shocked 5 Year Old

    Turn it off & go back to the design phase & post your proposed design here for feedback. Don't try to resolve the current setup until you know what safe looks like. There's some horrible advice here and you could be one fault/action away from a lethal situation.
  3. S

    Heater element matched to solar panel output = diode string

    Increasing the inverter size to cope with extra heating (which is probably the biggest load) has several disadvantages 1. You might not be allowed to connect the larger inverter to the grid 2. Having a larger inverter used with a smaller load means you're operating in a very inefficient region...
  4. S

    Heater element matched to solar panel output = diode string

    @Steve T - IoW UK @upnorthandpersonal Have you built your yet? Any lessons learned or feedback? Do either of you have PCBs available and ideally, links for components?
  5. S

    Heater element matched to solar panel output = diode string

    https://www.bel-shop.eu/controller-for-boiler-suplying-from-solar-panels-mr4316ac-ng-to-switchboard/ This is a commercially available alternative to Loadmaster allowing use of standard immersions inc mechanical thermostats. Not seemingly as elegant but available off the shelf or as a kit. It...
  6. S

    Heater element matched to solar panel output = diode string

    Good thinking...But how do you switch DC without killing the switchgear due to arcing?
  7. S

    Have any of you all looked into building a Tesla magnetic Wheel?

    You seemingly believe all this tosh. If you start posting relevant stuff I'll help. Any more nonsense & I'll report you & encourage others to do so. This is your opportunity to listen and learn... you won't 'convert' anyone here, they are too well grounded. 200 ohms or less typically.
  8. S

    the rapidly changing inverter landscape

    I always agreed with that until I have to hang a Victron Quattro 15kVA on the wall in a 5ft high shed with no room for a second person. It took me an hour to recover. I guess I specified wrong shed, not wrong inverter though!
  9. S

    How much can 4x 100a BMS draw in series?

    1. You can't put 12V batteries in series unless the manufacturer specifically states you can 2. Drawing 70A continuous from a 100Ah battery is pushing things. Expect issues , unless it's very intermittently used 3. Go 48V from the ground up
  10. S

    Have any of you all looked into building a Tesla magnetic Wheel?

    You're seeming very knowledgeable. Could you tell us about 5G cancer, Vaccines, Chemtrails & JFK? Don't make it too depressing though - I might go & jump off the edge of the earth.
  11. S

    Underfloor heating.... outside!

    Just daytime heat typically, but I *could* use some spare battery energy I guess.
  12. S

    Underfloor heating.... outside!

    I sometimes look at threads & wonder how many more times someone has to be told something before it sinks in! This time I'm the recipient! But I'm slightly defiant, because as you say, physics will determine it. So here are some sums to help me better visualize it & for people to steer me. BTW...
  13. S

    Underfloor heating.... outside!

    Thanks for your feedback. I believe there's a difference though... the air has almost zero specific heat capacity, or thermal mass. I do want cheap - I can't get a digger in there. It's 5m x 5m approx, stony ground, so digging that out will be a nightmare, and costly.
  14. S

    Have any of you all looked into building a Tesla magnetic Wheel?

    This post has really got me thinking. I might sell my EV & make one of these. Edit, but I don't like the shape of that cab, let alone the smug grin of the driver...
  15. S

    Underfloor heating.... outside!

    Efficiency doesn't matter in my case - not at all. IT'll only ever get utilised on sunny days when there's nothing else I can do with the power
  16. S

    Underfloor heating.... outside!

    My gut reaction is that the downward heat loss won't be huge and that it'll also have some benefit for subsequent days. Gut reaction though, and my gut sometimes gets things badly wrong!
  17. S

    Underfloor heating.... outside!

    I appreciate I can get a higher temperature if I insulate between slab & earth, but I'm not too worried about the heat loss into the ground. As long as it doesn't rain that heat's not really going away in a hurry. The main reason though is that I don't want to dig any deeper than necessary, nor...
  18. S

    Underfloor heating.... outside!

    ignore this - can't delete
  19. S

    Underfloor heating.... outside!

    I suppose I might heat from batteries but typically not. It's all about storing daytime excess power through the evening, with minimal cost
  20. S

    Underfloor heating.... outside!

    The theory in not insulating was to maximise the thermal mass. I don't care about how much is lost downwards if it gives me a larger lump of heat
  21. S

    DC water heater.

    Quote below explains the inductor is for suppression The Inductor and C2 provide filtering to limit dI/dt and dV/dt on the external cables. D1 is used to catch the back emf spike and energy released by the inductor when the MOSFET switches off. Whilst this arrangement may look like a low side...
  22. S

    Underfloor heating.... outside!

    Hi, I'll have 30kW of PV fairly soon, with restricted permission to export, so excess power. Once the batteries are full & the car is charged & the hot water tank is hot, I'm considering heating water to pump in an underfloor area outdoors - goal is to have warm feet in the evenings. In the UK...
  23. S

    Has anyone's battery failed due to overcompression?

    Interesting that they use ABB robots though
  24. S

    DC water heater.

    The project is here. https://projecthub.arduino.cc/stevetearle/loadmaster-xp-a-smart-pv-mppt-solar-hot-water-controller-5264c7 It's very well explained. I've not analysed in depth but it seems well designed & implemented, with sound theory behind it.
  25. S

    DC water heater.

    You can use PWM DC into an immersion heater/s. I'll dig out the approach
  26. S

    My adventures building a DIY Zn/I flow battery

    Not seen it, but I'll wager that he doesn't mention whether it's remotely viable. He (quite skillfully) avoids letting users know if his suggestions are remotely viable. I'm sure he's fully conversant with kW, kWh etc but I've yet to hear it across any of his projects. His unit of power is "wow...
  27. S

    PV array isolation

    There is no power, just potential for it
  28. S

    Good and cheap IR scope?

    Flir One Pro - very pleased. Ther themal & visible overlay has a parallax offset issue but it down's trouble me. I think you can null it somewhere in a setting.
  29. S

    how was parallel solar done before microinverters

    I've got a challenge for you. I lock you in my shipping container where the inverters are. I put a leaf on one of the panels. All you have to do is identify which string is now Fubar as a result of the leaf. You get it wrong, you stay in there. How confident are you in your statement?
  30. S

    Direct PV water heater MPPT controller

    I'm glad you can laugh at the comments, rather than get rattled by them. It's clear that you've put a great deal of time, effort & thought into Loadmaster & arrived at a very good design. Congratulations.
  31. S

    Impress your friends with a 3kw electric kettle

    I've got a 3kW kettle and a 430kW car. (EV) Time is precious - I might be dead tomorrow (especially with that car...)
  32. S

    Can I change address of jk bms

    Giving this newb a nudge - I'm interested too
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