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Old 08-16-2016, 11:04 AM   #1
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House Batteries on 3150S

I love my 3150S but with all the boon docking we do, I have to recharge the batteries too often. Anyone else have issue holding a charge in this rig? We pretty much just have a fan running on low and the the fridge?

I'm thinking of adding two more batteries (either 2 6V or 2 12V). I'm pretty sure I can put them in one of the external compartments near the side door (or under the sofa) but I was wondering if anyone has done this?

Lastly, any thoughts which charges the batteries better: Generator or Engine?

Thanks,
Greg
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Old 08-16-2016, 11:25 AM   #2
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My Forester 2701ds uses .4 amps with nothing on. The fridge raises it to 1.2 amps and with fan on low up to 2.4 amps. My amp draw dry camping is usually 60-80 amps per day. I have 2 group 27 batteries.
I just added solar and it's great. Gets it charged back up without much generator use if at all.
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Old 08-16-2016, 11:47 AM   #3
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Thanks.. How are you verifying your amperage draw?
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Old 08-16-2016, 11:57 AM   #4
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Quote:
Originally Posted by grega View Post
Lastly, any thoughts which charges the batteries better: Generator or Engine?

Thanks,
Greg
RV House Battery: How to keep it charged
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Old 08-16-2016, 12:11 PM   #5
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Thanks.. How are you verifying your amperage draw?
Xantrex battery monitor
Regarding the alternator vs generator, I think the generator will give you the best recharge. The alternator and generator current are regulated for all the batteries (engine and house) by the BIM (battery Isolation Manager) that is located in your step well. Note that on some models, the BIM will allow the Converter charger powered by shoreline or generator to charge the engine battery and also will only allow the alternator to charge the house batteries for 1 hour at a time unless the volts drop below a level. You may want to read the BIM manufacturer's data on the web for more accurate info on what's being charged and when.
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Old 08-16-2016, 12:50 PM   #6
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My Forester 2701ds uses .4 amps with nothing on. The fridge raises it to 1.2 amps and with fan on low up to 2.4 amps. My amp draw dry camping is usually 60-80 amps per day. I have 2 group 27 batteries.
I just added solar and it's great. Gets it charged back up without much generator use if at all.
How much solar did you add?
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Old 08-16-2016, 12:55 PM   #7
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How much solar did you add?
2 Renogy 100 watt panels on the roof and I have a Renogy 100 watt suitcase (portable), 300 watts total and 16 amps.
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Old 08-16-2016, 02:48 PM   #8
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I had one heck of a power drain on my Berkshire, when in storage, with with all the switches turned off, and the battery disconnects turned to off. I put 2 Renogy 150 watt solar panels (=300 watts) and get 17.2 amps sun power recharging the batteries. Since putting in the solar panels, my batteries stay charged!
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Old 08-16-2016, 05:09 PM   #9
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Not a good idea to continually recharge hose batteries front engine alternator. Engine alternators are designed to top off auto battery after charging. Continual recharging house battery with engine alternator will quickly burn up you auto alternator. This comes from experirnce.
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