diy solar

diy solar

Recent content by pekka8

  1. P

    My tiny off-grid power system

    Here is my "portable" power bank running off-grid in a cottage. There is grid power too so this is more a learning/hobby project. I designed the aluminum frame and equipment layout in CAD. Not the safest system: solar panel cables run to an anderson wall mount for decoupling and I have omitted...
  2. P

    Do PWM controllers/dimmers cause EMI noise? Alternatives?

    I can see or sense the flicker on my Samsung phone screen, for example. Installed a software dimmer app to solve that. Fortunately there are led lights that have voltage dimming (or is that the constant current controller?).
  3. P

    Do PWM controllers/dimmers cause EMI noise? Alternatives?

    (not getting any alerts from forum) I'm looking this from health perspective, both electrical and light flicker.
  4. P

    Powering USB-PD from 12V?

    Still looking. Now more power hungry so should be buck-boost GaN 100W+. Maybe it takes some time for those arrive on Ali...
  5. P

    Do PWM controllers/dimmers cause EMI noise? Alternatives?

    I would like to dim 12V fans and led lights. Easiest solution seems to be PWM dimmer switch. I have read, and it makes sense, that PWM causes electric pollution - EMI. Is this true, and if so, is there an analog alternative for dimming led lights? For fans it's easy to make diy resistors.
  6. P

    Lifepo4 battery getting tired after 6 months?

    Shutdowns continue even after fully charging the battery. This week got two while battery was between 40% and 65% charge (~13V). So something else is going on. Maybe water heater is just too much so I'll test if moving it to wall power helps.
  7. P

    watt hours probably dumb question

    I was just thinking about this too. So 200 Ah 12V lifepo4 is probably closer to 2600 Wh.
  8. P

    Do you need a switch or fuse in addition of circuit breaker?

    I have this Blue Sea circuit breaker as main battery fuse and switch: https://www.bluesea.com/products/7149/187-Series_Circuit_Breaker_-_Surface_Mount_200A Is this enough or should there be a additional switch and/or faster fuse? If so, why? I think you use a switch only when doing...
  9. P

    How to test solar wiring without light

    What is the source of current?
  10. P

    How to test solar wiring without light

    Just added an extra connection in the wiring path and I'm not getting any solar power. It's very rainy though so not sure if there should be any. Is it possible to test with multimeter that the PV loop that connects to MPPT is continous, there isn't faulty connections in the wiring?
  11. P

    Diy DC USB pd for laptop and highspeed charging for tablet

    Missed your reply. This one is only 65W per port but Baseus has also 160W model with 100W per port. Problem there is it charges at full power only for about 15 mins then thermal throttles to lower power. So something similar to this but a bigger with better cooling would be perfect. Maybe with a...
  12. P

    Lifepo4 battery getting tired after 6 months?

    Battery is this one (PDF): https://www.suomenakut.fi/storage/product_files/5/217305-TB12200_37eb50f171eaa10ba8aacdd46101e852.pdf That's all info I have on it. Battery monitor is Victron BMV-712 Smart. One thing came to mind: it has been cloudy here so battery hasn't had a 100% charge for a...
  13. P

    Lifepo4 battery getting tired after 6 months?

    I have 200Ah 12V battery feeding 3000W Multiplus II inverter. I know it's a bit underrated but I'm drawing max 1C. Max consumption is when water heater kicks in for couple of minutes at a time taking 2 kW plus ~400W of other constant usage. Six months ago battery would shut down when charge...
  14. P

    Use for excess energy without sending to grid?

    Heating air is 100% efficient, but conducting it to sand is probably not, unless heating is done in the same space.
  15. P

    Use for excess energy without sending to grid?

    I was thinking of starting to mine crypto again in same situation. But not sure it's worth the hassle even with free electricity.
Back
Top