Magnum Energy ME-RC Settings with Outback 2700RE 24V

Discussion about the OutBack Energy Cell Batteries
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LyssaMarieM
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Joined: Mon Jun 24, 2019 8:56 am

Magnum Energy ME-RC Settings with Outback 2700RE 24V

Post by LyssaMarieM » Fri Sep 20, 2019 10:57 am

First of all, hello to everyone! I am new here, having just purchases an 100% off-grid home that was set up by the previous owner with the following:
  • Magna-Sine 4000 Watt Sine Wave Inverter with Charger
  • Magnum ME-RC50 remote panel
  • Magnum Auto-Gen Start (configured through the ME-RC)
  • SunExtender 2v 915AH batteries (24v configuration) - Upgrading today to Outback 2700RE
  • Xantrex XW Solar Charge Controllers (2 charge controllers) managing 12 solar panels (6 215W and 6 236W set ups)
We are very much learning as we go. With taking delivery of new batteries today, we cannot afford to make a mistake with ME-RC settings as it relates to battery charging and discharging rates.

We are upgrading (today) to Outback 2700RE batteries in a 24V configuration, so QTY 12 2V batteries.

My question:
I have to configure my ME-RC for the proper settings for the new 2700RE batteries. Specifically, the settings for the:
  • Low Battery Cut-out setting that should be used to set the DC voltage level that turns off the inverter to protect the batteries from over-discharge damage (in the event my AGS fails and my generator does not kick on)
  • What is the lowest voltage setting that the batteries should be permitted to drop to before the AGS triggers the generator?
  • Absorb time charging required if my solar panels cannot produce (in winter, typically) enough power to fully charge the batteries. I think this is 390 minutes, the max allowed by my inverter
  • Float charging voltage I should configure. I believe this should be set at 27.00V based on the temperature in my basement being a constant 65 degrees
  • Is there a recommended bulk (or absorption voltage) charge setting?. I am thinking this would be the initial Charge Voltage which is 2.27V per cell or 27.24 overall
Anything else I need to consider when using the ME-RC to manage my new Outback batteries? We will eventually upgrade to the Outback Inveter but its not in the budget at this time.

Thank you everyone for your guidance!

raysun
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Posts: 1011
Joined: Tue Jul 26, 2016 5:57 am
My RE system: Flexpower One: FX3048T, (2) FM80, MATE3s, FlexNetDC
Outback 200NC batteries (8 @ 48v)
Outback IBR3 battery enclosure
Suniva 330 watt panels (12 - 6 Strings @ 2 Series)
Hyundai 355 watt panels (6 - 3 strings @ 2 series)

Re: Magnum Energy ME-RC Settings with Outback 2700RE 24V

Post by raysun » Fri Sep 20, 2019 12:02 pm

I'm sure you have the docs on the monoblocks, but here's a link if you need them:
https://www.wholesalesolar.com/9890062/ ... ttery-bank

If the system supports it, temperature compenstated charging should be used. The ambient (air) temperature and battery temperature aren't necessarily the same, especially during charging. Be cautious to minimize any overcharging of a VRLA battery, as it can lead to permanent capacity loss and shortened service life.

LyssaMarieM
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Posts: 2
Joined: Mon Jun 24, 2019 8:56 am

Re: Magnum Energy ME-RC Settings with Outback 2700RE 24V

Post by LyssaMarieM » Sun Sep 22, 2019 2:36 pm

Thanks raysun!

I do have the manuals and, if I were using the Outback Controller it would be much easier for the inverter settings.

We do not yet have a temperature management set up, but our controller supports it. Will need to place this at the top of the list of upgrades for sure.

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