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    Orison plug and play battery

    I just ran into this ‘plug and play’ battery being developed by Orison: https://orison.com/product/ I’ve seen some posts on the Forum about whether these batteries can be used to provide backup power or not, but that is not my focus (nor is the question of whether the Orison battery is...
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    Solid State Batteries

    This guy does a really good job showing how Lithium Ion batteries work and giving an overview of what is on the horizon with Solid State Batteries:
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    What happens when a battery charger is starved?

    I’m looking for ways to charge a battery only with available AC-coupled solar power, which has led me to wonder the following: ‘What happens to an AC-battery charger if it is only powered with a fraction of the AC power is requires?’ Let’s say, for example, I’ve got my 10A 24V LiFePO4 charger...
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    Victron vs Schneider vs Solark vs other

    I’m looking for a hybrid inverter with the following features: Supports ‘zero-export-to-CT-sensor’ capability using an external CT sensor or energy meter on grid input wire(s) Supports variable-battery-charging-for-zero-export, meaning it will prioritize available AC-coupled solar energy to...
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    California Members: NEM3.0 impact on NEM1/2 customers and what to do?

    Since the CPUC is expected to issue it’s ‘decision’ on NEM3.0 this month, I figured I start a thread about the impact of the new NEM3.0 terms and whatever phase-in gets decided for existing NEM1.0 & NEM2.0 customers. There are many changes being bandied about, but what the utilities are...
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    Future of DIY LiFePO4 looks bleak…

    I think the trend both with lower and lower cell cost/Wh as well as the arrival of more and more finished LiFePO4 batteries at lower and lower cost means it’s just a matter of time before building your own DIY LuFePO4 batteries from cells is not going to make any sense. Today, you can purchase...
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    Which is worse, discharging to empty or charging to full?

    To extend lifetime of LiFePO4, the general recommendation is to never discharge below ~10% or charge above ~90%, but the impact of those two distinct events cannot be equally damaging. So which will result in faster cycle life degradation: -never discharging below 10% but charging to 100%...
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    New class of zero-export AC-coupled battery inverter (Huayu)

    I just stumbled onto this, and as far as I know, it is the first example of the new product class I have been pineing-for / predicting: https://m.huayu-solar.com/Content/uploads/2021694206/PDF/AC-Coupled-Quick-Installation-Guide.pdf This AC-Coupled battery inverter being introduced by Huayu...
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    Deye SUN-3K-SG04LP1-24-EU

    Finally, believe I might have found a 24V Hybrid Inverter supporting Zero Export to CT Sensor capability: https://www.deyeinverter.com/deyeinverter/2021/09/08/【b】hybridinvertersun-3-6k-sg04lp1.pdf It’s not even clear to me whether these are available for sale yet, but I wanted to start a thread...
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    Export Limit with Growatt inverters?

    I just found this: http://www.ginverter.com/Export-Limitation-Solution.html It suggests that Growatt MIC and MIN Series inverters can be controlled for zero export using a remote CT-sensor-based ‘Growatt Meter’ I’m curious whether we have any members out there successfully using Growatt...
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    Least expensive LiFePO4 batteries approved for use with permitted Solark installs?

    So I just saw that Solark has an approved set of battery ‘partners’ which have received UL 9540 certification: https://www.sol-ark.com/battery-partners/ I’m trying to understand which of LiFePO4 batteries are the cheapest to get through the permitting process.
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    Safety certifications needed to get a LiFePO4 battery permitted?

    I’m curious for members that have gotten battery-based PV systems permitted, what level of safety certifications are being required by local building departments in order to get batteries approved as part of the plan? For example, here is a Humless LiFePO4 battery listing their safety...
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    Solark owners - how did you succeed to get a permit without grid-tie agreement?

    I just found the Solark manual: https://www.altestore.com/static/datafiles/Others/Solark_8K-install-owner-Manual-8-3-2019.pdf Section 5 Mount Transfer Switch shows a wiring diagram with grid AC connected directly to Solark AC input without any Automatic Transfer Switch located in between...
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    GTIL inverters and Autotransformers

    I’ve got two these 1kW GTIL inverters powered by a 560Ah 24V LiFePO4 battery offsetting consumption daily (one per leg)...
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    300KgF clamping fixtures and capacity loss?

    I just saw a post where a member stated that applying pressure to EVE cells extends cycle life but at the expense of some initial capacity loss and it’s the first I’ve heard of that. Has anyone characterized capacity loss on their EVE 280Ah cells after clamping at 300KgF / 12psi? Does EVE...
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    Two MPPTs on one string through diodes?

    I’m looking at adding another string to my DC-coupled 24V system and I’m mulling the idea of having the new string primary-connected to a new 1kW GTIL inverter and secondary-connected to my existing SCC, both connections being made through forward-biased diodes. The new string has slightly...
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    Huayu Microinverters

    The Huayu Microinverters will apparently be offered for sale here in the US: https://www.huayu-energy.com/ The HY-2000-Plus quad-Microinverter has some impressive specs: https://www.huayu-energy.com/cpxq?product_id=7 The 240VAC / 60Hz support makes it sound as though these Microinverters...
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    Anyone using Deye Microinverters?

    Another member has turned me on the the Microinverter offerings manufactured by Deye: https://www.deyeinverter.com/product/microinverter-1/ Their older ‘G2’ model included a quad-MPPT 1300W Microinverter designed to support 4 panels of up to 400W each including the SUN1300G2-US-208/240 model...
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    AC current meter with programmable relay?

    I’m toying with a plan to add some additional PV capacity to my grid-tied AC-coupled system but need to make sure I never exceed my export power cap of 3.5kW. I’ve got a large 24V battery and activating a 10A AC charger whenever current on a leg exceeds 14.5A would be an easy way to ‘dump’ up...
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    Microinverters for high-output panels?

    With the new generation of high-power panels exceeding 500W and even 550W, I’m interested in understanding whether there are any Microinverters out there compatible with these new high-power panels? For example, Santan Solar is currently offering this 530W panel from JA...
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    Very basic DIY BMS questions

    I see there are some existing threads on DIY BMSes but they are all focused on designs-in-progress and I did not think it would be appropriate to pollute those detailed threads with my very basic questions. I’m using a 300A ‘dumb’ Heltec 8S BMS and everything is working fine. But I’m starting...
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    Using a shunt/monitor to track daily Ah?

    My SCC tracks and displays daily production in kWh, but since the battery voltage changed during the charge cycle and there are losses in the wiring between the SCC and the battery, I’m interested to independently track daily production in Ah. So I’m thinking of picking up a budget 100A shunt...
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    Nail test on LiFePO4 versus NMC

    https://www.autoevolution.com/news/nail-penetration-test-shows-how-different-ternary-and-lfp-cells-are-171294.html
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    How seriously should you take BMS Max Charge Current spec?

    I’ve got a 300A Heltec BMS that I’m happy with but it has a ‘Maximum Charge Current of 100A’ It’s a common-port BMS and so my first question is to understand how the max charge current and max discharge current can be different in a common-port BMS? And assuming there is a good reason for the...
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    Monitoring pack pressure for safety

    I’m concerned enough about the 2-3 reported fires here on the forum that I’m considering adding a pressure sensor to my 16-cell LiFePO4 battery pack. I’ve already got my single-line of cells in a 300kgf clamping fixture which I’m setting to ~12psi @ 50% by counting turns on my 8 calibrated...
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    Best current turnkey 48V LiFePO batteries?

    The LiFePO4 forum is for DIY, so I thought it would be more appropriate to post this question here. I’ve built a 560Ah 24V (8S) battery from cells and am happy with its performance (especially given how little I paid for the cells). I’ve got it hooked up in a simple 1.1kW GTIL-based solar...
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    Using load and generator relays on Epever SCCs

    I have a Tracer AN 6420 and have it generally working the way I want but am unable to control the generator control relay and am interested in advice from anyone who has done so successfully. The Epever documentation is piss poor so some basic questions for anyone who has figured this out: 1/...
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    What to do about shallow threads? (help!)

    I just got in two new 280Ah cells which look great but the tapped aluminum threads are very shallow (3 to 3-1/4 threads deep). After already having stripped a thread that was only 4 threads deep and having characterized that all of my other threads were ~5 threads deep, I’m pretty certain that...
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    How to test/characterize cheapo Chinese ‘MPPT’?

    I purchased one of the super-cheap deck-of-cards-sized blue MPPT last year and sent it right back - it was clear it could never handle the 30A it was supposedly rated for. These just showed up on Amazon and I couldn’t resist checking one out...
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    All-time peak output day today

    I’ve got a 5-year old 4kW Microinverter-based grid-tie array and I believe I witnessed my all-time peak output level today at 3.475kW. The BDM 300x2 Microinverters I have are rated for a peak of 300W/panel or a sustained output level of 250W/panel (so 3kW sustained or 3.5kW peak for the whole...
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    Pros and Cons of Boost Voltage for LiFePO4?

    As I’m understanding more about solar charge controllers for LiFePO4, I’m finding two types: Simple SCCs that have just two voltage settings, the first sometimes called ‘Constant Voltage’ and the second sometimes called ‘Float Voltage’. The charger charges at maximum current until the Battery...
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    Best mppt charge controller for LiFePO4?

    I was getting set to jump on an Epever MPPT charge controller but between reading some of the struggles members have had getting their Epever MPPTs to not overcharge their LiFePO4 batteries and this warning I found in this Epever document...
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    Epever Tracer AN high-current won’t support LiFePO4???

    I’m thinking about getting one of the new Tracer AN 200V 60A MPPT charge controllers, but in reviewing this presentation: https://www.epsolarpv.com/upload/file/1812/EPEVER%20Tracer%20AN_Main_Pres.pdf I found this statement: High current series doesn’t have self-activation function for...
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    Loctite primer necessary?

    I’m gearing up to secure my first stainless grubscrews into aluminum 280Ah terminals with Loctite Red and see that the instructions state that Primer is needed when both surfaces are ‘inactive metals.’ Stainless is an inactive metal and so is Aluminum, so it seems like primer is required. But...
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    Any issues maxing out an Epever Tracer BN?

    I’m planning on powering a 40A Tracer BN Series MPPT with a 3P string of 3 450W panels and would appreciate feedback from anyone using Epever BN Series MPPTs if maxing out the charge capacity is something to avoid. My existing AC-coupled PV array pretty much never exceeds 75% of rated power, so...
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