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I'm looking to build my first solar array for a off grid home I'm building. To start, I'm thinking around 10kw give or take. I'm thinking about used panels just because they're cheaper, but I'm still not sure if that's the way to go. Would either of these be good panels to start building my...

Just an update if anyone comes across this thread having similar issues. MPP Solar sent Ian, who forwarded it to me, some software to fine tune the voltages on my inverters and I was able to get them dialed in to 120.0v. So far so good, all my inverters are finally cooperating with each other as...

I've come across info about v notch weirs but that's the first I've seen of a circular weir, I'll have to look into that more. I wasn't confident in doing the math for a weir, but if I can get a base estimate with a bucket test using a 55 gallon drum and it seems like it's going to be enough...

You are correct, it's Amy Zheng. I have been talking with her about the catl cells, I would be very interested in hearing about your experience and the quality of your cells once they arrive. Throughout our conversations, she has been very helpful.

I appreciate the suggestions, and understand reducing kw usage is the best way to save money and improve efficiency. But, that's not really what i was trying to ask. I'm trying to wrap my head around what it's going to take to keep my house online while the batteries are charging, weather it's...

I'm still working on this problem, I've contacted mpp solar, they want me to send data logs from watchpower after the inverters have been in a while. They haven't said the inverters won't do what I'm asking, but they haven't said they will either. I have a 8500w split phase 240v generator with...

I'm building a new house, going to be off grid. I want to power a 100amp 240v service panel. My thoughts are that I'll use 4x 6000 watt linkable inverters. I'm thinking I'll have 4 separate 16s 48v strings with my 64 280ah cells. - Budget, is not unlimited, but I'm willing to spend what i need...

With voltage curves being so flat on prismatic lifepo4 cells, if one group is off line for a while and there's even a 20-40% difference in capacity, as long as it's only a few tenths of a volt, would it be that big of a deal to reconnect it to the rest of the packs? Wouldn't the rest of the...

Not yet. I had my system partially setup temporarily, I'm in the process of moving it to its permanent location and plan on looking into it further once I have it setup again. I emailed Mpp solar, they didn't have a immediate solution, but they didn't say that the inverters won't do what I'm...

I'm thinking separate strings, paralleled. Then if I need to remove a string for some reason, I dont loose an inverter. I'll look into that link about the energy audit.

I have 4 lv6548 inverters, and I'm currently trying to learn how to set up the first 2 in a temporary fashion at my current home, before I take them and my 64 CATL lifepo4 cells to my off grid build site with no internet or cell service. I have charged and discharged my cells a couple cycles now...

You're running 2x 6kw growatt inverters? What models? Im looking to run 4x 6kw, and i keep coming up with 3-5kw growatt inverters that are stackable.

I got the program software from Ian at watts24/7.com or usamppsolar.com, I believe he is the main distributor for mpp solar in the USA. He was extremely helpful throughout the process of getting my inverters up and running, but I bought my inverters and solar panels through him as well.

I appreciate the suggestion, but I think it's too much water for a bucket test. The stream coming out of the culvert is wider than a bucket, and I'm pretty sure it would fill the bucket instantly. I doubt I could hold on to the bucket and don't think I could time it accurately. Also, I'd have to...

Are any of the lights around the LCD display lit up, particularly the fault light? Does anything happen if you hold the enter button for about 5 seconds?

A 55 gallon drum may be more feasible. I'll have to see if I can float it out there and try to time how long it takes to fill and sink.

I expect to charger to charge the batteries with the AC input, while the inverter is producing AC output. It seems that if the AC output load is less than what the input is seeing then the excess should go to the charger and then batteries. Then as the load increases it should start to...

Dosen't seem you resolved the issue, you just bought a external charger? I have a gas 8500 watt generator I plan on using a 7200w, 240v split phase at 30 amps, until I figure out if I'm going to need a bigger probably diesel generator. I may end up getting a small charger like on your thread...

This is my thought, and to add to it, if AC output exceeds AC input, it should draw the balance from the batteries.

I don't think i have enough head for that type of setup. It's only about 10' from the surface of the top pond to the surface of the lower pond.

They're replacing some lead acid batteries at work. These are the new batteries, the old ones are the same size but don't have specs on them other than being dated 2005. If I can talk them out of the old batteries, would they even be worth having being 15 years old? I'm building a off grid...

I was told these specific batteries weigh 550lbs each.

They are 280ah cells, so if I understand that math correctly, 120a is less than .5c. Im building a house, so i can't really test my usage at this point. I understand I'm best to limit usage, and i don't plan to run at 100% loads for extended periods of time, but the instances where the water...

The old batteries are not C&D, I'll try to get a pic of them. Would changing the acid do anything for the old batteries, or does the sulfation ruin the lead?

I'm no expert, but happy to share my experience. I used 225a ABB SACE S3N, and I'm still trying to figure things out. It seemed pretty straight forward when I was looking at them, sounds like you know what amp ratings you want and that you're looking for the 24v shunt trip. It seems all the ABB...

I do not have solar available yet, but have plans for it. I'm trying to work out some of the bugs at my on grid home with the input hooked to my breaker panel like a normal appliance, before i take this system to my off grid location where I'll set up the solar panels.

I've changed the settings to what you've suggested, I'll see what it does once my voltages gets that low and let you know. This isn't really what I'm looking for though, I'd like the input to charge when available regardless of the voltage. If the sun has gone down and I'm at 52 or 53 volts...

These are the batteries being replaced, i was told they're 4 cell and 2 volts per cell, don't know the amp hour capacity. There's 30 total.