Green Building Bible, Fourth Edition |
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Posted By: jamesingramRenewable John. I presume A 3 phase hybrid inverter will do the job. <16A per phase will allow you a 10kW 3ph inverter without doing a g99 preregistration.
Posted By: renewablejohnDon't think so. e.g. http://www.windandsun.co.uk/information/solutions/on-grid-solar-pv-battery-storage-solutions/solaredge-3-phase-storedge%E2%84%A2-battery-storage-system.aspx or search for 3 phase hybrid inverterPosted By: jamesingramRenewable John. I presume A 3 phase hybrid inverter will do the job. <16A per phase will allow you a 10kW 3ph inverter without doing a g99 preregistration.
I presume it requires a battery bank per phase.
Posted By: WillInAberdeenThe problem with all energy storage projects is that, to get your money's worth, you need to fill and empty it many times, such as several times per week. If you store up 100s of kWh of summer PV for winter heating then the battery will only be cycled once per year, which is not good value. You need to trade off to find the best size of storage to match your needs.Exactly. That's why I ended up with a 250 L thermal store for DHW heated by solar PV rather than a 20,000 L ex-milk tank heated by solar thermal for space heating.
Posted By: WillInAberdeenDepends how much PV you want to store, IE what are you planning to do with it?
The proposed 16.5 kW array with 3x3.6 kW inverter will only generate that much during daytime in the summer, when you likely won't have sustained uses for so much power? How many kWh are you likely to consume overnight, to empty the battery ready to receive more charge the next day, and are you ok to import that power when it's not sunny, maybe at cheaper off-peak prices?
A 40kWh EV with a domestic charger would prefer to charge at about 4-7kW, so you would be exporting most of the 16.5kW PV? That battery would last for several days of average home consumption or driving.
The problem with all energy storage projects is that, to get your money's worth, you need to fill and empty it many times, such as several times per week. If you store up 100s of kWh of summer PV for winter heating then the battery will only be cycled once per year, which is not good value. You need to trade off to find the best size of storage to match your needs.
AIUI if you have several inverters (such as a PV inverter and a V2H charger) the G99 notification is based on the combined power of all the inverters. There aren't many V2H chargers on the market yet afaict.
Is the 16.5kW PV all going to be oriented the same direction, or can you have different strings pointing east/west/up/down, so you get less power but spread more evenly over the day and year?
Posted By: Pile-o-StoneWould it be possible to ground mount the solar panels? Perhaps instead of the shed if the solar generation is more important than a workshop/tool store.
You could then either angle the panels permanently for winter generation or have a way to adjust the angle a few times a year for maximum efficiency in each of the seasons.
Posted By: renewablejohn
... but that will change if I get a Nissan leaf as a cheap storage battery (24kwh) and V2H connection. In winter I also have 700w hydro 24/7 which could go into batteries or direct into the UFH.
Posted By: neelpeelPosted By: renewablejohn
... but that will change if I get a Nissan leaf as a cheap storage battery (24kwh) and V2H connection. In winter I also have 700w hydro 24/7 which could go into batteries or direct into the UFH.
Interesting. I thought it was just the newer (40kW+) Leafs that you could use for V2H. Or is that just V2G?
Posted By: philedgeIf youre charging batteries surely you want to maximise overall production and have the whole array facing south??
AIUI you only have a spread of orientation if theres no storage and you accept lower overall production in return for a longer period of useable generation???
Posted By: philedgeTheres a few regular sellers of second hand panels on ebay but almost always sub 250watt. I bought a few NOS job lots at the beginning of the year but that sort of thing has vanished and most multi panel sales are near new prices!! Cheapest place Im seeing new panels is solarsparky so good for a benchmark price.
Posted By: renewablejohn
But you loose a lot of power charging batteries so was only looking to put the excess into the batteries. With bifacial panels I expect E,W, orientation to probably produce more than S with silver foil covering on ground under panels.
Posted By: philedgePosted By: renewablejohn
But you loose a lot of power charging batteries so was only looking to put the excess into the batteries. With bifacial panels I expect E,W, orientation to probably produce more than S with silver foil covering on ground under panels.
Id assumed battery charging was the priority as previous post said excess generation was going to briquette and pellet production??????
Posted By: neelpeel
So what technologies should I be looking for in a panel? Do I need to spend the next 3 weeks Googling!?
Any brands / tech to avoid? Or good impartial websites?
Posted By: renewablejohn
I see the peak production only being summer time which fits in well with the pellet and briquette production. Rest of the year I think it will be a struggle to both generate enough from solar for a home and car.
Posted By: neelpeelAlso, my plan was to mount the inverter and any other gubbins on a panel inside the 'shed'. This is 30m from the house consumer unit. Any issues foreseen with this?