diy solar

diy solar

Search results

  1. A

    Leave inverter on or cycle as needed?

    I would actually be shutting it down during the 12hr daytime, and have it on for the evening throughout the night and into the early morning. I'll look into the standby mode, but I doubt it. This was a used (likely open box) amazon special. It's actually held up pretty well so far.
  2. A

    Leave inverter on or cycle as needed?

    Thanks. I'm working on a solution for cooling the battery area (and perhaps the other components, too). I don't imagine the heat is good for any part of the system.
  3. A

    Leave inverter on or cycle as needed?

    If I had to define the points of this internal debate I'm having, I'd say it comes down to this: Does semi-frequent periodic power cycling the inverter damage the internal components faster than the constant use under hot conditions (albeit low, it's still using ~15W of power). This is assuming...
  4. A

    Leave inverter on or cycle as needed?

    Thank you. The power usage is a [secondary] concern, but I'm more worried about the longevity of the device.
  5. A

    Leave inverter on or cycle as needed?

    600W of panels 30A MPPT SCC 24V 280Ah LifePO4 100A Overkill solar BMS 3kW inverter This is an off grid setup. The system is installed in a vehicle. The inverter periodically kicks on the fan as it gets hot, even without a load. It draws about 15W idle. I only need to use the system in the...
  6. A

    How much current is okay 24v 280ah lifepo4

    Good point about the load being distributed across both banks. However, there will still be the full load applied to the output of the batteries, to include fuse(s), wires, equipment (like the inverter), etc. We are in agreement that to purchase such a stove warrants a larger system than what...
  7. A

    How much current is okay 24v 280ah lifepo4

    If OP has the funds to purchase a stove and increase the battery bank for a summer house, there's probably enough to get a bigger inverter. Also, increasing to 48V means a 100A draw instead of a 200A draw. That's less than .5C which should alleviate the original concern for battery life.
  8. A

    How much current is okay 24v 280ah lifepo4

    If 16 cells are to be used, wouldn't a 48V bank be better suited? That would reduce the current draw by half. OP would need the supporting equipment, of course.
  9. A

    Help!! AC for a cargo trailer- still confused.. Ecoflow delta pro?

    The custom build will almost certainly be less expensive. I would go with a 24V system or higher. As for a starting point, I think the guy who started this forum, Will Prowse, has an e-book or something that goes over all this. Someone who knows more about that can chime in. He also has a...
  10. A

    Questions About Will Prouses Beginner Friendly 48v system on Youtube. Load and Panels?

    The unit can take up to 80A of current. You would wire your panels such that the Voc in series is less than 145V and the Isc in parallel is less than 80A. Also note that the total input power is 4.5kW so the combination of panels should be within that range. The panels you mentioned can be...
  11. A

    Questions About Will Prouses Beginner Friendly 48v system on Youtube. Load and Panels?

    OP is in Utah, USA. Peak sun hours are higher than most other states. In the winter, it seems 4 hours is somewhat accurate. However, the summer sun should produce 6+. Since there is no real power budget, the ~10kWh assumption was an upper limit estimate. I agree that more panels would be...
  12. A

    Questions About Will Prouses Beginner Friendly 48v system on Youtube. Load and Panels?

    You'll do good with 8 of these. They are only 220W panels. I would try to get them for around $100 a piece. Make an offer for $800 for 8 panels and see what comes of it. Realizing I told you that shipping usually costs a significant portion of the panels, you might look online for some. Right...
  13. A

    Questions About Will Prouses Beginner Friendly 48v system on Youtube. Load and Panels?

    It's probably best if you start with what panels you can actually acquire. Then we can work with how many you'll need. People find out that the shipping on panels are quite expensive. Since your preference is having less panels, it's unlikely you'll want to buy enough to significantly distribute...
  14. A

    Pulsating LED lights, fridge & microwave light, when on solar charging mode

    From what I've read about inverter compressor technology, the compressor never really turns off (or at least it turns off much less than traditional compressors). It's constantly throttling. My best guess is that the throttling of an inductive load on your system is causing the observed...
  15. A

    Pulsating LED lights, fridge & microwave light, when on solar charging mode

    Sounds like your fridge is the culprit. What model is the fridge?
  16. A

    New from Portugal

    They were much faster than me. I think in the end, I was chasing them ?
  17. A

    Questions About Will Prouses Beginner Friendly 48v system on Youtube. Load and Panels?

    I could be wrong, but I think most extension cords that are rated to handle more than 1800W will have a different plug. There's something called a Nema standard. I would imagine a 12 gauge cord would have a different Nema plug than the standard 14 gauge cord. That means you might not be able to...
  18. A

    Small off-grid 12v system, 2 x 300w (36v 8A) panels, MPPT, series or parallel

    You can look up the efficiency of that model. Usually MPPT charge controllers are pretty efficient in converting voltage to current.
  19. A

    Questions About Will Prouses Beginner Friendly 48v system on Youtube. Load and Panels?

    If you don't have a plan to insulate the container, you're probably not going to have enough sunlight to run your AC as much as you'll need. Also, consider thermally isolating a space for you to cook. The 750W AC will likely pull around a 5kW surge. A 3kW inverter will typically support up to...
  20. A

    Small off-grid 12v system, 2 x 300w (36v 8A) panels, MPPT, series or parallel

    It's probably best to reduce the current when possible. Losses through wires are squared with relation to current (P=I*I*R). This would only apply to the wire carrying the combined currents from the panels to the charge controller. It's probably negligible as long as it's properly sized. I...
  21. A

    Out in the woods with lots of sunshine here in the South West

    Looks that way. It's probably best if you don't buy batteries from that dealer anymore...
  22. A

    Wiring two 12 volt 200 amp Lithium batteries in parallel

    Busbars are good for keeping things tidy and secure. The lugs on your 3/0 wires are fairly big. Overlapping them may be a bit hard on the battery terminals depending on the quality of your batteries. With only two batteries, you'll probably be ok with using just wires. Wires undergo something...
  23. A

    Do I need a pre-charge resistor for a 300 watt inverter?

    Good to bring it back into perspective. I don't know that I would use a 1/4W resistor, but I doubt anything like 1kW will be seen via the pre-charge.
  24. A

    Out in the woods with lots of sunshine here in the South West

    If they were charged separately, then you've got something wrong with your batteries or your charger. Each 12V bank is made of 4 cells. Dividing each voltage by 4 will give you the average voltage of each cell. Lifepo4 cells will be around 3.6V when fully charged. The charge profile of this...
  25. A

    Out in the woods with lots of sunshine here in the South West

    Are these lead acid or lifepo4? Or something else? I'm not sure about your readings. How did you go about charging them? How did you determine they were done charging?
  26. A

    Do I need a pre-charge resistor for a 300 watt inverter?

    I've caught one of these on fire once. In my beginning years, I forgot to take the power rating into account. I think I sent a very momentary 1kW through the 1/4W resistor. Lesson learned and not forgotten. Hopefully OP won't make that mistake ?
  27. A

    Heating Base for 12v LiFePo4 Battery

    The end product looks neat and tidy. You could use some edge banding if you want to hide the wood joints. But for a DIY garage battery heater, I wouldn't worry about it. Good job.
  28. A

    Gr00ldude48 - beware!

    That's unfortunate. Did you not get a phone number from him in your previous transactions? Surely there is an address he sends this stuff from. It would be a return address on the boxes he shipped in. Do you still have that? You could write a letter to him. You could call the bank and see about...
  29. A

    Battery build 48V 16s LF280K.

    Cool. I recommend not charging to 3.6V for swollen/used cells. Charge to 3.5V. https://diysolarforum.com/threads/recommended-charge-profile-for-diy-lifepo4-batteries-sticky-post.5101/ Have you considered an active balancer? It would probably help overcome the runners that are common in used and...
  30. A

    24v system: series vs. parallel battery options

    Not sure about OP's situation, but consider heating the van. A 1500W electric heater will draw 125A at 12V from the battery (more really due to the inverter [in]efficiency). A 24V system would draw half that. The BMS on a 12V system would need to handle that 125A draw, too (and the C rating on...
  31. A

    Can you hook Solar panels to a garage sub-panel?

    Also, don't overlook the fact that most houses run on AC, while the panels will produce DC. So you'll likely want to convert it via an inverter. So, no, you wouldn't really be able to connect your PV panels directly to the sub-panel.
  32. A

    Can you hook Solar panels to a garage sub-panel?

    I'm pretty sure you have to isolate your system from the grid via an approved device. Also, feeding raw PV power to your home is not a great idea. Usually you'll want some kind of controller to stabilize the output of the panels. There are legalities to what you're proposing and I'm not the...
  33. A

    Out in the woods with lots of sunshine here in the South West

    Is this a pure sinewave inverter? Are your batteries good? Are they charged? Have you checked to make sure all connections are tightened? Loose wires will definitely mess with your system.
  34. A

    24v system: series vs. parallel battery options

    Option A You have to make sure you are able to series connect 12V batteries. If you are allowed by the manufacturer, then yes, you can place two 12V 200Ah batteries in series to make a nominal 24V 200Ah battery. To expand that, you would need to add another 24V battery in parallel. It is...
  35. A

    Do I need a pre-charge resistor for a 300 watt inverter?

    You would need to know how big the capacitor in your inverter is.
Back
Top