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Inheriting a challenge



  • Registered Users Posts: 824 ✭✭✭HotSwap

    Just keep in mind that the battery won’t charge unless there is >3kwh generation and the eddi is not heating the water in this configuration.

  • Registered Users Posts: 5,858 ✭✭✭Chris_5339762

    Thats good to know. It'll have to be managed at the moment and I'll keep an eye on it, so hopefully it won't get to that stage at this time of year.

    Later in the year I'll prioritise the battery again once I know we can get that charged AND reliably do some hot water.

  • Registered Users Posts: 5,858 ✭✭✭Chris_5339762

    Update for those interested: The company had offered, very kindly, to put in an extra panel for us for free, as that can be coupled with the three on our side roof on one Inverter string, with our eight other panels on the second string. Its only a 3kW inverter and will have 4.5kW of panels attached to it, so I know we're bottlenecked there a bit.

    Installed happily yesterday. But, the installers had problems, as both strings were generating a voltage but not a current. So they need an electrician. No electricians available until next Tuesday, even in an emergency. They can't put the system back to how it was either - with 8+3 all on the one string and the new panel just disconnected, without an electrician.

    So entire system switched off until next week. A bit frustrating, but all the installers and electricians are just so busy at the moment.

  • Registered Users Posts: 6,079 ✭✭✭championc

    If they were making two strings, then the 8 string should have been fine.

    Was it too dim to maybe start the inverter up ? It might be worth turning it on if the sun hits the 8 panel array

    It's possible too that the current gradually builds. It doesn't just go boom and straight to generating 1kW or whatever

  • Registered Users Posts: 5,858 ✭✭✭Chris_5339762

    I dunno what they were up to... the funny thing is it is now trickle charging the battery, so something is on! But nothing coming into the house.

    The sun was out and firing in 2kW+ on the day, so I'm not sure. Maybe they didn't wait long enough but unfortunately we'll have to wait until Tuesday at the earliest to find out.

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  • Moderators, Science, Health & Environment Moderators Posts: 4,689 Mod ✭✭✭✭Tree

    Can you log into the inverter directly and see the output/status? That's usually up to date even when fusionsolar is down.

    Me> Commision Device> (make sure you're on the SUN wifi)> Log in (user + the password you have for the inverter).

  • Registered Users Posts: 5,858 ✭✭✭Chris_5339762

    Oh whoops, I realised I never updated this thread.

    Everything is going well with the solar, and it is performing FAR better than expected.

    To recap:

    • March 2022 8x panels and 3kW Huawei Sun2000 inverter installed. Various problems with voltage solved by chance (big explosion at a substation) and by a transformer replacement
    • November 2022 3x more panels installed and a 5kW Luna battery installed. Problems accessing FusionHome app to set the battery to charge at night
    • January 2022 FusionHome still doesn't work - can't log in, but company told us how to do all this stuff through FusionSolar, so battery charged most nights and monitored manually to prioritise hot water or to charge battery. With my weather forecasting knowledge I have been right about 80% of the time as to whether to charge the battery overnight or not, and what to prioritise. It's not quite as automatic as it could be.
    • February 2022 As a "sorry" the company gave us 1x extra panel free, for a total of 12. These are split into two strings, the old 8 and the new 4.

    The system is working brilliantly. I believed, and was told, that our 3kW inverter would only ever generate 3kW of electricity. I had seen it clip when we only had 8 panels at about 3.3kW which seemed reasonable, but after putting them onto two strings of 8 and 4, the highest I've seen it go so far is just over 5kW - and given that that number is rising as the seasons go on I think it'll go higher. We haven't had a perfectly sunny day since November to test it properly, but it does seem to clip back to 3.3kW later in the day. 5kW of power gives 2.5kW to the battery and 2.5kW to the hot water, its brilliant.

    Energia have sorted our deemed FIT at long last - sadly based on a 3kW deemed maximum, but oh well. We use every scrap of power at the moment - into the battery, hot water, and the second Eddi output is going to be used to power two "dumb" heaters in parallel in two different rooms.

    I'm aware we're probably pushing the inverter a bit too hard, but if it goes bang, they offered us the extra panel so they can fix it, is my thinking.

    Does anyone know how high the Sun2000 will ACTUALLY go? What will cause it to clip to 3.3kW, is it overheating, at which point it restricts things somehow, or is there more going on there? (And of course will this cause problems or shorten the life of anything?)

  • Registered Users Posts: 554 ✭✭✭idc

    The libbi has two parts - the rebadged Kstar inverter+battery and a seperate MyEnergie controller unit. My guess is all the smarts is in the controller unit and inside the libbi is probably just a small unit connected via Modbus which communicates with the controller. Its just a pity they didn't make this a more general setup where they could team up with other inverters and do something similar

  • Registered Users Posts: 824 ✭✭✭HotSwap

    You can push up to 5kWh directly into the battery from the panels even from the 5kW inverter; it’s possible to do this because it’s a high voltage battery so it just takes the power from the panels direct to the battery; it’s not actually “inverting” this power.

    on top of this you could “invert” and output up to 3kwh AC power.

    you would be exceeding the 4.5kwp that huawei recommend to connect to this inverter. But as long as neither of your strings exceed 600v it’s ok .

    so the times you’ve seen PV yield above 3kwh it’s because you were charging the battery and powering your home / exporting to the grid

  • Registered Users Posts: 5,858 ✭✭✭Chris_5339762

    That explains things nicely. Turns out the FusionSolar display clips at 3.3kW at the exact time the battery finishes charging.

    Learnt a lot about batteries today, thanks!

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  • Registered Users Posts: 5,858 ✭✭✭Chris_5339762

    All going well in the land of our solar, however given that we're on a day/night meter (which I'm jealously guarding), the question has come up recently of what to do with any excess power.

    System puts 5kW into our battery, thats fine.

    Then it goes to Eddi.

    Eddi Heater 1 is set to the immersion, thats fine.

    Eddi Heater 2 is current going to a 700W storage heater in the bathroom. My dad is doing some of his trickery and is paralleling a second, dumb, oil fired heater onto this. He was an electrical engineer so although his work won't satisfy modern code, it's perfectly safe.

    My question is this - what other devices can be used with Eddi? Its got to be dumb, but what appliances are actually dumb? So far, an immersion, our 1950s oil fired heater and storage heaters are the only things we've thought of. A small water heater next to the kitchen sink is being considered, but what else is there?

  • Moderators, Sports Moderators Posts: 18,800 Mod ✭✭✭✭slave1

    They don't need to be dumb, they need to have a resistive element, not sure there's much after the elements that heat both water and blocks (storage heater).

    Bigger hot water cylinder?

    My stuff for sale on Adverts inc. outdoor furniture, roof box and EDDI

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  • Registered Users Posts: 2,468 ✭✭✭bullit_dodger

    If the auld fella is an ex-electrical engineer, DIY battery has to be surely on the cards then? I mean it's the ultimate storage place for excess. Eddi's and what not are great and all, but they really only heat water (mostly), but with say 12-15Kwhr of storage you could do whatever with it.

  • Registered Users Posts: 5,858 ✭✭✭Chris_5339762

    Possibly yes, but theres a cost to that, and he'd go for the cheapest Chinese ones he could find!

    Stuff like dehumidifiers etc were being considered but just about everything apart from the storage heaters (including hot water boilers etc) have a surprising amount of electronics with displays and timers and all that. Not terribly friendly to the variable current from an Eddi.

  • Registered Users Posts: 824 ✭✭✭HotSwap

    You can get a relay board for the eddi that allows you to interface with anything you can dream up. It also allows you to connect 2 temp probes into the eddi. Worth looking into.

    or you could use home assistant and trigger things like dehumidifiers via smart Wi-Fi plugs when your system detects export.

    mine some bitcoin :) another option.

    are you getting paid for export via the deemed export program?

  • Registered Users Posts: 5,858 ✭✭✭Chris_5339762

    Yeah we're finally getting Deemed Export - after a long battle with Energia. So that means we now need to use every single electron that we get moving down the cables.

    £45 for that relay board though, I think he's going to build his own. The latest thing he's done is buy some small circuits from China that he hooks onto various batteries to measure the voltage, and when it dips below a certain amount a little light comes on so he knows what needs charging.

  • Registered Users Posts: 5,858 ✭✭✭Chris_5339762

    This has all been going extremely well lately and no updates all all, but things haven't gone so well this weekend.

    One of my routers kicked off over the weekend, and I got the abnormal communication error on the FusionSolar app. A message was sent home and there was the obvious instruction to reset the router, which was duly done, but didn't make a difference as it turns out the inverter had connected to my wifi extender, which wasn't reset and had gotten stuck in a loop.

    The engineer who was phoned told my dad to go up into the loft and reset the inverter and the batter which he did, but things haven't worked since. The engineer was supposed to visit today, but of course cancelled and now no solar until Monday.

    Inverter (Huawei SUN2000-3KTL-L1) has two green lights on the front with the right hand wifi one flashing occasionally. It looks fine. But nothing is working, no voltage seen on either string and we're importing everything from the grid and the battery is not discharging. Everything is showing as connected and running but it looks like the inverter just isn't doing anything.

    FusionSolar looks like the attached. Anything quick and easy I can try tomorrow or Sunday before the engineer comes?