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Author Topic: Mixing Lithium and Lead  (Read 7790 times)
Nickel2
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« Reply #15 on: March 06, 2018, 07:03:44 PM »

I'm starting to develop lithium envy! genuflect
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1.140kW mono south-facing at 49*
EpEver 4210A at 24v
New (Old) 8S7P LiFe battery, 105Ah @ 26.4V
EpEver STI1000-24-230 pure sine inverter
Of course it'll work. (It hasn't caught fire yet).
nowty
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« Reply #16 on: March 11, 2018, 04:44:13 PM »

My voltage sensing relay finally arrived from China.

Its now installed so I have set the Sunny Island back to Lead Acid charging voltages and can happily leave it unattended.

« Last Edit: April 21, 2018, 06:36:15 PM by nowty » Logged

12kW+ of PV installed and 60+ MWh's generated.
Home battery storage of 40+ kWh's.
Hot water storage of 15+ kWh's.
Heat storage of 15+ kWh's.
6kW Ground source heatpump.
EV BMW i3 (another 30+ kWh's of storage).
290,000+ litres of water harvested from underground river.
peterboat
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« Reply #17 on: March 11, 2018, 05:48:40 PM »

My voltage sensing relay finally arrived from China.

Its now installed so I have set the Sunny Back to Lead Acid charging voltages and can happily leave it unattended.


This is what I am doing with my Valence batteries could you provide links for the voltage sensing relay and the heavy duty disconnect please as long as you are happy with the quality and operation that is
Peter
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biff
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« Reply #18 on: March 11, 2018, 06:23:31 PM »

Great thread Nowty,
        I wonder to they do the 120v version,?  Must have a look and see if i can find a similar set up, At least I know what it looks like now, fingers crossed!
                                                                          Biff
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nowty
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« Reply #19 on: March 11, 2018, 06:43:02 PM »

This is what I am doing with my Valence batteries could you provide links for the voltage sensing relay and the heavy duty disconnect please as long as you are happy with the quality and operation that is
Peter

Yes I am happy with it, I tested the DC relay at 80amps and it did not even spark. I tested the voltage sensing relay with a variable power supply and it works as I want it to.

Voltage sensing relay,
https://www.ebay.co.uk/itm/DVM-A-DC24V-DC-over-voltage-protection-relay/232540318361?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649

I also bought one of these (digital version of a voltage sensing relay) as an alternative,
https://www.ebay.co.uk/itm/Battery-Charge-Discharge-Board-Under-Over-Voltage-Protection-Module-DC-6-40V-DE/322885829605?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649

Heavy Duty (normally closed) DC Relay
https://www.intellitecmv.com/collections/relays/products/relay-spst-normally-closed-24v-150a
« Last Edit: March 11, 2018, 06:47:25 PM by nowty » Logged

12kW+ of PV installed and 60+ MWh's generated.
Home battery storage of 40+ kWh's.
Hot water storage of 15+ kWh's.
Heat storage of 15+ kWh's.
6kW Ground source heatpump.
EV BMW i3 (another 30+ kWh's of storage).
290,000+ litres of water harvested from underground river.
Tinbum
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« Reply #20 on: March 11, 2018, 10:50:11 PM »

Cheaper here;
https://www.aliexpress.com/item/1X-Free-Shipping-DVM-A-DC-Over-Voltage-and-Under-Voltage-Protection-Relay-With-Socket/1074413909.html?ws_ab_test=searchweb0_0,searchweb201602_5_10152_10151_10065_10344_10130_10068_10324_10342_10547_10325_10343_10340_10548_10341_10192_10190_10084_10083_10618_10307_10301_10303_10313_10059_10184_10534_100031_10103_10627_10626_10624_10623_10622_10621_10620,searchweb201603_25,ppcSwitch_5&algo_expid=d12c7025-daba-47bc-b2b1-69d6d04049c1-0&algo_pvid=d12c7025-daba-47bc-b2b1-69d6d04049c1&priceBeautifyAB=0

Biff they only seem to do the 4 different voltages.
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85no 58mm solar thermal tubes, 28.5Kw PV, 3 x Sunny Backup 5048, 3x Sunny Island 5048, 2795 Ah (135kWh) (c20) Rolls batteries 48v, Atmos wood gasification boiler, Brosley wood burner, 2000lt buffer tank and 250lt DHW
nowty
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« Reply #21 on: March 12, 2018, 10:30:08 AM »

And another slightly more compact version made by the same company.

https://www.aliexpress.com/store/product/DVRD-DC-Over-and-Under-Voltage-Relay/1916063_32826508821.html?spm=2114.10010108.1000023.1.4aadba4d0aaQDh

http://en.ginri.com/products-mpid28.html
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12kW+ of PV installed and 60+ MWh's generated.
Home battery storage of 40+ kWh's.
Hot water storage of 15+ kWh's.
Heat storage of 15+ kWh's.
6kW Ground source heatpump.
EV BMW i3 (another 30+ kWh's of storage).
290,000+ litres of water harvested from underground river.
nowty
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« Reply #22 on: March 22, 2018, 11:23:46 AM »

Installed fused links to interconnect all the cell modules and I can confirm that the DC breaker and voltage sensing relay are working in real life conditions.

I was hoping for the increased capacity to give me two days autonomy as we rarely get more than two consecutive poor solar days between mid Feb to end of Oct. But after being fully charged I managed to get through three really poor days with the recent snow. And just two more good days to fully charge again.

I seem to have around 20 kWh’s of real life useable storage which is a great increase from 5kWh’s just relying on the lead acid.


« Last Edit: April 21, 2018, 06:36:50 PM by nowty » Logged

12kW+ of PV installed and 60+ MWh's generated.
Home battery storage of 40+ kWh's.
Hot water storage of 15+ kWh's.
Heat storage of 15+ kWh's.
6kW Ground source heatpump.
EV BMW i3 (another 30+ kWh's of storage).
290,000+ litres of water harvested from underground river.
knighty
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« Reply #23 on: March 22, 2018, 01:43:34 PM »

that's looking really good/tidy - nice job there :-)


it's nice to see LiIon available for DIY stuff without costing megabucks - hopefully it's a sign of good things to come


I'm not 100% sure I'm right... but I think even a half knackered liion pack is still just as efficient as a brand new one - it just has less capacity?
(where lead acid has higher standing/charing losses etc. ?)
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nowty
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« Reply #24 on: March 22, 2018, 05:28:09 PM »

I'm not 100% sure I'm right... but I think even a half knackered liion pack is still just as efficient as a brand new one - it just has less capacity?
(where lead acid has higher standing/charing losses etc. ?)

Yeah, I think thats right.

I have noticed that as my lead pack is now only slightly charging / discharging compared with the lithium pack, its temperature has dropped to almost ambient.

The lead used to run nearly 10 degrees hotter which just shows the inefficiency of them.
« Last Edit: March 22, 2018, 06:32:40 PM by nowty » Logged

12kW+ of PV installed and 60+ MWh's generated.
Home battery storage of 40+ kWh's.
Hot water storage of 15+ kWh's.
Heat storage of 15+ kWh's.
6kW Ground source heatpump.
EV BMW i3 (another 30+ kWh's of storage).
290,000+ litres of water harvested from underground river.
nowty
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« Reply #25 on: April 21, 2018, 06:58:53 PM »

Latest and probably my last update on this project, not likely to be any more changes now.
Its working as well as I could have expected, very happy with it. fingers crossed!


Added permanent voltage displays on each parallel cell so I don't have to use my multimeter any more and can see immediately if there is any voltage imbalance. tumble



Added permanent charging current meter and voltage meters for both Lead and Lithium batteries. ballspin



Final Picture ralph
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12kW+ of PV installed and 60+ MWh's generated.
Home battery storage of 40+ kWh's.
Hot water storage of 15+ kWh's.
Heat storage of 15+ kWh's.
6kW Ground source heatpump.
EV BMW i3 (another 30+ kWh's of storage).
290,000+ litres of water harvested from underground river.
biff
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« Reply #26 on: April 21, 2018, 10:12:47 PM »

Dam,s impressive Nowty,
                      It is a lovely set up.
                                       Biff
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An unpaid Navitron volunteer,who has been living off-grid,powered by wind and solar,each year better than the last one.
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