Solar batteries
ฝัง
- เผยแพร่เมื่อ 6 ต.ค. 2022
- Adding batteries to a house with solar (AC Coupling) or connecting batteries and panels to a hybrid inverter (DC Coupling), I explain the concepts, products and prices.
Note: Thanks for the suggestions from the earlier version of this video that is now deleted and replaced with this one. - วิทยาศาสตร์และเทคโนโลยี
Excellent video, thank you. The 200% over-sizing with a DC coupled battery is very attractive.
As always, Great video giving knowledge rather than pushng sales. Thanks
Great explainer, Andrew, thanks.
We're still delighted with the panels and Goodwe hybrid inverter you installed on our home, waiting for news on price drops for batteries.
I've recently retired and bought a BYD minivan, would love to put some high voltage BYD batteries in the garage to keep it company.
Hi Steve.
2022 has seen battery prices going in the wrong direction but hopefully next year will see things revert back at least to where they were before. Happy retirement !!
Loving your work Andrew, Wish you could be posting more blogs and videos haha.
brilliant
Hi Andrew, just watched your movie, very educational and well explained.
I do have a question about your sample of the two Huawei inverterters connected to one Huawei battery.
Could ypu pls explain me how to connect two inverters to one batterie?
If there's only one battery, it is plugged into the 'Master' inverter and receives it's charge from the panels connected to the Master inverter. However, if the Slave has surplus power, the Master can use that surplus power to charge the battery.
How it does that can be a little baffling to some people, but here goes...
The surplus power from the Slave is detected by the consumption meter connected to the Master. This power is measured as it flows to the electricity meter. The Master simultaneously draws an equal amount of power from the grid to charge the battery.
The electricity 'net' meter cancels out the export of the Slave and the import of the Master. In actual fact it is a bit more complex that that because this can still work even if the system is export limited so that in theory there would be no 'surplus' from the Slave as the Master can 'allow' the Slave to produce more power than the 'export limit' simply so it can do this power exchange.
By the way, the practice of 'exchanging power with the grid' as described above is actually very mundane. Three phase inverters, with or without a battery, are doing it all the time.
Hi Andrew, can you claim STC's for oversizing solar PV capacity i.e. 10kW on a 5kW Inverter, or are STC's limited to the 133% oversize?
Also is say a 10kW PV (200%) oversizing allowed by Synergy/WP in WA & STC rebateable on a non-hybrid inverter (e.g. Goodwe 5000-MS), or only on a hybrid inverter w a DC-coupled battery connected?
(NB: Single Phase)
If only hybrid w DC battery, is there a minimum battery size, and is the feed-in power capped/limited in any way in relation to battery size?
My current thinking/preference would be to AC couple a battery later to a std 5kW inverter, to minimise cost, but oversize the solar PV now to get STC's for the maximum no of panels I could install... if this is possible?
With the above scenarios, will any make the system ineligible for the DEBS feed-in in WA?
Hi,
Q1. STCs are limited to 133% oversize unless you connect a battery, in which case STCs are paid on whatever the manufacturer allows. e.g. Huawei, Sungrow, Growatt, say as long as the open circuit voltage of the string is under 600V d.c. then you can oversize to what you like. We've put 12kW of JinKo 475W panels on a 5kW inverter with STCs paid. It just depends on the electrical specifications of the panel.
Q.2 Western Power and happy with it with a hybrid and battery, but not sure about a regular inverter with no battery. Can't see why not though if you are prepared to forgo STCs and manufacturer warranty.
Q.3 The minimum battery size will be determined by the inverter. For instance Huawei say 5kWh minimum, Sungrow 9.6kWh minimum but Growatt is just 2.5kWh minimum with some of their hybrids.
Q.4 DEBs is paid on inverter capacity. Over 5kW, no DEBs.
Missed your Q about AC coupling. Firstly, you don't AC Couple a battery to a standard inverter, you buy another inverter and that runs the battery. It's often quite hard to see this extra inverter because it's often inside the battery cabinet. Tesla Powerwall 2, Alpha Smile B3, Sonnen batterie, all have inverters inside the box. Alternatively there are specific battery inverters from Goodwe and Growatt that can be used to run the battery, and outside of WA people on single phase can use hybrid inverters as their battery inverter too. We can't.
Anyway, you can't oversize a regular inverter beyond 133% if you want to claim any STCs. If you connect a battery, AC or DC coupled then you can, BUT, it's completely pointless doing a big oversize with an AC coupled battery because the inverter isn't charging the battery directly, so it's going to throttle what it pulls from the panels to it's maximum AC output..e.g. 5kW.
@@solar4ever843 Thanks Andrew, got it ;)
Seems like oversized w DC coupled battery will work best... left of field question - can you install a hybrid inverter w battery but no solar, if you haven't already got solar, and add the solar later and claim the STCs then? Would hybrid inverters support this?
@@jonathandavis3090 Installing a hybrid with battery with no solar make sit an AC coupled battery which is fine. Adding panels later is all a matter of how quickly the Huawei inverters drop off the CEC approved list. Most manufacturers release new models every three to four years, and when the new model comes they are less inclined to pay CEC fees for ongoing registration of old models. For example, the 2018/2019 Huawei 'L' and 'M0" hybrids are no longer "approved" so no STCs are payable on extra panels on them, and I'm sure that by 2025 there will be new Huawei inverters with all sorts of new goodies and the current models will drop off within a year or two.
Maybe you can help with this, I'm in the US and cannot log in to any monitor site so I installed NetEco1000 to run my own server but the software will not let me log in or create a new user. The manuals do not list a default Name and password and the online support has not responded to my request for a name and password.
Hi,
On our side of the World NetEco was closed some years ago and replaced by Fusionsolar. I also understand that politics have made things very tricky for USA and Huawei. There is a USA Huawei user who really knows his stuff and posts on Whirlpool Greentech forum. forums.whirlpool.net.au/forum/143?g=371
His user name there is 'basking in the sun' , forums.whirlpool.net.au/user/856152
Alternatively there is Huawei's own forum
forum.huawei.com/enterprise/en/Digital-Power/forum/100027
There is also a worldwide support centre, 24x7 based in Romania which WE can access with an Australian phone number, but I don't know how you can reach them from the USA.
If none of the above helps, let me know and I'll reach out to our Huawei Australian support team.
Andrew
@@solar4ever843 I found him, he had the same issues so he wrote a Pi program to use modbus and I'm following in his footsteps.
@@gregalot200 That's great news.
You missed 1 important point the off grid mode or battery mode is single phase.
That depends on the inverter. Some three phase inverters provide backup across all three phases whereas others deliver backup only on one phase. Personally, for small 3 phase inverters (e.g. 5kW/6kW) I think backup delivered to one phase only makes a lot of sense, but for larger 10/15/25kW inverters full three phase backup is better. It's all to do with how three phase inverters evenly split their power output across the phases.