I currently have a diy lifepo4 pack that I built for my golf cart. It is 48v 210ah and 2p16s. I’m in north Florida and will be getting hit by the hurricane soon. I’d like to use this as a battery back up for my reef aquarium should the power go out. I need to run a 24v dc return pump to the battery. Is it as simple as splitting the pack to 24v and wiring a surge protector to the battery to hook the pump into. Or is there a better way to do this? Thanks for the help!
*Urgent* Battery back up help
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Texas-Mark
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Yes.
chess-equality
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In the Victron book, on page 23 it describes how you can achieve this with a DC/DC converter.
Texas-Mark
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Not sure the OPer has time to be ordering parts. For what he needs simply splitting them into 24v packs will work fine. He can even parallel those then too.
May need a 24v BMS. Consider a small 48v inverter.
https://www.donrowe.com/Inverters-48-VDC-Input-s/1970.htm
+1 for a Victron or other 48-24 DC converter.
Need to find a local supplier. s/b some boat or RV shops around.
https://www.donrowe.com/Inverters-48-VDC-Input-s/1970.htm
+1 for a Victron or other 48-24 DC converter.
Need to find a local supplier. s/b some boat or RV shops around.
Correct. I don’t believe I will have time to get an inverter in. Thanks for the help!
sunshine_eggo
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No. You will not have an active BMS UNLESS you connect to only the half of the battery with your leads connected where indicated.
You will still have BMS protection in the above scenario. If that half of the battery goes dead, you can swap the 8S group to the left with the 8S group to the right and use the other half of the battery.
Note that anything you do outside even load on 16S is going to create horrific imbalance and likely require a top balance.
Texas-Mark
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The BMS "might" be an issue. He did not indicate how it is set up. But in an emergency, I would just ditch the BMS. The battery is not going to be charged in a power outage. And depending on the pump draw, it could last for days before running into a low cell voltage issue.
No. If the pack is reconfigured to 24v the power will be used direct.
I think I would have to ditch the bms and parallel the battery pack to 24v to keep them from coming unbalanced. I could always top balance later on if needed. The pump will not be drawing much amperage so I would just keep test the cells with a voltage meter as much as I could.
sunshine_eggo
Happy Breffast!
The BMS that fails 100% of the time is the DIY-Human-BMS®
HighDesertOffgrid
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1. A reef aquarium during a major disaster is far from urgent unless you plan to eat from it.
2. Gilligan sometimes gives sound advice to the professor. Just sayin'.
2. Gilligan sometimes gives sound advice to the professor. Just sayin'.
Texas-Mark
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Who said he was in the main path? Lots of people had power outages with no other damage.
In any case, I hope the OPer is ok.
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