Charging 12 volt Battery Bank

[Sunking]

Would someone explain what C/8 and C/12 with C/10 means.

c is the Amp Hour rating of the battery and the number 8, 10, 12 are hours. So if you charge a 100 AH battery at the C/10 rate 100 AH / 10 H = 10 Amps. Simple 5th grade math. AH / H = A

[SunEagle]

Thanks for the information and suggestions everyone.
Would someone explain what C/8 and C/12 with C/10 means.
Also I haven't heard anything about chemical Reconditioners yet. Getting one more year out of my batteries would be nice if at all possible.

I wouldn't invest a lot of money on battery reconditioners. You might want to look into first reducing your daily load so the batteries last a little longer as well as researching a new battery system.

[Rodney123]

Old batteries

I wouldn't invest a lot of money on battery reconditioners. You might want to look into first reducing your daily load so the batteries last a little longer as well as researching a new battery system.

I think your right. Thank you very much.

[inetdog]

c is the Amp Hour rating of the battery and the number 8, 10, 12 are hours. So if you charge a 100 AH battery at the C/10 rate 100 AH / 10 H = 10 Amps. Simple 5th grade math. AH / H = A

It is actually a little more complicated than that when folks are being casual about typing and printing (as is common on this forum). You need to understand what they might mean instead.

The 20 hour capacity is represented in good typography as C₂₀ or occasionally C(20). For the typographically challenged it is sometimes written as C20 or just plain C.

Once you get past that, a number before the C or after the C with a "/" in between should only be used for a rate which is based on whichever C rate you are using for reference. So, as you said, C/10 would be the (twenty hour) C rate divided by ten, and would be a current in amps. And 4C would also be a current in amps which is four times the (twenty hour) C rate.

But some folks write C/20 when they really mean C₂₀, so look carefully at the context.

PS: It is relatively easy to enter subscripts and superscripts when composing a post, just use the x₂ or x² buttons in the formatting bar. If only it were as easy to get ohm and degree symbols. <sigh>

[Rodney123]

He better get rid of those two 12volt inverter and buy a 48 volt 3000watts pure shine wave inverter and rewire the batteries to 3 strings 48 volts bank, he only need to use ONE 60 amps MPPT charge controller to charge those batteries. life would be much easier.

I now have 5 strings of 4 - 6 volt batteries (t-105 new) with a 24 volt 5000 watt pure sine wave inverter and 3 - 24 volt 60 amp mppt's with 48 - 75 watt siemens solar panels. My question is, Is it possible to hook up my 2 - 12 volt battery chargers ( 50 amp each) for back-up, to charge a 24 volt system? Or will I have to buy new chargers too.
If you see any other problems with this set-up, Please let me know.
Thank you.
HELP!

[Mike90250]

....... My question is, Is it possible to hook up my 2 - 12 volt battery chargers ( 50 amp) for back-up, to charge a 24 volt system? Or will I have to buy new chargers too......

Most likely, yes.

It is possible, if the charger output is completely isolated, to hook up as you describe. You can use 2 isolation transformers, if the chargers are not isolated.

You will know if they are not isolated because a dead short will occur when you hook them up. Along with sparks and flames. If you are really lucky, it happens when you first connect. Unlucky - it happens 10 minutes later, after you walk away and the meager insulation slowly fries.