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Old 01-15-2020, 01:21 PM   #21
john61ct
 
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Default Re: Renogy Gel Battery

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Originally Posted by EvanS View Post
You could also get an isotemp water heater and hook it up like Hein and I have. Free hot water.
So confused.

Do they make something for off grid use? What is the energy source?

I thought they only make units fed off AC power, so you'd need to run the genset to take showers.
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Old 01-15-2020, 01:22 PM   #22
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Default Re: Renogy Gel Battery

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So confused.

Do they make something for off grid use? What is the energy source?

I thought they only make units fed off AC power, so you'd need to run the genset to take showers.
You use engine coolant. When you drive it heats up the water. Look for heins write up.
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Old 01-15-2020, 02:35 PM   #23
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Default Re: Renogy Gel Battery

So you just mean not a heater, just the tank / calorifier / heat exchanger part of it.

Not much use for those camping days and weeks off grid without driving.
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Old 01-15-2020, 03:23 PM   #24
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Default Re: Renogy Gel Battery

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So you just mean not a heater, just the tank / calorifier / heat exchanger part of it.

Not much use for those camping days and weeks off grid without driving.
Do you have a lot of experience doing that? We live in the van so max time spent not driving is a weekend or so. Water stays hot for 24 hours in cold climates, longer in moderate.

Also, isotemp has 120 volt option to heat it too.

I can't tell you what the best option is for your case all I can do is advise what others have done.

If you have to have hot water there is isotemp, your Bosch water heater, Rixen system, solar heated PVC pipe on roof, propane or electrically powered tankless hot water heaters. Go research them and let us know what fits your needs. We can advise from there.
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Old 01-15-2020, 03:57 PM   #25
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Default Re: Renogy Gel Battery

Using a diesel fired coolant heater to heat water is not unusual.

Running electric heaters off solar/battery can be done, but the quantity of water, and the frequency of use will be significantly limited.
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Old 01-18-2020, 09:21 PM   #26
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Default Re: Renogy Gel Battery

I also have the 100 AH Renogy Gel Battery for my 2003 Sprinter under passenger seat install. First one went bad within 4 months and they replaced it. I would normally charge it with a smart battery charger but I was using the AGM 12v setting. Found out later I was supposed to use the normal 12v charge setting. It also charges by alternator when driving. I hope this new one I installed will last longer.
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Old 01-18-2020, 11:30 PM   #27
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Default Re: Renogy Gel Battery

Read my #3 post, slowly in the middle
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Old 01-19-2020, 02:03 PM   #28
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Default Re: Renogy Gel Battery

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Read my #3 post, slowly in the middle
I don't know if I ruined the battery by alternator charging, charging with the AGM setting or a combination of both. The battery itself coulda had a bad cell in at at time of manufacture.
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Old 01-19-2020, 02:13 PM   #29
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Default Re: Renogy Gel Battery

Yes even top quality GEL needs precision charging to get good longevity, very sensitive chemistry.

For robust withstanding of normal abuse, can't beat those FLA GCs above
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Old 01-19-2020, 02:43 PM   #30
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Default Re: Renogy Gel Battery

Typical AGM profiles are too high a voltage for GEL batteries. Gels can also be damaged by high C rate charging, but thats probably not an issue unless you have a pretty big charger. Typical alternator voltages are below 14.2V, and won't be an issue.
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