What have I done wrong?

[ducksface]

Originally Posted by Beau388

It is the amount of lead in a lead acid battery that gives it rating nothing else. It doesn't matter if it is a 2 volt cell, two 2 volt cells, three 2 volt cells, four 2 volt cells, etc. The chemistry is the same. Now are better design batteries for specific uses, yes. A starting battery is meant for starting a vehicle. A deep cycle battery is meant for golf cart use (or an electric vehicle). A combination battery will work in both applications, but not as well as a battery made fro that specific purpose. 6 and 8 volt deep cycle batteries are the cheapest because the make up 40% of the deep cycle market as they are supplies to golf carts. Textron (E Z GO) buys over 2 hundred thousand GC-8 and 1 hundred thousand CG-2 batteries a year. Thor MC plant 750 (Thor's largest vehicle plant) buys approximately 4.500 group 27 12 volt combination batteries a year.

Go to the Trojan battery site and compare the weight of 12 volt batteries and 6 volt batteries. IE 12 volt group 27 Trojan is listed at 115 a-h at 61 lbs. A GC-2 (T-105) is rated at 225 a-h at 62 lbs. So 2 GC-2 weigh 124 lbs (1.81 a-h per lb)and 2 group 27 weigh 122 lbs (1.88 a-h per lb.) So actually the group 27 batteries have slightly more a-h per pound of battery.

Let me counter all of that with the one simple truth that supports all 6v arguments:
'my dad said his 1954 Hupmobile....'

[lwmcguire]

Originally Posted by lp1957

Thanks EDENSOB. That's exactly where I'm at. Everything is working except charging. Does not seem to be charging from any source (shore power, engine alternator or external battery charger) Thought maybe there might be a breaker needing reset. Thanks to all

Might have fried your trombetta or whatever brand you have solenoid, check it out

[lwmcguire]

For anyone wanting to quickly check the specs, here you go

Also if you truly want to go 12v you need to get into a battery like Lifeline and spend some serious money to gain anything over the 6v series connections

[Glensouth]

The resettable fuse on your converter may be tripped.

[Bob Denman]

Originally Posted by lp1957

Problem is solved. All that was needed was an overnight charge AND reset inverter display. Thanks to all for your suggestions and advice.

Glad to see that you're back up and running!

[lwmcguire]

Here are the data sheets I used to make my decision yv versus 12v

As you can see I gained amp hours which I needed for boondocking

Originally Posted by Beau388

It is the amount of lead in a lead acid battery that gives it rating nothing else. It doesn't matter if it is a 2 volt cell, two 2 volt cells, three 2 volt cells, four 2 volt cells, etc. The chemistry is the same. Now are better design batteries for specific uses, yes. A starting battery is meant for starting a vehicle. A deep cycle battery is meant for golf cart use (or an electric vehicle). A combination battery will work in both applications, but not as well as a battery made fro that specific purpose. 6 and 8 volt deep cycle batteries are the cheapest because the make up 40% of the deep cycle market as they are supplies to golf carts. Textron (E Z GO) buys over 2 hundred thousand GC-8 and 1 hundred thousand CG-2 batteries a year. Thor MC plant 750 (Thor's largest vehicle plant) buys approximately 4.500 group 27 12 volt combination batteries a year.

Go to the Trojan battery site and compare the weight of 12 volt batteries and 6 volt batteries. IE 12 volt group 27 Trojan is listed at 115 a-h at 61 lbs. A GC-2 (T-105) is rated at 225 a-h at 62 lbs. So 2 GC-2 weigh 124 lbs (1.81 a-h per lb)and 2 group 27 weigh 122 lbs (1.88 a-h per lb.) So actually the group 27 batteries have slightly more a-h per pound of battery but the CG-2s are slightly cheaper on the Internet.

I do agree that AGM batteries are generally better than flooded especially for starting batteries, but unless you consider the life cycle cost, flooded batteries are a better value. Actually I find combination batteries fill all my needs for house batteries (group 29).

T105-AGM_Reliant_DS_Final.pdf27AGM_Trojan_Data_Sheets.pdf

[Beau388]

Originally Posted by lwmcguire

Here are the data sheets I used to make my decision yv versus 12v

As you can see I gained amp hours which I needed for boondocking



Attachment 25919Attachment 25920

You are comparing different Trojan battery lines. There is the one for the signature line. That I used for comparison. <https://www.trojanbattery.com/products/deep-cycle-flooded/signature-line-flooded-2/> The amp-hours for 2 6 volts vs 2 12 volts look the same to me. Trojan batteries are as good as the come in flooded, AGM and gel, but they are not cost effective unless you plan to keep the coach for 5 years or more, IMHO.

[lwmcguire]

Well I think we agree

The reason i decided to change my 4 house batteries before they actually failed was the corrosion

We pull them down hard over night and recharge with the generator at around 110 amps

Using the flooded hard resulted in significant corrosion in the battery bay and cables

That combined with no water or cables to clean was the deciding factor