Author Topic: Battery banks for grid tie feedin  (Read 236 times)

russ_drinkwater

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Battery banks for grid tie feedin
« on: October 09, 2017, 07:20:30 AM »
I was speaking to an installer who does after installation/retro battery banks to grid tie systems.
The grid tie inverters draw from the battery banks after sundown and feed in when the tarriff payment is at
its peak. Ours is at 44 cents per kw.
Does anyone have any experience with these systems?
Apparently it does not void the original contract.
Standalone. 20 Hyundai x 220 watts panels, 2 x classic 150's, Latronics 24 volt 3kw inverter, Whiz bang Jnr, 12 Rolls surrete  4KS 25P  batteries and WBJ.
Grid tie feed-in, 12.5 kw in 3 arrays generating 50 kws per day average. Solar river grid tie inverters

russ_drinkwater

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Re: Battery banks for grid tie feedin
« Reply #1 on: October 16, 2017, 03:51:03 PM »
No-one???????????????????????????????
Standalone. 20 Hyundai x 220 watts panels, 2 x classic 150's, Latronics 24 volt 3kw inverter, Whiz bang Jnr, 12 Rolls surrete  4KS 25P  batteries and WBJ.
Grid tie feed-in, 12.5 kw in 3 arrays generating 50 kws per day average. Solar river grid tie inverters

ClassicCrazy

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Re: Battery banks for grid tie feedin
« Reply #2 on: October 18, 2017, 12:21:44 AM »
Seems like you would have to have a very large battery bank. And if you were drawing it down like to 50% or more than that  you would certainly decrease the longevity  of your battery life. So not sure if it would be worth the extra $$ you make selling power back compared to how much batteries cost.

Larry
system one
Classic 150 , 5s4p  Kyocera 135watt , 12s Soneil 2v 540amp lead crystal for 24v pack , Outback 3524 inverter
system two
Classic 150 ,5s 135 watt Kyocero , 16s Calb 100AH LiFePO4 , Outback VFX 3648 inverter
system three
Midnite KID MPPT 24 DC in to  12 volt AGM batterie

russ_drinkwater

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Re: Battery banks for grid tie feedin
« Reply #3 on: October 18, 2017, 01:21:46 AM »
I have the idea they are using tesla powerwalls for the plan.
Seemed like a financial gain for them and not a lot for me.
Standalone. 20 Hyundai x 220 watts panels, 2 x classic 150's, Latronics 24 volt 3kw inverter, Whiz bang Jnr, 12 Rolls surrete  4KS 25P  batteries and WBJ.
Grid tie feed-in, 12.5 kw in 3 arrays generating 50 kws per day average. Solar river grid tie inverters

bee88man

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Re: Battery banks for grid tie feedin
« Reply #4 on: October 19, 2017, 09:25:52 AM »
Concept is good, substitute the storage to something other than the undurable batteries and you may have a winner...

CDN-VT

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Re: Battery banks for grid tie feedin
« Reply #5 on: October 19, 2017, 11:29:12 PM »
Water wheel or turbine ..
Solar here  is iffy in the winter on the WET COAST

VT
Canadian Solar 350W 37.6 VOC  30.6 VMP 8.22 ISC 7.87 IMP ,-15 c +30c max  4 strings in 2 in Series for 24v Classic 150 -1020 Ah  Freezers & fridges ~~~ Second Array same panels of 3sx3 parallel for 24 V Classic 150 -440 Ah Outback Barns & out blds.
48Vdc almost done.

ClassicCrazy

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Re: Battery banks for grid tie feedin
« Reply #6 on: October 19, 2017, 11:35:25 PM »
Simple storage - pump the water up on top of a mountain and then use the water and pressure  to run a turbine at night and get the good rate.
Nothing to it eh ?

Larry
system one
Classic 150 , 5s4p  Kyocera 135watt , 12s Soneil 2v 540amp lead crystal for 24v pack , Outback 3524 inverter
system two
Classic 150 ,5s 135 watt Kyocero , 16s Calb 100AH LiFePO4 , Outback VFX 3648 inverter
system three
Midnite KID MPPT 24 DC in to  12 volt AGM batterie

russ_drinkwater

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Re: Battery banks for grid tie feedin
« Reply #7 on: October 21, 2017, 06:22:25 AM »
We have a 30,000 gravity feed water tank to the houses but the flow would be intermittent at best.
The gold standard would be a 5kw wind turbine running to grid feed, but the ones I have seen are
less reliable than solar and have a lower output.
I will bite the bullet and ring him to see the the hard sell costs are for a laugh.
Standalone. 20 Hyundai x 220 watts panels, 2 x classic 150's, Latronics 24 volt 3kw inverter, Whiz bang Jnr, 12 Rolls surrete  4KS 25P  batteries and WBJ.
Grid tie feed-in, 12.5 kw in 3 arrays generating 50 kws per day average. Solar river grid tie inverters

mike90045

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Re: Battery banks for grid tie feedin
« Reply #8 on: October 29, 2017, 08:26:48 PM »
Seems like you would have to have a very large battery bank. And if you were drawing it down like to 50% or more than that  you would certainly decrease the longevity  of your battery life. So not sure if it would be worth the extra $$ you make selling power back compared to how much batteries cost.

Larry

works good for the folks selling batteries, but your electricity savings will not likely be enough to buy a new bank
http://tinyurl.com/LMR-Solar

Classic 200| 2Kw PV, 160Voc | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph )| Listeroid 6/1, st5 gen head | XW6048 inverter/chgr | midnight ePanel & 4 SPDs | 48V, 800A NiFe battery bank | MS-TS-MPPT60 w/3Kw PV

russ_drinkwater

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Re: Battery banks for grid tie feedin
« Reply #9 on: October 30, 2017, 04:24:11 PM »
Yes there is always a gain for the seller.
On the other hand Latronics here in australia make a small hybrid grid tie inverter.
It is 48 volt which is one of the lower end fire up voltage inverters.
It is only 1.1kw, but you can connect a 48 volt battery system into it and
it will charge the batteries and then feed the rest of the solar input into the grid system.
When the solar input drops off below power production levels the inverter will draw from the battery bank and continue
to grid feed. Once the battery voltage drops to 48 volts the inverter will shutdown feed until the morning sun
starts the solar cycle again.
I have bought a few of these for pennies ($200 posted) and they work a treat.
Have not yet tried the battery charge/feed in system yet.
Standalone. 20 Hyundai x 220 watts panels, 2 x classic 150's, Latronics 24 volt 3kw inverter, Whiz bang Jnr, 12 Rolls surrete  4KS 25P  batteries and WBJ.
Grid tie feed-in, 12.5 kw in 3 arrays generating 50 kws per day average. Solar river grid tie inverters