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Old 01-07-2017, 09:36 AM   #1
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Wet Cell and AGM

Ok I have for yrs. been with the understanding that you should not combine Wet Cell batteries and AGM in parallel circuits and when using chargers. I need to replace my chassis battery on my Dolphin it is currently a wet cell and my house is 2 6v deep cycle batteries and will too need to be replace them probably in the spring. Can I buy a AGM for my chassis starting battery and keep my wet cells for my house? Is it ok for the onboard charger and the rare occasion of needing to combine them when needed for emergency starting if they are different type of batteries?


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Old 01-07-2017, 11:33 AM   #2
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Wet Cell and AGM

Well after doing some research all my thoughts were the case. It is not advisable and the alternator and charger are probably designed for wet cells and to not mix. My biggest concern was about the charging not so much the possible need to use the combiner.


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Old 01-07-2017, 12:21 PM   #3
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Ok I have for yrs. been with the understanding that you should not combine Wet Cell batteries and AGM in parallel circuits and when using chargers. I need to replace my chassis battery on my Dolphin it is currently a wet cell and my house is 2 6v deep cycle batteries and will too need to be replace them probably in the spring. Can I buy a AGM for my chassis starting battery and keep my wet cells for my house? Is it ok for the onboard charger and the rare occasion of needing to combine them when needed for emergency starting if they are different type of batteries?


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Generally the inverter charger allows you to select the type of battery you want charged from the inverter side. The vehicle alternator should not care. However, if your system has a battery combiner for use with the inverter side I believe mixing battery types could create a problem. The way AGM battery is charged is different than a flooded battery. I considered a similar arrangement but came to the conclusion it best to have all batteries flooded or AGM and not mix and match. However, I found no evidence having house one type and the chassis another created a safety issue but would most likely shorten the life of one or both battery banks.
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Old 01-07-2017, 04:20 PM   #4
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Generally the inverter charger allows you to select the type of battery you want charged from the inverter side. The vehicle alternator should not care. However, if your system has a battery combiner for use with the inverter side I believe mixing battery types could create a problem. The way AGM battery is charged is different than a flooded battery. I considered a similar arrangement but came to the conclusion it best to have all batteries flooded or AGM and not mix and match. However, I found no evidence having house one type and the chassis another created a safety issue but would most likely shorten the life of one or both battery banks.

Yep just just bought another wet cell for the chassis. I do think my inverter charger does have that selection as you say.
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Old 01-07-2017, 04:32 PM   #5
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My starting batteries are low maintenance wet cells, the house batteries were AGM's. The inverter charged all of them and was set for AGM's.
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Old 01-08-2017, 11:41 AM   #6
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My setup is the same as Deans ... wet cell starter batteries, AGM house batteries. Inverter/Charger set for AGM. Chassis battery charge is maintained by the alternator or by the Echo charger.
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Old 01-09-2017, 07:16 PM   #7
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The charging profile is near identical for wet cell GC2 batteries and Fullriver AGM batteries.
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