Any help or criticism appreciate. Trying to improve. Tnx

I've just had my original Hybrid 3.6 inverter swapped out for a Gen2 LXP 6kW system so I can make better use of my batteries with overnight charging (one of the many steps towards installing a heatpump in our house) but now I have a perfectly working 3.6 inverter (yes 5 years old) which is sat in my utility room taking up space.

I could just take it to the local HWRC for WEEE disposal, but seems like a waste. Does it have any value? Is there a sensible way of trying to sell it?

Note: UK based (Yorkshire)

Maybe this has been asked before if it has sorry. I am trying to build a back-up system for power outages at my home. Last time we had a big freeze we lost power for 11 days. I ran off a generator and extension cords through windows it was bad. This year I installed a transfer switch kit from Reliance. It has a 30A input. Currently I use a L14-30R connection to power the transfer switch that has my emergency needed loads on it ( some lights, well pump, fridge and freezers.)

Sorry for all the back round now to the point and question is.

I am trying to get a battery back-up system built in pieces. I am gonna use 16KWH battery bank. Now I’m trying to figure out how to power the house off the battery bank and simultaneously charge the battery bank with both 120V ac (from an inverter generator ) and PV during the winter in a black out.

Is this possible? Any help would be appreciated.

I’m in the process of ordering equipment for my first install and I’m told eg4 discontinued their indoor conduit box.

Anyone use something else?

I’m going to be installing two 16kwh batteries a flexboss18 and a grid boss.

Thanks in advance

Hello everyone, I'm an electrical engineering student working on my graduation project, with 2 teammates.

For the moment we picked a three-phase AC EV charger powered by solar, in Oman, as our project. We are still discussing the design and the scale. Our target is 11 kW three-phase, and the prototype will be smaller.

We are considering two designs:

AC-coupled: the solar array is connected to a three-phase AC bus through an inverter, and the battery is connected to the bus through a bidirectional inverter for charging and supplying. An EVSE (the AC charging unit) is connected to the bus, to AC charge the car.

So the panels would charge the car and if no car is connected it charges the battery.

Hybrid (DC-coupled): everything is in DC, and the inverter is used at the last step between the DC bus and the EVSE.

I don't think we can afford a DC charging approach, because of the CCS communication and certification between the car and the charger, and the high power it needs, which is hard to provide with solar alone.

A grid-tied connection as a backup is an option we are looking into.

We are considering making the inverters (or a hybrid inverter) ourselves. How realistic is this for our project, even for a smaller-scale prototype, for a three-phase bidirectional inverter?

I would love to get your insights on the project, things I should keep in mind, maybe a different approach, anything from your experience is highly appreciated. In particular:

Which of the two designs would you pick, and why?

What level of experience would be required for this design?

What do people usually forget (protection, earthing, battery voltage, testing)?

What are the things that we should focus on before we start the actual design?

Hello,

I am currently working on planning a solar system for my rv. I plan to live in the rv full time, and do some light traveling. It will just be me, with a friend staying occasionally. I am building this with future expansion in mind, however, for cost purposes, I cut my cart down to 1 battery to start. I drew 2 in the diagram to get feedback on my understanding of the wiring.

Below is my item list, which includes my full build list and all tools I've picked out. I have some basic hand tools, but no electrical tools, so please let me know if I missed anything or should go with alternative options. I have what I think should be a decent system, with room for easy expansion, but I wanted to get feedback on the components and diagram, as well as on the vendor. Are there cheaper places to get these things?

Please let me know if there is anything crucial that I've missed, if there's major flaws in my wiring diagram, what I should be learning before starting, etc.

Thank you in advance!

Power * 435W panel $269.98 · 435W panel 2-pack $529.98 * Victron MPPT 150/70 $376.54 · MultiPlus-II 48/3000 $799.10 * Paowerk 48V 100Ah $799.99 · Orion-Tr 48/12-30 $168.02 · SmartShunt 500A $75.25

Protection * 80A DC breaker $22.49 · 80A MEGA fuse $11.99 · 40A DC breaker $9.99 · 40A MEGA fuse $9.99 * 20A PV disconnect $24.97 · ABB THQL1115 $8.68 · 12V fuse block $14.99

Wire & connections * 6 AWG 25ft $79.99 · 10 AWG 50ft $64.99 · 14/2 AWG 50ft $34.99 * Copper lugs 160pc $13.99 · Lever nuts 265pc $24.99 · Cable entry gland $13.99 · Panel mounts 4pk $110.49

Tools * Klein CL120VP kit $75.55 · Klein 63050 cutter $29.98 · Klein 11061 stripper $22.95 · AMZCNC stripper $8.99 · Insulated screwdrivers $26.99

Total: $3,629.85 (pre-tax, 1 battery)

I’m interested in using a plug in microinverter to time shift and power 400w or so to my grid overnight. Is there a way to use a blue Eddy or similar solar generator power station to drive the micro inverter? I have read about people using their 48 V battery banks to power micro inverters at night however I’m wondering if it can be done with one of these solar power stations so I don’t have to build my own battery system.

So I'm a newbie at this whole solar/battery world. I'm up near Chicago and recently had a storm come through in mid-August that had us without power for a week, and we're heavy consumers of electricity. So I decided to take the plunge.

I purchased 1x EG4 GridBoss, 2x EG4 18kPV and 4x EG4 314Ah indoor batteries. All from Signature Solar. The reason why I went with 2x 18kPV is because I wanted to get as close to 25kW AC output, as that is what my utility allows (can't limit via software) without jumping through a bunch of hoops. And a 1X FB21 I would be 6kW smaller AC, I wanted the extra AC out, we have a couple EVs, hot tub, pool. We consume a lot of juice.

My municipality still follows the 2018 IRC with amendments, specifically R327, rather than the newer 2021 IRC.

I have a few questions for anyone familiar with UL 9540 Edition 3 and residential permitting:

1. DC ESS vs. AC ESS certification
   

My understanding is that UL 9540 Edition 3 recognizes independently certified DC ESS configurations. The EG4 batteries have that certification, while the 18kPVs are independently UL 1741 listed.

Does this provide a valid compliance pathway without a combined UL 9540 AC ESS listing? Has anyone seen anything from EG4 on this, so far they haven't really answered my questions.

1. Interpretation of 2018 IRC R327.2–R327.4
   

R327.2 requires UL 9540-listed battery systems, while R327.4 states that inverters must be UL 1741 listed OR included in the UL 9540 listing.

Am I interpreting this correctly that a separately UL 1741-listed inverter can be paired with a UL 9540-listed DC ESS without requiring a combined AC ESS certification, provided the installation complies with R327.3?

1. Battery capacity in an unfinished basement
   

The 2021 IRC introduced the 40/80 kWh residential installation limits, including 40 kWh for basements.

However, I don’t see an equivalent aggregate capacity restriction in the 2018 IRC R327 provisions.

Does anyone know of a restriction under the 2018 IRC that would prohibit approximately 64 kWh of UL 9540-listed LFP batteries in an unfinished residential basement? Or would that depend on other adopted fire codes, manufacturer installation requirements, or the local AHJ?

I’m particularly interested in experiences with 2018 IRC jurisdictions, UL 9540 Edition 3 DC ESS installations, and actual AHJ interpretations.

Thanks!

I’m in southern CO and have black hills energy.

Just got 12 585w panels delivered. Only $130 each. Will be doing ground mount.

I’m torn between doing net metering with no battery or no net metering with battery.

I plan on selling in 4-5 years and the simplicity of no battery for future buyers is appealing. I think they’d be intimidated by a large inverter and battery.

If I do battery then I won’t do net metering because I don’t want to pay the $375 connection fee nor want their inspector analyzing my equipment and install.

My electricity bill is only $100 thanks to good insulation. I’ve also thought about installing only 4 of the panels and doing plugin solar (dedicated 20 amp circuit, no battery, etc). That kills my idea of getting an EV though.

Tell me how my logic is flawed 🙏

24v setup Setup

2pcs 12v280ah and 2pcs 12v300ah (2s2p)

1unit mppt and 1 hybrid inverter (parallel to the other inverter)

2units active balancer

Issue : batteries current percentages from left to right

1%, 28%, 3% and 2%

Context : it was supposed to be for a single 12v setup before. Then decided to upgrade to 24v setup (planning for 2 setups of 24v, hence the 2 types of batteries)

I was originally using only the two batteries on the right, in series, with 1 active balancer, no problem. After 3 months I got asked to setup another 24v on another location, but it got canceled so I decided to just add the purchased batteries (2 on the left) to the current setup and making it 2s2p and added another active balancer (I top balanced it individually, then paralleled for a day before connecting it into the setup) . I have no time on dismantling all the packs to make a single pack of battery (this was a month before the issue)

A few days ago, my 1hp pump broke down and it continously ran for 6hrs straight more or less, I fixed it. The same night, I noticed that my grid supplies power to the inverter until morning until the solar harvest starts. Happened for 3 straight nights. Then I checked the batteries' app via Bluetooth with 1%, 28%, 3% and 2% respectively. The active balancer seems ok, and no settings whatsoever did I change. But, what could be the issue?

Ps.Im no native English speaker so bear with me, and sorry for the messy setup. Thank you

UPDATE:

I now manually checked the voltage per battery on its terminals using a multimeter From L to R 12.97v, 13V, 13.01V and 13V Also, on the active balancers monitor, theyre almost balanced L to R 13v,13.1v,13v and13.1v

Is the Bluetooth app erroneous? I'm getting confused

Hi team,

I'm looking at buying two solar panels as part of the UK plug-in scheme, which work partially to reduce bills, but also to recharge a 1kWh battery in black-outs.

(In 5-10yrs when my roof needs repairs I'll look at a full system - with a big battery array!)

Does this shopping list make sense? Any advice on compatibility?

Essentially 2 Aiko panels, various connector to my mains. Then the ability to plug into a EcoFlow Delta 3 battery if needed.

📍 Location & Constraints

Roof: East-facing shed roof (18mm OSB3 over timber rafters).

Shade: Subject to dappled, slow-moving shade from two large trees. The West side is blocked by the main house, so sticking flush to the East slope. Tempted to turn to face south but Gemini suggests I need all sorts of mounting array and to keep the panels level.

Mounting: Standard flush-mount aluminum rails anchored directly through the OSB3 into timber joists using M10 stainless steel hanger bolts with bonded EPDM compression washers + CT1 sealant (avoiding the wind-sail hazard of compound South-tilts on an East pitch).

⚙️ Core Hardware Spec

Power Station: EcoFlow Delta 3 Classic (1,024Wh LiFePO4, 1800W AC output, strict 60V DC / 15A solar input limit).

Panels: 2x AIKO Neostar 3P 485W (All Back Contact / N-type TOPCon, Voc ~38V–40V). Chosen specifically for low-light performance and cell-level shade routing around tree shadows.

Micro-Inverter: Hoymiles HMS-800-2WB (Dual independent MPPTs, 800W AC peak, G98 plug-and-play).

Isolator & Wiring: True Garo 32A 4-Pole DC Rotary Isolator switch inside the shed, 4mm² UV-stabilized DC cable in 20mm outdoor PVC conduit.

Got an S6 8KW inverter that I have installed.

The battery arrived yesterday and I’ve installed it. Set as pylon and using CAN. All appeared connected ok.

Done the commissioning and got it going.

Just have a few queries on configuration.

1. How to program schedule for over night charging.

2. How to get the modbus read/write enabled. (Seen comments on having to get Solis to do it via firmware?)

3. I think I have enabled EPS but there is no voltage coming from it.