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    One cell level too high - LiFePO4

    According to my BMS, I have one cell of of an 8S LiFePO4 battery that is significantly higher then the other seven (3.6 vs 3.35V at full charge). Other than doing a discharge then top balance all 8 cells, is there another method that would get this cell back in line? Would a discharge of just...
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    Will this panel wiring work/be safe?

    I have three 455W panels already roof-mounted, and wired in parallel. I'd like to raise the PV voltage coming to the controller. I would like to make the least wiring connection changes as possible to series connect two of the panels. Would the wiring to the panels shown in the photo accomplish...
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    Which solar controller for off-grid system?

    Hi, I’m designing an off-grid system, planning on three 450W panels (but may expand to 6 eventually), 12V LFP batteries (three in series, but could buy 1 more and go to 24V). The batteries will have BMS protection from under/overcharging. What solar controller do you you recommend? Is series or...
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    US or Canadian source for solar panels?

    Hi, I need to buy 5 panels in the 400W range. Any domestic or Canadian wholesalers that you can recommend? Thanks!
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    XiaoxingBMS update issues

    I have two “models” of 4S JDB BMS units. They both worked well under the XiaoxingBMS iOS app, until the recent software update. Now one BMS units works fine, but the other can’t update any changes to the BMS configuration. Anyone have similar issues?
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    Voltage difference between LFP batteries connected in series

    I have two EVE 280 Ah LFP batteries (12V each) connected in series (24V) each with its own BMS. The BMS settings are identical. They are charged through a Growatt 3000W inverter through either solar or line AC. Early on the individual cell and total battery voltages were very close, but lately...
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    Adding battery backup to existing grid-tie system

    I’m not new to solar systems, having built my own off-grid system with DIY EVE 280Ah LiFePO4 cells, a Growatt 3000W all-in-one inverter, and 2000W of solar panels. I understand grid-tie systems, but have not worked on them. I’ve learned a lot from this forum and Will’s videos. So I thought it...
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    Turning Growatt on/off remotely

    Is there a simple way to turn the Growatt 24V 3000W unit on/off remotely, using either wireless or wired connection? My Growatt is in the engine room of my boat, and it’s a pain to turn it on and off. I don’t like the idle current draw, and so I shut it off when I’m not on board. I heard the...
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    Victron vs BMS amperage displays differ

    I am trying to sort out a mystery in charging displays in my marine DIY system. Here’s my setup: - I have four 12V batteries, each made with the 280AH EVE cells. Each battery has it’s own 4S BMS. - The four 12V batteries are connected in a 2S2P arrangement, that is, each pair is connected in...
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    Charging LiFePO4 batteries through Growatt 24V 3000W

    So, I have two 24V banks of LiFePO4 batteries on my boat, connected to a Growatt “all-in-one” 24 V 3000W inverter/charger/solar controller. As many have noted, the idle current draw of the Growatt when it is ON is considerable, so I like to leave it off, as I am away from the boat for days. I...
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    Wire gauge recommendation for solar panels to controller

    Hi, I am installing an off grid generator on my boat. I have three (3) 400W panels, planning to connect them in series. Each panel produces a max of about 40V and 10A. The wire run from my panels to my MPPT solar controller will be about 40 feet. My solar controller will be charging a bank of...
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    Connecting two 12V batteries -BMS question

    I am building two separate 12V batteries from eight 280Ahr prismatic cells, but I plan to connect them in series to create one 24V battery. I’m not connecting all eight cells in series directly because I would like to keep the weight down, taking them in and out of my boat As 12V batteries...
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    Solar enthusiast trying to replace diesel generator on yacht

    Hi, I’m Allan from CT, USA. The 8kW generator on my yacht just died, and I’m exploring the idea of replacing it with a solar generator. I don’t think I need 8kW, as I don’t need to run all the AC appliances and all three air-conditioners at once! Instead a generator that will run a small fridge...
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