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Old 02-15-2020, 05:08 PM   #1
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First journey

I could use a bit of advice on deep cell batteries. My class a has just 1(new).I know it's not enough for boondocking,but how many do I need? How long to recharge charge them? Can they be run down below 50% charge ?are solar chargers worth the expense?
Any help greatly appreciated! Charlie
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Old 02-15-2020, 05:56 PM   #2
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Welcome to the forum Charlie,

Before we can answer this question we need to know a little more about the converter (battery charger) in your motorhome. Your converter must be able to charge at 14.4V or possibly more to quick charge your battery. Tell us the brand on your converter and we can help advise you on that.

In addition, how long do you intend to be parked at any particular spot? What do you intend to run off of the battery(ies), and for how long between charges?

I suspect that one 12V battery won't get you far. I have 2 golf cart 6V batteries. I can watch TV all evening and run my furnace all night with 2 hours generator time in the morning and 2 hours in the evening to recharge the batteries for another night.

More information will get better answers. You might add a signature to your profile with more information on your RV. What chassis? What engine? What transmission? Do you tow anything? Etc.
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Old 02-20-2020, 10:17 AM   #3
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Consider buying a Victron Energy BMV-712 and see how much power you are using. It uses a shunt connected between the negative terminal on your battery bank and the negative cable. It show the real time current flow in or out of your battery bank.

It uses this information to calculate the state of charge of your battery in terms of percentage. Its like fuel gage for your battery.

It is also useful to determine how much each device contributes to the load. You can use bluetooth and an app on your phone and look at the real time current flow. Walk around your motorhome and turn each device and see how much additional DC current is being used.

When charging you can monitor the current flow into your batteries and the estimated time to reaching 100% state of charge.

This device will help you decide how many useable amp-hours of battery you need to support your class A motorhome between charging cycles. You can charge your house batteries by alternator when driving, running generator, plugging in to campground power or solar.
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Old 02-22-2020, 03:23 AM   #4
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As to whether solar chargers are worth the expense, it depends. Where do you camp? In the dessert? Absolutely. In the deep woods, under the trees? Not so much.
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