Quick battery question

[Derlyn]

See attached simple circuit.

Will battery B in any way be effected by the load that is connected across battery A ?

[Dylboy]

I don't think so as the charge controller would keep it balanced as far as I know.

If it's Lead Acid then I assume the charge controller will still help with the balancing and charging etc.

If anything battery A would dictate the charge of the battery bank and then battery B would be in balance with A.

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[GCE]

Depends on the size of the load vs sizing of the battery vs size of Pv panels and whether the load will be drawn in solar hours or outside of solar hours.

Battery A will work harder but keep being balanced or attempted to be balanced out by Battery B depending on load .

Not an ideal situation and I would not attempt to install for a client - I might do for myself understanding that the battery life could be shortened

[Derlyn]

Thanks for that.

No, not for a client ... my own spot.

I have a 24V inverter connected accross both batteries. Inverter is connected to the DB through a changeover switch, much the same as a genny.
At the same time, the house has 12V lighting (40Watts) connected across battery A.

During blackouts at night, more often than not, we don't even switch on the inverter.
Only use the lights. One switch turns them all on. Battery operated wifi. No need for TV. Fridges and freezers can easily go for 6 hours or more without power, no problem.

Have not installed solar for any clients and do not intend to. Too much to go wrong.
Also, residential clients always expect too much from solar and as our friend says " that's when the fight starts "

Was just wondering if it's necessary to alternate the lights connection between the 2 batteries.

Sometimes even without a blackout, we use the 12V lighting.

The batteries are 110 AH FLA batteries.

[Isetech]

What about balancing the load across the 2 batteries, instead of connecting to only one battery, connect (split) half the load to battery 1 and the other half to battery 2. That way the battery stay balanced. It will mean a little extra wire and time, but considering it is for yourself, no extra cost

[Isetech]

Dont forget to fit fuses. I made a little oops the other day, man this DC burns quickly.

[Derlyn]

What about balancing the load across the 2 batteries, instead of connecting to only one battery, connect (split) half the load to battery 1 and the other half to battery 2. That way the battery stay balanced. It will mean a little extra wire and time, but considering it is for yourself, no extra cost

Nah! Too much work now. Fortunately my wife don't read this forum otherwise I would have been ordered to do it.

[AndyD]

It will cause the batteries to become unbalanced which will shorten lifespan.

Fit a 24-12v DC-DC converter. for a 20 Amp version it's about R850.00

[Derlyn]

It will cause the batteries to become unbalanced which will shorten lifespan.

Fit a 24-12v DC-DC converter. for a 20 Amp version it's about R850.00

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Thanks Andy. That sounds like a plan. Appreciated Brother.

[Justloadit]

Just a note,
when there are batteries in series, and the charger says - Balance, and there is no individual battery connection to the charger, then it is not a balanced charger. It relies on the terminal voltage to assume some form of control. Any individual battery voltage change, changes the over all series voltage value, and the charger acts on this. This i one of the reasons, that lead acid batteries do what they do when they fail, one has a high voltage the other a low voltage - usually happens when one of the internal cells fail.

Don't know what current you need, but using a SMPS is the most efficient way to do what you need.
See here DC-DC CONVERTER BUCK-BOOST I=4-32 O=1.2-35V 3A, a couple of wires and set your output voltage and you good to go.

[Dylboy]

Kicking my self that I didn't think of the DC -DC thing... briallint idea

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