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Old February 5th, 2014, 10:14 AM   #1
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Default Charge controllers and Battery types

Last fall my uncle and I set up a solar power/battery bank system at the family camp. The set up is a 140 watt panel ( i believe 140, could be a bit more), 2 group 31 batteries, and a 30 amp MPPT charge controller.

This spring/summer we are going to be adding a second panel and two batteries. I picked up 3 exide group 31 gel batteries that are going to be used. the other two are just sealed lead acid

My question is, can the charge controller be used with two different type batteries? One of the current batts is for my uncles boat so it will be the 3 gels and one SLA. I can't find anything online about using a charge controller with different types of batteries. The controller lets you change what battery type, but is it ok to use it with 2 different types? I know that chemically they are basically the same. Just wanted to ask someone who knows more than me

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Old February 7th, 2014, 10:05 AM   #2
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No one has experience with solar systems????
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Old March 4th, 2014, 08:28 PM   #3
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a friend of mine has been ''off the grid'' for 12 or so years now and has a pretty nice 2kw home solar panel set up, I ll ask him tomorrow about it-Dave

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Old March 5th, 2014, 05:03 PM   #4
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from my buddy, DONT mix battery types, you will have a "weakest link" in that the batteries need to be closely matched to charge and discharge safely and efficiently, same to a lesser extent for the panels too, he says your best bet would be to ad a 4th gel battery and another 140w panel
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Old March 7th, 2014, 08:57 AM   #5
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Quote:
Originally Posted by broncobuddha View Post
from my buddy, DONT mix battery types, you will have a "weakest link" in that the batteries need to be closely matched to charge and discharge safely and efficiently, same to a lesser extent for the panels too, he says your best bet would be to ad a 4th gel battery and another 140w panel
Thanks, I appreciate the help

We were going to be adding another panel anyway, so i'l pick up another gel battery
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Old March 7th, 2014, 07:28 PM   #6
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no problem, I want a similar setup for power outages at home, 2 240 w panels with 4 t 105 Trojans will run the lights and tv and laptop for a long time
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