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Glad to have found this forum. Although I’m quite knowledgeable on Solar system design, my knowledge on Lithium Iron Phosphate batteries and BMS behavior has a few holes. I’ll post my questions in the appropriate forum section(s)

EDIT- update - 1. After charging properly with solar, full charge for the two in parallel was achieved with a 14.5 volt absorb and 13.8 float. (I’ve since adjusted the float down a bit), 2. Charging freeze protect IS working. Low was 25F last night. The BMS did not allow current until the...

I just bought two. Charging individually now, but don’t have solar due to snowstorm, and my old G7200 NOCO is as slow as molasses. so we can compare notes.

I have a travel trailer. I was going to purchase 2 100aH batteries(each has a 100a BMS), but want to occasionally use a microwave with an inverter. The inverter would need to be 1500-2000 watts to power the Microwave(13 amps at 110V). This would mean drawing over 100 amps at 12 volts. Fine, I...

I view Renogy as an outfit that markets and rebrands Chinese products well, including user friendly manuals. if you read reviews from those that have problems, however, their customer service is lacking to non-existent. I’m cheap, so I usually put up with EPEVER vs Victron, Chinese batteries vs...

I’ve found those 200 watt panels do not come close to advertised figures. i have a 100 and 60 watt panel on a.van that produce more into the battery than a single 200. When i had the panel off the trailer, pointed perpendicular to the sun on a cold winter day, I think I saw 170 watts from the...

Once I got my solar controller working they went up the same. My controller then drops to a 13.6 float, so if I’m not watching I can miss it. I also discharged with 1400 watt continuous actual load(convection microwave) on a 2200 watt inverter and it worked fine. This was two in parallel, so I’m...

I second Ironridge. I live in a very windy area where the snowload and wind requirements have changed alot in recent years. The design program Ironridge uses has a huge database of panels and locations, letting you specify wind area specs and snow load and the exact panels you use and it will...

That one only has a 100aH BMS. Fine for most applications, but not for larger inverters. Seems like it’s tough to get everything in a low cost battery. Getting better, though. BTW, I just checked - that battery is currently unavailable.

Me too. I’m almost done charging the second one. Gonna have to invest in an updated charger, as I doubt it’s fully charging withe the NOCO.

Here is what they say: the low-temperature detection temperature of charging is -10°C. When the low temperature weather is 0 to -10°C, the battery will be charged with a small current when charging starts, and the battery will start slowly. After the battery is slowly heated, it will be charged...

Electronics engineering. Software, Firmware, and Hardware to monitor, digitize, and diagnose faults on large rotating machinery.

Seems like your tests and tear downs have had some effect on these cheap Chinese battery introductions. If good, they’ll raise their prices such that they are profitable and possibly keep up with increased demand. If bad, they will probably go out of the battery business and sell something else...

i am starting a design of a grid tie system with net metering for my house. Did this almost 10 years ago, and it did not pencil out due to our low energy costs in Northern Nevada. But I see things have changed, so I think it’ll work. My current usage would be covered by a 4-5k system but I’m...

I was In the middle of testing them, but an unrelated, more urgent problem came up. I charged them up with an older, supposedly Lithium compatible charger. Not 100% sure, but I think the BMS blocked current once 13.44 volts was achieved on one, and 13.31 on the other. These voltages held after...

Not a problem. Several of us use multiples of these batteries in parallel. So we get an effective 200, 300, or more discharge rate. at 12V. Some 200aH 12V batteries have a 200aH BMS; some have a 100aH BMS. Would have loved to have used a single 200aH battery instead of two Lisuatelis, but...

Did you actually test the temperature of the battery? Internally, it may still have been above freezing, and they claim a sliding scale of current allowed from - 10C to 0C. I think one would have to keep it below freezing for several hours to get it cold enough due to thermal mass. I have a low...

I have a 2200 watt pure sine wave inverter that I want to hook up to several circuits. Originally I was going to route the output to an ATS. But it’ll be quite a bit of work to route the 120 volt inverter output. So I am looking at wiring a 15 or 20A waterproof receptacle, either through the...

Nope

I see many poor ratings for Growatt and min, which is why I wasn’t considering them. Seems most failures are a couple years down the road, and replacements are not available. Reliability is my main criteria. Don’t want to touch the system after it’s installed, which is why I was going name...

My Z80 experience was designing a CP/M computer and BIOS. The computer had many Hundreds of feet of wire wrap on it. Later a friend produced a single board computer with pretty much the same design, and I went to work for him. Got written up by InfoWorld as the fastest CP/M computer they tested...

Did you get this? Seems like a deal….

ATS for me means some conduit under the rig with a couple 90 degree bends, and working in a tight, hard to access place near the load center. Way easier to run a socket from the batteries/inverter which are inside on the shore power side of the rig behind a hatch. i’ve already been plugging in...

Not even sure of that. I’ve not seen that many amps going in with a 190 and 200 watt panel In parallel. i’m thinking of re-wiring the panels in series, like you, as my wiring from the panel is sized for one, not two panels In paralell. One thing I’ve noticed on these panels is the Vpp is pretty...

Thanks. That’s what I thought. I just didn’t know how the BMS could effect the presented internal resistance. I’m going to post where I read this.

A quick update - I charged with my solar with an approximately 0.1C rate(10-11 amps. It looked like it went into balance mode, It was hitting above 14V then the BMS (I assume) shut the current off(well, maybe a milliamp or two). After resting the battery, it was at about 13.8V(3.45 per cell.) so...

Yes, of course. But your point?

A great review is on solarquotes.com.au Or you can search google - Reddit and others are full of criticism Even a global search on DIY solar using terms “Growatt failure” Fronius is not 4x the price. One can get a 6K for $1400 (more if you want wifi and not direct connect ethernet) Maybe their...

That’s great With the SOKs. Sounds like they are a premium brand. My “microwave” is actually a convection/speedcook microwave. Still1500 watts, and basically adds a resistive element for the heater, so no surge there. Maybe 13 amps, so no problem. Don’t really plan on any A/C use, unless I get...

In one of the reviews(perhaps for the sister product, which doesn’t have side USB ports), someone did a test and said it dropped charging down to a fraction of an amp, then changed to normal once the temperature came up. I’m a bit concerned with balancing; my charger says it does lithiums at...