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Old 01-01-2021, 04:59 PM   #1
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2014 Interstate Ext. Coach
Bennington , New Hampshire
Join Date: Dec 2015
Posts: 75
DIY 12V 200AH Lithium Battery pack

Pictures of a 200AH Lithium battery pack, which fits neatly into the existing ABS tray of AI models with the battery steel box under the rear seat. This unit weighs in at <>47 lbs (less than of AGM/LA), will easily double the OEM battery capacity and with proper care have a cycle life >8000. Leaving the OEM 1000W Magnum in place (as inverter only), there is no need to change any of the wiring making for a relatively easy installation.

Battery can easily be removed for winter storage in temperatures at or below single digits. Storage above those temps, discharge and charge can be disabled with a switch, respectively temp sensor, hence removal is not necessary.

Charging is done with the addition of a dedicated 60A CC/CV charger operating on shore power or generator (charge time <3 hrs.) Solar supply of 250 300W is ideal to top battery SOC under normal use and with all day sun. Alternator charging needs equipment change if used. Some other accessories may be necessary.

With basic understanding of electricity and good mechanical aptitude, a system like this is relatively easy to build and install and will greatly enhance the ability to camp in (nice) spots w/o shore power.
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Old 01-01-2021, 05:55 PM   #2
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2012 Avenue Coach
Corpus Christi , Texas
Join Date: Feb 2018
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Quote:
Originally Posted by Sailfast View Post
Pictures of a 200AH Lithium battery pack, which fits neatly into the existing ABS tray of AI models with the battery steel box under the rear seat. This unit weighs in at <>47 lbs (less than of AGM/LA), will easily double the OEM battery capacity and with proper care have a cycle life >8000. Leaving the OEM 1000W Magnum in place (as inverter only), there is no need to change any of the wiring making for a relatively easy installation.

Battery can easily be removed for winter storage in temperatures at or below single digits. Storage above those temps, discharge and charge can be disabled with a switch, respectively temp sensor, hence removal is not necessary.

Charging is done with the addition of a dedicated 60A CC/CV charger operating on shore power or generator (charge time <3 hrs.) Solar supply of 250 – 300W is ideal to top battery SOC under normal use and with all day sun. Alternator charging needs equipment change if used. Some other accessories may be necessary.

With basic understanding of electricity and good mechanical aptitude, a system like this is relatively easy to build and install and will greatly enhance the ability to camp in (nice) spots w/o shore power.

Nice additional capacity (always good), but how will you make your battery pack weather-proof if outside, and how will you deal with low temperatures?
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Old 01-02-2021, 08:12 AM   #3
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2014 Interstate Ext. Coach
Bennington , New Hampshire
Join Date: Dec 2015
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Originally Posted by rowiebowie View Post
Nice additional capacity (always good), but how will you make your battery pack weather-proof if outside, and how will you deal with low temperatures?
The battery is not outside, it is a replacement which fits and slides into the metal box under the rear seat. Low temperatures; in the second picture you see a wire hanging down, at the end is a temperature sensor with a charge cutoff at around 0 degrees C. Discharge in low temperature is possible, however use or storage below -20 C not recommended. I'll install a discharge cutoff switch on the outside of the metal box, mostly for storage use. However, the battery will be removed for temperatures below 10 degrees F, or I contemplate installation of a 60W heating pad on a thermostat.
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Old 01-02-2021, 08:23 PM   #4
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1994 28' Excella
Hood River , Oregon
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Nice work. Love the Spectra rope carrying handles.


All the best,
Hein
DIYvan
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Old 01-02-2021, 08:39 PM   #5
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Corpus Christi , Texas
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Originally Posted by Sailfast View Post
The battery is not outside, it is a replacement which fits and slides into the metal box under the rear seat. Low temperatures; in the second picture you see a wire hanging down, at the end is a temperature sensor with a charge cutoff at around 0 degrees C. Discharge in low temperature is possible, however use or storage below -20 C not recommended. I'll install a discharge cutoff switch on the outside of the metal box, mostly for storage use. However, the battery will be removed for temperatures below 10 degrees F, or I contemplate installation of a 60W heating pad on a thermostat.

Good move placing the batteries inside and using a BMS with low-temperature cutoff. I moved my Renogy 2 x 100Ah batteries inside and repurposed their old location for storage of leveling blocks for no net loss of space (a premium in class b's) and where I live freezing is not a problem. Sounds like your heating pad is a very good solution when in storage.
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