diy solar

diy solar

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  • Post in thread: Who is still building DIY batteries

    My battery pack is 128 LFP 280AH 48 volt system. It is self-balancing and keeps the cells within 10mv. I have 2 Overkill BMS 's and also two 5 amp balance boards. I balance just the top end of the Cells. The balance boards turn on at 54.2 volts to keep the Cells all good. Everything on the...
  • Post in thread: Post your Ground Mount Setup

    I have 10 of these in the yard. I adjust the tilt each month to maximize the solar. The supports are 2" galvanized pipes cemented into the ground. I use super struts from Home Depot for the cross support of the panels. Everything is bolted together with 1/2" bolts. Things have been up and...
  • Post in thread: Terrible Signature Solar / EG4 18Kpv Experience - Returning and Replaced with Sol-Ark 15k

    I found this thread to be rather interesting in a number of ways: OP had a simple requirement. Use the batteries with the inverter from 3pm-9pm to power around 1500 watts of load. At 9pm then switch the inverter to pass through. In other words use the grid to power the 1500 watts of load. At...
  • Post in thread: My Solar System in Maine

    I just wanted to share my system and maybe give back a little bit of all I have gained from you. First a big thank you for all of your insight and knowledge. It was a big help on obtaining a quality system that should last for years to come. My wife was the great instigator of the project. She...
  • Post in thread: House burned down

    This is my summary of the fire. The Cells are arranged in 16s x 6 with fuses between each bank. After the fuses the banks are then connected together with a copper busbar. In order for one of the fuses to blow, then there would need to be current flow of in excess of 200 amps. The fuses were not...
  • Post in thread: Our NEW GO-TO LiFePO4 vendor...09.20.21

    I purchased 16 of the 280 ah cells dealing with Jenny Wu from Docan and I could not be happier with the results. I did not top balance them before using them for a 48 v system. When the cells started to reach 3.5 V+ through the charge controller then I was able to top balance the ones that...
  • Post in thread: Solar System to Run Electric Pool Heater Off Grid

    I live in Maine and I can get our pool up to 87 degrees with 10 4' x 8' solar hot water panels. The water comes out at 130 degrees with a 5/8" garden hose. I calculated out the btu's and I think it was around 160 kbtu per hour. I picked up the panels on the cheap from someone who removed them...
  • Post in thread: December PV starting off crappy again.

    I did pretty well for the month of December. I made 605kwh so far. I make sure the snow if off the panels and adjust the angle of the panels to help with the low sun position. My daily low was on December 18th for .94kwh. My daily high was on December 8th for 47.14kwh
  • Post in thread: Signature Solar Two Hours On Hold Just To Buy an Item!

    I look at SS as just another company. I know a lot of people have dropped some serious money on their stuff. Also a number of people in this forum have had issues with some of their stuff that was purchased. It seems to me after reading all of the complaints and what not regarding SS then it...
  • Post in thread: AIO vs separate components

    AIO have much higher idle current than seperate components. I believe that DIY battery banks, Charge Controllers, Low Frequency Inverters in the long run are a cheaper and better than the AIO. You will probably pay more in the short term but I think that with the savings rendered by less idle...
  • Post in thread: Bulges on side of cells during top balance

    I never have top balanced my cells to 3.65 volts. It seems to me to be a waste of time and also lots of potential to go wrong and possibly reducing my cell pack capacity. I just hooked my 128 cells up to how I was going to use them and then hooked up my charge controllers and my inverters and...
  • Post in thread: Question for DIY battery builders

    I just added another 64 LFP Cells to my system to make a total of 128 LFP Cells. They are 280 AH Cells. I purchased them from Docan Power. All the Cells were pristine in appearance and the voltages were all within 3.304-3.306 volts except for one cell which was low at 3.256 volts. The cost was...
  • Post in thread: Cell price drop

    Hmmm. Maybe I should go with another 128 280ah Cells.
  • Post in thread: Pre-charge resistor seems crazy

    Not that big of an Arc? I wish that I would have saved my 200 amp disconnect switch that I ruined. I took it apart and the contacts had some nice big pits in them. If I still had it I would post the pictures. It totally destroyed my contacts. When I was a bench tech back in the 80's I use to...
  • Post in thread: I fear Magnum is done.

    I see a number of the Magnum units on Amazon now. I am running two Magnum mspae 4448 inverters. They have ran rock solid for the year I have owned them. I use around 30kw a day through the Magnums. The Magnum expandability is really great. I am running two Magnums networked together and you can...
  • Post in thread: Deciding to DIY my solar battery was one of my worst mistakes ever

    I am sorry that you experienced such extreme challenges on assembling your battery pack. I found it to be a very rewarding experience. First off, the compression thing is not for me. My Cells are not compressed and are doing fine. Top balancing wasn't for me either. It just seemed like a...
  • Post in thread: Lead Acid vs LiFePO4

    I originally was going to go with 6 volt lead acid batteries. They are rated at 75 amps for 120 minutes. They cost about $110 each. So each battery has 900 watts or .122 per watt. I ended up purchasing 64 LFP Cells (280ah) for around $9500. That figures out to 57344 watts or .166 per watt. Now...
  • Post in thread: Voltage drop very fast on load

    I seriously doubt that you have 200amp batteries. The math just does not add up
  • Post in thread: WHY do all-in-one Solar Power Inverters have a high idle consumption? Asking to learn...

    After having my Magnum Ms-pae 4448 for a while, I can say that I am totally impressed with the idle current and efficiency it has. In Maine we have plenty of days without sun and the batteries have never discharged to the point of the inverter totally shutting down. I think the ide current is...
  • Post in thread: Literal ground mount

    Windy here as well. This is what I use and built from material at Home Depot. Wind rocks it a bit but it seems to be working great.
  • Post in thread: Bricked brand new EG4 3kW 3000EHV-48 (Warning Code 19)

    This forum is an excellent way to get a positive outcome from SS. I don't think I would waste 2 hours of my time on the phone trying to get an inexperienced tech. A better approach would be to just describe what is not working on your equipment and then just reference: @SignatureSolarJames or...
  • Post in thread: Another Recommendation for Docan / Amy Zheng - EVE LF280K

    I have purchased 64 cells in Feb 2023, 32 cells in Apr 2022, and 16 cells in Feb 2022. All of the cells came from Docan. The cells were all pristine with no bloating. One of the cells most recent purchased had a voltage variance it was 3.256 volts. The other 63 cells were between 3.304 and...
  • Post in thread: House burned down

    I sympathize with you. Your build looked to be a professional build looking at your previous post. When fuses blow, then there is a root cause for the fuse to blow as I found out with my 93 Dodge Ram truck when one of the fusible links blew and the mechanic changed out the link without...
  • Post in thread: What makes you happy?

    February, back off grid again until November.
  • Post in thread: MPPT maximum voltage - why no safety margin?

    I will give you an example of what I experienced today. It is a cold day around 20 degrees and partially cloudy. I have 4500 watts of panels. My peak power today was 5530 watts and 137 volts. I have hit 142 volts so I know the voltage does go up with the cloud edge. It is something to consider...
  • Post in thread: System help/info

    Without a generator, then it will be difficult no matter what you do. When the sun plays possum for days on end and the snow comes down for a few days, then it kills all your solar no matter what you have. I have batteries for 3 days and 42 panels and the months of Nov-Jan still find me needing...
  • Post in thread: Batteries really depleted overnight or is it a BMS problem?

    He has 2 200 ah batteries. It will take a minimum of 40 hours to charge the batteries.
  • Post in thread: Help

    No it does not look good for you. The batteries are 110 x 12 = 1320 watts each. Lead acid you can only use about 50% so that means you have 1320 x 3 = 3960 watts /2 = 1980 watts available. A 2000 watt hot tub will suck those batteries down in less than an hour. It is not even considering the...
  • Post in thread: SHOW ME YOUR MEGAWATTS!

    My Solar total is 8.163 MWH since November 21. I recently installed a Smart Shunt to check for efficiency of Kwh put in the LFP's vs Kwh consumed by the house, and I was very pleased that I was able to use over 93% of the power put into the batteries. That includes idle current draw of the...
  • Post in thread: Best 280-304 to buy right now?

    The way I look at it may be different than others. I purchased 112 Cells from Docan and my experience mirrors @MrM1 experience precisely. The Cells work and as far as giving them a grade, to me is just a waste of time. Now that you purchased your cells then you can either test them to death and...
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