Simpliphi batteries in float applications

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Mike Curran
Forum Emperor
Posts: 1217
Joined: Sat Aug 28, 2004 6:28 pm
My RE system: Outback - Garage roof:
- 8 (2x4) Evergreen 180's into one MX60 (2007)
- 6 (2×3) ALEO S79-300's into one FM80 (2017)
- 2 grid-tied GVFX3524's classic stacked for 120/240VAC (2007)
- 12 Surrette/Rolls 2V x 1766Ah (2007)
- Hub10.3, Mate3s, FNDC, RTS, OpticsRE. Tigo Energy ES maximizers on each PV module.

Westinghouse Solar - Barn roof: (2012)
- 30 (2x15) 235W panels with Enphase M215 microinverters, grid-tied.

Outback Skybox - Barn roof: (2019)
- 14 (2x7) Talesun 275W
- 2 SimpliPhi 3.8 batteries, 48V, 150Ah total
- future AC coupled input from both rows of Westinghouse AC modules*
- future AC coupled input from 14 Talesun 275W, Enphase M215 modules*
* waiting for firmware update from OB

All self-designed and self-installed
Location: Chagrin Falls, Ohio

Simpliphi batteries in float applications

Post by Mike Curran » Wed Nov 27, 2019 7:17 pm

I have recently seen comments on the forum saying that lithium batteries are not suitable in float/backup (minimal cycling) applications. These comments concerned me as that is exactly how I planned to use my new Simpliphi batteries. So I emailed Simpliphi Tech support, relating what I'd heard on the forum and asking for their take on this issue.

I received an email response today, as follows:
I wanted to follow up a voicemail I left in regards to the questions you had with our batteries and your Outback Skybox. Our batteries are absolutely recommended and capable for your application. Please be sure to follow our Outback Integration guide (attached). Additional resources can be found on our website here: https://simpliphipower.com/product-documentation/ .

Some key items to note are:

Each battery is recommended to not exceed a c/2 discharge or charge. This would be 1.9 kw per battery or 3.8 kw for your 2x PHI 3.8 batteries. Each battery can charge and discharge at 37.5 A. The voltage range to stay within for your battery bank is as low as 50.2V up to 54V (floating at 54V is considered a full charge).

Be sure that you stay within those operating parameters and your batteries should work well with your Outback equipment.
In the voicemail he referenced, their rep specifically said the forum comments are not true for their batteries. Again, he emphasized making sure I follow their recommended settings for my battery.

If anyone can offer a more authoritative opinion on this subject, please share! Thanks - Mike
http://www.tigoenergy.com/site.php?95b2dca2-ca6c
https://enlighten.enphaseenergy.com/public/systems/Hctc107221

sodamo
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My RE system: Totally off grid - Hamakua side, Big Island, Hi
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Re: Simpliphi batteries in float applications

Post by sodamo » Thu Nov 28, 2019 1:12 am

Mike, wondering who might be “more authoritative”.
David
Please visit http://vacation.ninolehawaii.com

Mike Curran
Forum Emperor
Posts: 1217
Joined: Sat Aug 28, 2004 6:28 pm
My RE system: Outback - Garage roof:
- 8 (2x4) Evergreen 180's into one MX60 (2007)
- 6 (2×3) ALEO S79-300's into one FM80 (2017)
- 2 grid-tied GVFX3524's classic stacked for 120/240VAC (2007)
- 12 Surrette/Rolls 2V x 1766Ah (2007)
- Hub10.3, Mate3s, FNDC, RTS, OpticsRE. Tigo Energy ES maximizers on each PV module.

Westinghouse Solar - Barn roof: (2012)
- 30 (2x15) 235W panels with Enphase M215 microinverters, grid-tied.

Outback Skybox - Barn roof: (2019)
- 14 (2x7) Talesun 275W
- 2 SimpliPhi 3.8 batteries, 48V, 150Ah total
- future AC coupled input from both rows of Westinghouse AC modules*
- future AC coupled input from 14 Talesun 275W, Enphase M215 modules*
* waiting for firmware update from OB

All self-designed and self-installed
Location: Chagrin Falls, Ohio

Re: Simpliphi batteries in float applications

Post by Mike Curran » Thu Nov 28, 2019 5:15 am

Well, I have to admit, maybe the manufacturer isn't the best source for negative aspects of their product.

I will say that Nissan says their Leaf battery life is reduced by keeping it at full charge all the time, like if you kept it plugged into your home charger all the time. But my Leaf is a 2014 model so maybe newer batteries are better. Or maybe they have a different chemistry than Simpliphi.

Also, lithium batteries don't have a lot of history so only time will tell for sure. Keeping my fingers crossed :neutral:
http://www.tigoenergy.com/site.php?95b2dca2-ca6c
https://enlighten.enphaseenergy.com/public/systems/Hctc107221

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