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Old 09-25-2013, 11:31 PM   #11
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Les,

Yes, the charger I purchased is for both maintaining and desulphating any 12v battery. This is the one:

BatteryMINDer Onboard Battery Charger/Maintainer - 12 Volt, Model# 12151 - Amazon.com

At 1.5 amps, it could overcharge the battery if left on too long, except that it's also a smart charger that knows when the battery has reached full voltage and tapers the charge off to prevent overcharging. The Amazon reviews of the product were also very helpful in learning how it works. Hope that helps clarify.

At any rate, it seems the consensus is to flip off the battery disconnect while desulphating to prevent any converter issues or damage, so that's how we're gonna play it. Thanks, all!
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Old 09-30-2013, 04:30 PM   #12
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does anyone know the size of the converter and inverter used in the Crusader 290rlt?
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Old 10-01-2013, 06:46 AM   #13
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And in a 2 battery (parallel) configuration, hook up the Battery Minder/Tender to charge both batteries simultaneously?
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Old 10-01-2013, 08:07 AM   #14
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Quote:
Originally Posted by wlhpas View Post
does anyone know the size of the converter and inverter used in the Crusader 290rlt?
I would think you might be able to find this info either in your manuals, or in an online spec sheet, or your dealer (admittedly, not likely.) Sounds like a new thread!

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Originally Posted by Monterra View Post
And in a 2 battery (parallel) configuration, hook up the Battery Minder/Tender to charge both batteries simultaneously?
That's a good question! Sounds like a call or email to Battery Tender's customer service to see what happens if their device is hooked up to 2 batteries in parallel--or maybe an answer from Lou?
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Old 10-01-2013, 11:21 AM   #15
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Quote:
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And in a 2 battery (parallel) configuration, hook up the Battery Minder/Tender to charge both batteries simultaneously?
Monterra, the short answer is "yes".

Long answer: Batteries connected in parallel (positive to positive, negative to negative) are seen by the charger as "one" large battery of the combined amp-hour capacity of both batteries (Voltage stays the same while capacity increases). A properly sized charger will charge both simultaneously.

It is important you make sure that both batteries are the same size (same amp-hour capacity) and age. Since they will act as one when in parallel, they will try to balance out if different sizes/condition. One may be overcharged and the other undercharged.
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Old 10-01-2013, 03:52 PM   #16
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Triguy, what would you consider a 'properly sized' charger for 2 - 12 v batteries in parallel. They are new Interstate 'combo' batteries (RV/Marine - 550 CCA).

Also, does anyone have a recommendation for a desulphator. I was going to get a Battery Tender but that unit does not have desulphating capability.
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Old 10-01-2013, 04:12 PM   #17
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Triguy, what would you consider a 'properly sized' charger for 2 - 12 v batteries in parallel. They are new Interstate 'combo' batteries (RV/Marine - 550 CCA).

Also, does anyone have a recommendation for a desulphator. I was going to get a Battery Tender but that unit does not have desulphating capability.
See my Amazon link at the top of the page--that is a 1.5A charger from Battery Minder that DOES desulphate.
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Old 10-01-2013, 04:54 PM   #18
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Triguy, what would you consider a 'properly sized' charger for 2 - 12 v batteries in parallel. They are new Interstate 'combo' batteries (RV/Marine - 550 CCA).
For chargers other than BatteryMINDer...

Can you provide the 20-hr amp rate (if possible)? This rate might not be available since these are marine batteries. Just FYI, but the CCA number won't help here as CCA is a measure of how well the battery can start an engine in the cold but not a useful measure for our needs in powering a camper. You need the 20-hr amp rate or, at least, the reserve capacity.

Basically, with the 20-hr rate, there are a number of ratios put out there by different companies. Usually, they will say something like "flooded batteries can accept a charge rate of between 10-13% of capacity (Trojan says this).

Interstate says "up to 10% of capacity" (source). Capacity is the 20-hr rate so if you only can find the RC, than Interstate has a rough formula for turning that number into the 20-hr rate. For example, an Interstate battery with the part number MT-34 has 120 minutes reserve capacity. In order to calculate the amount of amp-hours in a battery, the rule of thumb method is to multiply the reserve capacity by 0.6. In the case of a MT-34, 120 minutes reserve capacity multiplied by 0.6 = approximately 72 amp-hours (at the 20-hour rate).

BatteryMINDer is different in that their chargers are 8amps or less. If you get a batteryMINDer than I suggest that you call them.

I hope that helps you. I know its not a direct answer, but its all I got.
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