Avoid My Solar Battery Blunder 🤦‍♂️

After Gary had his SunSynk 3.6kW hybrid inverter and 5.32kWh battery installed he quickly found out he needed more storage. In this video Gary and Sean Scanlan from SSES Ltd explain why a second SunSynk 5.32kWh battery was needed and the benefits of having a second one.

Gary does solar with Sean

Learn about the Sunsynk Inverter

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00:00 Why I needed a second battery
00:25 Household use 10kWh per day
00:40 Installed in 10 minutes
01:01 The install process
02:09 Communication lead
02:26 Discharge 80%
02:56 Discharge more energy
03:12 It just worked
03:50 2 batteries will power the house overnight
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#renewableenergy #energyefficiency #efixxenergy #solarbattery #solarpv

[sergiofernandez]

Would you class your plant room as a Special location?

[massimookissed]

I dunno what building regs allow you to put that equipment right next to a toilet.

[dannytech]

Wow bathroom battery installation is the new best thing. 😂 great Idea ❤there is no time to waste have to monitor these battery at all times 🎉

[JamesScholesUK]

Of course the downside of a hybrid inverter is that Gary's statement "I've got the 3.6kw draw from the inverter, plus the solar" is unfortunately not true. The maximum throughput of the inverter is 3.68kw, and if the sun is shining it'll max out and won't draw from the batteries. However it does look like your usage and draw will match up better now, so you'll just have to be a bit careful about drying tgose flowing locks when the kettle's on!

[Pete-whrl]

Hi

How long does the battery take to charge over night using SEG, all night or couple of hours please

[Umski]

Please stop saying kW when you mean kWh - set an example to those that may not know any better 🙄

[dannytech]

I hope wend the toilet discharges doesn’t discharge the batteries Too 😮

[Electronzap]

Power and power consumption seem to be the most confusing topics for people interested in learning about energy storage.

[VinoVeritas_]

That's a really poor Depth of Discharge. Paying for a 5.32kWh battery, but only being able to use 4.25kWh is a scam.

[maximc]

Big Big mistake installing a complex electrical system in a toilet. What happens when a guest uses it and points in the wrong direction, not to mention the humidity?

[jigsey.]

Same I got 16 panels installed, with 5kw battery...I should have got another 5kw..

[MartynDuerden]

Afternoon Gary, *looks* like the Keto has a fuse in the Negative as-well as the positive which is a fire risk if the -ve blows first…

I cant see the ratings obviously but looks like a keto 160/3 and of course could just be a solid link?

A question for your installer maybe?

[junkerzn]

I would worry about humidity in the bathroom. Not the best place to put batteries or electronics.

In anycase, this particular battery vendor doesn't seem to know how their own batteries work. They don't even name the battery chemistry correctly. It is "Lithium Iron Phosphate", not "Lithium-ion Phosphate". The 80% DOD is garbage... that's marketing nonsense that just lets them inflate their cycle life. LiFePO4 batteries can be 95% discharged (roughly a 48.0V inverter cut-off) without causing any significant wear to the cells verses a shallow DOD. The cells will still outlast the rest of the electronics in the battery by years.

The BMS should be programmed cut-off at around 2.5V/cell to 2.75V/cell (40.0V to 44.0V). BMS cut-offs are always the last resort and shouldn't be used as the go-to low-voltage cut-off for the system. The inverter should be programmed to cut-off at around 3.0V/cell (48.0V), which is 95% discharged under a nominal load.

Always charge LiFePO4 to 100% when conditions allow. This is typically 3.55V/cell (56.8V), hold for between 30 minutes and 2 hours ("absorb setting"), and disable any current tail to allow the BMS sufficient time to balance the cells internally, then drop to a float of between 3.35V/cell and 3.375V/cell (53.6V to 54.0V) as long as solar conditions permit.

Load-support from the grid is usually programmed in between 52.0V and 53.0V. For voltage-based load-support it takes some messing around to dial-in a good number since it will depend on nominal system loads, but it is far more reliable than using SOC-based programming in control loops. Avoid SOC-based control loops... the BMS tracks the SOC but it is only reliable if the battery can regularly be charged to 100%. So it is possible for control loops to end-up in a tangle and cause the system to stop working properly when they are based on SOC.

In anycase, this is basically how you program in a battery reserve in case of a power outage. Typically you don't want to draw the battery down below roughly 30% of its capacity under normal operation when the grid is available, in order to ensure that you have at least 30% of the capacity available as a reserve if the grid fails at just the wrong time.

-Matt

[DTech]

I did say in the first video mate 😂 you can never have too much storage 😉

[gino]

People and sellers really push batterys. I have got a 5kw battery and in the supper it's great but that's because my system is returning solar all the time we have light sky's so say up to 9pm in summer and then we are off to bed say annhour after . This gives my batterys 6 to 7 hours of use powering the home. Because its summer the dishwasher and washing machines are onin the sunny period so no loads . So winter is very different. Be lucky to get 1 hour 30 minutes as we are up making coffee/tea, showering, cooking all coming from that poor old battery. For best performance you need an 8 kw solar array and 20kw of batterys to deal with a lived in family home. If its a retired couple then 10kw or less. Its all dependant on what you use and how you live day to day. Remember what ever you pay for your system and labour needs to be paid back before you an say its free lol. Lot of folks forget this when they tell everyone in the pub how they have free electric lol. Then you have to pray they don't fail until the warranty runs out as then it will be a few more years before it pays back.

[stereosteyn]

i think you could have made better use of your roof. and you could have asked your neighbor if you can creep into his roof as well, he might not have minded that

[MrButuz]

So let me get this straight building regs say you cant install a light switch inside a bathroom as that is apparently highly dangerous, yet you've installed a huge explosive water averse lithium bomb right next to a bunch of plumbing piping and water? and then put it on youtube for us all to learn from? Nothing like the humming of high voltage and certain death 3 inches from your ear when your taking a poop!

[Phoenix_Rse]

How long until we all move away from the terms Master & Slave ? Primary & Secondary much better.