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Most reacted threads

  • TCT & MPPT

    Background info I have an MPP Solar Hybrid LVX 6048, which uses Maximum Power Point Tracking (MPPT). TCT refers to a "total cross-tied" panel array wiring configuration, like the configuration pictured at https://www.researchgate.net/figure/Total-Cross-Tied-TCT-configuration_fig2_316359468...
  • Apexium 280 BMS charge profile settings - translating from English to English

    I assembled the Apexium 280 battery box, and am trying to set the charge profile in the BMS Bluetooth app. Here are the default settings that appeared when I opened the app. https://photos.app.goo.gl/XksgCUqSC4hkMQ9q6 I want to set this charge profile, taken from...
  • Apexium 280 battery box gap next to cells

    I'm assembling a Apexium 280 battery box I got from Jenny Wu / Docan Power. Its build quality seems excellent. I noticed there is a small gap between the left group of cells and the central metal frame member. The gap is about the thickness of the foam pads provided in the kit. The assembly...
  • 5kW 48V system sizing, circuit & safety check

    Hi, I'm designing a 5kW 48V system to upgrade my camping trailer from having 12V batteries and a 120VAC to 12VDC converter to having 5kW of solar panels, a 48V MPP Solar Hybrid LVX 6048 all-in-one, a 17.9 kWh 48V battery, and a 48V-12V DC buck converter. My current design is attached. Did I...
  • Insert all-in-one & LiFePO4 battery into RV's existing system with converter

    I'm designing a solar power system for my trailer, to permit me to power my computers during work hours and travel with my family. I want to insert an all-in-one and LiFePO4 battery into my RV's existing electrical system, which includes an AC to DC converter, but I'm not sure about the precise...
  • Mixing 12S1P + 4S2P to stay at 48V but increase capacity

    To make a 48V battery with at least 17.9 KWh of capacity, I intend to buy 5 packs of 4 Lishen/Eve 3.2V cells, which is 20 cells. I can make a 48V battery using 16 cells in series, making a 16S1P battery, but then I’ll have 4 cells left over, unused. I want to use those 4 leftover cells in...
  • Unexpected voltage drops in panel array

    As I mentioned at , Our panels are in a 7 series 3 parallel array, labeled 1-7 and A-C, respectively. We tried shading various panels in the array to see how it affected the whole array’s open circuit voltage, so we can discover if a total-cross-tied configuration produces more power under the...
  • Fact check: Do All-in-ones burn off unused PV power as heat?

    The fellow behind the counter at a solar store gave me some good advice, but stated a few things on which I'd like to get a second opinion. Here's one: The MPP Solar Hybrid LVX 6048 all-in-one inverter will waste excess power coming from the solar panels by burning it off as heat. Is that...
  • Fact check: Higher volts requires larger gauge wire

    The fellow behind the counter at a solar store gave me some good advice, but stated a few things on which I'd like to get a second opinion. Here's one: 8 AWG wire could handle 9.6 A over 40 feet if there were only 1-3 panels put in series (creating 37 - 111 V), but since I plan to put 7 panels...
  • Do I need to top balance?

    I purchased 16 LFP cells and an Apexium battery box kit which includes a BMS from Jenny Wu. Everything seems to be in perfect condition. I am very pleased. On my first voltage test after opening the boxes, 12 of the cells each have 3.256 volts. The other four cells vary by only one millivolt...

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