Solar Inverter Sizing - DC to AC Ratios
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- čas přidán 6. 08. 2024
- This video addresses how to size a solar inverter AC output compared to a solar array DC output in several different scenarios.
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Very good video. Would be great if you can do more on microinverters such as install steps or components needed like dc/ac disconnect
Absolutely. I plan to do some more hands on videos in the future once the channel is up and running. Most microinverters have a combiner box with circuit breakers that are considered a code compliant AC disconnect per NEC guidelines, but many utilities have their own unique AC disconnect requirements.
Hi, great explanation, im about to buy a 6.9kw array on an East facing roof. I have been offered either a 5 or 7kw invertor for the same price. Which one would work better, i live in the UK so not especially a sunny climate. Im also having a 10kw battery if that impacts anything. Many thanks
Tough call. That is a 1.38 DC:AC ratio. You could certainly get away with a 5K inverter, but you will probably experience some clipping in the late morning in the sunniest months of the year. Thanks for watching!
Rated output Actual output. My system is rated at 2.1kW peak, but I never see that level of output from the system in my location. The highest I've seen it get to is about 1.7kW peak. I've got a 2kW inverter (grid-tie), so I'm thinking that I I can replace those old panels with an array that's at least 2.5kW peak. While it's possible that the output will be clipped sometimes, they will also be generating more power than a smaller array would be doing at other times, which should reduce the payback time. Now I just need to figure out what panels I should get to replace the existing 12-panel array ...
Absolutely. I will tell you, if you check out my Signature Solar affiliate link down in the description, they have the cheapest prices I have ever seen on the Canadian Solar panels. I went ahead and bought a pallet a few weeks ago. Good brand and all black modules. Couldn't beat it.
This is EXACTLY the size of my Solar Array - 7.6 kWh (19-400W RAE panels). I have a 7.0 kW SMA central Inverter (perhaps a little oversized, but I wanted to allow for adding some panels.) My system was installed without a battery (Grid-tied only.) I now want to add a battery to the system. My question is: How big a Battery should I install? I was hoping for a better technology (like Sodium-Ion), but it looks like Li-Ion (LFP) will continue to be the best, at least in my lifetime. I have 12 panels facing Southward, and 7 panels facing Westward. The first year I produced a little over 11,000 kWh of power. In 2022, I used about 10,600 kWh. In Texas, A/C takes up the majority of our power. My Heat and water heating are provided by gas (not my choice, but the systems were already in place when I bought the house.) I plan on adding a Battery in 2026. Again, what size would you recommend?
HI Bob! Thanks for reaching out. That really depends on the purpose of the battery bank and your individual home loads. There are 4 main questions to ask....
1. Are you only purchasing the batteries for backup power, or is the main purpose to cycle them daily to maximize your self consumption and avoid using the utility power? Usually if you get "net metering" you would only need the batteries for backup, while if the utility charges you more for power than they pay you for your exported power, you would maximize self consumption.
2. Do you want whole home backup or partial home backup? In either of these cases you will need to roughly know a list of any breakers exceeding 20A, and what they power.
3. Do you already have a specific battery picked out? Each battery is going to have a different "max continuous output current" and a different "peak output current" which will determine the individual load it can handle.
4. How long do you want to be able to run during an outage before your batteries drain out?
That A/C in Texas is no joke. Even once sizing the battery to meet the instantaneous power requirements, those things will drain your batteries down pretty quickly.
@@RockyBroadSolarLLC "Net Metering" is no longer available in Texas. The power Company charges me about 4X what they pay me for power exported to the grid. I am billed monthly for 200 - 500 kWh, but credited for about 500 kWh at the lower rate. I want to maximize my self consumption. Whole Home back-up would be nice, but I first want to use all the power I produce. We have NOT experienced any long outages here - even during the 02/2021 deep freeze. I can add a soft-start to my a/c system, but that is my biggest draw. I used 10,600 kWh in 2022. I am guessing I need a 15 - 20 kW battery. Am trying to hold out for Sodium-Ion or solid-state, but cannot wait past 2027. In that case, I will use LFP Li-Ion technology. Thanks for your extended comments. Do you have more with this new info?
@bobjohnson7280 So I took your 500kWh that you are credited per month at the lower rate, divided that by 30 days, which gave me roughly 16.66 kWh per day you are exporting to the grid. Assuming you would cycle your battery bank daily, If I were you, I would get a minimum of 20kWh battery bank. Some days will produce more than others, and usually you would want to leave at least 20% of the batteries for reserve in case of an outage, and I believe it will lengthen their lifespan by not draining them under 20% regularly. Now which loads in your home you will be able to back up is going to vary based on your AC coupled battery inverter, but a general rule of thumb is that most 10kWh battery banks can cover your 15-20A circuits, a 20kWh battery bank could cover breakers up to 40A, a 30kWh bank could cover breakers up to 60A, 40kWh up to 80A, etc.
I want to buy most of my parts from Signature Solar so I just need a good installer but everywhere I inquire they want to sell me panels and inverters that they furnish at much inflated cost to me. I live in San Antonio, TX. Here are the basics of what I want.
Sol -Ark 15K Hybrid inverter@ $6499
EG4 PowerPro Wall mount All Weather Lithium battery 48V 280Ah 14.3kWh LiFeP04 @$3799
19 Aptos 440W Bifacial Solar Panels (Black) @ $211 ea.
My roof is facing south with no obstructions at all.
What do you think. According to this video I would not need a 15kW inverter but this inverter allows me to install more panels later on my Garage.
You will be hard pressed to find an installer willing to install homeowner purchased/designed equipment. They generally make a mark up on the equipment. Most installers specialize in installing a narrow product offering in order to be efficient and able to provide service to the system in the future if something needs replacing and be able to design/permit everything. I am sure if you reach out to some local installers you might find one willing to work with you, but most will probably pass, or mark up the labor to make up for learning a new system and not making anything on the equipment.
@@RockyBroadSolarLLC Your right an I have changed my mind on the inverter. I am thinking of going with the Sol-Ark 15K as it is battery agnostic
@@RockyBroadSolarLLC Yes I realized that I would need a different hybrid inverter like the Sol-Ark 12K or 15K
your talking solar not the inverter that is doing the dc to ac
That is correct. I am talking the ratio of the DC solar panel array compared to the AC size of the solar inverter. Thanks for watching!